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Expand CTR_DRBG test coverage

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This commit is contained in:
Manuel Pégourié-Gonnard
2014-01-31 12:16:54 +01:00
parent b3b205e081
commit 7575daa1f2
3 changed files with 94 additions and 2 deletions
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86
tests/suites/test_suite_ctr_drbg.function
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@@ -4,9 +4,9 @@
int test_offset_idx;
int entropy_func( void *data, unsigned char *buf, size_t len )
{
unsigned char *p = (unsigned char *) data;
const unsigned char *p = (unsigned char *) data;
memcpy( buf, p + test_offset_idx, len );
test_offset_idx += 32;
test_offset_idx += len;
return( 0 );
}
/* END_HEADER */
@@ -82,6 +82,88 @@ void ctr_drbg_validate_nopr( char *add_init_string, char *entropy_string,
}
/* END_CASE */
/* BEGIN_CASE */
void ctr_drbg_entropy_usage( )
{
unsigned char out[16];
unsigned char add[16];
unsigned char entropy[1024];
ctr_drbg_context ctx;
size_t i, reps = 10;
int last_idx;
test_offset_idx = 0;
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( ctr_drbg_init( &ctx, 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( ctr_drbg_random( &ctx, out, sizeof( out ) - 4 ) == 0 );
TEST_ASSERT( 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 */
ctr_drbg_set_reseed_interval( &ctx, 2 * reps );
TEST_ASSERT( 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( ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
TEST_ASSERT( ctr_drbg_random_with_add( &ctx, out, sizeof( out ) ,
add, sizeof( add ) ) == 0 );
}
TEST_ASSERT( last_idx == test_offset_idx );
/* Now enable PR, so the next few calls should all reseed */
ctr_drbg_set_prediction_resistance( &ctx, CTR_DRBG_PR_ON );
TEST_ASSERT( ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
TEST_ASSERT( last_idx < test_offset_idx );
/* Finally, check setting entropy_len */
ctr_drbg_set_entropy_len( &ctx, 42 );
last_idx = test_offset_idx;
TEST_ASSERT( ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
TEST_ASSERT( test_offset_idx - last_idx == 42 );
ctr_drbg_set_entropy_len( &ctx, 13 );
last_idx = test_offset_idx;
TEST_ASSERT( ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
TEST_ASSERT( test_offset_idx - last_idx == 13 );
}
/* END_CASE */
/* BEGIN_CASE depends_on:POLARSSL_FS_IO */
void ctr_drbg_seed_file( char *path, int ret )
{
ctr_drbg_context ctx;
TEST_ASSERT( ctr_drbg_init( &ctx, rnd_std_rand, NULL, NULL, 0 ) == 0 );
TEST_ASSERT( ctr_drbg_write_seed_file( &ctx, path ) == ret );
TEST_ASSERT( ctr_drbg_update_seed_file( &ctx, path ) == ret );
}
/* END_CASE */
/* BEGIN_CASE depends_on:POLARSSL_SELF_TEST */
void ctr_drbg_selftest( )
{