diff options
Diffstat (limited to 'src/crypto/cipher/gcm.go')
| -rw-r--r-- | src/crypto/cipher/gcm.go | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/crypto/cipher/gcm.go b/src/crypto/cipher/gcm.go index cfc5769a80..62085aac0f 100644 --- a/src/crypto/cipher/gcm.go +++ b/src/crypto/cipher/gcm.go @@ -74,6 +74,10 @@ type gcm struct { // NewGCM returns the given 128-bit, block cipher wrapped in Galois Counter Mode // with the standard nonce length. +// +// In general, the GHASH operation performed by this implementation of GCM is not constant-time. +// An exception is when the underlying Block was created by aes.NewCipher +// on systems with hardware support for AES. See the crypto/aes package documentation for details. func NewGCM(cipher Block) (AEAD, error) { return NewGCMWithNonceSize(cipher, gcmStandardNonceSize) } @@ -184,7 +188,7 @@ func (g *gcm) Open(dst, nonce, ciphertext, data []byte) ([]byte, error) { if subtle.ConstantTimeCompare(expectedTag[:], tag) != 1 { // The AESNI code decrypts and authenticates concurrently, and // so overwrites dst in the event of a tag mismatch. That - // behaviour is mimicked here in order to be consistent across + // behavior is mimicked here in order to be consistent across // platforms. for i := range out { out[i] = 0 |