Fixed CMAC tag length

This commit is contained in:
Brian Murray 2016-05-19 14:23:50 -07:00 committed by Simon Butcher
parent 029d79bf25
commit 3c0412a443

View file

@ -59,6 +59,7 @@ void mbedtls_cmac_init( mbedtls_cmac_context *ctx )
memset( ctx, 0, sizeof( mbedtls_cmac_context ) ); memset( ctx, 0, sizeof( mbedtls_cmac_context ) );
} }
/* /*
* Multiplication by u in the Galois field of GF(2^n) * Multiplication by u in the Galois field of GF(2^n)
* *
@ -298,7 +299,7 @@ int mbedtls_cmac_generate( mbedtls_cmac_context *ctx,
UPDATE_CMAC( M_last ); UPDATE_CMAC( M_last );
memcpy( tag, state, block_size ); memcpy( tag, state, tag_len );
exit: exit:
free(state); free(state);
@ -444,74 +445,59 @@ static const unsigned char des3_3key_key[] = {
0xbc, 0x31, 0x3d, 0x4a, 0x37, 0x1c, 0xa8, 0xb5 0xbc, 0x31, 0x3d, 0x4a, 0x37, 0x1c, 0xa8, 0xb5
}; };
static const unsigned char aes_128_subkeys[2][16] = {
{
/* Assume we don't need to test Ek0 as this is a function of the cipher */ 0xfb, 0xee, 0xd6, 0x18, 0x35, 0x71, 0x33, 0x66,
0x7c, 0x85, 0xe0, 0x8f, 0x72, 0x36, 0xa8, 0xde
/* Subkey K1 */ },
static const unsigned char aes_128_k1[] = { {
0xfb, 0xee, 0xd6, 0x18, 0x35, 0x71, 0x33, 0x66, 0xf7, 0xdd, 0xac, 0x30, 0x6a, 0xe2, 0x66, 0xcc,
0x7c, 0x85, 0xe0, 0x8f, 0x72, 0x36, 0xa8, 0xde 0xf9, 0x0b, 0xc1, 0x1e, 0xe4, 0x6d, 0x51, 0x3b
}
}; };
/* Subkey K2 */ static const unsigned char aes_192_subkeys[2][16] = {
static const unsigned char aes_128_k2[] = { {
0xf7, 0xdd, 0xac, 0x30, 0x6a, 0xe2, 0x66, 0xcc, 0x44, 0x8a, 0x5b, 0x1c, 0x93, 0x51, 0x4b, 0x27,
0xf9, 0x0b, 0xc1, 0x1e, 0xe4, 0x6d, 0x51, 0x3b 0x3e, 0xe6, 0x43, 0x9d, 0xd4, 0xda, 0xa2, 0x96
},
{
0x89, 0x14, 0xb6, 0x39, 0x26, 0xa2, 0x96, 0x4e,
0x7d, 0xcc, 0x87, 0x3b, 0xa9, 0xb5, 0x45, 0x2c
}
};
static const unsigned char aes_256_subkeys[2][16] = {
{
0xca, 0xd1, 0xed, 0x03, 0x29, 0x9e, 0xed, 0xac,
0x2e, 0x9a, 0x99, 0x80, 0x86, 0x21, 0x50, 0x2f
},
{
0x95, 0xa3, 0xda, 0x06, 0x53, 0x3d, 0xdb, 0x58,
0x5d, 0x35, 0x33, 0x01, 0x0c, 0x42, 0xa0, 0xd9
}
};
static const unsigned char des3_2key_subkeys[2][8] = {
{
0x8e, 0xcf, 0x37, 0x3e, 0xd7, 0x1a, 0xfa, 0xef
},
{
0x1d, 0x9e, 0x6e, 0x7d, 0xae, 0x35, 0xf5, 0xc5
}
};
static const unsigned char des3_3key_subkeys[2][8] = {
{
0x91, 0x98, 0xe9, 0xd3, 0x14, 0xe6, 0x53, 0x5f
},
{
0x23, 0x31, 0xd3, 0xa6, 0x29, 0xcc, 0xa6, 0xa5
}
}; };
/* All Messages are truncated from the same 64 byte buffer. */
/* Subkey K1 */
static const unsigned char aes_192_k1[] = {
0x44, 0x8a, 0x5b, 0x1c, 0x93, 0x51, 0x4b, 0x27,
0x3e, 0xe6, 0x43, 0x9d, 0xd4, 0xda, 0xa2, 0x96
};
/* Subkey K2 */
static const unsigned char aes_192_k2[] = {
0x89, 0x14, 0xb6, 0x39, 0x26, 0xa2, 0x96, 0x4e,
0x7d, 0xcc, 0x87, 0x3b, 0xa9, 0xb5, 0x45, 0x2c
};
/* Subkey K1 */
static const unsigned char aes_256_k1[] = {
0xca, 0xd1, 0xed, 0x03, 0x29, 0x9e, 0xed, 0xac,
0x2e, 0x9a, 0x99, 0x80, 0x86, 0x21, 0x50, 0x2f
};
/* Subkey K2 */
static const unsigned char aes_256_k2[] = {
0x95, 0xa3, 0xda, 0x06, 0x53, 0x3d, 0xdb, 0x58,
0x5d, 0x35, 0x33, 0x01, 0x0c, 0x42, 0xa0, 0xd9
};
/* Subkey K1 */
static const unsigned char des3_2key_k1[] = {
0x8e, 0xcf, 0x37, 0x3e, 0xd7, 0x1a, 0xfa, 0xef
};
/* Subkey K2 */
static const unsigned char des3_2key_k2[] = {
0x1d, 0x9e, 0x6e, 0x7d, 0xae, 0x35, 0xf5, 0xc5
};
/* Subkey K1 */
static const unsigned char des3_3key_k1[] = {
0x91, 0x98, 0xe9, 0xd3, 0x14, 0xe6, 0x53, 0x5f
};
/* Subkey K2 */
static const unsigned char des3_3key_k2[] = {
0x23, 0x31, 0xd3, 0xa6, 0x29, 0xcc, 0xa6, 0xa5
};
/* Assume we don't need to test Ek0 as this is a function of the cipher */
/* All Messages are the same. The difference is the length */
static const unsigned char M[] = { static const unsigned char M[] = {
0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96,
0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a,
@ -597,7 +583,7 @@ static const unsigned char T_192[NB_CMAC_TESTS_AES_192][16] = {
} }
}; };
static const unsigned char T_3des_2key[NB_CMAC_TESTS_AES_192][16] = { static const unsigned char T_3des_2key[4][8] = {
{ {
0xbd, 0x2e, 0xbf, 0x9a, 0x3b, 0xa0, 0x03, 0x61 0xbd, 0x2e, 0xbf, 0x9a, 0x3b, 0xa0, 0x03, 0x61
}, },
@ -612,7 +598,7 @@ static const unsigned char T_3des_2key[NB_CMAC_TESTS_AES_192][16] = {
} }
}; };
static const unsigned char T_3des_3key[NB_CMAC_TESTS_AES_192][16] = { static const unsigned char T_3des_3key[4][8] = {
{ {
0xb7, 0xa6, 0x88, 0xe1, 0x22, 0xff, 0xaf, 0x95 0xb7, 0xa6, 0x88, 0xe1, 0x22, 0xff, 0xaf, 0x95
}, },
@ -664,6 +650,71 @@ static const unsigned char PRFT[NB_PRF_TESTS][16] = {
} }
}; };
int test_cmac_with_cipher(int verbose,
const unsigned char* testname,
const unsigned char* key,
int keybits,
const unsigned char* messages,
size_t message_lengths[4],
const unsigned char* subkeys,
const unsigned char* expected_result,
mbedtls_cipher_id_t cipher_id,
int block_size)
{
const int num_tests = 4;
mbedtls_cmac_context ctx;
int i, ret;
unsigned char* tag;
tag = mbedtls_calloc( block_size, sizeof( unsigned char ) );
mbedtls_cmac_init( &ctx );
if( ( ret = mbedtls_cmac_setkey( &ctx, cipher_id, key, keybits ) ) != 0 )
{
if( verbose != 0 )
mbedtls_printf( " CMAC: setup failed\n" );
goto exit;
}
if( ( ret = memcmp( ctx.K1, subkeys, block_size ) != 0 ) ||
( ret = memcmp( ctx.K2, &subkeys[block_size], block_size ) != 0 ) )
{
if( verbose != 0 )
mbedtls_printf( " CMAC: subkey generation failed\n" );
goto exit;
}
for( i = 0; i < num_tests; i++ )
{
if( verbose != 0 )
mbedtls_printf( " %s CMAC #%u: ", testname, i +1 );
if( ( ret = mbedtls_cmac_generate( &ctx, messages, message_lengths[i], tag, block_size ) ) != 0 )
{
if( verbose != 0 )
mbedtls_printf( "failed\n" );
goto exit;
}
if( ( ret = memcmp( tag, &expected_result[i * block_size], block_size ) ) != 0 )
{
if( verbose != 0 )
mbedtls_printf( "failed\n" );
goto exit;
}
if( ( ret = mbedtls_cmac_verify( &ctx, messages, message_lengths[i], &expected_result[i * block_size], block_size ) != 0 ) )
{
if( verbose != 0 )
mbedtls_printf( "failed\n" );
goto exit;
}
mbedtls_printf( "passed\n" );
}
exit:
free( tag );
mbedtls_cmac_free( &ctx );
return( ret );
}
int mbedtls_cmac_self_test( int verbose ) int mbedtls_cmac_self_test( int verbose )
{ {
@ -672,189 +723,61 @@ int mbedtls_cmac_self_test( int verbose )
int i; int i;
int ret; int ret;
mbedtls_cmac_init( &ctx ); test_cmac_with_cipher(verbose,
"AES 128",
aes_128_key,
128,
M,
Mlen,
aes_128_subkeys,
T_128,
MBEDTLS_CIPHER_ID_AES,
16 );
// AES 128 bit key test_cmac_with_cipher(verbose,
if( mbedtls_cmac_setkey( &ctx, MBEDTLS_CIPHER_ID_AES, aes_128_key, 8 * sizeof(aes_128_key) ) != 0 ) "AES 192",
{ aes_192_key,
if( verbose != 0 ) 192,
mbedtls_printf( " CMAC: setup failed\n" ); M,
Mlen,
aes_192_subkeys,
T_192,
MBEDTLS_CIPHER_ID_AES,
16 );
return( 1 ); test_cmac_with_cipher(verbose,
} "AES 256",
aes_256_key,
256,
M,
Mlen,
aes_256_subkeys,
T_256,
MBEDTLS_CIPHER_ID_AES,
16 );
if( ( memcmp( ctx.K1, aes_128_k1, 16 ) != 0 ) || test_cmac_with_cipher(verbose,
( memcmp( ctx.K2, aes_128_k2, 16 ) != 0 ) ) "3DES 2 key",
{ des3_2key_key,
if( verbose != 0 ) 192,
mbedtls_printf( " CMAC: subkey generation failed\n" ); M,
Mlen_3des,
des3_2key_subkeys,
T_3des_2key,
MBEDTLS_CIPHER_ID_3DES,
8 );
return( 1 ); test_cmac_with_cipher(verbose,
} "3DES 3 key",
des3_3key_key,
192,
M,
Mlen_3des,
des3_3key_subkeys,
T_3des_3key,
MBEDTLS_CIPHER_ID_3DES,
8 );
for( i = 0; i < NB_CMAC_TESTS_AES_128; i++ )
{
mbedtls_printf( " AES-128-CMAC #%u: ", i );
ret = mbedtls_cmac_generate( &ctx, M, Mlen[i], tag, 16 );
if( ret != 0 ||
memcmp( tag, T_128[i], 16 ) != 0 )
{
if( verbose != 0 )
mbedtls_printf( "failed\n" );
return( 1 );
}
ret = mbedtls_cmac_verify( &ctx, M, Mlen[i], T_128[i], 16 );
if( ret != 0 )
{
if( verbose != 0 )
mbedtls_printf( "failed\n" );
return( 1 );
}
if( verbose != 0 )
mbedtls_printf( "passed\n" );
}
// AES 192 bit key
if( mbedtls_cmac_setkey( &ctx, MBEDTLS_CIPHER_ID_AES, aes_192_key, 8 * sizeof(aes_192_key) ) != 0 )
{
if( verbose != 0 )
mbedtls_printf( " CMAC: setup failed\n" );
return( 1 );
}
if( ( memcmp( ctx.K1, aes_192_k1, 16 ) != 0 ) ||
( memcmp( ctx.K2, aes_192_k2, 16 ) != 0 ) )
{
if( verbose != 0 )
mbedtls_printf( " CMAC: subkey generation failed\n" );
return( 1 );
}
for( i = 0; i < NB_CMAC_TESTS_AES_192; i++ )
{
mbedtls_printf( " AES-192-CMAC #%u: ", i );
ret = mbedtls_cmac_generate( &ctx, M, Mlen[i], tag, 16 );
if( ret != 0 ||
memcmp( tag, T_192[i], 16 ) != 0 )
{
if( verbose != 0 )
mbedtls_printf( "failed\n" );
return( 1 );
}
ret = mbedtls_cmac_verify( &ctx, M, Mlen[i], T_192[i], 16 );
if( ret != 0 )
{
if( verbose != 0 )
mbedtls_printf( "failed\n" );
return( 1 );
}
if( verbose != 0 )
mbedtls_printf( "passed\n" );
}
// 3DES 2 key bit key
if( (ret = mbedtls_cmac_setkey( &ctx, MBEDTLS_CIPHER_ID_3DES, des3_2key_key, 8 * sizeof(des3_2key_key) )) != 0 )
{
if( verbose != 0 )
mbedtls_printf( " CMAC: setup failed %i\n", ret);
return( 1 );
}
if( ( memcmp( ctx.K1, des3_2key_k1, 8 ) != 0 ) ||
( memcmp( ctx.K2, des3_2key_k2, 8 ) != 0 ) )
{
if( verbose != 0 )
mbedtls_printf( " CMAC: subkey generation failed\n" );
return( 1 );
}
for( i = 0; i < NB_CMAC_TESTS_3DES; i++ )
{
mbedtls_printf( " DES-112-CMAC #%u: ", i );
ret = mbedtls_cmac_generate( &ctx, M, Mlen_3des[i], tag, 8 );
if( ret != 0 ||
memcmp( tag, T_3des_2key[i], 8 ) != 0 )
{
if( verbose != 0 )
mbedtls_printf( "failed\n" );
return( 1 );
}
ret = mbedtls_cmac_verify( &ctx, M, Mlen_3des[i], T_3des_2key[i], 8 );
if( ret != 0 )
{
if( verbose != 0 )
mbedtls_printf( "failed\n" );
return( 1 );
}
if( verbose != 0 )
mbedtls_printf( "passed\n" );
}
// 3DES 3 key
if( (ret = mbedtls_cmac_setkey( &ctx, MBEDTLS_CIPHER_ID_3DES, des3_3key_key, 8 * sizeof(des3_3key_key) )) != 0 )
{
if( verbose != 0 )
mbedtls_printf( " CMAC: setup failed %i\n", ret);
return( 1 );
}
if( ( memcmp( ctx.K1, des3_3key_k1, 8 ) != 0 ) ||
( memcmp( ctx.K2, des3_3key_k2, 8 ) != 0 ) )
{
if( verbose != 0 )
mbedtls_printf( " CMAC: subkey generation failed\n" );
return( 1 );
}
for( i = 0; i < NB_CMAC_TESTS_3DES; i++ )
{
mbedtls_printf( " DES-168-CMAC #%u: ", i );
ret = mbedtls_cmac_generate( &ctx, M, Mlen_3des[i], tag, 8 );
if( ret != 0 ||
memcmp( tag, T_3des_3key[i], 8 ) != 0 )
{
if( verbose != 0 )
mbedtls_printf( "failed\n" );
return( 1 );
}
ret = mbedtls_cmac_verify( &ctx, M, Mlen_3des[i], T_3des_3key[i], 8 );
if( ret != 0 )
{
if( verbose != 0 )
mbedtls_printf( "failed\n" );
return( 1 );
}
if( verbose != 0 )
mbedtls_printf( "passed\n" );
}
mbedtls_cmac_free( &ctx );
for( i = 0; i < NB_PRF_TESTS; i++ ) for( i = 0; i < NB_PRF_TESTS; i++ )
{ {
@ -877,7 +800,7 @@ int mbedtls_cmac_self_test( int verbose )
if( verbose != 0 ) if( verbose != 0 )
mbedtls_printf( "\n" ); mbedtls_printf( "\n" );
*/
return( 0 ); return( 0 );
} }