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adopt chacha20 implementation to upstream changes

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This commit is contained in:
Lucas Clemente
2016-04-16 20:46:33 +02:00
parent 3eabb4a46c
commit 7aec145d52
1 changed files with 8 additions and 8 deletions
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16
crypto/chacha20poly1305trunc12/chacha20poly1305.go
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@@ -47,16 +47,16 @@ func (c *aeadCipher) Seal(dst, nonce, plaintext, additionalData []byte) []byte {
if len(dst) < len(plaintext) {
panic("dst buffer to small")
}
var Nonce [12]byte
copy(Nonce[:], nonce)
// create the ploy1305 key
var polyKey [32]byte
var tmp [64]byte
chacha.XORKeyStream(tmp[:], c.key[:], nonce, 0, tmp[:])
copy(polyKey[:], tmp[:32])
chacha.XORKeyStream(polyKey[:], polyKey[:], &(c.key), &Nonce, 0)
// encrypt the plaintext
n := len(plaintext)
chacha.XORKeyStream(dst, c.key[:], nonce, 1, plaintext)
chacha.XORKeyStream(dst, plaintext, &(c.key), &Nonce, 1)
// authenticate the ciphertext
tag := authenticate(&polyKey, dst[:n], additionalData)
@@ -73,15 +73,15 @@ func (c *aeadCipher) Open(dst, nonce, ciphertext, additionalData []byte) ([]byte
if len(dst) < len(ciphertext)-12 {
panic("dst buffer to small")
}
var Nonce [12]byte
copy(Nonce[:], nonce)
hash := ciphertext[len(ciphertext)-12:]
ciphertext = ciphertext[:len(ciphertext)-12]
// create the ploy1305 key
var polyKey [32]byte
var tmp [64]byte
chacha.XORKeyStream(tmp[:], c.key[:], nonce, 0, tmp[:])
copy(polyKey[:], tmp[:32])
chacha.XORKeyStream(polyKey[:], polyKey[:], &(c.key), &Nonce, 0)
// authenticate the ciphertext
tag := authenticate(&polyKey, ciphertext, additionalData)
@@ -90,7 +90,7 @@ func (c *aeadCipher) Open(dst, nonce, ciphertext, additionalData []byte) ([]byte
}
// decrypt ciphertext
chacha.XORKeyStream(dst, c.key[:], nonce, 1, ciphertext)
chacha.XORKeyStream(dst, ciphertext, &(c.key), &Nonce, 1)
return dst[:len(ciphertext)], nil
}