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Add and use a constant-time memcmp.

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This change adds CRYPTO_memcmp, which compares two vectors of bytes in
an amount of time that's independent of their contents. It also changes
several MAC compares in the code to use this over the standard memcmp,
which may leak information about the size of a matching prefix.
This commit is contained in:
Ben Laurie
2013-01-28 17:30:38 +00:00
parent ffcf4c6164
commit 2ee798880a
9 changed files with 27 additions and 8 deletions
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2
ssl/s3_both.c
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@@ -265,7 +265,7 @@ int ssl3_get_finished(SSL *s, int a, int b)
goto f_err;
}
if (memcmp(p, s->s3->tmp.peer_finish_md, i) != 0)
if (CRYPTO_memcmp(p, s->s3->tmp.peer_finish_md, i) != 0)
{
al=SSL_AD_DECRYPT_ERROR;
SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);