diff options
| -rw-r--r-- | crypto/chacha/chacha_enc.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/crypto/chacha/chacha_enc.c b/crypto/chacha/chacha_enc.c index 13720d0cc5..239f68ab82 100644 --- a/crypto/chacha/chacha_enc.c +++ b/crypto/chacha/chacha_enc.c @@ -110,8 +110,12 @@ void ChaCha20_ctr32(unsigned char *out, const unsigned char *inp, inp += todo; len -= todo; - /* advance counter */ - if (++input[12] == 0) - input[13]++; + /* + * Advance 32-bit counter. Note that as subroutine is so to + * say nonce-agnostic, this limited counter width doesn't + * prevent caller from implementing wider counter. It would + * simply take two calls split on counter overflow... + */ + input[12]++; } } |