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Make all hash checking in programs constant-time

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Manuel Pégourié-Gonnard 2013-10-28 12:51:32 +01:00 committed by Paul Bakker
parent 424cd6943c
commit 291f9af935
5 changed files with 35 additions and 5 deletions
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8
programs/aes/aescrypt2.c
View file

@ -75,6 +75,7 @@ int main( int argc, char *argv[] )
unsigned char key[512];
unsigned char digest[32];
unsigned char buffer[1024];
unsigned char diff;
aes_context aes_ctx;
sha256_context sha_ctx;
@ -397,7 +398,12 @@ int main( int argc, char *argv[] )
goto exit;
}
if( memcmp( digest, buffer, 32 ) != 0 )
/* Use constant-time buffer comparison */
diff = 0;
for( i = 0; i < 32; i++ )
diff |= digest[i] ^ buffer[i];
if( diff != 0 )
{
fprintf( stderr, "HMAC check failed: wrong key, "
"or file corrupted.\n" );

8
programs/hash/generic_sum.c
View file

@ -77,6 +77,7 @@ static int generic_check( const md_info_t *md_info, char *filename )
int nb_tot1, nb_tot2;
unsigned char sum[POLARSSL_MD_MAX_SIZE];
char buf[POLARSSL_MD_MAX_SIZE * 2 + 1], line[1024];
char diff;
if( ( f = fopen( filename, "rb" ) ) == NULL )
{
@ -123,7 +124,12 @@ static int generic_check( const md_info_t *md_info, char *filename )
for( i = 0; i < md_info->size; i++ )
sprintf( buf + i * 2, "%02x", sum[i] );
if( memcmp( line, buf, 2 * md_info->size ) != 0 )
/* Use constant-time buffer comparison */
diff = 0;
for( i = 0; i < 2 * md_info->size; i++ )
diff |= line[i] ^ buf[i];
if( diff != 0 )
{
nb_err2++;
fprintf( stderr, "wrong checksum: %s\n", line + 66 );

8
programs/hash/md5sum.c
View file

@ -77,6 +77,7 @@ static int md5_check( char *filename )
int nb_tot1, nb_tot2;
unsigned char sum[16];
char buf[33], line[1024];
char diff;
if( ( f = fopen( filename, "rb" ) ) == NULL )
{
@ -117,7 +118,12 @@ static int md5_check( char *filename )
for( i = 0; i < 16; i++ )
sprintf( buf + i * 2, "%02x", sum[i] );
if( memcmp( line, buf, 32 ) != 0 )
/* Use constant-time buffer comparison */
diff = 0;
for( i = 0; i < 32; i++ )
diff |= line[i] ^ buf[i];
if( diff != 0 )
{
nb_err2++;
fprintf( stderr, "wrong checksum: %s\n", line + 34 );

8
programs/hash/sha1sum.c
View file

@ -77,6 +77,7 @@ static int sha1_check( char *filename )
int nb_tot1, nb_tot2;
unsigned char sum[20];
char buf[41], line[1024];
char diff;
if( ( f = fopen( filename, "rb" ) ) == NULL )
{
@ -117,7 +118,12 @@ static int sha1_check( char *filename )
for( i = 0; i < 20; i++ )
sprintf( buf + i * 2, "%02x", sum[i] );
if( memcmp( line, buf, 40 ) != 0 )
/* Use constant-time buffer comparison */
diff = 0;
for( i = 0; i < 40; i++ )
diff |= line[i] ^ buf[i];
if( diff != 0 )
{
nb_err2++;
fprintf( stderr, "wrong checksum: %s\n", line + 42 );

8
programs/hash/sha2sum.c
View file

@ -77,6 +77,7 @@ static int sha256_check( char *filename )
int nb_tot1, nb_tot2;
unsigned char sum[32];
char buf[65], line[1024];
char diff;
if( ( f = fopen( filename, "rb" ) ) == NULL )
{
@ -117,7 +118,12 @@ static int sha256_check( char *filename )
for( i = 0; i < 32; i++ )
sprintf( buf + i * 2, "%02x", sum[i] );
if( memcmp( line, buf, 64 ) != 0 )
/* Use constant-time buffer comparison */
diff = 0;
for( i = 0; i < 64; i++ )
diff |= line[i] ^ buf[i];
if( diff != 0 )
{
nb_err2++;
fprintf( stderr, "wrong checksum: %s\n", line + 66 );