| /* BEGIN_HEADER */ |
| #include "mbedtls/entropy.h" |
| #include "mbedtls/ctr_drbg.h" |
| #include "string.h" |
| |
| /* Modes for ctr_drbg_validate */ |
| enum reseed_mode |
| { |
| RESEED_NEVER, /* never reseed */ |
| RESEED_FIRST, /* instantiate, reseed, generate, generate */ |
| RESEED_SECOND, /* instantiate, generate, reseed, generate */ |
| RESEED_ALWAYS /* prediction resistance, no explicit reseed */ |
| }; |
| |
| static size_t test_offset_idx; |
| static size_t test_max_idx; |
| static int mbedtls_test_entropy_func( void *data, unsigned char *buf, size_t len ) |
| { |
| const unsigned char *p = (unsigned char *) data; |
| if( test_offset_idx + len > test_max_idx ) |
| return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED ); |
| memcpy( buf, p + test_offset_idx, len ); |
| test_offset_idx += len; |
| return( 0 ); |
| } |
| /* END_HEADER */ |
| |
| /* BEGIN_DEPENDENCIES |
| * depends_on:MBEDTLS_CTR_DRBG_C |
| * END_DEPENDENCIES |
| */ |
| |
| /* BEGIN_CASE */ |
| void ctr_drbg_special_behaviours( ) |
| { |
| mbedtls_ctr_drbg_context ctx; |
| unsigned char output[512]; |
| unsigned char additional[512]; |
| |
| mbedtls_ctr_drbg_init( &ctx ); |
| memset( output, 0, sizeof( output ) ); |
| memset( additional, 0, sizeof( additional ) ); |
| |
| TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, |
| output, MBEDTLS_CTR_DRBG_MAX_REQUEST + 1, |
| additional, 16 ) == |
| MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG ); |
| TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, |
| output, 16, |
| additional, MBEDTLS_CTR_DRBG_MAX_INPUT + 1 ) == |
| MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG ); |
| |
| TEST_ASSERT( mbedtls_ctr_drbg_reseed( &ctx, additional, |
| MBEDTLS_CTR_DRBG_MAX_SEED_INPUT + 1 ) == |
| MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG ); |
| |
| mbedtls_ctr_drbg_set_entropy_len( &ctx, ~0 ); |
| TEST_ASSERT( mbedtls_ctr_drbg_reseed( &ctx, additional, |
| MBEDTLS_CTR_DRBG_MAX_SEED_INPUT ) == |
| MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG ); |
| exit: |
| mbedtls_ctr_drbg_free( &ctx ); |
| } |
| /* END_CASE */ |
| |
| /* BEGIN_CASE */ |
| void ctr_drbg_validate( int reseed_mode, char *nonce_string, |
| int entropy_len_arg, char *entropy_string, |
| char *reseed_string, |
| char *add1_string, char *add2_string, |
| char *result_string ) |
| { |
| unsigned char entropy[144]; |
| unsigned char nonce[64]; |
| unsigned char reseed[32]; |
| unsigned char add1[48]; |
| unsigned char add2[48]; |
| mbedtls_ctr_drbg_context ctx; |
| unsigned char buf[64]; |
| unsigned char result[64]; |
| size_t entropy_chunk_len = (size_t) entropy_len_arg; |
| size_t nonce_len, reseed_len, add1_len, add2_len, result_len; |
| |
| test_offset_idx = 0; |
| mbedtls_ctr_drbg_init( &ctx ); |
| |
| test_max_idx = unhexify( entropy, entropy_string ); |
| nonce_len = unhexify( nonce, nonce_string ); |
| reseed_len = unhexify( reseed, reseed_string ); |
| add1_len = unhexify( add1, add1_string ); |
| add2_len = unhexify( add2, add2_string ); |
| result_len = unhexify( result, result_string ); |
| |
| /* CTR_DRBG_Instantiate(entropy[:entropy_len], nonce, perso, <ignored>) |
| * where nonce||perso = nonce[nonce_len] */ |
| TEST_ASSERT( mbedtls_ctr_drbg_seed_entropy_len( |
| &ctx, |
| mbedtls_test_entropy_func, entropy, |
| nonce, nonce_len, |
| entropy_chunk_len ) == 0 ); |
| if( reseed_mode == RESEED_ALWAYS ) |
| mbedtls_ctr_drbg_set_prediction_resistance( |
| &ctx, |
| MBEDTLS_CTR_DRBG_PR_ON ); |
| |
| if( reseed_mode == RESEED_FIRST ) |
| { |
| /* CTR_DRBG_Reseed(entropy[idx:idx+entropy_len], |
| * reseed[:reseed_len]) */ |
| TEST_ASSERT( mbedtls_ctr_drbg_reseed( |
| &ctx, |
| reseed, reseed_len ) == 0 ); |
| } |
| |
| /* CTR_DRBG_Generate(result_len * 8 bits, add1[:add1_len]) -> buf */ |
| /* Then reseed if prediction resistance is enabled. */ |
| TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( |
| &ctx, |
| buf, result_len, |
| add1, add1_len ) == 0 ); |
| |
| |
| if( reseed_mode == RESEED_SECOND ) |
| { |
| /* CTR_DRBG_Reseed(entropy[idx:idx+entropy_len], |
| * reseed[:reseed_len]) */ |
| TEST_ASSERT( mbedtls_ctr_drbg_reseed( |
| &ctx, |
| reseed, reseed_len ) == 0 ); |
| } |
| |
| /* CTR_DRBG_Generate(result_len * 8 bits, add2[:add2_len]) -> buf */ |
| /* Then reseed if prediction resistance is enabled. */ |
| TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( |
| &ctx, |
| buf, result_len, |
| add2, add2_len ) == 0 ); |
| TEST_ASSERT( memcmp( buf, result, result_len ) == 0 ); |
| |
| exit: |
| mbedtls_ctr_drbg_free( &ctx ); |
| } |
| /* END_CASE */ |
| |
| /* BEGIN_CASE */ |
| void ctr_drbg_validate_no_reseed( char *add_init_string, char *entropy_string, |
| char *add1_string, char *add2_string, |
| char *result_string ) |
| { |
| test_suite_ctr_drbg_validate( RESEED_NEVER, add_init_string, |
| strlen( entropy_string ) / 2, entropy_string, |
| "", add1_string, add2_string, |
| result_string ); |
| goto exit; |
| } |
| /* END_CASE */ |
| |
| /* BEGIN_CASE */ |
| void ctr_drbg_validate_pr( char *add_init_string, char *entropy_string, |
| char *add1_string, char *add2_string, |
| char *result_string ) |
| { |
| test_suite_ctr_drbg_validate( RESEED_ALWAYS, add_init_string, |
| strlen( entropy_string ) / 6, entropy_string, |
| "", add1_string, add2_string, |
| result_string ); |
| goto exit; |
| } |
| /* END_CASE */ |
| |
| /* BEGIN_CASE */ |
| void ctr_drbg_validate_nopr( data_t * add_init, data_t * entropy, |
| data_t * add1, data_t * add_reseed, |
| char *add2_string, char *result_string ) |
| { |
| test_suite_ctr_drbg_validate( RESEED_SECOND, add_init_string, |
| strlen( entropy_string ) / 4, entropy_string, |
| add_reseed_string, add1_string, add2_string, |
| result_string ); |
| goto exit; |
| } |
| /* END_CASE */ |
| |
| /* BEGIN_CASE */ |
| void ctr_drbg_entropy_usage( ) |
| { |
| unsigned char out[16]; |
| unsigned char add[16]; |
| unsigned char entropy[1024]; |
| mbedtls_ctr_drbg_context ctx; |
| size_t i, reps = 10; |
| size_t last_idx; |
| |
| mbedtls_ctr_drbg_init( &ctx ); |
| test_offset_idx = 0; |
| test_max_idx = sizeof( entropy ); |
| memset( entropy, 0, sizeof( entropy ) ); |
| memset( out, 0, sizeof( out ) ); |
| memset( add, 0, sizeof( add ) ); |
| |
| /* Init must use entropy */ |
| last_idx = test_offset_idx; |
| TEST_ASSERT( mbedtls_ctr_drbg_seed( &ctx, mbedtls_test_entropy_func, entropy, NULL, 0 ) == 0 ); |
| TEST_ASSERT( last_idx < test_offset_idx ); |
| |
| /* By default, PR is off and reseed_interval is large, |
| * so the next few calls should not use entropy */ |
| last_idx = test_offset_idx; |
| for( i = 0; i < reps; i++ ) |
| { |
| TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) - 4 ) == 0 ); |
| TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, out, sizeof( out ) - 4, |
| add, sizeof( add ) ) == 0 ); |
| } |
| TEST_ASSERT( last_idx == test_offset_idx ); |
| |
| /* 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_ctr_drbg_set_reseed_interval( &ctx, 2 * reps ); |
| TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 ); |
| TEST_ASSERT( last_idx < test_offset_idx ); |
| |
| /* The new few calls should not reseed */ |
| last_idx = test_offset_idx; |
| for( i = 0; i < reps / 2; i++ ) |
| { |
| TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 ); |
| TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, out, sizeof( out ) , |
| add, sizeof( add ) ) == 0 ); |
| } |
| TEST_ASSERT( last_idx == test_offset_idx ); |
| |
| /* Call update with too much data (sizeof entropy > MAX(_SEED)_INPUT) |
| * (just make sure it doesn't cause memory corruption) */ |
| mbedtls_ctr_drbg_update( &ctx, entropy, sizeof( entropy ) ); |
| |
| /* Now enable PR, so the next few calls should all reseed */ |
| mbedtls_ctr_drbg_set_prediction_resistance( &ctx, MBEDTLS_CTR_DRBG_PR_ON ); |
| TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 ); |
| TEST_ASSERT( last_idx < test_offset_idx ); |
| |
| /* Finally, check setting entropy_len */ |
| mbedtls_ctr_drbg_set_entropy_len( &ctx, 42 ); |
| last_idx = test_offset_idx; |
| TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 ); |
| TEST_ASSERT( test_offset_idx - last_idx == 42 ); |
| |
| mbedtls_ctr_drbg_set_entropy_len( &ctx, 13 ); |
| last_idx = test_offset_idx; |
| TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 ); |
| TEST_ASSERT( test_offset_idx - last_idx == 13 ); |
| |
| exit: |
| mbedtls_ctr_drbg_free( &ctx ); |
| } |
| /* END_CASE */ |
| |
| /* BEGIN_CASE depends_on:MBEDTLS_FS_IO */ |
| void ctr_drbg_seed_file( char * path, int ret ) |
| { |
| mbedtls_ctr_drbg_context ctx; |
| |
| mbedtls_ctr_drbg_init( &ctx ); |
| |
| TEST_ASSERT( mbedtls_ctr_drbg_seed( &ctx, rnd_std_rand, NULL, NULL, 0 ) == 0 ); |
| TEST_ASSERT( mbedtls_ctr_drbg_write_seed_file( &ctx, path ) == ret ); |
| TEST_ASSERT( mbedtls_ctr_drbg_update_seed_file( &ctx, path ) == ret ); |
| |
| exit: |
| mbedtls_ctr_drbg_free( &ctx ); |
| } |
| /* END_CASE */ |
| |
| /* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */ |
| void ctr_drbg_selftest( ) |
| { |
| TEST_ASSERT( mbedtls_ctr_drbg_self_test( 1 ) == 0 ); |
| } |
| /* END_CASE */ |