yuzu/mbedtls
1
0
Fork 0
mirror of https://github.com/yuzu-emu/mbedtls.git synced 2024-10-18 14:21:06 +00:00
Code Issues Packages Projects Releases Wiki Activity

Check HMAC in constant-time in crypt_and_hash

Browse source
This commit is contained in:
Paul Bakker 2013-10-31 14:22:08 +01:00
parent 0d7702c3ee
commit 424cd6943c
1 changed files with 7 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
programs/aes/crypt_and_hash.c
View file

@ -76,6 +76,7 @@ int main( int argc, char *argv[] )
unsigned char digest[POLARSSL_MD_MAX_SIZE];
unsigned char buffer[1024];
unsigned char output[1024];
unsigned char diff;
const cipher_info_t *cipher_info;
const md_info_t *md_info;
@ -476,7 +477,12 @@ int main( int argc, char *argv[] )
goto exit;
}
if( memcmp( digest, buffer, md_get_size( md_info ) ) != 0 )
/* Use constant-time buffer comparison */
diff = 0;
for( i = 0; i < md_get_size( md_info ); i++ )
diff |= digest[i] ^ buffer[i];
if( diff != 0 )
{
fprintf( stderr, "HMAC check failed: wrong key, "
"or file corrupted.\n" );