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Safer buffer comparisons in the SSL modules

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Manuel Pégourié-Gonnard 2013-10-28 13:46:11 +01:00 • committed by Paul Bakker
parent 291f9af935
commit 31ff1d2e4f
4 changed files with 41 additions and 17 deletions
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14
include/polarssl/ssl.h
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@ -1565,6 +1565,20 @@ static inline x509_crt *ssl_own_cert( ssl_context *ssl )
}
#endif /* POLARSSL_X509_CRT_PARSE_C */
/* constant-time buffer comparison */
static inline int safer_memcmp( const void *a, const void *b, size_t n )
{
size_t i;
const unsigned char *A = (const unsigned char *) a;
const unsigned char *B = (const unsigned char *) b;
unsigned char diff = 0;
for( i = 0; i < n; i++ )
diff |= A[i] ^ B[i];
return( diff );
}
#ifdef __cplusplus
}
#endif