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48 lines
1.5 KiB
Go
48 lines
1.5 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package key defines some types related to curve25519 keys.
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package key
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import (
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"encoding/base64"
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"golang.org/x/crypto/curve25519"
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)
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// Private represents a curve25519 private key.
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type Private [32]byte
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// Private reports whether p is the zero value.
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func (p Private) IsZero() bool { return p == Private{} }
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// B32 returns k as the *[32]byte type that's used by the
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// golang.org/x/crypto packages. This allocates; it might
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// not be appropriate for performance-sensitive paths.
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func (k Private) B32() *[32]byte { return (*[32]byte)(&k) }
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// Public represents a curve25519 public key.
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type Public [32]byte
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// Public reports whether p is the zero value.
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func (p Public) IsZero() bool { return p == Public{} }
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// ShortString returns the Tailscale conventional debug representation
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// of a public key: the first five base64 digits of the key, in square
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// brackets.
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func (p Public) ShortString() string {
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return "[" + base64.StdEncoding.EncodeToString(p[:])[:5] + "]"
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}
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// B32 returns k as the *[32]byte type that's used by the
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// golang.org/x/crypto packages. This allocates; it might
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// not be appropriate for performance-sensitive paths.
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func (k Public) B32() *[32]byte { return (*[32]byte)(&k) }
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func (k Private) Public() Public {
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var pub [32]byte
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curve25519.ScalarBaseMult(&pub, (*[32]byte)(&k))
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return Public(pub)
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}
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