mirror of
https://github.com/zitadel/zitadel.git
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137 lines
2.9 KiB
Go
137 lines
2.9 KiB
Go
package crypto
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"encoding/base64"
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"io"
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"github.com/caos/zitadel/internal/errors"
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)
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var _ EncryptionAlgorithm = (*AESCrypto)(nil)
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type AESCrypto struct {
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keys map[string]string
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encryptionKeyID string
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keyIDs []string
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}
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func NewAESCrypto(config *KeyConfig) (*AESCrypto, error) {
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keys, ids, err := LoadKeys(config)
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if err != nil {
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return nil, err
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}
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return &AESCrypto{
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keys: keys,
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encryptionKeyID: config.EncryptionKeyID,
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keyIDs: ids,
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}, nil
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}
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func (a *AESCrypto) Algorithm() string {
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return "aes"
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}
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func (a *AESCrypto) Encrypt(value []byte) ([]byte, error) {
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return EncryptAES(value, a.encryptionKey())
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}
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func (a *AESCrypto) Decrypt(value []byte, keyID string) ([]byte, error) {
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key, err := a.decryptionKey(keyID)
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if err != nil {
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return nil, err
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}
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return DecryptAES(value, key)
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}
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func (a *AESCrypto) DecryptString(value []byte, keyID string) (string, error) {
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key, err := a.decryptionKey(keyID)
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if err != nil {
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return "", err
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}
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b, err := DecryptAES(value, key)
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if err != nil {
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return "", err
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}
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return string(b), nil
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}
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func (a *AESCrypto) EncryptionKeyID() string {
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return a.encryptionKeyID
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}
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func (a *AESCrypto) DecryptionKeyIDs() []string {
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return a.keyIDs
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}
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func (a *AESCrypto) encryptionKey() string {
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return a.keys[a.encryptionKeyID]
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}
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func (a *AESCrypto) decryptionKey(keyID string) (string, error) {
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key, ok := a.keys[keyID]
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if !ok {
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return "", errors.ThrowNotFound(nil, "CRYPT-nkj1s", "unknown key id")
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}
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return key, nil
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}
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func EncryptAESString(data string, key string) (string, error) {
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encrypted, err := EncryptAES([]byte(data), key)
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if err != nil {
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return "", err
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}
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return base64.URLEncoding.EncodeToString(encrypted), nil
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}
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func EncryptAES(plainText []byte, key string) ([]byte, error) {
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block, err := aes.NewCipher([]byte(key))
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if err != nil {
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return nil, err
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}
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cipherText := make([]byte, aes.BlockSize+len(plainText))
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iv := cipherText[:aes.BlockSize]
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if _, err = io.ReadFull(rand.Reader, iv); err != nil {
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return nil, err
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}
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stream := cipher.NewCFBEncrypter(block, iv)
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stream.XORKeyStream(cipherText[aes.BlockSize:], plainText)
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return cipherText, nil
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}
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func DecryptAESString(data string, key string) (string, error) {
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text, err := base64.URLEncoding.DecodeString(data)
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if err != nil {
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return "", nil
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}
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decrypted, err := DecryptAES(text, key)
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if err != nil {
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return "", err
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}
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return string(decrypted), nil
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}
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func DecryptAES(cipherText []byte, key string) ([]byte, error) {
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block, err := aes.NewCipher([]byte(key))
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if err != nil {
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return nil, err
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}
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if len(cipherText) < aes.BlockSize {
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err = errors.ThrowPreconditionFailed(nil, "CRYPT-23kH1", "cipher text block too short")
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return nil, err
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}
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iv := cipherText[:aes.BlockSize]
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cipherText = cipherText[aes.BlockSize:]
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stream := cipher.NewCFBDecrypter(block, iv)
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stream.XORKeyStream(cipherText, cipherText)
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return cipherText, err
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}
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