180 lines
6 KiB
Text
180 lines
6 KiB
Text
/* BEGIN_HEADER */
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#include <polarssl/ctr_drbg.h>
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int test_offset_idx;
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int entropy_func( void *data, unsigned char *buf, size_t len )
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{
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const unsigned char *p = (unsigned char *) data;
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memcpy( buf, p + test_offset_idx, len );
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test_offset_idx += len;
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return( 0 );
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}
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/* END_HEADER */
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/* BEGIN_DEPENDENCIES
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* depends_on:POLARSSL_CTR_DRBG_C
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* END_DEPENDENCIES
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*/
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/* BEGIN_CASE */
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void ctr_drbg_validate_pr( char *add_init_string, char *entropy_string,
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char *add1_string, char *add2_string,
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char *result_str )
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{
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unsigned char entropy[512];
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unsigned char add_init[512];
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unsigned char add1[512];
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unsigned char add2[512];
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ctr_drbg_context ctx;
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unsigned char buf[512];
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unsigned char output_str[512];
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int add_init_len, add1_len, add2_len;
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memset( output_str, 0, 512 );
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unhexify( entropy, entropy_string );
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add_init_len = unhexify( add_init, add_init_string );
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add1_len = unhexify( add1, add1_string );
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add2_len = unhexify( add2, add2_string );
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test_offset_idx = 0;
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TEST_ASSERT( ctr_drbg_init_entropy_len( &ctx, entropy_func, entropy, add_init, add_init_len, 32 ) == 0 );
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ctr_drbg_set_prediction_resistance( &ctx, CTR_DRBG_PR_ON );
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TEST_ASSERT( ctr_drbg_random_with_add( &ctx, buf, 16, add1, add1_len ) == 0 );
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TEST_ASSERT( ctr_drbg_random_with_add( &ctx, buf, 16, add2, add2_len ) == 0 );
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hexify( output_str, buf, 16 );
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TEST_ASSERT( strcmp( (char *) output_str, result_str ) == 0 );
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ctr_drbg_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void ctr_drbg_validate_nopr( char *add_init_string, char *entropy_string,
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char *add1_string, char *add_reseed_string,
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char *add2_string, char *result_str )
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{
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unsigned char entropy[512];
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unsigned char add_init[512];
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unsigned char add1[512];
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unsigned char add_reseed[512];
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unsigned char add2[512];
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ctr_drbg_context ctx;
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unsigned char buf[512];
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unsigned char output_str[512];
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int add_init_len, add1_len, add_reseed_len, add2_len;
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memset( output_str, 0, 512 );
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unhexify( entropy, entropy_string );
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add_init_len = unhexify( add_init, add_init_string );
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add1_len = unhexify( add1, add1_string );
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add_reseed_len = unhexify( add_reseed, add_reseed_string );
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add2_len = unhexify( add2, add2_string );
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test_offset_idx = 0;
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TEST_ASSERT( ctr_drbg_init_entropy_len( &ctx, entropy_func, entropy, add_init, add_init_len, 32 ) == 0 );
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TEST_ASSERT( ctr_drbg_random_with_add( &ctx, buf, 16, add1, add1_len ) == 0 );
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TEST_ASSERT( ctr_drbg_reseed( &ctx, add_reseed, add_reseed_len ) == 0 );
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TEST_ASSERT( ctr_drbg_random_with_add( &ctx, buf, 16, add2, add2_len ) == 0 );
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hexify( output_str, buf, 16 );
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TEST_ASSERT( strcmp( (char *) output_str, result_str ) == 0 );
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ctr_drbg_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void ctr_drbg_entropy_usage( )
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{
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unsigned char out[16];
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unsigned char add[16];
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unsigned char entropy[1024];
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ctr_drbg_context ctx;
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size_t i, reps = 10;
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int last_idx;
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test_offset_idx = 0;
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memset( entropy, 0, sizeof( entropy ) );
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memset( out, 0, sizeof( out ) );
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memset( add, 0, sizeof( add ) );
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/* Init must use entropy */
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last_idx = test_offset_idx;
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TEST_ASSERT( ctr_drbg_init( &ctx, entropy_func, entropy, NULL, 0 ) == 0 );
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TEST_ASSERT( last_idx < test_offset_idx );
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/* By default, PR is off and reseed_interval is large,
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* so the next few calls should not use entropy */
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last_idx = test_offset_idx;
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for( i = 0; i < reps; i++ )
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{
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TEST_ASSERT( ctr_drbg_random( &ctx, out, sizeof( out ) - 4 ) == 0 );
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TEST_ASSERT( ctr_drbg_random_with_add( &ctx, out, sizeof( out ) - 4,
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add, sizeof( add ) ) == 0 );
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}
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TEST_ASSERT( last_idx == test_offset_idx );
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/* While at it, make sure we didn't write past the requested length */
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TEST_ASSERT( out[sizeof( out ) - 4] == 0 );
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TEST_ASSERT( out[sizeof( out ) - 3] == 0 );
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TEST_ASSERT( out[sizeof( out ) - 2] == 0 );
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TEST_ASSERT( out[sizeof( out ) - 1] == 0 );
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/* Set reseed_interval to the number of calls done,
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* so the next call should reseed */
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ctr_drbg_set_reseed_interval( &ctx, 2 * reps );
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TEST_ASSERT( ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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TEST_ASSERT( last_idx < test_offset_idx );
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/* The new few calls should not reseed */
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last_idx = test_offset_idx;
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for( i = 0; i < reps / 2; i++ )
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{
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TEST_ASSERT( ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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TEST_ASSERT( ctr_drbg_random_with_add( &ctx, out, sizeof( out ) ,
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add, sizeof( add ) ) == 0 );
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}
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TEST_ASSERT( last_idx == test_offset_idx );
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/* Now enable PR, so the next few calls should all reseed */
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ctr_drbg_set_prediction_resistance( &ctx, CTR_DRBG_PR_ON );
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TEST_ASSERT( ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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TEST_ASSERT( last_idx < test_offset_idx );
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/* Finally, check setting entropy_len */
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ctr_drbg_set_entropy_len( &ctx, 42 );
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last_idx = test_offset_idx;
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TEST_ASSERT( ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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TEST_ASSERT( test_offset_idx - last_idx == 42 );
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ctr_drbg_set_entropy_len( &ctx, 13 );
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last_idx = test_offset_idx;
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TEST_ASSERT( ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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TEST_ASSERT( test_offset_idx - last_idx == 13 );
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ctr_drbg_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:POLARSSL_FS_IO */
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void ctr_drbg_seed_file( char *path, int ret )
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{
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ctr_drbg_context ctx;
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TEST_ASSERT( ctr_drbg_init( &ctx, rnd_std_rand, NULL, NULL, 0 ) == 0 );
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TEST_ASSERT( ctr_drbg_write_seed_file( &ctx, path ) == ret );
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TEST_ASSERT( ctr_drbg_update_seed_file( &ctx, path ) == ret );
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ctr_drbg_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:POLARSSL_SELF_TEST */
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void ctr_drbg_selftest( )
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{
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TEST_ASSERT( ctr_drbg_self_test( 0 ) == 0 );
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}
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/* END_CASE */
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