| /* BEGIN_HEADER */ |
| #include "mbedtls/hmac_drbg.h" |
| #include "string.h" |
| |
| typedef struct |
| { |
| unsigned char *p; |
| size_t len; |
| } entropy_ctx; |
| |
| static int mbedtls_test_entropy_func( void *data, unsigned char *buf, size_t len ) |
| { |
| entropy_ctx *ctx = (entropy_ctx *) data; |
| |
| if( len > ctx->len ) |
| return( -1 ); |
| |
| memcpy( buf, ctx->p, len ); |
| |
| ctx->p += len; |
| ctx->len -= len; |
| |
| return( 0 ); |
| } |
| /* END_HEADER */ |
| |
| /* BEGIN_DEPENDENCIES |
| * depends_on:MBEDTLS_HMAC_DRBG_C |
| * END_DEPENDENCIES |
| */ |
| |
| /* BEGIN_CASE */ |
| void hmac_drbg_entropy_usage( int md_alg ) |
| { |
| unsigned char out[16]; |
| unsigned char buf[1024]; |
| const mbedtls_md_info_t *md_info; |
| mbedtls_hmac_drbg_context ctx; |
| entropy_ctx entropy; |
| size_t i, reps = 10; |
| size_t default_entropy_len; |
| size_t expected_consumed_entropy = 0; |
| |
| mbedtls_hmac_drbg_init( &ctx ); |
| memset( buf, 0, sizeof( buf ) ); |
| memset( out, 0, sizeof( out ) ); |
| |
| entropy.len = sizeof( buf ); |
| entropy.p = buf; |
| |
| md_info = mbedtls_md_info_from_type( md_alg ); |
| TEST_ASSERT( md_info != NULL ); |
| if( mbedtls_md_get_size( md_info ) <= 20 ) |
| default_entropy_len = 16; |
| else if( mbedtls_md_get_size( md_info ) <= 28 ) |
| default_entropy_len = 24; |
| else |
| default_entropy_len = 32; |
| |
| /* Init must use entropy */ |
| TEST_ASSERT( mbedtls_hmac_drbg_seed( &ctx, md_info, mbedtls_test_entropy_func, &entropy, |
| NULL, 0 ) == 0 ); |
| /* default_entropy_len of entropy, plus half as much for the nonce */ |
| expected_consumed_entropy += default_entropy_len * 3 / 2; |
| TEST_EQUAL( sizeof( buf ) - entropy.len, expected_consumed_entropy ); |
| |
| /* By default, PR is off and reseed_interval is large, |
| * so the next few calls should not use entropy */ |
| for( i = 0; i < reps; i++ ) |
| { |
| TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) - 4 ) == 0 ); |
| TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, out, sizeof( out ) - 4, |
| buf, 16 ) == 0 ); |
| } |
| TEST_EQUAL( sizeof( buf ) - entropy.len, expected_consumed_entropy ); |
| |
| /* While at it, make sure we didn't write past the requested length */ |
| TEST_ASSERT( out[sizeof( out ) - 4] == 0 ); |
| TEST_ASSERT( out[sizeof( out ) - 3] == 0 ); |
| TEST_ASSERT( out[sizeof( out ) - 2] == 0 ); |
| TEST_ASSERT( out[sizeof( out ) - 1] == 0 ); |
| |
| /* Set reseed_interval to the number of calls done, |
| * so the next call should reseed */ |
| mbedtls_hmac_drbg_set_reseed_interval( &ctx, 2 * reps ); |
| TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 ); |
| expected_consumed_entropy += default_entropy_len; |
| TEST_EQUAL( sizeof( buf ) - entropy.len, expected_consumed_entropy ); |
| |
| /* The new few calls should not reseed */ |
| for( i = 0; i < reps / 2; i++ ) |
| { |
| TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 ); |
| TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, out, sizeof( out ) , |
| buf, 16 ) == 0 ); |
| } |
| TEST_EQUAL( sizeof( buf ) - entropy.len, expected_consumed_entropy ); |
| |
| /* Now enable PR, so the next few calls should all reseed */ |
| mbedtls_hmac_drbg_set_prediction_resistance( &ctx, MBEDTLS_HMAC_DRBG_PR_ON ); |
| TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 ); |
| expected_consumed_entropy += default_entropy_len; |
| TEST_EQUAL( sizeof( buf ) - entropy.len, expected_consumed_entropy ); |
| |
| /* Finally, check setting entropy_len */ |
| mbedtls_hmac_drbg_set_entropy_len( &ctx, 42 ); |
| TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 ); |
| expected_consumed_entropy += 42; |
| TEST_EQUAL( sizeof( buf ) - entropy.len, expected_consumed_entropy ); |
| |
| mbedtls_hmac_drbg_set_entropy_len( &ctx, 13 ); |
| TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 ); |
| expected_consumed_entropy += 13; |
| TEST_EQUAL( sizeof( buf ) - entropy.len, expected_consumed_entropy ); |
| |
| exit: |
| mbedtls_hmac_drbg_free( &ctx ); |
| } |
| /* END_CASE */ |
| |
| /* BEGIN_CASE depends_on:MBEDTLS_FS_IO */ |
| void hmac_drbg_seed_file( int md_alg, char * path, int ret ) |
| { |
| const mbedtls_md_info_t *md_info; |
| mbedtls_hmac_drbg_context ctx; |
| |
| mbedtls_hmac_drbg_init( &ctx ); |
| |
| md_info = mbedtls_md_info_from_type( md_alg ); |
| TEST_ASSERT( md_info != NULL ); |
| |
| TEST_ASSERT( mbedtls_hmac_drbg_seed( &ctx, md_info, rnd_std_rand, NULL, |
| NULL, 0 ) == 0 ); |
| |
| TEST_ASSERT( mbedtls_hmac_drbg_write_seed_file( &ctx, path ) == ret ); |
| TEST_ASSERT( mbedtls_hmac_drbg_update_seed_file( &ctx, path ) == ret ); |
| |
| exit: |
| mbedtls_hmac_drbg_free( &ctx ); |
| } |
| /* END_CASE */ |
| |
| /* BEGIN_CASE */ |
| void hmac_drbg_buf( int md_alg ) |
| { |
| unsigned char out[16]; |
| unsigned char buf[100]; |
| const mbedtls_md_info_t *md_info; |
| mbedtls_hmac_drbg_context ctx; |
| size_t i; |
| |
| mbedtls_hmac_drbg_init( &ctx ); |
| memset( buf, 0, sizeof( buf ) ); |
| memset( out, 0, sizeof( out ) ); |
| |
| md_info = mbedtls_md_info_from_type( md_alg ); |
| TEST_ASSERT( md_info != NULL ); |
| TEST_ASSERT( mbedtls_hmac_drbg_seed_buf( &ctx, md_info, buf, sizeof( buf ) ) == 0 ); |
| |
| /* Make sure it never tries to reseed (would segfault otherwise) */ |
| mbedtls_hmac_drbg_set_reseed_interval( &ctx, 3 ); |
| mbedtls_hmac_drbg_set_prediction_resistance( &ctx, MBEDTLS_HMAC_DRBG_PR_ON ); |
| |
| for( i = 0; i < 30; i++ ) |
| TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 ); |
| |
| exit: |
| mbedtls_hmac_drbg_free( &ctx ); |
| } |
| /* END_CASE */ |
| |
| /* BEGIN_CASE */ |
| void hmac_drbg_no_reseed( int md_alg, data_t * entropy, |
| data_t * custom, data_t * add1, |
| data_t * add2, data_t * output ) |
| { |
| unsigned char data[1024]; |
| unsigned char my_output[512]; |
| entropy_ctx p_entropy; |
| const mbedtls_md_info_t *md_info; |
| mbedtls_hmac_drbg_context ctx; |
| |
| mbedtls_hmac_drbg_init( &ctx ); |
| |
| p_entropy.p = entropy->x; |
| p_entropy.len = entropy->len; |
| |
| md_info = mbedtls_md_info_from_type( md_alg ); |
| TEST_ASSERT( md_info != NULL ); |
| |
| /* Test the simplified buffer-based variant */ |
| memcpy( data, entropy->x, p_entropy.len ); |
| memcpy( data + p_entropy.len, custom->x, custom->len ); |
| TEST_ASSERT( mbedtls_hmac_drbg_seed_buf( &ctx, md_info, |
| data, p_entropy.len + custom->len ) == 0 ); |
| TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len, |
| add1->x, add1->len ) == 0 ); |
| TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len, |
| add2->x, add2->len ) == 0 ); |
| |
| /* clear for second run */ |
| mbedtls_hmac_drbg_free( &ctx ); |
| |
| TEST_ASSERT( memcmp( my_output, output->x, output->len ) == 0 ); |
| |
| /* And now the normal entropy-based variant */ |
| TEST_ASSERT( mbedtls_hmac_drbg_seed( &ctx, md_info, mbedtls_test_entropy_func, &p_entropy, |
| custom->x, custom->len ) == 0 ); |
| TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len, |
| add1->x, add1->len ) == 0 ); |
| TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len, |
| add2->x, add2->len ) == 0 ); |
| TEST_ASSERT( memcmp( my_output, output->x, output->len ) == 0 ); |
| |
| exit: |
| mbedtls_hmac_drbg_free( &ctx ); |
| } |
| /* END_CASE */ |
| |
| /* BEGIN_CASE */ |
| void hmac_drbg_nopr( int md_alg, data_t * entropy, data_t * custom, |
| data_t * add1, data_t * add2, data_t * add3, |
| data_t * output ) |
| { |
| unsigned char my_output[512]; |
| entropy_ctx p_entropy; |
| const mbedtls_md_info_t *md_info; |
| mbedtls_hmac_drbg_context ctx; |
| |
| mbedtls_hmac_drbg_init( &ctx ); |
| |
| p_entropy.p = entropy->x; |
| p_entropy.len = entropy->len; |
| |
| md_info = mbedtls_md_info_from_type( md_alg ); |
| TEST_ASSERT( md_info != NULL ); |
| |
| TEST_ASSERT( mbedtls_hmac_drbg_seed( &ctx, md_info, mbedtls_test_entropy_func, &p_entropy, |
| custom->x, custom->len ) == 0 ); |
| TEST_ASSERT( mbedtls_hmac_drbg_reseed( &ctx, add1->x, add1->len ) == 0 ); |
| TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len, |
| add2->x, add2->len ) == 0 ); |
| TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len, |
| add3->x, add3->len ) == 0 ); |
| |
| TEST_ASSERT( memcmp( my_output, output->x, output->len ) == 0 ); |
| |
| exit: |
| mbedtls_hmac_drbg_free( &ctx ); |
| } |
| /* END_CASE */ |
| |
| /* BEGIN_CASE */ |
| void hmac_drbg_pr( int md_alg, data_t * entropy, data_t * custom, |
| data_t * add1, data_t * add2, data_t * output ) |
| { |
| unsigned char my_output[512]; |
| entropy_ctx p_entropy; |
| const mbedtls_md_info_t *md_info; |
| mbedtls_hmac_drbg_context ctx; |
| |
| mbedtls_hmac_drbg_init( &ctx ); |
| |
| p_entropy.p = entropy->x; |
| p_entropy.len = entropy->len; |
| |
| md_info = mbedtls_md_info_from_type( md_alg ); |
| TEST_ASSERT( md_info != NULL ); |
| |
| TEST_ASSERT( mbedtls_hmac_drbg_seed( &ctx, md_info, mbedtls_test_entropy_func, &p_entropy, |
| custom->x, custom->len ) == 0 ); |
| mbedtls_hmac_drbg_set_prediction_resistance( &ctx, MBEDTLS_HMAC_DRBG_PR_ON ); |
| TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len, |
| add1->x, add1->len ) == 0 ); |
| TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len, |
| add2->x, add2->len ) == 0 ); |
| |
| TEST_ASSERT( memcmp( my_output, output->x, output->len ) == 0 ); |
| |
| exit: |
| mbedtls_hmac_drbg_free( &ctx ); |
| } |
| /* END_CASE */ |
| |
| /* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */ |
| void hmac_drbg_selftest( ) |
| { |
| TEST_ASSERT( mbedtls_hmac_drbg_self_test( 1 ) == 0 ); |
| } |
| /* END_CASE */ |