Merge pull request #252 from Arceliar/refactoring

Refactoring

misc/genkeys.go

@@ -12,11 +12,16 @@ This only matters if it's high enough to make you the root of the tree.
 */
 package main
 
-import "encoding/hex"
+import (
-import "flag"
+	"encoding/hex"
-import "fmt"
+	"flag"
-import "runtime"
+	"fmt"
-import . "github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
+	"net"
+	"runtime"
+
+	"github.com/yggdrasil-network/yggdrasil-go/src/address"
+	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
+)
 
 var doSig = flag.Bool("sig", false, "generate new signing keys instead")
 
@@ -82,12 +87,7 @@ func isBetter(oldID, newID []byte) bool {
 }
 
 func doBoxKeys(out chan<- keySet, in <-chan []byte) {
-	c := Core{}
+	var bestID crypto.NodeID
-	pub, _ := c.DEBUG_newBoxKeys()
-	bestID := c.DEBUG_getNodeID(pub)
-	for idx := range bestID {
-		bestID[idx] = 0
-	}
 	for {
 		select {
 		case newBestID := <-in:
@@ -95,22 +95,20 @@ func doBoxKeys(out chan<- keySet, in <-chan []byte) {
 				copy(bestID[:], newBestID)
 			}
 		default:
-			pub, priv := c.DEBUG_newBoxKeys()
+			pub, priv := crypto.NewBoxKeys()
-			id := c.DEBUG_getNodeID(pub)
+			id := crypto.GetNodeID(pub)
 			if !isBetter(bestID[:], id[:]) {
 				continue
 			}
-			bestID = id
+			bestID = *id
-			ip := c.DEBUG_addrForNodeID(id)
+			ip := net.IP(address.AddrForNodeID(id)[:]).String()
 			out <- keySet{priv[:], pub[:], id[:], ip}
 		}
 	}
 }
 
 func doSigKeys(out chan<- keySet, in <-chan []byte) {
-	c := Core{}
+	var bestID crypto.TreeID
-	pub, _ := c.DEBUG_newSigKeys()
-	bestID := c.DEBUG_getTreeID(pub)
 	for idx := range bestID {
 		bestID[idx] = 0
 	}
@@ -122,12 +120,12 @@ func doSigKeys(out chan<- keySet, in <-chan []byte) {
 			}
 		default:
 		}
-		pub, priv := c.DEBUG_newSigKeys()
+		pub, priv := crypto.NewSigKeys()
-		id := c.DEBUG_getTreeID(pub)
+		id := crypto.GetTreeID(pub)
 		if !isBetter(bestID[:], id[:]) {
 			continue
 		}
-		bestID = id
+		bestID = *id
 		out <- keySet{priv[:], pub[:], id[:], ""}
 	}
 }

src/address/address.go

@@ -1,21 +1,26 @@
-package yggdrasil
+package address
+
+import "github.com/yggdrasil-network/yggdrasil-go/src/crypto"
 
 // address represents an IPv6 address in the yggdrasil address range.
-type address [16]byte
+type Address [16]byte
 
 // subnet represents an IPv6 /64 subnet in the yggdrasil subnet range.
-type subnet [8]byte
+type Subnet [8]byte
 
 // address_prefix is the prefix used for all addresses and subnets in the network.
 // The current implementation requires this to be a muliple of 8 bits + 7 bits.
 // The 8th bit of the last byte is used to signal nodes (0) or /64 prefixes (1).
 // Nodes that configure this differently will be unable to communicate with eachother, though routing and the DHT machinery *should* still work.
-var address_prefix = [...]byte{0x02}
+func GetPrefix() [1]byte {
+	return [...]byte{0x02}
+}
 
 // isValid returns true if an address falls within the range used by nodes in the network.
-func (a *address) isValid() bool {
+func (a *Address) IsValid() bool {
-	for idx := range address_prefix {
+	prefix := GetPrefix()
-		if (*a)[idx] != address_prefix[idx] {
+	for idx := range prefix {
+		if (*a)[idx] != prefix[idx] {
 			return false
 		}
 	}
@@ -23,28 +28,29 @@ func (a *address) isValid() bool {
 }
 
 // isValid returns true if a prefix falls within the range usable by the network.
-func (s *subnet) isValid() bool {
+func (s *Subnet) IsValid() bool {
-	l := len(address_prefix)
+	prefix := GetPrefix()
-	for idx := range address_prefix[:l-1] {
+	l := len(prefix)
-		if (*s)[idx] != address_prefix[idx] {
+	for idx := range prefix[:l-1] {
+		if (*s)[idx] != prefix[idx] {
 			return false
 		}
 	}
-	return (*s)[l-1] == address_prefix[l-1]|0x01
+	return (*s)[l-1] == prefix[l-1]|0x01
 }
 
 // address_addrForNodeID takes a *NodeID as an argument and returns an *address.
 // This subnet begins with the address prefix, with the last bit set to 0 to indicate an address.
 // The following 8 bits are set to the number of leading 1 bits in the NodeID.
 // The NodeID, excluding the leading 1 bits and the first leading 0 bit, is truncated to the appropriate length and makes up the remainder of the address.
-func address_addrForNodeID(nid *NodeID) *address {
+func AddrForNodeID(nid *crypto.NodeID) *Address {
 	// 128 bit address
 	// Begins with prefix
 	// Next bit is a 0
 	// Next 7 bits, interpreted as a uint, are # of leading 1s in the NodeID
 	// Leading 1s and first leading 0 of the NodeID are truncated off
 	// The rest is appended to the IPv6 address (truncated to 128 bits total)
-	var addr address
+	var addr Address
 	var temp []byte
 	done := false
 	ones := byte(0)
@@ -67,9 +73,10 @@ func address_addrForNodeID(nid *NodeID) *address {
 			temp = append(temp, bits)
 		}
 	}
-	copy(addr[:], address_prefix[:])
+	prefix := GetPrefix()
-	addr[len(address_prefix)] = ones
+	copy(addr[:], prefix[:])
-	copy(addr[len(address_prefix)+1:], temp)
+	addr[len(prefix)] = ones
+	copy(addr[len(prefix)+1:], temp)
 	return &addr
 }
 
@@ -77,14 +84,15 @@ func address_addrForNodeID(nid *NodeID) *address {
 // This subnet begins with the address prefix, with the last bit set to 1 to indicate a prefix.
 // The following 8 bits are set to the number of leading 1 bits in the NodeID.
 // The NodeID, excluding the leading 1 bits and the first leading 0 bit, is truncated to the appropriate length and makes up the remainder of the subnet.
-func address_subnetForNodeID(nid *NodeID) *subnet {
+func SubnetForNodeID(nid *crypto.NodeID) *Subnet {
 	// Exactly as the address version, with two exceptions:
 	//  1) The first bit after the fixed prefix is a 1 instead of a 0
 	//  2) It's truncated to a subnet prefix length instead of 128 bits
-	addr := *address_addrForNodeID(nid)
+	addr := *AddrForNodeID(nid)
-	var snet subnet
+	var snet Subnet
 	copy(snet[:], addr[:])
-	snet[len(address_prefix)-1] |= 0x01
+	prefix := GetPrefix()
+	snet[len(prefix)-1] |= 0x01
 	return &snet
 }
 
@@ -92,17 +100,18 @@ func address_subnetForNodeID(nid *NodeID) *subnet {
 // The first is a NodeID with all the bits known from the address set to their correct values.
 // The second is a bitmask with 1 bit set for each bit that was known from the address.
 // This is used to look up NodeIDs in the DHT and tell if they match an address.
-func (a *address) getNodeIDandMask() (*NodeID, *NodeID) {
+func (a *Address) GetNodeIDandMask() (*crypto.NodeID, *crypto.NodeID) {
 	// Mask is a bitmask to mark the bits visible from the address
 	// This means truncated leading 1s, first leading 0, and visible part of addr
-	var nid NodeID
+	var nid crypto.NodeID
-	var mask NodeID
+	var mask crypto.NodeID
-	ones := int(a[len(address_prefix)])
+	prefix := GetPrefix()
+	ones := int(a[len(prefix)])
 	for idx := 0; idx < ones; idx++ {
 		nid[idx/8] |= 0x80 >> byte(idx%8)
 	}
 	nidOffset := ones + 1
-	addrOffset := 8*len(address_prefix) + 8
+	addrOffset := 8*len(prefix) + 8
 	for idx := addrOffset; idx < 8*len(a); idx++ {
 		bits := a[idx/8] & (0x80 >> byte(idx%8))
 		bits <<= byte(idx % 8)
@@ -110,7 +119,7 @@ func (a *address) getNodeIDandMask() (*NodeID, *NodeID) {
 		bits >>= byte(nidIdx % 8)
 		nid[nidIdx/8] |= bits
 	}
-	maxMask := 8*(len(a)-len(address_prefix)-1) + ones + 1
+	maxMask := 8*(len(a)-len(prefix)-1) + ones + 1
 	for idx := 0; idx < maxMask; idx++ {
 		mask[idx/8] |= 0x80 >> byte(idx%8)
 	}
@@ -121,16 +130,17 @@ func (a *address) getNodeIDandMask() (*NodeID, *NodeID) {
 // The first is a NodeID with all the bits known from the address set to their correct values.
 // The second is a bitmask with 1 bit set for each bit that was known from the subnet.
 // This is used to look up NodeIDs in the DHT and tell if they match a subnet.
-func (s *subnet) getNodeIDandMask() (*NodeID, *NodeID) {
+func (s *Subnet) GetNodeIDandMask() (*crypto.NodeID, *crypto.NodeID) {
 	// As with the address version, but visible parts of the subnet prefix instead
-	var nid NodeID
+	var nid crypto.NodeID
-	var mask NodeID
+	var mask crypto.NodeID
-	ones := int(s[len(address_prefix)])
+	prefix := GetPrefix()
+	ones := int(s[len(prefix)])
 	for idx := 0; idx < ones; idx++ {
 		nid[idx/8] |= 0x80 >> byte(idx%8)
 	}
 	nidOffset := ones + 1
-	addrOffset := 8*len(address_prefix) + 8
+	addrOffset := 8*len(prefix) + 8
 	for idx := addrOffset; idx < 8*len(s); idx++ {
 		bits := s[idx/8] & (0x80 >> byte(idx%8))
 		bits <<= byte(idx % 8)
@@ -138,7 +148,7 @@ func (s *subnet) getNodeIDandMask() (*NodeID, *NodeID) {
 		bits >>= byte(nidIdx % 8)
 		nid[nidIdx/8] |= bits
 	}
-	maxMask := 8*(len(s)-len(address_prefix)-1) + ones + 1
+	maxMask := 8*(len(s)-len(prefix)-1) + ones + 1
 	for idx := 0; idx < maxMask; idx++ {
 		mask[idx/8] |= 0x80 >> byte(idx%8)
 	}

src/crypto/crypto.go

@@ -0,0 +1,187 @@
+package crypto
+
+/*
+
+This part of the package wraps crypto operations needed elsewhere
+
+In particular, it exposes key generation for ed25519 and nacl box
+
+It also defines NodeID and TreeID as hashes of keys, and wraps hash functions
+
+*/
+
+import (
+	"crypto/rand"
+	"crypto/sha512"
+
+	"golang.org/x/crypto/ed25519"
+	"golang.org/x/crypto/nacl/box"
+
+	"github.com/yggdrasil-network/yggdrasil-go/src/util"
+)
+
+////////////////////////////////////////////////////////////////////////////////
+
+// NodeID and TreeID
+
+const NodeIDLen = sha512.Size
+const TreeIDLen = sha512.Size
+const handleLen = 8
+
+type NodeID [NodeIDLen]byte
+type TreeID [TreeIDLen]byte
+type Handle [handleLen]byte
+
+func GetNodeID(pub *BoxPubKey) *NodeID {
+	h := sha512.Sum512(pub[:])
+	return (*NodeID)(&h)
+}
+
+func GetTreeID(pub *SigPubKey) *TreeID {
+	h := sha512.Sum512(pub[:])
+	return (*TreeID)(&h)
+}
+
+func NewHandle() *Handle {
+	var h Handle
+	_, err := rand.Read(h[:])
+	if err != nil {
+		panic(err)
+	}
+	return &h
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+// Signatures
+
+const SigPubKeyLen = ed25519.PublicKeySize
+const SigPrivKeyLen = ed25519.PrivateKeySize
+const SigLen = ed25519.SignatureSize
+
+type SigPubKey [SigPubKeyLen]byte
+type SigPrivKey [SigPrivKeyLen]byte
+type SigBytes [SigLen]byte
+
+func NewSigKeys() (*SigPubKey, *SigPrivKey) {
+	var pub SigPubKey
+	var priv SigPrivKey
+	pubSlice, privSlice, err := ed25519.GenerateKey(rand.Reader)
+	if err != nil {
+		panic(err)
+	}
+	copy(pub[:], pubSlice)
+	copy(priv[:], privSlice)
+	return &pub, &priv
+}
+
+func Sign(priv *SigPrivKey, msg []byte) *SigBytes {
+	var sig SigBytes
+	sigSlice := ed25519.Sign(priv[:], msg)
+	copy(sig[:], sigSlice)
+	return &sig
+}
+
+func Verify(pub *SigPubKey, msg []byte, sig *SigBytes) bool {
+	// Should sig be an array instead of a slice?...
+	// It's fixed size, but
+	return ed25519.Verify(pub[:], msg, sig[:])
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+// NaCl-like crypto "box" (curve25519+xsalsa20+poly1305)
+
+const BoxPubKeyLen = 32
+const BoxPrivKeyLen = 32
+const BoxSharedKeyLen = 32
+const BoxNonceLen = 24
+const BoxOverhead = box.Overhead
+
+type BoxPubKey [BoxPubKeyLen]byte
+type BoxPrivKey [BoxPrivKeyLen]byte
+type BoxSharedKey [BoxSharedKeyLen]byte
+type BoxNonce [BoxNonceLen]byte
+
+func NewBoxKeys() (*BoxPubKey, *BoxPrivKey) {
+	pubBytes, privBytes, err := box.GenerateKey(rand.Reader)
+	if err != nil {
+		panic(err)
+	}
+	pub := (*BoxPubKey)(pubBytes)
+	priv := (*BoxPrivKey)(privBytes)
+	return pub, priv
+}
+
+func GetSharedKey(myPrivKey *BoxPrivKey,
+	othersPubKey *BoxPubKey) *BoxSharedKey {
+	var shared [BoxSharedKeyLen]byte
+	priv := (*[BoxPrivKeyLen]byte)(myPrivKey)
+	pub := (*[BoxPubKeyLen]byte)(othersPubKey)
+	box.Precompute(&shared, pub, priv)
+	return (*BoxSharedKey)(&shared)
+}
+
+func BoxOpen(shared *BoxSharedKey,
+	boxed []byte,
+	nonce *BoxNonce) ([]byte, bool) {
+	out := util.GetBytes()
+	s := (*[BoxSharedKeyLen]byte)(shared)
+	n := (*[BoxNonceLen]byte)(nonce)
+	unboxed, success := box.OpenAfterPrecomputation(out, boxed, n, s)
+	return unboxed, success
+}
+
+func BoxSeal(shared *BoxSharedKey, unboxed []byte, nonce *BoxNonce) ([]byte, *BoxNonce) {
+	if nonce == nil {
+		nonce = NewBoxNonce()
+	}
+	nonce.Increment()
+	out := util.GetBytes()
+	s := (*[BoxSharedKeyLen]byte)(shared)
+	n := (*[BoxNonceLen]byte)(nonce)
+	boxed := box.SealAfterPrecomputation(out, unboxed, n, s)
+	return boxed, nonce
+}
+
+func NewBoxNonce() *BoxNonce {
+	var nonce BoxNonce
+	_, err := rand.Read(nonce[:])
+	for ; err == nil && nonce[0] == 0xff; _, err = rand.Read(nonce[:]) {
+		// Make sure nonce isn't too high
+		// This is just to make rollover unlikely to happen
+		// Rollover is fine, but it may kill the session and force it to reopen
+	}
+	if err != nil {
+		panic(err)
+	}
+	return &nonce
+}
+
+func (n *BoxNonce) Increment() {
+	oldNonce := *n
+	n[len(n)-1] += 2
+	for i := len(n) - 2; i >= 0; i-- {
+		if n[i+1] < oldNonce[i+1] {
+			n[i] += 1
+		}
+	}
+}
+
+// Used to subtract one nonce from another, staying in the range +- 64.
+// This is used by the nonce progression machinery to advance the bitmask of recently received packets (indexed by nonce), or to check the appropriate bit of the bitmask.
+// It's basically part of the machinery that prevents replays and duplicate packets.
+func (n *BoxNonce) Minus(m *BoxNonce) int64 {
+	diff := int64(0)
+	for idx := range n {
+		diff *= 256
+		diff += int64(n[idx]) - int64(m[idx])
+		if diff > 64 {
+			diff = 64
+		}
+		if diff < -64 {
+			diff = -64
+		}
+	}
+	return diff
+}

src/util/util.go

@@ -1,21 +1,21 @@
-package yggdrasil
+package util
 
 // These are misc. utility functions that didn't really fit anywhere else
 
 import "runtime"
 
 // A wrapper around runtime.Gosched() so it doesn't need to be imported elsewhere.
-func util_yield() {
+func Yield() {
 	runtime.Gosched()
 }
 
 // A wrapper around runtime.LockOSThread() so it doesn't need to be imported elsewhere.
-func util_lockthread() {
+func LockThread() {
 	runtime.LockOSThread()
 }
 
 // A wrapper around runtime.UnlockOSThread() so it doesn't need to be imported elsewhere.
-func util_unlockthread() {
+func UnlockThread() {
 	runtime.UnlockOSThread()
 }
 
@@ -23,15 +23,12 @@ func util_unlockthread() {
 // It's used like a sync.Pool, but with a fixed size and typechecked without type casts to/from interface{} (which were making the profiles look ugly).
 var byteStore chan []byte
 
-// Initializes the byteStore
+func init() {
-func util_initByteStore() {
+	byteStore = make(chan []byte, 32)
-	if byteStore == nil {
-		byteStore = make(chan []byte, 32)
-	}
 }
 
 // Gets an empty slice from the byte store, if one is available, or else returns a new nil slice.
-func util_getBytes() []byte {
+func GetBytes() []byte {
 	select {
 	case bs := <-byteStore:
 		return bs[:0]
@@ -41,7 +38,7 @@ func util_getBytes() []byte {
 }
 
 // Puts a slice in the store, if there's room, or else returns and lets the slice get collected.
-func util_putBytes(bs []byte) {
+func PutBytes(bs []byte) {
 	select {
 	case byteStore <- bs:
 	default:

src/yggdrasil/admin.go

@@ -14,6 +14,8 @@ import (
 	"sync/atomic"
 	"time"
 
+	"github.com/yggdrasil-network/yggdrasil-go/src/address"
+	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
 	"github.com/yggdrasil-network/yggdrasil-go/src/defaults"
 )
 
@@ -314,7 +316,7 @@ func (a *admin) init(c *Core, listenaddr string) {
 					"box_pub_key": hex.EncodeToString(dinfo.key[:]),
 					"coords":      fmt.Sprintf("%v", dinfo.coords),
 				}
-				addr := net.IP(address_addrForNodeID(getNodeID(&dinfo.key))[:]).String()
+				addr := net.IP(address.AddrForNodeID(crypto.GetNodeID(&dinfo.key))[:]).String()
 				infos[addr] = info
 			}
 			return admin_info{"nodes": infos}, nil
@@ -553,7 +555,7 @@ func (a *admin) startTunWithMTU(ifname string, iftapmode bool, ifmtu int) error
 	_ = a.core.router.tun.close()
 	// Then reconfigure and start it
 	addr := a.core.router.addr
-	straddr := fmt.Sprintf("%s/%v", net.IP(addr[:]).String(), 8*len(address_prefix)-1)
+	straddr := fmt.Sprintf("%s/%v", net.IP(addr[:]).String(), 8*len(address.GetPrefix())-1)
 	if ifname != "none" {
 		err := a.core.router.tun.setup(ifname, iftapmode, straddr, ifmtu)
 		if err != nil {
@@ -607,7 +609,7 @@ func (a *admin) getData_getPeers() []admin_nodeInfo {
 	sort.Slice(ps, func(i, j int) bool { return ps[i] < ps[j] })
 	for _, port := range ps {
 		p := ports[port]
-		addr := *address_addrForNodeID(getNodeID(&p.box))
+		addr := *address.AddrForNodeID(crypto.GetNodeID(&p.box))
 		info := admin_nodeInfo{
 			{"ip", net.IP(addr[:]).String()},
 			{"port", port},
@@ -632,7 +634,7 @@ func (a *admin) getData_getSwitchPeers() []admin_nodeInfo {
 		if !isIn {
 			continue
 		}
-		addr := *address_addrForNodeID(getNodeID(&peer.box))
+		addr := *address.AddrForNodeID(crypto.GetNodeID(&peer.box))
 		coords := elem.locator.getCoords()
 		info := admin_nodeInfo{
 			{"ip", net.IP(addr[:]).String()},
@@ -690,7 +692,7 @@ func (a *admin) getData_getDHT() []admin_nodeInfo {
 			return dht_ordered(&a.core.dht.nodeID, dhtInfos[i].getNodeID(), dhtInfos[j].getNodeID())
 		})
 		for _, v := range dhtInfos {
-			addr := *address_addrForNodeID(v.getNodeID())
+			addr := *address.AddrForNodeID(v.getNodeID())
 			info := admin_nodeInfo{
 				{"ip", net.IP(addr[:]).String()},
 				{"coords", fmt.Sprint(v.coords)},
@@ -740,7 +742,7 @@ func (a *admin) getAllowedEncryptionPublicKeys() []string {
 func (a *admin) addAllowedEncryptionPublicKey(bstr string) (err error) {
 	boxBytes, err := hex.DecodeString(bstr)
 	if err == nil {
-		var box boxPubKey
+		var box crypto.BoxPubKey
 		copy(box[:], boxBytes)
 		a.core.peers.addAllowedEncryptionPublicKey(&box)
 	}
@@ -752,7 +754,7 @@ func (a *admin) addAllowedEncryptionPublicKey(bstr string) (err error) {
 func (a *admin) removeAllowedEncryptionPublicKey(bstr string) (err error) {
 	boxBytes, err := hex.DecodeString(bstr)
 	if err == nil {
-		var box boxPubKey
+		var box crypto.BoxPubKey
 		copy(box[:], boxBytes)
 		a.core.peers.removeAllowedEncryptionPublicKey(&box)
 	}
@@ -761,7 +763,7 @@ func (a *admin) removeAllowedEncryptionPublicKey(bstr string) (err error) {
 
 // Send a DHT ping to the node with the provided key and coords, optionally looking up the specified target NodeID.
 func (a *admin) admin_dhtPing(keyString, coordString, targetString string) (dhtRes, error) {
-	var key boxPubKey
+	var key crypto.BoxPubKey
 	if keyBytes, err := hex.DecodeString(keyString); err != nil {
 		return dhtRes{}, err
 	} else {
@@ -792,7 +794,7 @@ func (a *admin) admin_dhtPing(keyString, coordString, targetString string) (dhtR
 	} else if len(targetBytes) != len(target) {
 		return dhtRes{}, errors.New("Incorrect target NodeID length")
 	} else {
-		target = NodeID{}
+		var target crypto.NodeID
 		copy(target[:], targetBytes)
 	}
 	rq := dhtReqKey{info.key, target}
@@ -818,7 +820,7 @@ func (a *admin) admin_dhtPing(keyString, coordString, targetString string) (dhtR
 }
 
 func (a *admin) admin_getNodeInfo(keyString, coordString string, nocache bool) (nodeinfoPayload, error) {
-	var key boxPubKey
+	var key crypto.BoxPubKey
 	if keyBytes, err := hex.DecodeString(keyString); err != nil {
 		return nodeinfoPayload{}, err
 	} else {

src/yggdrasil/ckr.go

@@ -7,6 +7,9 @@ import (
 	"fmt"
 	"net"
 	"sort"
+
+	"github.com/yggdrasil-network/yggdrasil-go/src/address"
+	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
 )
 
 // This module implements crypto-key routing, similar to Wireguard, where we
@@ -17,15 +20,15 @@ type cryptokey struct {
 	enabled     bool
 	ipv4routes  []cryptokey_route
 	ipv6routes  []cryptokey_route
-	ipv4cache   map[address]cryptokey_route
+	ipv4cache   map[address.Address]cryptokey_route
-	ipv6cache   map[address]cryptokey_route
+	ipv6cache   map[address.Address]cryptokey_route
 	ipv4sources []net.IPNet
 	ipv6sources []net.IPNet
 }
 
 type cryptokey_route struct {
 	subnet      net.IPNet
-	destination boxPubKey
+	destination crypto.BoxPubKey
 }
 
 // Initialise crypto-key routing. This must be done before any other CKR calls.
@@ -33,8 +36,8 @@ func (c *cryptokey) init(core *Core) {
 	c.core = core
 	c.ipv4routes = make([]cryptokey_route, 0)
 	c.ipv6routes = make([]cryptokey_route, 0)
-	c.ipv4cache = make(map[address]cryptokey_route, 0)
+	c.ipv4cache = make(map[address.Address]cryptokey_route, 0)
-	c.ipv6cache = make(map[address]cryptokey_route, 0)
+	c.ipv6cache = make(map[address.Address]cryptokey_route, 0)
 	c.ipv4sources = make([]net.IPNet, 0)
 	c.ipv6sources = make([]net.IPNet, 0)
 }
@@ -52,7 +55,7 @@ func (c *cryptokey) isEnabled() bool {
 // Check whether the given address (with the address length specified in bytes)
 // matches either the current node's address, the node's routed subnet or the
 // list of subnets specified in IPv4Sources/IPv6Sources.
-func (c *cryptokey) isValidSource(addr address, addrlen int) bool {
+func (c *cryptokey) isValidSource(addr address.Address, addrlen int) bool {
 	ip := net.IP(addr[:addrlen])
 
 	if addrlen == net.IPv6len {
@@ -143,7 +146,7 @@ func (c *cryptokey) addRoute(cidr string, dest string) error {
 
 	// Build our references to the routing table and cache
 	var routingtable *[]cryptokey_route
-	var routingcache *map[address]cryptokey_route
+	var routingcache *map[address.Address]cryptokey_route
 
 	// Check if the prefix is IPv4 or IPv6
 	if prefixsize == net.IPv6len*8 {
@@ -157,11 +160,11 @@ func (c *cryptokey) addRoute(cidr string, dest string) error {
 	}
 
 	// Is the route an Yggdrasil destination?
-	var addr address
+	var addr address.Address
-	var snet subnet
+	var snet address.Subnet
 	copy(addr[:], ipaddr)
 	copy(snet[:], ipnet.IP)
-	if addr.isValid() || snet.isValid() {
+	if addr.IsValid() || snet.IsValid() {
 		return errors.New("Can't specify Yggdrasil destination as crypto-key route")
 	}
 	// Do we already have a route for this subnet?
@@ -173,11 +176,11 @@ func (c *cryptokey) addRoute(cidr string, dest string) error {
 	// Decode the public key
 	if bpk, err := hex.DecodeString(dest); err != nil {
 		return err
-	} else if len(bpk) != boxPubKeyLen {
+	} else if len(bpk) != crypto.BoxPubKeyLen {
 		return errors.New(fmt.Sprintf("Incorrect key length for %s", dest))
 	} else {
 		// Add the new crypto-key route
-		var key boxPubKey
+		var key crypto.BoxPubKey
 		copy(key[:], bpk)
 		*routingtable = append(*routingtable, cryptokey_route{
 			subnet:      *ipnet,
@@ -205,16 +208,16 @@ func (c *cryptokey) addRoute(cidr string, dest string) error {
 // Looks up the most specific route for the given address (with the address
 // length specified in bytes) from the crypto-key routing table. An error is
 // returned if the address is not suitable or no route was found.
-func (c *cryptokey) getPublicKeyForAddress(addr address, addrlen int) (boxPubKey, error) {
+func (c *cryptokey) getPublicKeyForAddress(addr address.Address, addrlen int) (crypto.BoxPubKey, error) {
 	// Check if the address is a valid Yggdrasil address - if so it
 	// is exempt from all CKR checking
-	if addr.isValid() {
+	if addr.IsValid() {
-		return boxPubKey{}, errors.New("Cannot look up CKR for Yggdrasil addresses")
+		return crypto.BoxPubKey{}, errors.New("Cannot look up CKR for Yggdrasil addresses")
 	}
 
 	// Build our references to the routing table and cache
 	var routingtable *[]cryptokey_route
-	var routingcache *map[address]cryptokey_route
+	var routingcache *map[address.Address]cryptokey_route
 
 	// Check if the prefix is IPv4 or IPv6
 	if addrlen == net.IPv6len {
@@ -224,7 +227,7 @@ func (c *cryptokey) getPublicKeyForAddress(addr address, addrlen int) (boxPubKey
 		routingtable = &c.ipv4routes
 		routingcache = &c.ipv4cache
 	} else {
-		return boxPubKey{}, errors.New("Unexpected prefix size")
+		return crypto.BoxPubKey{}, errors.New("Unexpected prefix size")
 	}
 
 	// Check if there's a cache entry for this addr
@@ -260,7 +263,7 @@ func (c *cryptokey) getPublicKeyForAddress(addr address, addrlen int) (boxPubKey
 	}
 
 	// No route was found if we got to this point
-	return boxPubKey{}, errors.New(fmt.Sprintf("No route to %s", ip.String()))
+	return crypto.BoxPubKey{}, errors.New(fmt.Sprintf("No route to %s", ip.String()))
 }
 
 // Removes a source subnet, which allows traffic with these source addresses to
@@ -312,7 +315,7 @@ func (c *cryptokey) removeRoute(cidr string, dest string) error {
 
 	// Build our references to the routing table and cache
 	var routingtable *[]cryptokey_route
-	var routingcache *map[address]cryptokey_route
+	var routingcache *map[address.Address]cryptokey_route
 
 	// Check if the prefix is IPv4 or IPv6
 	if prefixsize == net.IPv6len*8 {
@@ -329,7 +332,7 @@ func (c *cryptokey) removeRoute(cidr string, dest string) error {
 	bpk, err := hex.DecodeString(dest)
 	if err != nil {
 		return err
-	} else if len(bpk) != boxPubKeyLen {
+	} else if len(bpk) != crypto.BoxPubKeyLen {
 		return errors.New(fmt.Sprintf("Incorrect key length for %s", dest))
 	}
 	netStr := ipnet.String()

src/yggdrasil/core.go

@@ -8,7 +8,9 @@ import (
 	"net"
 	"regexp"
 
+	"github.com/yggdrasil-network/yggdrasil-go/src/address"
 	"github.com/yggdrasil-network/yggdrasil-go/src/config"
+	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
 	"github.com/yggdrasil-network/yggdrasil-go/src/defaults"
 )
 
@@ -19,10 +21,10 @@ var buildVersion string
 // object for each Yggdrasil node you plan to run.
 type Core struct {
 	// This is the main data structure that holds everything else for a node
-	boxPub      boxPubKey
+	boxPub      crypto.BoxPubKey
-	boxPriv     boxPrivKey
+	boxPriv     crypto.BoxPrivKey
-	sigPub      sigPubKey
+	sigPub      crypto.SigPubKey
-	sigPriv     sigPrivKey
+	sigPriv     crypto.SigPrivKey
 	switchTable switchTable
 	peers       peers
 	sessions    sessions
@@ -37,15 +39,14 @@ type Core struct {
 	ifceExpr    []*regexp.Regexp // the zone of link-local IPv6 peers must match this
 }
 
-func (c *Core) init(bpub *boxPubKey,
+func (c *Core) init(bpub *crypto.BoxPubKey,
-	bpriv *boxPrivKey,
+	bpriv *crypto.BoxPrivKey,
-	spub *sigPubKey,
+	spub *crypto.SigPubKey,
-	spriv *sigPrivKey) {
+	spriv *crypto.SigPrivKey) {
 	// TODO separate init and start functions
 	//  Init sets up structs
 	//  Start launches goroutines that depend on structs being set up
 	// This is pretty much required to completely avoid race conditions
-	util_initByteStore()
 	if c.log == nil {
 		c.log = log.New(ioutil.Discard, "", 0)
 	}
@@ -95,10 +96,10 @@ func (c *Core) Start(nc *config.NodeConfig, log *log.Logger) error {
 
 	c.log.Println("Starting up...")
 
-	var boxPub boxPubKey
+	var boxPub crypto.BoxPubKey
-	var boxPriv boxPrivKey
+	var boxPriv crypto.BoxPrivKey
-	var sigPub sigPubKey
+	var sigPub crypto.SigPubKey
-	var sigPriv sigPrivKey
+	var sigPriv crypto.SigPrivKey
 	boxPubHex, err := hex.DecodeString(nc.EncryptionPublicKey)
 	if err != nil {
 		return err
@@ -190,7 +191,7 @@ func (c *Core) Start(nc *config.NodeConfig, log *log.Logger) error {
 	}
 
 	ip := net.IP(c.router.addr[:]).String()
-	if err := c.router.tun.start(nc.IfName, nc.IfTAPMode, fmt.Sprintf("%s/%d", ip, 8*len(address_prefix)-1), nc.IfMTU); err != nil {
+	if err := c.router.tun.start(nc.IfName, nc.IfTAPMode, fmt.Sprintf("%s/%d", ip, 8*len(address.GetPrefix())-1), nc.IfMTU); err != nil {
 		c.log.Println("Failed to start TUN/TAP")
 		return err
 	}
@@ -208,35 +209,35 @@ func (c *Core) Stop() {
 
 // Generates a new encryption keypair. The encryption keys are used to
 // encrypt traffic and to derive the IPv6 address/subnet of the node.
-func (c *Core) NewEncryptionKeys() (*boxPubKey, *boxPrivKey) {
+func (c *Core) NewEncryptionKeys() (*crypto.BoxPubKey, *crypto.BoxPrivKey) {
-	return newBoxKeys()
+	return crypto.NewBoxKeys()
 }
 
 // Generates a new signing keypair. The signing keys are used to derive the
 // structure of the spanning tree.
-func (c *Core) NewSigningKeys() (*sigPubKey, *sigPrivKey) {
+func (c *Core) NewSigningKeys() (*crypto.SigPubKey, *crypto.SigPrivKey) {
-	return newSigKeys()
+	return crypto.NewSigKeys()
 }
 
 // Gets the node ID.
-func (c *Core) GetNodeID() *NodeID {
+func (c *Core) GetNodeID() *crypto.NodeID {
-	return getNodeID(&c.boxPub)
+	return crypto.GetNodeID(&c.boxPub)
 }
 
 // Gets the tree ID.
-func (c *Core) GetTreeID() *TreeID {
+func (c *Core) GetTreeID() *crypto.TreeID {
-	return getTreeID(&c.sigPub)
+	return crypto.GetTreeID(&c.sigPub)
 }
 
 // Gets the IPv6 address of the Yggdrasil node. This is always a /128.
 func (c *Core) GetAddress() *net.IP {
-	address := net.IP(address_addrForNodeID(c.GetNodeID())[:])
+	address := net.IP(address.AddrForNodeID(c.GetNodeID())[:])
 	return &address
 }
 
 // Gets the routed IPv6 subnet of the Yggdrasil node. This is always a /64.
 func (c *Core) GetSubnet() *net.IPNet {
-	subnet := address_subnetForNodeID(c.GetNodeID())[:]
+	subnet := address.SubnetForNodeID(c.GetNodeID())[:]
 	subnet = append(subnet, 0, 0, 0, 0, 0, 0, 0, 0)
 	return &net.IPNet{IP: subnet, Mask: net.CIDRMask(64, 128)}
 }

src/yggdrasil/crypto.go

@@ -1,167 +0,0 @@
-package yggdrasil
-
-/*
-
-This part of the package wraps crypto operations needed elsewhere
-
-In particular, it exposes key generation for ed25519 and nacl box
-
-It also defines NodeID and TreeID as hashes of keys, and wraps hash functions
-
-*/
-
-import (
-	"crypto/rand"
-	"crypto/sha512"
-
-	"golang.org/x/crypto/ed25519"
-	"golang.org/x/crypto/nacl/box"
-)
-
-////////////////////////////////////////////////////////////////////////////////
-
-// NodeID and TreeID
-
-const NodeIDLen = sha512.Size
-const TreeIDLen = sha512.Size
-const handleLen = 8
-
-type NodeID [NodeIDLen]byte
-type TreeID [TreeIDLen]byte
-type handle [handleLen]byte
-
-func getNodeID(pub *boxPubKey) *NodeID {
-	h := sha512.Sum512(pub[:])
-	return (*NodeID)(&h)
-}
-
-func getTreeID(pub *sigPubKey) *TreeID {
-	h := sha512.Sum512(pub[:])
-	return (*TreeID)(&h)
-}
-
-func newHandle() *handle {
-	var h handle
-	_, err := rand.Read(h[:])
-	if err != nil {
-		panic(err)
-	}
-	return &h
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-// Signatures
-
-const sigPubKeyLen = ed25519.PublicKeySize
-const sigPrivKeyLen = ed25519.PrivateKeySize
-const sigLen = ed25519.SignatureSize
-
-type sigPubKey [sigPubKeyLen]byte
-type sigPrivKey [sigPrivKeyLen]byte
-type sigBytes [sigLen]byte
-
-func newSigKeys() (*sigPubKey, *sigPrivKey) {
-	var pub sigPubKey
-	var priv sigPrivKey
-	pubSlice, privSlice, err := ed25519.GenerateKey(rand.Reader)
-	if err != nil {
-		panic(err)
-	}
-	copy(pub[:], pubSlice)
-	copy(priv[:], privSlice)
-	return &pub, &priv
-}
-
-func sign(priv *sigPrivKey, msg []byte) *sigBytes {
-	var sig sigBytes
-	sigSlice := ed25519.Sign(priv[:], msg)
-	copy(sig[:], sigSlice)
-	return &sig
-}
-
-func verify(pub *sigPubKey, msg []byte, sig *sigBytes) bool {
-	// Should sig be an array instead of a slice?...
-	// It's fixed size, but
-	return ed25519.Verify(pub[:], msg, sig[:])
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-// NaCl-like crypto "box" (curve25519+xsalsa20+poly1305)
-
-const boxPubKeyLen = 32
-const boxPrivKeyLen = 32
-const boxSharedKeyLen = 32
-const boxNonceLen = 24
-const boxOverhead = box.Overhead
-
-type boxPubKey [boxPubKeyLen]byte
-type boxPrivKey [boxPrivKeyLen]byte
-type boxSharedKey [boxSharedKeyLen]byte
-type boxNonce [boxNonceLen]byte
-
-func newBoxKeys() (*boxPubKey, *boxPrivKey) {
-	pubBytes, privBytes, err := box.GenerateKey(rand.Reader)
-	if err != nil {
-		panic(err)
-	}
-	pub := (*boxPubKey)(pubBytes)
-	priv := (*boxPrivKey)(privBytes)
-	return pub, priv
-}
-
-func getSharedKey(myPrivKey *boxPrivKey,
-	othersPubKey *boxPubKey) *boxSharedKey {
-	var shared [boxSharedKeyLen]byte
-	priv := (*[boxPrivKeyLen]byte)(myPrivKey)
-	pub := (*[boxPubKeyLen]byte)(othersPubKey)
-	box.Precompute(&shared, pub, priv)
-	return (*boxSharedKey)(&shared)
-}
-
-func boxOpen(shared *boxSharedKey,
-	boxed []byte,
-	nonce *boxNonce) ([]byte, bool) {
-	out := util_getBytes()
-	s := (*[boxSharedKeyLen]byte)(shared)
-	n := (*[boxNonceLen]byte)(nonce)
-	unboxed, success := box.OpenAfterPrecomputation(out, boxed, n, s)
-	return unboxed, success
-}
-
-func boxSeal(shared *boxSharedKey, unboxed []byte, nonce *boxNonce) ([]byte, *boxNonce) {
-	if nonce == nil {
-		nonce = newBoxNonce()
-	}
-	nonce.update()
-	out := util_getBytes()
-	s := (*[boxSharedKeyLen]byte)(shared)
-	n := (*[boxNonceLen]byte)(nonce)
-	boxed := box.SealAfterPrecomputation(out, unboxed, n, s)
-	return boxed, nonce
-}
-
-func newBoxNonce() *boxNonce {
-	var nonce boxNonce
-	_, err := rand.Read(nonce[:])
-	for ; err == nil && nonce[0] == 0xff; _, err = rand.Read(nonce[:]) {
-		// Make sure nonce isn't too high
-		// This is just to make rollover unlikely to happen
-		// Rollover is fine, but it may kill the session and force it to reopen
-	}
-	if err != nil {
-		panic(err)
-	}
-	return &nonce
-}
-
-func (n *boxNonce) update() {
-	oldNonce := *n
-	n[len(n)-1] += 2
-	for i := len(n) - 2; i >= 0; i-- {
-		if n[i+1] < oldNonce[i+1] {
-			n[i] += 1
-		}
-	}
-}

src/yggdrasil/debug.go

@@ -22,6 +22,8 @@ import "net/http"
 import "runtime"
 import "os"
 
+import "github.com/yggdrasil-network/yggdrasil-go/src/address"
+import "github.com/yggdrasil-network/yggdrasil-go/src/crypto"
 import "github.com/yggdrasil-network/yggdrasil-go/src/defaults"
 
 // Start the profiler in debug builds, if the required environment variable is set.
@@ -48,8 +50,8 @@ func StartProfiler(log *log.Logger) error {
 // This function is only called by the simulator to set up a node with random
 // keys. It should not be used and may be removed in the future.
 func (c *Core) Init() {
-	bpub, bpriv := newBoxKeys()
+	bpub, bpriv := crypto.NewBoxKeys()
-	spub, spriv := newSigKeys()
+	spub, spriv := crypto.NewSigKeys()
 	c.init(bpub, bpriv, spub, spriv)
 	c.switchTable.start()
 	c.router.start()
@@ -59,12 +61,12 @@ func (c *Core) Init() {
 
 // Core
 
-func (c *Core) DEBUG_getSigningPublicKey() sigPubKey {
+func (c *Core) DEBUG_getSigningPublicKey() crypto.SigPubKey {
-	return (sigPubKey)(c.sigPub)
+	return (crypto.SigPubKey)(c.sigPub)
 }
 
-func (c *Core) DEBUG_getEncryptionPublicKey() boxPubKey {
+func (c *Core) DEBUG_getEncryptionPublicKey() crypto.BoxPubKey {
-	return (boxPubKey)(c.boxPub)
+	return (crypto.BoxPubKey)(c.boxPub)
 }
 
 func (c *Core) DEBUG_getSend() chan<- []byte {
@@ -81,7 +83,7 @@ func (c *Core) DEBUG_getPeers() *peers {
 	return &c.peers
 }
 
-func (ps *peers) DEBUG_newPeer(box boxPubKey, sig sigPubKey, link boxSharedKey) *peer {
+func (ps *peers) DEBUG_newPeer(box crypto.BoxPubKey, sig crypto.SigPubKey, link crypto.BoxSharedKey) *peer {
 	//in <-chan []byte,
 	//out chan<- []byte) *peer {
 	return ps.newPeer(&box, &sig, &link, "(simulator)") //, in, out)
@@ -98,7 +100,7 @@ func (ps *peers) DEBUG_startPeers() {
 }
 */
 
-func (ps *peers) DEBUG_hasPeer(key sigPubKey) bool {
+func (ps *peers) DEBUG_hasPeer(key crypto.SigPubKey) bool {
 	ports := ps.ports.Load().(map[switchPort]*peer)
 	for _, p := range ports {
 		if p == nil {
@@ -120,7 +122,7 @@ func (ps *peers) DEBUG_getPorts() map[switchPort]*peer {
 	return newPeers
 }
 
-func (p *peer) DEBUG_getSigKey() sigPubKey {
+func (p *peer) DEBUG_getSigKey() crypto.SigPubKey {
 	return p.sig
 }
 
@@ -292,8 +294,8 @@ func (c *Core) DEBUG_startLoopbackUDPInterface() {
 
 ////////////////////////////////////////////////////////////////////////////////
 
-func (c *Core) DEBUG_getAddr() *address {
+func (c *Core) DEBUG_getAddr() *address.Address {
-	return address_addrForNodeID(&c.dht.nodeID)
+	return address.AddrForNodeID(&c.dht.nodeID)
 }
 
 func (c *Core) DEBUG_startTun(ifname string, iftapmode bool) {
@@ -302,7 +304,7 @@ func (c *Core) DEBUG_startTun(ifname string, iftapmode bool) {
 
 func (c *Core) DEBUG_startTunWithMTU(ifname string, iftapmode bool, mtu int) {
 	addr := c.DEBUG_getAddr()
-	straddr := fmt.Sprintf("%s/%v", net.IP(addr[:]).String(), 8*len(address_prefix))
+	straddr := fmt.Sprintf("%s/%v", net.IP(addr[:]).String(), 8*len(address.GetPrefix()))
 	if ifname != "none" {
 		err := c.router.tun.setup(ifname, iftapmode, straddr, mtu)
 		if err != nil {
@@ -320,38 +322,38 @@ func (c *Core) DEBUG_stopTun() {
 
 ////////////////////////////////////////////////////////////////////////////////
 
-func (c *Core) DEBUG_newBoxKeys() (*boxPubKey, *boxPrivKey) {
+func (c *Core) DEBUG_newBoxKeys() (*crypto.BoxPubKey, *crypto.BoxPrivKey) {
-	return newBoxKeys()
+	return crypto.NewBoxKeys()
 }
 
-func (c *Core) DEBUG_getSharedKey(myPrivKey *boxPrivKey, othersPubKey *boxPubKey) *boxSharedKey {
+func (c *Core) DEBUG_getSharedKey(myPrivKey *crypto.BoxPrivKey, othersPubKey *crypto.BoxPubKey) *crypto.BoxSharedKey {
-	return getSharedKey(myPrivKey, othersPubKey)
+	return crypto.GetSharedKey(myPrivKey, othersPubKey)
 }
 
-func (c *Core) DEBUG_newSigKeys() (*sigPubKey, *sigPrivKey) {
+func (c *Core) DEBUG_newSigKeys() (*crypto.SigPubKey, *crypto.SigPrivKey) {
-	return newSigKeys()
+	return crypto.NewSigKeys()
 }
 
-func (c *Core) DEBUG_getNodeID(pub *boxPubKey) *NodeID {
+func (c *Core) DEBUG_getNodeID(pub *crypto.BoxPubKey) *crypto.NodeID {
-	return getNodeID(pub)
+	return crypto.GetNodeID(pub)
 }
 
-func (c *Core) DEBUG_getTreeID(pub *sigPubKey) *TreeID {
+func (c *Core) DEBUG_getTreeID(pub *crypto.SigPubKey) *crypto.TreeID {
-	return getTreeID(pub)
+	return crypto.GetTreeID(pub)
 }
 
-func (c *Core) DEBUG_addrForNodeID(nodeID *NodeID) string {
+func (c *Core) DEBUG_addrForNodeID(nodeID *crypto.NodeID) string {
-	return net.IP(address_addrForNodeID(nodeID)[:]).String()
+	return net.IP(address.AddrForNodeID(nodeID)[:]).String()
 }
 
 func (c *Core) DEBUG_init(bpub []byte,
 	bpriv []byte,
 	spub []byte,
 	spriv []byte) {
-	var boxPub boxPubKey
+	var boxPub crypto.BoxPubKey
-	var boxPriv boxPrivKey
+	var boxPriv crypto.BoxPrivKey
-	var sigPub sigPubKey
+	var sigPub crypto.SigPubKey
-	var sigPriv sigPrivKey
+	var sigPriv crypto.SigPrivKey
 	copy(boxPub[:], bpub)
 	copy(boxPriv[:], bpriv)
 	copy(sigPub[:], spub)
@@ -553,13 +555,13 @@ func (c *Core) DEBUG_simFixMTU() {
 
 func Util_testAddrIDMask() {
 	for idx := 0; idx < 16; idx++ {
-		var orig NodeID
+		var orig crypto.NodeID
 		orig[8] = 42
 		for bidx := 0; bidx < idx; bidx++ {
 			orig[bidx/8] |= (0x80 >> uint8(bidx%8))
 		}
-		addr := address_addrForNodeID(&orig)
+		addr := address.AddrForNodeID(&orig)
-		nid, mask := addr.getNodeIDandMask()
+		nid, mask := addr.GetNodeIDandMask()
 		for b := 0; b < len(mask); b++ {
 			nid[b] &= mask[b]
 			orig[b] &= mask[b]

src/yggdrasil/dht.go

@@ -8,6 +8,8 @@ package yggdrasil
 import (
 	"sort"
 	"time"
+
+	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
 )
 
 const dht_lookup_size = 16
@@ -15,8 +17,8 @@ const dht_lookup_size = 16
 // dhtInfo represents everything we know about a node in the DHT.
 // This includes its key, a cache of it's NodeID, coords, and timing/ping related info for deciding who/when to ping nodes for maintenance.
 type dhtInfo struct {
-	nodeID_hidden *NodeID
+	nodeID_hidden *crypto.NodeID
-	key           boxPubKey
+	key           crypto.BoxPubKey
 	coords        []byte
 	recv          time.Time // When we last received a message
 	pings         int       // Time out if at least 3 consecutive maintenance pings drop
@@ -24,9 +26,9 @@ type dhtInfo struct {
 }
 
 // Returns the *NodeID associated with dhtInfo.key, calculating it on the fly the first time or from a cache all subsequent times.
-func (info *dhtInfo) getNodeID() *NodeID {
+func (info *dhtInfo) getNodeID() *crypto.NodeID {
 	if info.nodeID_hidden == nil {
-		info.nodeID_hidden = getNodeID(&info.key)
+		info.nodeID_hidden = crypto.GetNodeID(&info.key)
 	}
 	return info.nodeID_hidden
 }
@@ -34,36 +36,36 @@ func (info *dhtInfo) getNodeID() *NodeID {
 // Request for a node to do a lookup.
 // Includes our key and coords so they can send a response back, and the destination NodeID we want to ask about.
 type dhtReq struct {
-	Key    boxPubKey // Key of whoever asked
+	Key    crypto.BoxPubKey // Key of whoever asked
-	Coords []byte    // Coords of whoever asked
+	Coords []byte           // Coords of whoever asked
-	Dest   NodeID    // NodeID they're asking about
+	Dest   crypto.NodeID    // NodeID they're asking about
 }
 
 // Response to a DHT lookup.
 // Includes the key and coords of the node that's responding, and the destination they were asked about.
 // The main part is Infos []*dhtInfo, the lookup response.
 type dhtRes struct {
-	Key    boxPubKey // key of the sender
+	Key    crypto.BoxPubKey // key of the sender
-	Coords []byte    // coords of the sender
+	Coords []byte           // coords of the sender
-	Dest   NodeID
+	Dest   crypto.NodeID
 	Infos  []*dhtInfo // response
 }
 
 // Parts of a DHT req usable as a key in a map.
 type dhtReqKey struct {
-	key  boxPubKey
+	key  crypto.BoxPubKey
-	dest NodeID
+	dest crypto.NodeID
 }
 
 // The main DHT struct.
 type dht struct {
 	core      *Core
-	nodeID    NodeID
+	nodeID    crypto.NodeID
 	peers     chan *dhtInfo                  // other goroutines put incoming dht updates here
 	reqs      map[dhtReqKey]time.Time        // Keeps track of recent outstanding requests
 	callbacks map[dhtReqKey]dht_callbackInfo // Search and admin lookup callbacks
 	// These next two could be replaced by a single linked list or similar...
-	table map[NodeID]*dhtInfo
+	table map[crypto.NodeID]*dhtInfo
 	imp   []*dhtInfo
 }
 
@@ -80,12 +82,12 @@ func (t *dht) init(c *Core) {
 // This empties all info from the DHT and drops outstanding requests.
 func (t *dht) reset() {
 	t.reqs = make(map[dhtReqKey]time.Time)
-	t.table = make(map[NodeID]*dhtInfo)
+	t.table = make(map[crypto.NodeID]*dhtInfo)
 	t.imp = nil
 }
 
 // Does a DHT lookup and returns up to dht_lookup_size results.
-func (t *dht) lookup(nodeID *NodeID, everything bool) []*dhtInfo {
+func (t *dht) lookup(nodeID *crypto.NodeID, everything bool) []*dhtInfo {
 	results := make([]*dhtInfo, 0, len(t.table))
 	for _, info := range t.table {
 		results = append(results, info)
@@ -133,9 +135,9 @@ func (t *dht) insert(info *dhtInfo) {
 }
 
 // Return true if first/second/third are (partially) ordered correctly.
-func dht_ordered(first, second, third *NodeID) bool {
+func dht_ordered(first, second, third *crypto.NodeID) bool {
-	lessOrEqual := func(first, second *NodeID) bool {
+	lessOrEqual := func(first, second *crypto.NodeID) bool {
-		for idx := 0; idx < NodeIDLen; idx++ {
+		for idx := 0; idx < crypto.NodeIDLen; idx++ {
 			if first[idx] > second[idx] {
 				return false
 			}
@@ -190,7 +192,7 @@ func (t *dht) sendRes(res *dhtRes, req *dhtReq) {
 	// Send a reply for a dhtReq
 	bs := res.encode()
 	shared := t.core.sessions.getSharedKey(&t.core.boxPriv, &req.Key)
-	payload, nonce := boxSeal(shared, bs, nil)
+	payload, nonce := crypto.BoxSeal(shared, bs, nil)
 	p := wire_protoTrafficPacket{
 		Coords:  req.Coords,
 		ToKey:   req.Key,
@@ -252,7 +254,7 @@ func (t *dht) sendReq(req *dhtReq, dest *dhtInfo) {
 	// Send a dhtReq to the node in dhtInfo
 	bs := req.encode()
 	shared := t.core.sessions.getSharedKey(&t.core.boxPriv, &dest.key)
-	payload, nonce := boxSeal(shared, bs, nil)
+	payload, nonce := crypto.BoxSeal(shared, bs, nil)
 	p := wire_protoTrafficPacket{
 		Coords:  dest.coords,
 		ToKey:   dest.key,
@@ -267,7 +269,7 @@ func (t *dht) sendReq(req *dhtReq, dest *dhtInfo) {
 }
 
 // Sends a lookup to this info, looking for the target.
-func (t *dht) ping(info *dhtInfo, target *NodeID) {
+func (t *dht) ping(info *dhtInfo, target *crypto.NodeID) {
 	// Creates a req for the node at dhtInfo, asking them about the target (if one is given) or themself (if no target is given)
 	if target == nil {
 		target = &t.nodeID

src/yggdrasil/icmpv6.go

@@ -17,6 +17,8 @@ import (
 
 	"golang.org/x/net/icmp"
 	"golang.org/x/net/ipv6"
+
+	"github.com/yggdrasil-network/yggdrasil-go/src/address"
 )
 
 type macAddress [6]byte
@@ -27,7 +29,7 @@ type icmpv6 struct {
 	tun      *tunAdapter
 	mylladdr net.IP
 	mymac    macAddress
-	peermacs map[address]neighbor
+	peermacs map[address.Address]neighbor
 }
 
 type neighbor struct {
@@ -59,7 +61,7 @@ func ipv6Header_Marshal(h *ipv6.Header) ([]byte, error) {
 // addresses.
 func (i *icmpv6) init(t *tunAdapter) {
 	i.tun = t
-	i.peermacs = make(map[address]neighbor)
+	i.peermacs = make(map[address.Address]neighbor)
 
 	// Our MAC address and link-local address
 	i.mymac = macAddress{
@@ -172,7 +174,7 @@ func (i *icmpv6) parse_packet_tun(datain []byte, datamac *[]byte) ([]byte, error
 		}
 	case ipv6.ICMPTypeNeighborAdvertisement:
 		if datamac != nil {
-			var addr address
+			var addr address.Address
 			var mac macAddress
 			copy(addr[:], ipv6Header.Src[:])
 			copy(mac[:], (*datamac)[:])
@@ -254,7 +256,7 @@ func (i *icmpv6) create_icmpv6_tun(dst net.IP, src net.IP, mtype ipv6.ICMPType,
 	return responsePacket, nil
 }
 
-func (i *icmpv6) create_ndp_tap(dst address) ([]byte, error) {
+func (i *icmpv6) create_ndp_tap(dst address.Address) ([]byte, error) {
 	// Create the ND payload
 	var payload [28]byte
 	copy(payload[:4], []byte{0x00, 0x00, 0x00, 0x00})
@@ -263,7 +265,7 @@ func (i *icmpv6) create_ndp_tap(dst address) ([]byte, error) {
 	copy(payload[22:28], i.mymac[:6])
 
 	// Create the ICMPv6 solicited-node address
-	var dstaddr address
+	var dstaddr address.Address
 	copy(dstaddr[:13], []byte{
 		0xFF, 0x02, 0x00, 0x00,
 		0x00, 0x00, 0x00, 0x00,
@@ -296,13 +298,13 @@ func (i *icmpv6) create_ndp_tap(dst address) ([]byte, error) {
 // to the Yggdrasil TAP adapter.
 func (i *icmpv6) handle_ndp(in []byte) ([]byte, error) {
 	// Ignore NDP requests for anything outside of fd00::/8
-	var source address
+	var source address.Address
 	copy(source[:], in[8:])
-	var snet subnet
+	var snet address.Subnet
 	copy(snet[:], in[8:])
 	switch {
-	case source.isValid():
+	case source.IsValid():
-	case snet.isValid():
+	case snet.IsValid():
 	default:
 		return nil, errors.New("Not an NDP for 0200::/7")
 	}

src/yggdrasil/nodeinfo.go

@@ -6,15 +6,17 @@ import (
 	"runtime"
 	"sync"
 	"time"
+
+	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
 )
 
 type nodeinfo struct {
 	core            *Core
 	myNodeInfo      nodeinfoPayload
 	myNodeInfoMutex sync.RWMutex
-	callbacks       map[boxPubKey]nodeinfoCallback
+	callbacks       map[crypto.BoxPubKey]nodeinfoCallback
 	callbacksMutex  sync.Mutex
-	cache           map[boxPubKey]nodeinfoCached
+	cache           map[crypto.BoxPubKey]nodeinfoCached
 	cacheMutex      sync.RWMutex
 }
 
@@ -32,8 +34,8 @@ type nodeinfoCallback struct {
 
 // Represents a session nodeinfo packet.
 type nodeinfoReqRes struct {
-	SendPermPub boxPubKey // Sender's permanent key
+	SendPermPub crypto.BoxPubKey // Sender's permanent key
-	SendCoords  []byte    // Sender's coords
+	SendCoords  []byte           // Sender's coords
 	IsResponse  bool
 	NodeInfo    nodeinfoPayload
 }
@@ -42,8 +44,8 @@ type nodeinfoReqRes struct {
 // the cache/callback maps clean of stale entries
 func (m *nodeinfo) init(core *Core) {
 	m.core = core
-	m.callbacks = make(map[boxPubKey]nodeinfoCallback)
+	m.callbacks = make(map[crypto.BoxPubKey]nodeinfoCallback)
-	m.cache = make(map[boxPubKey]nodeinfoCached)
+	m.cache = make(map[crypto.BoxPubKey]nodeinfoCached)
 
 	go func() {
 		for {
@@ -67,7 +69,7 @@ func (m *nodeinfo) init(core *Core) {
 }
 
 // Add a callback for a nodeinfo lookup
-func (m *nodeinfo) addCallback(sender boxPubKey, call func(nodeinfo *nodeinfoPayload)) {
+func (m *nodeinfo) addCallback(sender crypto.BoxPubKey, call func(nodeinfo *nodeinfoPayload)) {
 	m.callbacksMutex.Lock()
 	defer m.callbacksMutex.Unlock()
 	m.callbacks[sender] = nodeinfoCallback{
@@ -77,7 +79,7 @@ func (m *nodeinfo) addCallback(sender boxPubKey, call func(nodeinfo *nodeinfoPay
 }
 
 // Handles the callback, if there is one
-func (m *nodeinfo) callback(sender boxPubKey, nodeinfo nodeinfoPayload) {
+func (m *nodeinfo) callback(sender crypto.BoxPubKey, nodeinfo nodeinfoPayload) {
 	m.callbacksMutex.Lock()
 	defer m.callbacksMutex.Unlock()
 	if callback, ok := m.callbacks[sender]; ok {
@@ -123,7 +125,7 @@ func (m *nodeinfo) setNodeInfo(given interface{}) error {
 }
 
 // Add nodeinfo into the cache for a node
-func (m *nodeinfo) addCachedNodeInfo(key boxPubKey, payload nodeinfoPayload) {
+func (m *nodeinfo) addCachedNodeInfo(key crypto.BoxPubKey, payload nodeinfoPayload) {
 	m.cacheMutex.Lock()
 	defer m.cacheMutex.Unlock()
 	m.cache[key] = nodeinfoCached{
@@ -133,7 +135,7 @@ func (m *nodeinfo) addCachedNodeInfo(key boxPubKey, payload nodeinfoPayload) {
 }
 
 // Get a nodeinfo entry from the cache
-func (m *nodeinfo) getCachedNodeInfo(key boxPubKey) (nodeinfoPayload, error) {
+func (m *nodeinfo) getCachedNodeInfo(key crypto.BoxPubKey) (nodeinfoPayload, error) {
 	m.cacheMutex.RLock()
 	defer m.cacheMutex.RUnlock()
 	if nodeinfo, ok := m.cache[key]; ok {
@@ -153,7 +155,7 @@ func (m *nodeinfo) handleNodeInfo(nodeinfo *nodeinfoReqRes) {
 }
 
 // Send nodeinfo request or response - called from the router
-func (m *nodeinfo) sendNodeInfo(key boxPubKey, coords []byte, isResponse bool) {
+func (m *nodeinfo) sendNodeInfo(key crypto.BoxPubKey, coords []byte, isResponse bool) {
 	table := m.core.switchTable.table.Load().(lookupTable)
 	nodeinfo := nodeinfoReqRes{
 		SendCoords: table.self.getCoords(),
@@ -162,7 +164,7 @@ func (m *nodeinfo) sendNodeInfo(key boxPubKey, coords []byte, isResponse bool) {
 	}
 	bs := nodeinfo.encode()
 	shared := m.core.sessions.getSharedKey(&m.core.boxPriv, &key)
-	payload, nonce := boxSeal(shared, bs, nil)
+	payload, nonce := crypto.BoxSeal(shared, bs, nil)
 	p := wire_protoTrafficPacket{
 		Coords:  coords,
 		ToKey:   key,

src/yggdrasil/peer.go

@@ -8,6 +8,9 @@ import (
 	"sync"
 	"sync/atomic"
 	"time"
+
+	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
+	"github.com/yggdrasil-network/yggdrasil-go/src/util"
 )
 
 // The peers struct represents peers with an active connection.
@@ -19,7 +22,7 @@ type peers struct {
 	mutex                       sync.Mutex   // Synchronize writes to atomic
 	ports                       atomic.Value //map[switchPort]*peer, use CoW semantics
 	authMutex                   sync.RWMutex
-	allowedEncryptionPublicKeys map[boxPubKey]struct{}
+	allowedEncryptionPublicKeys map[crypto.BoxPubKey]struct{}
 }
 
 // Initializes the peers struct.
@@ -28,11 +31,11 @@ func (ps *peers) init(c *Core) {
 	defer ps.mutex.Unlock()
 	ps.putPorts(make(map[switchPort]*peer))
 	ps.core = c
-	ps.allowedEncryptionPublicKeys = make(map[boxPubKey]struct{})
+	ps.allowedEncryptionPublicKeys = make(map[crypto.BoxPubKey]struct{})
 }
 
 // Returns true if an incoming peer connection to a key is allowed, either because the key is in the whitelist or because the whitelist is empty.
-func (ps *peers) isAllowedEncryptionPublicKey(box *boxPubKey) bool {
+func (ps *peers) isAllowedEncryptionPublicKey(box *crypto.BoxPubKey) bool {
 	ps.authMutex.RLock()
 	defer ps.authMutex.RUnlock()
 	_, isIn := ps.allowedEncryptionPublicKeys[*box]
@@ -40,24 +43,24 @@ func (ps *peers) isAllowedEncryptionPublicKey(box *boxPubKey) bool {
 }
 
 // Adds a key to the whitelist.
-func (ps *peers) addAllowedEncryptionPublicKey(box *boxPubKey) {
+func (ps *peers) addAllowedEncryptionPublicKey(box *crypto.BoxPubKey) {
 	ps.authMutex.Lock()
 	defer ps.authMutex.Unlock()
 	ps.allowedEncryptionPublicKeys[*box] = struct{}{}
 }
 
 // Removes a key from the whitelist.
-func (ps *peers) removeAllowedEncryptionPublicKey(box *boxPubKey) {
+func (ps *peers) removeAllowedEncryptionPublicKey(box *crypto.BoxPubKey) {
 	ps.authMutex.Lock()
 	defer ps.authMutex.Unlock()
 	delete(ps.allowedEncryptionPublicKeys, *box)
 }
 
 // Gets the whitelist of allowed keys for incoming connections.
-func (ps *peers) getAllowedEncryptionPublicKeys() []boxPubKey {
+func (ps *peers) getAllowedEncryptionPublicKeys() []crypto.BoxPubKey {
 	ps.authMutex.RLock()
 	defer ps.authMutex.RUnlock()
-	keys := make([]boxPubKey, 0, len(ps.allowedEncryptionPublicKeys))
+	keys := make([]crypto.BoxPubKey, 0, len(ps.allowedEncryptionPublicKeys))
 	for key := range ps.allowedEncryptionPublicKeys {
 		keys = append(keys, key)
 	}
@@ -81,10 +84,10 @@ type peer struct {
 	// BUG: sync/atomic, 32 bit platforms need the above to be the first element
 	core       *Core
 	port       switchPort
-	box        boxPubKey
+	box        crypto.BoxPubKey
-	sig        sigPubKey
+	sig        crypto.SigPubKey
-	shared     boxSharedKey
+	shared     crypto.BoxSharedKey
-	linkShared boxSharedKey
+	linkShared crypto.BoxSharedKey
 	endpoint   string
 	firstSeen  time.Time       // To track uptime for getPeers
 	linkOut    (chan []byte)   // used for protocol traffic (to bypass queues)
@@ -95,11 +98,11 @@ type peer struct {
 }
 
 // Creates a new peer with the specified box, sig, and linkShared keys, using the lowest unocupied port number.
-func (ps *peers) newPeer(box *boxPubKey, sig *sigPubKey, linkShared *boxSharedKey, endpoint string) *peer {
+func (ps *peers) newPeer(box *crypto.BoxPubKey, sig *crypto.SigPubKey, linkShared *crypto.BoxSharedKey, endpoint string) *peer {
 	now := time.Now()
 	p := peer{box: *box,
 		sig:        *sig,
-		shared:     *getSharedKey(&ps.core.boxPriv, box),
+		shared:     *crypto.GetSharedKey(&ps.core.boxPriv, box),
 		linkShared: *linkShared,
 		endpoint:   endpoint,
 		firstSeen:  now,
@@ -212,7 +215,7 @@ func (p *peer) handlePacket(packet []byte) {
 	case wire_LinkProtocolTraffic:
 		p.handleLinkTraffic(packet)
 	default:
-		util_putBytes(packet)
+		util.PutBytes(packet)
 	}
 }
 
@@ -237,13 +240,13 @@ func (p *peer) sendPacket(packet []byte) {
 // This wraps the packet in the inner (ephemeral) and outer (permanent) crypto layers.
 // It sends it to p.linkOut, which bypasses the usual packet queues.
 func (p *peer) sendLinkPacket(packet []byte) {
-	innerPayload, innerNonce := boxSeal(&p.linkShared, packet, nil)
+	innerPayload, innerNonce := crypto.BoxSeal(&p.linkShared, packet, nil)
 	innerLinkPacket := wire_linkProtoTrafficPacket{
 		Nonce:   *innerNonce,
 		Payload: innerPayload,
 	}
 	outerPayload := innerLinkPacket.encode()
-	bs, nonce := boxSeal(&p.shared, outerPayload, nil)
+	bs, nonce := crypto.BoxSeal(&p.shared, outerPayload, nil)
 	linkPacket := wire_linkProtoTrafficPacket{
 		Nonce:   *nonce,
 		Payload: bs,
@@ -259,7 +262,7 @@ func (p *peer) handleLinkTraffic(bs []byte) {
 	if !packet.decode(bs) {
 		return
 	}
-	outerPayload, isOK := boxOpen(&p.shared, packet.Payload, &packet.Nonce)
+	outerPayload, isOK := crypto.BoxOpen(&p.shared, packet.Payload, &packet.Nonce)
 	if !isOK {
 		return
 	}
@@ -267,7 +270,7 @@ func (p *peer) handleLinkTraffic(bs []byte) {
 	if !innerPacket.decode(outerPayload) {
 		return
 	}
-	payload, isOK := boxOpen(&p.linkShared, innerPacket.Payload, &innerPacket.Nonce)
+	payload, isOK := crypto.BoxOpen(&p.linkShared, innerPacket.Payload, &innerPacket.Nonce)
 	if !isOK {
 		return
 	}
@@ -279,7 +282,7 @@ func (p *peer) handleLinkTraffic(bs []byte) {
 	case wire_SwitchMsg:
 		p.handleSwitchMsg(payload)
 	default:
-		util_putBytes(bs)
+		util.PutBytes(bs)
 	}
 }
 
@@ -293,7 +296,7 @@ func (p *peer) sendSwitchMsg() {
 	msg.Hops = append(msg.Hops, switchMsgHop{
 		Port: p.port,
 		Next: p.sig,
-		Sig:  *sign(&p.core.sigPriv, bs),
+		Sig:  *crypto.Sign(&p.core.sigPriv, bs),
 	})
 	packet := msg.encode()
 	p.sendLinkPacket(packet)
@@ -317,7 +320,7 @@ func (p *peer) handleSwitchMsg(packet []byte) {
 		sigMsg.Hops = msg.Hops[:idx]
 		loc.coords = append(loc.coords, hop.Port)
 		bs := getBytesForSig(&hop.Next, &sigMsg)
-		if !verify(&prevKey, bs, &hop.Sig) {
+		if !crypto.Verify(&prevKey, bs, &hop.Sig) {
 			p.core.peers.removePeer(p.port)
 		}
 		prevKey = hop.Next
@@ -339,7 +342,7 @@ func (p *peer) handleSwitchMsg(packet []byte) {
 
 // This generates the bytes that we sign or check the signature of for a switchMsg.
 // It begins with the next node's key, followed by the root and the timetsamp, followed by coords being advertised to the next node.
-func getBytesForSig(next *sigPubKey, msg *switchMsg) []byte {
+func getBytesForSig(next *crypto.SigPubKey, msg *switchMsg) []byte {
 	var loc switchLocator
 	for _, hop := range msg.Hops {
 		loc.coords = append(loc.coords, hop.Port)

src/yggdrasil/router.go

@@ -28,14 +28,18 @@ import (
 
 	"golang.org/x/net/icmp"
 	"golang.org/x/net/ipv6"
+
+	"github.com/yggdrasil-network/yggdrasil-go/src/address"
+	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
+	"github.com/yggdrasil-network/yggdrasil-go/src/util"
 )
 
 // The router struct has channels to/from the tun/tap device and a self peer (0), which is how messages are passed between this node and the peers/switch layer.
 // The router's mainLoop goroutine is responsible for managing all information related to the dht, searches, and crypto sessions.
 type router struct {
 	core      *Core
-	addr      address
+	addr      address.Address
-	subnet    subnet
+	subnet    address.Subnet
 	in        <-chan []byte          // packets we received from the network, link to peer's "out"
 	out       func([]byte)           // packets we're sending to the network, link to peer's "in"
 	toRecv    chan router_recvPacket // packets to handle via recvPacket()
@@ -57,17 +61,17 @@ type router_recvPacket struct {
 // Initializes the router struct, which includes setting up channels to/from the tun/tap.
 func (r *router) init(core *Core) {
 	r.core = core
-	r.addr = *address_addrForNodeID(&r.core.dht.nodeID)
+	r.addr = *address.AddrForNodeID(&r.core.dht.nodeID)
-	r.subnet = *address_subnetForNodeID(&r.core.dht.nodeID)
+	r.subnet = *address.SubnetForNodeID(&r.core.dht.nodeID)
 	in := make(chan []byte, 32) // TODO something better than this...
-	p := r.core.peers.newPeer(&r.core.boxPub, &r.core.sigPub, &boxSharedKey{}, "(self)")
+	p := r.core.peers.newPeer(&r.core.boxPub, &r.core.sigPub, &crypto.BoxSharedKey{}, "(self)")
 	p.out = func(packet []byte) {
 		// This is to make very sure it never blocks
 		select {
 		case in <- packet:
 			return
 		default:
-			util_putBytes(packet)
+			util.PutBytes(packet)
 		}
 	}
 	r.in = in
@@ -121,7 +125,7 @@ func (r *router) mainLoop() {
 				r.core.switchTable.doMaintenance()
 				r.core.dht.doMaintenance()
 				r.core.sessions.cleanup()
-				util_getBytes() // To slowly drain things
+				util.GetBytes() // To slowly drain things
 			}
 		case f := <-r.admin:
 			f()
@@ -135,11 +139,11 @@ func (r *router) mainLoop() {
 // If the session hasn't responded recently, it triggers a ping or search to keep things alive or deal with broken coords *relatively* quickly.
 // It also deals with oversized packets if there are MTU issues by calling into icmpv6.go to spoof PacketTooBig traffic, or DestinationUnreachable if the other side has their tun/tap disabled.
 func (r *router) sendPacket(bs []byte) {
-	var sourceAddr address
+	var sourceAddr address.Address
-	var destAddr address
+	var destAddr address.Address
-	var destSnet subnet
+	var destSnet address.Subnet
-	var destPubKey *boxPubKey
+	var destPubKey *crypto.BoxPubKey
-	var destNodeID *NodeID
+	var destNodeID *crypto.NodeID
 	var addrlen int
 	if bs[0]&0xf0 == 0x60 {
 		// Check if we have a fully-sized header
@@ -169,19 +173,19 @@ func (r *router) sendPacket(bs []byte) {
 		// configured crypto-key routing source subnets
 		return
 	}
-	if !destAddr.isValid() && !destSnet.isValid() {
+	if !destAddr.IsValid() && !destSnet.IsValid() {
 		// The addresses didn't match valid Yggdrasil node addresses so let's see
 		// whether it matches a crypto-key routing range instead
 		if key, err := r.cryptokey.getPublicKeyForAddress(destAddr, addrlen); err == nil {
 			// A public key was found, get the node ID for the search
 			destPubKey = &key
-			destNodeID = getNodeID(destPubKey)
+			destNodeID = crypto.GetNodeID(destPubKey)
 			// Do a quick check to ensure that the node ID refers to a vaild Yggdrasil
 			// address or subnet - this might be superfluous
-			addr := *address_addrForNodeID(destNodeID)
+			addr := *address.AddrForNodeID(destNodeID)
 			copy(destAddr[:], addr[:])
 			copy(destSnet[:], addr[:])
-			if !destAddr.isValid() && !destSnet.isValid() {
+			if !destAddr.IsValid() && !destSnet.IsValid() {
 				return
 			}
 		} else {
@@ -190,25 +194,25 @@ func (r *router) sendPacket(bs []byte) {
 		}
 	}
 	doSearch := func(packet []byte) {
-		var nodeID, mask *NodeID
+		var nodeID, mask *crypto.NodeID
 		switch {
 		case destNodeID != nil:
 			// We already know the full node ID, probably because it's from a CKR
 			// route in which the public key is known ahead of time
 			nodeID = destNodeID
-			var m NodeID
+			var m crypto.NodeID
 			for i := range m {
 				m[i] = 0xFF
 			}
 			mask = &m
-		case destAddr.isValid():
+		case destAddr.IsValid():
 			// We don't know the full node ID - try and use the address to generate
 			// a truncated node ID
-			nodeID, mask = destAddr.getNodeIDandMask()
+			nodeID, mask = destAddr.GetNodeIDandMask()
-		case destSnet.isValid():
+		case destSnet.IsValid():
 			// We don't know the full node ID - try and use the subnet to generate
 			// a truncated node ID
-			nodeID, mask = destSnet.getNodeIDandMask()
+			nodeID, mask = destSnet.GetNodeIDandMask()
 		default:
 			return
 		}
@@ -223,10 +227,10 @@ func (r *router) sendPacket(bs []byte) {
 	}
 	var sinfo *sessionInfo
 	var isIn bool
-	if destAddr.isValid() {
+	if destAddr.IsValid() {
 		sinfo, isIn = r.core.sessions.getByTheirAddr(&destAddr)
 	}
-	if destSnet.isValid() {
+	if destSnet.IsValid() {
 		sinfo, isIn = r.core.sessions.getByTheirSubnet(&destSnet)
 	}
 	switch {
@@ -305,12 +309,12 @@ func (r *router) sendPacket(bs []byte) {
 func (r *router) recvPacket(bs []byte, sinfo *sessionInfo) {
 	// Note: called directly by the session worker, not the router goroutine
 	if len(bs) < 24 {
-		util_putBytes(bs)
+		util.PutBytes(bs)
 		return
 	}
-	var sourceAddr address
+	var sourceAddr address.Address
-	var dest address
+	var dest address.Address
-	var snet subnet
+	var snet address.Subnet
 	var addrlen int
 	if bs[0]&0xf0 == 0x60 {
 		// IPv6 address
@@ -330,17 +334,17 @@ func (r *router) recvPacket(bs []byte, sinfo *sessionInfo) {
 	// Check that the packet is destined for either our Yggdrasil address or
 	// subnet, or that it matches one of the crypto-key routing source routes
 	if !r.cryptokey.isValidSource(dest, addrlen) {
-		util_putBytes(bs)
+		util.PutBytes(bs)
 		return
 	}
 	// See whether the packet they sent should have originated from this session
 	switch {
-	case sourceAddr.isValid() && sourceAddr == sinfo.theirAddr:
+	case sourceAddr.IsValid() && sourceAddr == sinfo.theirAddr:
-	case snet.isValid() && snet == sinfo.theirSubnet:
+	case snet.IsValid() && snet == sinfo.theirSubnet:
 	default:
 		key, err := r.cryptokey.getPublicKeyForAddress(sourceAddr, addrlen)
 		if err != nil || key != sinfo.theirPermPub {
-			util_putBytes(bs)
+			util.PutBytes(bs)
 			return
 		}
 	}
@@ -366,7 +370,7 @@ func (r *router) handleIn(packet []byte) {
 // Handles incoming traffic, i.e. encapuslated ordinary IPv6 packets.
 // Passes them to the crypto session worker to be decrypted and sent to the tun/tap.
 func (r *router) handleTraffic(packet []byte) {
-	defer util_putBytes(packet)
+	defer util.PutBytes(packet)
 	p := wire_trafficPacket{}
 	if !p.decode(packet) {
 		return
@@ -386,14 +390,14 @@ func (r *router) handleProto(packet []byte) {
 		return
 	}
 	// Now try to open the payload
-	var sharedKey *boxSharedKey
+	var sharedKey *crypto.BoxSharedKey
 	if p.ToKey == r.core.boxPub {
 		// Try to open using our permanent key
 		sharedKey = r.core.sessions.getSharedKey(&r.core.boxPriv, &p.FromKey)
 	} else {
 		return
 	}
-	bs, isOK := boxOpen(sharedKey, p.Payload, &p.Nonce)
+	bs, isOK := crypto.BoxOpen(sharedKey, p.Payload, &p.Nonce)
 	if !isOK {
 		return
 	}
@@ -418,12 +422,12 @@ func (r *router) handleProto(packet []byte) {
 	case wire_DHTLookupResponse:
 		r.handleDHTRes(bs, &p.FromKey)
 	default:
-		util_putBytes(packet)
+		util.PutBytes(packet)
 	}
 }
 
 // Decodes session pings from wire format and passes them to sessions.handlePing where they either create or update a session.
-func (r *router) handlePing(bs []byte, fromKey *boxPubKey) {
+func (r *router) handlePing(bs []byte, fromKey *crypto.BoxPubKey) {
 	ping := sessionPing{}
 	if !ping.decode(bs) {
 		return
@@ -433,12 +437,12 @@ func (r *router) handlePing(bs []byte, fromKey *boxPubKey) {
 }
 
 // Handles session pongs (which are really pings with an extra flag to prevent acknowledgement).
-func (r *router) handlePong(bs []byte, fromKey *boxPubKey) {
+func (r *router) handlePong(bs []byte, fromKey *crypto.BoxPubKey) {
 	r.handlePing(bs, fromKey)
 }
 
 // Decodes dht requests and passes them to dht.handleReq to trigger a lookup/response.
-func (r *router) handleDHTReq(bs []byte, fromKey *boxPubKey) {
+func (r *router) handleDHTReq(bs []byte, fromKey *crypto.BoxPubKey) {
 	req := dhtReq{}
 	if !req.decode(bs) {
 		return
@@ -448,7 +452,7 @@ func (r *router) handleDHTReq(bs []byte, fromKey *boxPubKey) {
 }
 
 // Decodes dht responses and passes them to dht.handleRes to update the DHT table and further pass them to the search code (if applicable).
-func (r *router) handleDHTRes(bs []byte, fromKey *boxPubKey) {
+func (r *router) handleDHTRes(bs []byte, fromKey *crypto.BoxPubKey) {
 	res := dhtRes{}
 	if !res.decode(bs) {
 		return
@@ -458,7 +462,7 @@ func (r *router) handleDHTRes(bs []byte, fromKey *boxPubKey) {
 }
 
 // Decodes nodeinfo request
-func (r *router) handleNodeInfo(bs []byte, fromKey *boxPubKey) {
+func (r *router) handleNodeInfo(bs []byte, fromKey *crypto.BoxPubKey) {
 	req := nodeinfoReqRes{}
 	if !req.decode(bs) {
 		return

src/yggdrasil/search.go

@@ -17,6 +17,8 @@ package yggdrasil
 import (
 	"sort"
 	"time"
+
+	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
 )
 
 // This defines the maximum number of dhtInfo that we keep track of for nodes to query in an ongoing search.
@@ -30,28 +32,28 @@ const search_RETRY_TIME = time.Second
 // Information about an ongoing search.
 // Includes the targed NodeID, the bitmask to match it to an IP, and the list of nodes to visit / already visited.
 type searchInfo struct {
-	dest    NodeID
+	dest    crypto.NodeID
-	mask    NodeID
+	mask    crypto.NodeID
 	time    time.Time
 	packet  []byte
 	toVisit []*dhtInfo
-	visited map[NodeID]bool
+	visited map[crypto.NodeID]bool
 }
 
 // This stores a map of active searches.
 type searches struct {
 	core     *Core
-	searches map[NodeID]*searchInfo
+	searches map[crypto.NodeID]*searchInfo
 }
 
 // Intializes the searches struct.
 func (s *searches) init(core *Core) {
 	s.core = core
-	s.searches = make(map[NodeID]*searchInfo)
+	s.searches = make(map[crypto.NodeID]*searchInfo)
 }
 
 // Creates a new search info, adds it to the searches struct, and returns a pointer to the info.
-func (s *searches) createSearch(dest *NodeID, mask *NodeID) *searchInfo {
+func (s *searches) createSearch(dest *crypto.NodeID, mask *crypto.NodeID) *searchInfo {
 	now := time.Now()
 	for dest, sinfo := range s.searches {
 		if now.Sub(sinfo.time) > time.Minute {
@@ -102,7 +104,7 @@ func (s *searches) addToSearch(sinfo *searchInfo, res *dhtRes) {
 		}
 	}
 	// Deduplicate
-	vMap := make(map[NodeID]*dhtInfo)
+	vMap := make(map[crypto.NodeID]*dhtInfo)
 	for _, info := range sinfo.toVisit {
 		vMap[*info.getNodeID()] = info
 	}
@@ -163,10 +165,10 @@ func (s *searches) continueSearch(sinfo *searchInfo) {
 }
 
 // Calls create search, and initializes the iterative search parts of the struct before returning it.
-func (s *searches) newIterSearch(dest *NodeID, mask *NodeID) *searchInfo {
+func (s *searches) newIterSearch(dest *crypto.NodeID, mask *crypto.NodeID) *searchInfo {
 	sinfo := s.createSearch(dest, mask)
 	sinfo.toVisit = s.core.dht.lookup(dest, true)
-	sinfo.visited = make(map[NodeID]bool)
+	sinfo.visited = make(map[crypto.NodeID]bool)
 	return sinfo
 }
 
@@ -174,10 +176,10 @@ func (s *searches) newIterSearch(dest *NodeID, mask *NodeID) *searchInfo {
 // If the response is from the target, get/create a session, trigger a session ping, and return true.
 // Otherwise return false.
 func (s *searches) checkDHTRes(info *searchInfo, res *dhtRes) bool {
-	them := getNodeID(&res.Key)
+	them := crypto.GetNodeID(&res.Key)
-	var destMasked NodeID
+	var destMasked crypto.NodeID
-	var themMasked NodeID
+	var themMasked crypto.NodeID
-	for idx := 0; idx < NodeIDLen; idx++ {
+	for idx := 0; idx < crypto.NodeIDLen; idx++ {
 		destMasked[idx] = info.dest[idx] & info.mask[idx]
 		themMasked[idx] = them[idx] & info.mask[idx]
 	}

src/yggdrasil/session.go

@@ -8,23 +8,27 @@ import (
 	"bytes"
 	"encoding/hex"
 	"time"
+
+	"github.com/yggdrasil-network/yggdrasil-go/src/address"
+	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
+	"github.com/yggdrasil-network/yggdrasil-go/src/util"
 )
 
 // All the information we know about an active session.
 // This includes coords, permanent and ephemeral keys, handles and nonces, various sorts of timing information for timeout and maintenance, and some metadata for the admin API.
 type sessionInfo struct {
 	core         *Core
-	theirAddr    address
+	theirAddr    address.Address
-	theirSubnet  subnet
+	theirSubnet  address.Subnet
-	theirPermPub boxPubKey
+	theirPermPub crypto.BoxPubKey
-	theirSesPub  boxPubKey
+	theirSesPub  crypto.BoxPubKey
-	mySesPub     boxPubKey
+	mySesPub     crypto.BoxPubKey
-	mySesPriv    boxPrivKey
+	mySesPriv    crypto.BoxPrivKey
-	sharedSesKey boxSharedKey // derived from session keys
+	sharedSesKey crypto.BoxSharedKey // derived from session keys
-	theirHandle  handle
+	theirHandle  crypto.Handle
-	myHandle     handle
+	myHandle     crypto.Handle
-	theirNonce   boxNonce
+	theirNonce   crypto.BoxNonce
-	myNonce      boxNonce
+	myNonce      crypto.BoxNonce
 	theirMTU     uint16
 	myMTU        uint16
 	wasMTUFixed  bool      // Was the MTU fixed by a receive error?
@@ -45,9 +49,9 @@ type sessionInfo struct {
 
 // Represents a session ping/pong packet, andincludes information like public keys, a session handle, coords, a timestamp to prevent replays, and the tun/tap MTU.
 type sessionPing struct {
-	SendPermPub boxPubKey // Sender's permanent key
+	SendPermPub crypto.BoxPubKey // Sender's permanent key
-	Handle      handle    // Random number to ID session
+	Handle      crypto.Handle    // Random number to ID session
-	SendSesPub  boxPubKey // Session key to use
+	SendSesPub  crypto.BoxPubKey // Session key to use
 	Coords      []byte
 	Tstamp      int64 // unix time, but the only real requirement is that it increases
 	IsPong      bool
@@ -69,8 +73,8 @@ func (s *sessionInfo) update(p *sessionPing) bool {
 	if p.SendSesPub != s.theirSesPub {
 		s.theirSesPub = p.SendSesPub
 		s.theirHandle = p.Handle
-		s.sharedSesKey = *getSharedKey(&s.mySesPriv, &s.theirSesPub)
+		s.sharedSesKey = *crypto.GetSharedKey(&s.mySesPriv, &s.theirSesPub)
-		s.theirNonce = boxNonce{}
+		s.theirNonce = crypto.BoxNonce{}
 		s.nonceMask = 0
 	}
 	if p.MTU >= 1280 || p.MTU == 0 {
@@ -99,15 +103,15 @@ type sessions struct {
 	core        *Core
 	lastCleanup time.Time
 	// Maps known permanent keys to their shared key, used by DHT a lot
-	permShared map[boxPubKey]*boxSharedKey
+	permShared map[crypto.BoxPubKey]*crypto.BoxSharedKey
 	// Maps (secret) handle onto session info
-	sinfos map[handle]*sessionInfo
+	sinfos map[crypto.Handle]*sessionInfo
 	// Maps mySesPub onto handle
-	byMySes map[boxPubKey]*handle
+	byMySes map[crypto.BoxPubKey]*crypto.Handle
 	// Maps theirPermPub onto handle
-	byTheirPerm  map[boxPubKey]*handle
+	byTheirPerm  map[crypto.BoxPubKey]*crypto.Handle
-	addrToPerm   map[address]*boxPubKey
+	addrToPerm   map[address.Address]*crypto.BoxPubKey
-	subnetToPerm map[subnet]*boxPubKey
+	subnetToPerm map[address.Subnet]*crypto.BoxPubKey
 	// Options from the session firewall
 	sessionFirewallEnabled              bool
 	sessionFirewallAllowsDirect         bool
@@ -120,12 +124,12 @@ type sessions struct {
 // Initializes the session struct.
 func (ss *sessions) init(core *Core) {
 	ss.core = core
-	ss.permShared = make(map[boxPubKey]*boxSharedKey)
+	ss.permShared = make(map[crypto.BoxPubKey]*crypto.BoxSharedKey)
-	ss.sinfos = make(map[handle]*sessionInfo)
+	ss.sinfos = make(map[crypto.Handle]*sessionInfo)
-	ss.byMySes = make(map[boxPubKey]*handle)
+	ss.byMySes = make(map[crypto.BoxPubKey]*crypto.Handle)
-	ss.byTheirPerm = make(map[boxPubKey]*handle)
+	ss.byTheirPerm = make(map[crypto.BoxPubKey]*crypto.Handle)
-	ss.addrToPerm = make(map[address]*boxPubKey)
+	ss.addrToPerm = make(map[address.Address]*crypto.BoxPubKey)
-	ss.subnetToPerm = make(map[subnet]*boxPubKey)
+	ss.subnetToPerm = make(map[address.Subnet]*crypto.BoxPubKey)
 	ss.lastCleanup = time.Now()
 }
 
@@ -154,18 +158,18 @@ func (ss *sessions) setSessionFirewallBlacklist(blacklist []string) {
 
 // Determines whether the session with a given publickey is allowed based on
 // session firewall rules.
-func (ss *sessions) isSessionAllowed(pubkey *boxPubKey, initiator bool) bool {
+func (ss *sessions) isSessionAllowed(pubkey *crypto.BoxPubKey, initiator bool) bool {
 	// Allow by default if the session firewall is disabled
 	if !ss.sessionFirewallEnabled {
 		return true
 	}
 	// Prepare for checking whitelist/blacklist
-	var box boxPubKey
+	var box crypto.BoxPubKey
 	// Reject blacklisted nodes
 	for _, b := range ss.sessionFirewallBlacklist {
 		key, err := hex.DecodeString(b)
 		if err == nil {
-			copy(box[:boxPubKeyLen], key)
+			copy(box[:crypto.BoxPubKeyLen], key)
 			if box == *pubkey {
 				return false
 			}
@@ -175,7 +179,7 @@ func (ss *sessions) isSessionAllowed(pubkey *boxPubKey, initiator bool) bool {
 	for _, b := range ss.sessionFirewallWhitelist {
 		key, err := hex.DecodeString(b)
 		if err == nil {
-			copy(box[:boxPubKeyLen], key)
+			copy(box[:crypto.BoxPubKeyLen], key)
 			if box == *pubkey {
 				return true
 			}
@@ -208,7 +212,7 @@ func (ss *sessions) isSessionAllowed(pubkey *boxPubKey, initiator bool) bool {
 }
 
 // Gets the session corresponding to a given handle.
-func (ss *sessions) getSessionForHandle(handle *handle) (*sessionInfo, bool) {
+func (ss *sessions) getSessionForHandle(handle *crypto.Handle) (*sessionInfo, bool) {
 	sinfo, isIn := ss.sinfos[*handle]
 	if isIn && sinfo.timedout() {
 		// We have a session, but it has timed out
@@ -218,7 +222,7 @@ func (ss *sessions) getSessionForHandle(handle *handle) (*sessionInfo, bool) {
 }
 
 // Gets a session corresponding to an ephemeral session key used by this node.
-func (ss *sessions) getByMySes(key *boxPubKey) (*sessionInfo, bool) {
+func (ss *sessions) getByMySes(key *crypto.BoxPubKey) (*sessionInfo, bool) {
 	h, isIn := ss.byMySes[*key]
 	if !isIn {
 		return nil, false
@@ -228,7 +232,7 @@ func (ss *sessions) getByMySes(key *boxPubKey) (*sessionInfo, bool) {
 }
 
 // Gets a session corresponding to a permanent key used by the remote node.
-func (ss *sessions) getByTheirPerm(key *boxPubKey) (*sessionInfo, bool) {
+func (ss *sessions) getByTheirPerm(key *crypto.BoxPubKey) (*sessionInfo, bool) {
 	h, isIn := ss.byTheirPerm[*key]
 	if !isIn {
 		return nil, false
@@ -238,7 +242,7 @@ func (ss *sessions) getByTheirPerm(key *boxPubKey) (*sessionInfo, bool) {
 }
 
 // Gets a session corresponding to an IPv6 address used by the remote node.
-func (ss *sessions) getByTheirAddr(addr *address) (*sessionInfo, bool) {
+func (ss *sessions) getByTheirAddr(addr *address.Address) (*sessionInfo, bool) {
 	p, isIn := ss.addrToPerm[*addr]
 	if !isIn {
 		return nil, false
@@ -248,7 +252,7 @@ func (ss *sessions) getByTheirAddr(addr *address) (*sessionInfo, bool) {
 }
 
 // Gets a session corresponding to an IPv6 /64 subnet used by the remote node/network.
-func (ss *sessions) getByTheirSubnet(snet *subnet) (*sessionInfo, bool) {
+func (ss *sessions) getByTheirSubnet(snet *address.Subnet) (*sessionInfo, bool) {
 	p, isIn := ss.subnetToPerm[*snet]
 	if !isIn {
 		return nil, false
@@ -259,7 +263,7 @@ func (ss *sessions) getByTheirSubnet(snet *subnet) (*sessionInfo, bool) {
 
 // Creates a new session and lazily cleans up old/timedout existing sessions.
 // This includse initializing session info to sane defaults (e.g. lowest supported MTU).
-func (ss *sessions) createSession(theirPermKey *boxPubKey) *sessionInfo {
+func (ss *sessions) createSession(theirPermKey *crypto.BoxPubKey) *sessionInfo {
 	if ss.sessionFirewallEnabled {
 		if !ss.isSessionAllowed(theirPermKey, true) {
 			return nil
@@ -268,10 +272,10 @@ func (ss *sessions) createSession(theirPermKey *boxPubKey) *sessionInfo {
 	sinfo := sessionInfo{}
 	sinfo.core = ss.core
 	sinfo.theirPermPub = *theirPermKey
-	pub, priv := newBoxKeys()
+	pub, priv := crypto.NewBoxKeys()
 	sinfo.mySesPub = *pub
 	sinfo.mySesPriv = *priv
-	sinfo.myNonce = *newBoxNonce()
+	sinfo.myNonce = *crypto.NewBoxNonce()
 	sinfo.theirMTU = 1280
 	sinfo.myMTU = uint16(ss.core.router.tun.mtu)
 	now := time.Now()
@@ -295,9 +299,9 @@ func (ss *sessions) createSession(theirPermKey *boxPubKey) *sessionInfo {
 		// lower => even nonce
 		sinfo.myNonce[len(sinfo.myNonce)-1] &= 0xfe
 	}
-	sinfo.myHandle = *newHandle()
+	sinfo.myHandle = *crypto.NewHandle()
-	sinfo.theirAddr = *address_addrForNodeID(getNodeID(&sinfo.theirPermPub))
+	sinfo.theirAddr = *address.AddrForNodeID(crypto.GetNodeID(&sinfo.theirPermPub))
-	sinfo.theirSubnet = *address_subnetForNodeID(getNodeID(&sinfo.theirPermPub))
+	sinfo.theirSubnet = *address.SubnetForNodeID(crypto.GetNodeID(&sinfo.theirPermPub))
 	sinfo.send = make(chan []byte, 32)
 	sinfo.recv = make(chan *wire_trafficPacket, 32)
 	go sinfo.doWorker()
@@ -324,32 +328,32 @@ func (ss *sessions) cleanup() {
 			s.close()
 		}
 	}
-	permShared := make(map[boxPubKey]*boxSharedKey, len(ss.permShared))
+	permShared := make(map[crypto.BoxPubKey]*crypto.BoxSharedKey, len(ss.permShared))
 	for k, v := range ss.permShared {
 		permShared[k] = v
 	}
 	ss.permShared = permShared
-	sinfos := make(map[handle]*sessionInfo, len(ss.sinfos))
+	sinfos := make(map[crypto.Handle]*sessionInfo, len(ss.sinfos))
 	for k, v := range ss.sinfos {
 		sinfos[k] = v
 	}
 	ss.sinfos = sinfos
-	byMySes := make(map[boxPubKey]*handle, len(ss.byMySes))
+	byMySes := make(map[crypto.BoxPubKey]*crypto.Handle, len(ss.byMySes))
 	for k, v := range ss.byMySes {
 		byMySes[k] = v
 	}
 	ss.byMySes = byMySes
-	byTheirPerm := make(map[boxPubKey]*handle, len(ss.byTheirPerm))
+	byTheirPerm := make(map[crypto.BoxPubKey]*crypto.Handle, len(ss.byTheirPerm))
 	for k, v := range ss.byTheirPerm {
 		byTheirPerm[k] = v
 	}
 	ss.byTheirPerm = byTheirPerm
-	addrToPerm := make(map[address]*boxPubKey, len(ss.addrToPerm))
+	addrToPerm := make(map[address.Address]*crypto.BoxPubKey, len(ss.addrToPerm))
 	for k, v := range ss.addrToPerm {
 		addrToPerm[k] = v
 	}
 	ss.addrToPerm = addrToPerm
-	subnetToPerm := make(map[subnet]*boxPubKey, len(ss.subnetToPerm))
+	subnetToPerm := make(map[address.Subnet]*crypto.BoxPubKey, len(ss.subnetToPerm))
 	for k, v := range ss.subnetToPerm {
 		subnetToPerm[k] = v
 	}
@@ -380,15 +384,15 @@ func (ss *sessions) getPing(sinfo *sessionInfo) sessionPing {
 		Coords:      coords,
 		MTU:         sinfo.myMTU,
 	}
-	sinfo.myNonce.update()
+	sinfo.myNonce.Increment()
 	return ref
 }
 
 // Gets the shared key for a pair of box keys.
 // Used to cache recently used shared keys for protocol traffic.
 // This comes up with dht req/res and session ping/pong traffic.
-func (ss *sessions) getSharedKey(myPriv *boxPrivKey,
+func (ss *sessions) getSharedKey(myPriv *crypto.BoxPrivKey,
-	theirPub *boxPubKey) *boxSharedKey {
+	theirPub *crypto.BoxPubKey) *crypto.BoxSharedKey {
 	if skey, isIn := ss.permShared[*theirPub]; isIn {
 		return skey
 	}
@@ -401,7 +405,7 @@ func (ss *sessions) getSharedKey(myPriv *boxPrivKey,
 		}
 		delete(ss.permShared, key)
 	}
-	ss.permShared[*theirPub] = getSharedKey(myPriv, theirPub)
+	ss.permShared[*theirPub] = crypto.GetSharedKey(myPriv, theirPub)
 	return ss.permShared[*theirPub]
 }
 
@@ -417,7 +421,7 @@ func (ss *sessions) sendPingPong(sinfo *sessionInfo, isPong bool) {
 	ping.IsPong = isPong
 	bs := ping.encode()
 	shared := ss.getSharedKey(&ss.core.boxPriv, &sinfo.theirPermPub)
-	payload, nonce := boxSeal(shared, bs, nil)
+	payload, nonce := crypto.BoxSeal(shared, bs, nil)
 	p := wire_protoTrafficPacket{
 		Coords:  sinfo.coords,
 		ToKey:   sinfo.theirPermPub,
@@ -468,24 +472,6 @@ func (ss *sessions) handlePing(ping *sessionPing) {
 	}
 }
 
-// Used to subtract one nonce from another, staying in the range +- 64.
-// This is used by the nonce progression machinery to advance the bitmask of recently received packets (indexed by nonce), or to check the appropriate bit of the bitmask.
-// It's basically part of the machinery that prevents replays and duplicate packets.
-func (n *boxNonce) minus(m *boxNonce) int64 {
-	diff := int64(0)
-	for idx := range n {
-		diff *= 256
-		diff += int64(n[idx]) - int64(m[idx])
-		if diff > 64 {
-			diff = 64
-		}
-		if diff < -64 {
-			diff = -64
-		}
-	}
-	return diff
-}
-
 // Get the MTU of the session.
 // Will be equal to the smaller of this node's MTU or the remote node's MTU.
 // If sending over links with a maximum message size (this was a thing with the old UDP code), it could be further lowered, to a minimum of 1280.
@@ -500,9 +486,9 @@ func (sinfo *sessionInfo) getMTU() uint16 {
 }
 
 // Checks if a packet's nonce is recent enough to fall within the window of allowed packets, and not already received.
-func (sinfo *sessionInfo) nonceIsOK(theirNonce *boxNonce) bool {
+func (sinfo *sessionInfo) nonceIsOK(theirNonce *crypto.BoxNonce) bool {
 	// The bitmask is to allow for some non-duplicate out-of-order packets
-	diff := theirNonce.minus(&sinfo.theirNonce)
+	diff := theirNonce.Minus(&sinfo.theirNonce)
 	if diff > 0 {
 		return true
 	}
@@ -510,10 +496,10 @@ func (sinfo *sessionInfo) nonceIsOK(theirNonce *boxNonce) bool {
 }
 
 // Updates the nonce mask by (possibly) shifting the bitmask and setting the bit corresponding to this nonce to 1, and then updating the most recent nonce
-func (sinfo *sessionInfo) updateNonce(theirNonce *boxNonce) {
+func (sinfo *sessionInfo) updateNonce(theirNonce *crypto.BoxNonce) {
 	// Shift nonce mask if needed
 	// Set bit
-	diff := theirNonce.minus(&sinfo.theirNonce)
+	diff := theirNonce.Minus(&sinfo.theirNonce)
 	if diff > 0 {
 		// This nonce is newer, so shift the window before setting the bit, and update theirNonce in the session info.
 		sinfo.nonceMask <<= uint64(diff)
@@ -559,7 +545,7 @@ func (sinfo *sessionInfo) doWorker() {
 
 // This encrypts a packet, creates a trafficPacket struct, encodes it, and sends it to router.out to pass it to the switch layer.
 func (sinfo *sessionInfo) doSend(bs []byte) {
-	defer util_putBytes(bs)
+	defer util.PutBytes(bs)
 	if !sinfo.init {
 		// To prevent using empty session keys
 		return
@@ -593,8 +579,8 @@ func (sinfo *sessionInfo) doSend(bs []byte) {
 		coords = wire_put_uint64(flowkey, coords) // Then variable-length encoded flowkey
 	}
 	// Prepare the payload
-	payload, nonce := boxSeal(&sinfo.sharedSesKey, bs, &sinfo.myNonce)
+	payload, nonce := crypto.BoxSeal(&sinfo.sharedSesKey, bs, &sinfo.myNonce)
-	defer util_putBytes(payload)
+	defer util.PutBytes(payload)
 	p := wire_trafficPacket{
 		Coords:  coords,
 		Handle:  sinfo.theirHandle,
@@ -612,13 +598,13 @@ func (sinfo *sessionInfo) doSend(bs []byte) {
 // If a packet does not decrypt successfully, it assumes the packet was truncated, and updates the MTU accordingly.
 // TODO? remove the MTU updating part? That should never happen with TCP peers, and the old UDP code that caused it was removed (and if replaced, should be replaced with something that can reliably send messages with an arbitrary size).
 func (sinfo *sessionInfo) doRecv(p *wire_trafficPacket) {
-	defer util_putBytes(p.Payload)
+	defer util.PutBytes(p.Payload)
 	if !sinfo.nonceIsOK(&p.Nonce) {
 		return
 	}
-	bs, isOK := boxOpen(&sinfo.sharedSesKey, p.Payload, &p.Nonce)
+	bs, isOK := crypto.BoxOpen(&sinfo.sharedSesKey, p.Payload, &p.Nonce)
 	if !isOK {
-		util_putBytes(bs)
+		util.PutBytes(bs)
 		return
 	}
 	sinfo.updateNonce(&p.Nonce)

src/yggdrasil/switch.go

@@ -16,6 +16,9 @@ import (
 	"sync"
 	"sync/atomic"
 	"time"
+
+	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
+	"github.com/yggdrasil-network/yggdrasil-go/src/util"
 )
 
 const (
@@ -30,16 +33,16 @@ const (
 // The coords represent a path from the root to a node.
 // This path is generally part of a spanning tree, except possibly the last hop (it can loop when sending coords to your parent, but they see this and know not to use a looping path).
 type switchLocator struct {
-	root   sigPubKey
+	root   crypto.SigPubKey
 	tstamp int64
 	coords []switchPort
 }
 
 // Returns true if the first sigPubKey has a higher TreeID.
-func firstIsBetter(first, second *sigPubKey) bool {
+func firstIsBetter(first, second *crypto.SigPubKey) bool {
 	// Higher TreeID is better
-	ftid := getTreeID(first)
+	ftid := crypto.GetTreeID(first)
-	stid := getTreeID(second)
+	stid := crypto.GetTreeID(second)
 	for idx := 0; idx < len(ftid); idx++ {
 		if ftid[idx] == stid[idx] {
 			continue
@@ -121,7 +124,7 @@ func (x *switchLocator) isAncestorOf(y *switchLocator) bool {
 
 // Information about a peer, used by the switch to build the tree and eventually make routing decisions.
 type peerInfo struct {
-	key     sigPubKey             // ID of this peer
+	key     crypto.SigPubKey      // ID of this peer
 	locator switchLocator         // Should be able to respond with signatures upon request
 	degree  uint64                // Self-reported degree
 	time    time.Time             // Time this node was last seen
@@ -159,26 +162,26 @@ type switchData struct {
 // All the information stored by the switch.
 type switchTable struct {
 	core              *Core
-	key               sigPubKey           // Our own key
+	key               crypto.SigPubKey           // Our own key
-	time              time.Time           // Time when locator.tstamp was last updated
+	time              time.Time                  // Time when locator.tstamp was last updated
-	drop              map[sigPubKey]int64 // Tstamp associated with a dropped root
+	drop              map[crypto.SigPubKey]int64 // Tstamp associated with a dropped root
-	mutex             sync.RWMutex        // Lock for reads/writes of switchData
+	mutex             sync.RWMutex               // Lock for reads/writes of switchData
-	parent            switchPort          // Port of whatever peer is our parent, or self if we're root
+	parent            switchPort                 // Port of whatever peer is our parent, or self if we're root
-	data              switchData          //
+	data              switchData                 //
-	updater           atomic.Value        // *sync.Once
+	updater           atomic.Value               // *sync.Once
-	table             atomic.Value        // lookupTable
+	table             atomic.Value               // lookupTable
-	packetIn          chan []byte         // Incoming packets for the worker to handle
+	packetIn          chan []byte                // Incoming packets for the worker to handle
-	idleIn            chan switchPort     // Incoming idle notifications from peer links
+	idleIn            chan switchPort            // Incoming idle notifications from peer links
-	admin             chan func()         // Pass a lambda for the admin socket to query stuff
+	admin             chan func()                // Pass a lambda for the admin socket to query stuff
-	queues            switch_buffers      // Queues - not atomic so ONLY use through admin chan
+	queues            switch_buffers             // Queues - not atomic so ONLY use through admin chan
-	queueTotalMaxSize uint64              // Maximum combined size of queues
+	queueTotalMaxSize uint64                     // Maximum combined size of queues
 }
 
 // Minimum allowed total size of switch queues.
 const SwitchQueueTotalMinSize = 4 * 1024 * 1024
 
 // Initializes the switchTable struct.
-func (t *switchTable) init(core *Core, key sigPubKey) {
+func (t *switchTable) init(core *Core, key crypto.SigPubKey) {
 	now := time.Now()
 	t.core = core
 	t.key = key
@@ -187,7 +190,7 @@ func (t *switchTable) init(core *Core, key sigPubKey) {
 	t.data = switchData{locator: locator, peers: peers}
 	t.updater.Store(&sync.Once{})
 	t.table.Store(lookupTable{})
-	t.drop = make(map[sigPubKey]int64)
+	t.drop = make(map[crypto.SigPubKey]int64)
 	t.packetIn = make(chan []byte, 1024)
 	t.idleIn = make(chan switchPort, 1024)
 	t.admin = make(chan func())
@@ -302,7 +305,7 @@ func (t *switchTable) cleanDropped() {
 // This is exchanged with peers to construct the spanning tree.
 // A subset of this information, excluding the signatures, is used to construct locators that are used elsewhere in the code.
 type switchMsg struct {
-	Root   sigPubKey
+	Root   crypto.SigPubKey
 	TStamp int64
 	Hops   []switchMsgHop
 }
@@ -310,8 +313,8 @@ type switchMsg struct {
 // This represents the signed information about the path leading from the root the Next node, via the Port specified here.
 type switchMsgHop struct {
 	Port switchPort
-	Next sigPubKey
+	Next crypto.SigPubKey
-	Sig  sigBytes
+	Sig  crypto.SigBytes
 }
 
 // This returns a *switchMsg to a copy of this node's current switchMsg, which can safely have additional information appended to Hops and sent to a peer.
@@ -690,7 +693,7 @@ func (b *switch_buffers) cleanup(t *switchTable) {
 		coords := switch_getPacketCoords(packet.bytes)
 		if t.selfIsClosest(coords) {
 			for _, packet := range buf.packets {
-				util_putBytes(packet.bytes)
+				util.PutBytes(packet.bytes)
 			}
 			b.size -= buf.size
 			delete(b.bufs, streamID)
@@ -710,7 +713,7 @@ func (b *switch_buffers) cleanup(t *switchTable) {
 			packet, buf.packets = buf.packets[0], buf.packets[1:]
 			buf.size -= uint64(len(packet.bytes))
 			b.size -= uint64(len(packet.bytes))
-			util_putBytes(packet.bytes)
+			util.PutBytes(packet.bytes)
 			if len(buf.packets) == 0 {
 				delete(b.bufs, streamID)
 			} else {

src/yggdrasil/tcp.go

@@ -25,6 +25,10 @@ import (
 	"time"
 
 	"golang.org/x/net/proxy"
+
+	"github.com/yggdrasil-network/yggdrasil-go/src/address"
+	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
+	"github.com/yggdrasil-network/yggdrasil-go/src/util"
 )
 
 const tcp_msgSize = 2048 + 65535 // TODO figure out what makes sense
@@ -44,8 +48,8 @@ type tcpInterface struct {
 // This is used as the key to a map that tracks existing connections, to prevent multiple connections to the same keys and local/remote address pair from occuring.
 // Different address combinations are allowed, so multi-homing is still technically possible (but not necessarily advisable).
 type tcpInfo struct {
-	box        boxPubKey
+	box        crypto.BoxPubKey
-	sig        sigPubKey
+	sig        crypto.SigPubKey
 	localAddr  string
 	remoteAddr string
 }
@@ -211,7 +215,7 @@ func (iface *tcpInterface) handler(sock net.Conn, incoming bool) {
 	defer sock.Close()
 	iface.setExtraOptions(sock)
 	// Get our keys
-	myLinkPub, myLinkPriv := newBoxKeys() // ephemeral link keys
+	myLinkPub, myLinkPriv := crypto.NewBoxKeys() // ephemeral link keys
 	meta := version_getBaseMetadata()
 	meta.box = iface.core.boxPub
 	meta.sig = iface.core.sigPub
@@ -292,7 +296,7 @@ func (iface *tcpInterface) handler(sock net.Conn, incoming bool) {
 	}()
 	// Note that multiple connections to the same node are allowed
 	//  E.g. over different interfaces
-	p := iface.core.peers.newPeer(&info.box, &info.sig, getSharedKey(myLinkPriv, &meta.link), sock.RemoteAddr().String())
+	p := iface.core.peers.newPeer(&info.box, &info.sig, crypto.GetSharedKey(myLinkPriv, &meta.link), sock.RemoteAddr().String())
 	p.linkOut = make(chan []byte, 1)
 	in := func(bs []byte) {
 		p.handlePacket(bs)
@@ -306,7 +310,7 @@ func (iface *tcpInterface) handler(sock net.Conn, incoming bool) {
 			buf := net.Buffers{tcp_msg[:], msgLen, msg}
 			buf.WriteTo(sock)
 			atomic.AddUint64(&p.bytesSent, uint64(len(tcp_msg)+len(msgLen)+len(msg)))
-			util_putBytes(msg)
+			util.PutBytes(msg)
 		}
 		timerInterval := tcp_ping_interval
 		timer := time.NewTimer(timerInterval)
@@ -354,8 +358,8 @@ func (iface *tcpInterface) handler(sock net.Conn, incoming bool) {
 	}()
 	us, _, _ := net.SplitHostPort(sock.LocalAddr().String())
 	them, _, _ := net.SplitHostPort(sock.RemoteAddr().String())
-	themNodeID := getNodeID(&info.box)
+	themNodeID := crypto.GetNodeID(&info.box)
-	themAddr := address_addrForNodeID(themNodeID)
+	themAddr := address.AddrForNodeID(themNodeID)
 	themAddrString := net.IP(themAddr[:]).String()
 	themString := fmt.Sprintf("%s@%s", themAddrString, them)
 	iface.core.log.Println("Connected:", themString, "source", us)
@@ -390,9 +394,9 @@ func (iface *tcpInterface) reader(sock net.Conn, in func([]byte)) error {
 					// We didn't get the whole message yet
 					break
 				}
-				newMsg := append(util_getBytes(), msg...)
+				newMsg := append(util.GetBytes(), msg...)
 				in(newMsg)
-				util_yield()
+				util.Yield()
 			}
 			frag = append(bs[:0], frag...)
 		}

src/yggdrasil/tun.go

@@ -10,7 +10,9 @@ import (
 	"github.com/songgao/packets/ethernet"
 	"github.com/yggdrasil-network/water"
 
+	"github.com/yggdrasil-network/yggdrasil-go/src/address"
 	"github.com/yggdrasil-network/yggdrasil-go/src/defaults"
+	"github.com/yggdrasil-network/yggdrasil-go/src/util"
 )
 
 const tun_IPv6_HEADER_LENGTH = 40
@@ -80,7 +82,7 @@ func (tun *tunAdapter) write() error {
 			continue
 		}
 		if tun.iface.IsTAP() {
-			var destAddr address
+			var destAddr address.Address
 			if data[0]&0xf0 == 0x60 {
 				if len(data) < 40 {
 					panic("Tried to send a packet shorter than an IPv6 header...")
@@ -94,7 +96,7 @@ func (tun *tunAdapter) write() error {
 			} else {
 				return errors.New("Invalid address family")
 			}
-			sendndp := func(destAddr address) {
+			sendndp := func(destAddr address.Address) {
 				neigh, known := tun.icmpv6.peermacs[destAddr]
 				known = known && (time.Since(neigh.lastsolicitation).Seconds() < 30)
 				if !known {
@@ -154,7 +156,7 @@ func (tun *tunAdapter) write() error {
 				panic(err)
 			}
 		}
-		util_putBytes(data)
+		util.PutBytes(data)
 	}
 }
 
@@ -191,7 +193,7 @@ func (tun *tunAdapter) read() error {
 			// tun.icmpv6.recv <- b
 			go tun.icmpv6.parse_packet(b)
 		}
-		packet := append(util_getBytes(), buf[o:n]...)
+		packet := append(util.GetBytes(), buf[o:n]...)
 		tun.send <- packet
 	}
 }

src/yggdrasil/version.go

@@ -4,6 +4,8 @@ package yggdrasil
 // Used in the inital connection setup and key exchange
 // Some of this could arguably go in wire.go instead
 
+import "github.com/yggdrasil-network/yggdrasil-go/src/crypto"
+
 // This is the version-specific metadata exchanged at the start of a connection.
 // It must always beign with the 4 bytes "meta" and a wire formatted uint64 major version number.
 // The current version also includes a minor version number, and the box/sig/link keys that need to be exchanged to open an connection.
@@ -12,9 +14,9 @@ type version_metadata struct {
 	ver  uint64 // 1 byte in this version
 	// Everything after this point potentially depends on the version number, and is subject to change in future versions
 	minorVer uint64 // 1 byte in this version
-	box      boxPubKey
+	box      crypto.BoxPubKey
-	sig      sigPubKey
+	sig      crypto.SigPubKey
-	link     boxPubKey
+	link     crypto.BoxPubKey
 }
 
 // Gets a base metadata with no keys set, but with the correct version numbers.
@@ -28,12 +30,12 @@ func version_getBaseMetadata() version_metadata {
 
 // Gest the length of the metadata for this version, used to know how many bytes to read from the start of a connection.
 func version_getMetaLength() (mlen int) {
-	mlen += 4            // meta
+	mlen += 4                   // meta
-	mlen += 1            // ver, as long as it's < 127, which it is in this version
+	mlen += 1                   // ver, as long as it's < 127, which it is in this version
-	mlen += 1            // minorVer, as long as it's < 127, which it is in this version
+	mlen += 1                   // minorVer, as long as it's < 127, which it is in this version
-	mlen += boxPubKeyLen // box
+	mlen += crypto.BoxPubKeyLen // box
-	mlen += sigPubKeyLen // sig
+	mlen += crypto.SigPubKeyLen // sig
-	mlen += boxPubKeyLen // link
+	mlen += crypto.BoxPubKeyLen // link
 	return
 }
 

src/yggdrasil/wire.go

@@ -7,6 +7,11 @@ package yggdrasil
 
 // Packet types, as wire_encode_uint64(type) at the start of each packet
 
+import (
+	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
+	"github.com/yggdrasil-network/yggdrasil-go/src/util"
+)
+
 const (
 	wire_Traffic             = iota // data being routed somewhere, handle for crypto
 	wire_ProtocolTraffic            // protocol traffic, pub keys for crypto
@@ -193,14 +198,14 @@ func wire_chop_uint64(toUInt64 *uint64, fromSlice *[]byte) bool {
 // The wire format for ordinary IPv6 traffic encapsulated by the network.
 type wire_trafficPacket struct {
 	Coords  []byte
-	Handle  handle
+	Handle  crypto.Handle
-	Nonce   boxNonce
+	Nonce   crypto.BoxNonce
 	Payload []byte
 }
 
 // Encodes a wire_trafficPacket into its wire format.
 func (p *wire_trafficPacket) encode() []byte {
-	bs := util_getBytes()
+	bs := util.GetBytes()
 	bs = wire_put_uint64(wire_Traffic, bs)
 	bs = wire_put_coords(p.Coords, bs)
 	bs = append(bs, p.Handle[:]...)
@@ -224,16 +229,16 @@ func (p *wire_trafficPacket) decode(bs []byte) bool {
 	case !wire_chop_slice(p.Nonce[:], &bs):
 		return false
 	}
-	p.Payload = append(util_getBytes(), bs...)
+	p.Payload = append(util.GetBytes(), bs...)
 	return true
 }
 
 // The wire format for protocol traffic, such as dht req/res or session ping/pong packets.
 type wire_protoTrafficPacket struct {
 	Coords  []byte
-	ToKey   boxPubKey
+	ToKey   crypto.BoxPubKey
-	FromKey boxPubKey
+	FromKey crypto.BoxPubKey
-	Nonce   boxNonce
+	Nonce   crypto.BoxNonce
 	Payload []byte
 }
 
@@ -275,7 +280,7 @@ func (p *wire_protoTrafficPacket) decode(bs []byte) bool {
 // The keys themselves are exchanged as part of the connection setup, and then omitted from the packets.
 // The two layer logic is handled in peers.go, but it's kind of ugly.
 type wire_linkProtoTrafficPacket struct {
-	Nonce   boxNonce
+	Nonce   crypto.BoxNonce
 	Payload []byte
 }