160 lines
5.9 KiB
C
160 lines
5.9 KiB
C
/* BEGIN_HEADER */
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#include <mbedtls/constant_time.h>
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#include <mbedtls/legacy_or_psa.h>
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#include <mbedtls/md.h>
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#include <constant_time_internal.h>
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#include <hash_info.h>
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#include <test/constant_flow.h>
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/* END_HEADER */
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/* BEGIN_CASE depends_on:MBEDTLS_SSL_SOME_SUITES_USE_TLS_CBC:MBEDTLS_TEST_HOOKS */
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void ssl_cf_hmac( int hash )
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{
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/*
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* Test the function mbedtls_ct_hmac() against a reference
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* implementation.
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*/
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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mbedtls_svc_key_id_t key = MBEDTLS_SVC_KEY_ID_INIT;
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psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
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psa_algorithm_t alg;
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psa_mac_operation_t operation = PSA_MAC_OPERATION_INIT;
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#else
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mbedtls_md_context_t ctx, ref_ctx;
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const mbedtls_md_info_t *md_info;
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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size_t out_len, block_size;
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size_t min_in_len, in_len, max_in_len, i;
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/* TLS additional data is 13 bytes (hence the "lucky 13" name) */
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unsigned char add_data[13];
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unsigned char ref_out[MBEDTLS_HASH_MAX_SIZE];
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unsigned char *data = NULL;
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unsigned char *out = NULL;
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unsigned char rec_num = 0;
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USE_PSA_INIT( );
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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alg = PSA_ALG_HMAC( mbedtls_hash_info_psa_from_md( hash ) );
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out_len = PSA_HASH_LENGTH( alg );
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block_size = PSA_HASH_BLOCK_LENGTH( alg );
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/* mbedtls_ct_hmac() requires the key to be exportable */
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psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_EXPORT |
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PSA_KEY_USAGE_VERIFY_HASH );
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psa_set_key_algorithm( &attributes, PSA_ALG_HMAC( alg ) );
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psa_set_key_type( &attributes, PSA_KEY_TYPE_HMAC );
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#else
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mbedtls_md_init( &ctx );
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mbedtls_md_init( &ref_ctx );
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md_info = mbedtls_md_info_from_type( hash );
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TEST_ASSERT( md_info != NULL );
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out_len = mbedtls_md_get_size( md_info );
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TEST_ASSERT( out_len != 0 );
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block_size = hash == MBEDTLS_MD_SHA384 ? 128 : 64;
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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/* Use allocated out buffer to catch overwrites */
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ASSERT_ALLOC( out, out_len );
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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/* Set up dummy key */
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memset( ref_out, 42, sizeof( ref_out ) );
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TEST_EQUAL( PSA_SUCCESS, psa_import_key( &attributes,
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ref_out, out_len,
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&key ) );
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#else
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/* Set up contexts with the given hash and a dummy key */
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TEST_EQUAL( 0, mbedtls_md_setup( &ctx, md_info, 1 ) );
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TEST_EQUAL( 0, mbedtls_md_setup( &ref_ctx, md_info, 1 ) );
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memset( ref_out, 42, sizeof( ref_out ) );
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TEST_EQUAL( 0, mbedtls_md_hmac_starts( &ctx, ref_out, out_len ) );
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TEST_EQUAL( 0, mbedtls_md_hmac_starts( &ref_ctx, ref_out, out_len ) );
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memset( ref_out, 0, sizeof( ref_out ) );
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#endif
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/*
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* Test all possible lengths up to a point. The difference between
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* max_in_len and min_in_len is at most 255, and make sure they both vary
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* by at least one block size.
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*/
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for( max_in_len = 0; max_in_len <= 255 + block_size; max_in_len++ )
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{
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mbedtls_test_set_step( max_in_len * 10000 );
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/* Use allocated in buffer to catch overreads */
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ASSERT_ALLOC( data, max_in_len );
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min_in_len = max_in_len > 255 ? max_in_len - 255 : 0;
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for( in_len = min_in_len; in_len <= max_in_len; in_len++ )
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{
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mbedtls_test_set_step( max_in_len * 10000 + in_len );
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/* Set up dummy data and add_data */
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rec_num++;
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memset( add_data, rec_num, sizeof( add_data ) );
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for( i = 0; i < in_len; i++ )
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data[i] = ( i & 0xff ) ^ rec_num;
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/* Get the function's result */
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TEST_CF_SECRET( &in_len, sizeof( in_len ) );
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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TEST_EQUAL( 0, mbedtls_ct_hmac( key, PSA_ALG_HMAC( alg ),
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add_data, sizeof( add_data ),
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data, in_len,
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min_in_len, max_in_len,
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out ) );
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#else
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TEST_EQUAL( 0, mbedtls_ct_hmac( &ctx, add_data, sizeof( add_data ),
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data, in_len,
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min_in_len, max_in_len,
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out ) );
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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TEST_CF_PUBLIC( &in_len, sizeof( in_len ) );
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TEST_CF_PUBLIC( out, out_len );
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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TEST_EQUAL( PSA_SUCCESS, psa_mac_verify_setup( &operation,
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key, alg ) );
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TEST_EQUAL( PSA_SUCCESS, psa_mac_update( &operation, add_data,
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sizeof( add_data ) ) );
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TEST_EQUAL( PSA_SUCCESS, psa_mac_update( &operation,
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data, in_len ) );
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TEST_EQUAL( PSA_SUCCESS, psa_mac_verify_finish( &operation,
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out, out_len ) );
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#else
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/* Compute the reference result */
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TEST_EQUAL( 0, mbedtls_md_hmac_update( &ref_ctx, add_data,
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sizeof( add_data ) ) );
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TEST_EQUAL( 0, mbedtls_md_hmac_update( &ref_ctx, data, in_len ) );
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TEST_EQUAL( 0, mbedtls_md_hmac_finish( &ref_ctx, ref_out ) );
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TEST_EQUAL( 0, mbedtls_md_hmac_reset( &ref_ctx ) );
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/* Compare */
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ASSERT_COMPARE( out, out_len, ref_out, out_len );
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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}
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mbedtls_free( data );
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data = NULL;
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}
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exit:
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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psa_mac_abort( &operation );
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psa_destroy_key( key );
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#else
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mbedtls_md_free( &ref_ctx );
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mbedtls_md_free( &ctx );
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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mbedtls_free( data );
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mbedtls_free( out );
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USE_PSA_DONE( );
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}
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/* END_CASE */
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