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Add tests to ensure that we gather as much entropy as expected

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There were tests to ensure that each entropy source reaches its
threshold, but no test that covers the total amount of entropy. Add
test cases with a known set of entropy sources and make sure that we
always gather at least MBEDTLS_ENTROPY_BLOCK_SIZE bytes from a strong
source.
This commit is contained in:
Gilles Peskine 2019-10-08 15:01:34 +02:00
parent 7f246510d0
commit 65fc0686a7
2 changed files with 61 additions and 0 deletions
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18
tests/suites/test_suite_entropy.data
View File

@ -43,6 +43,24 @@ entropy_threshold:16:0:MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
Entropy threshold: 1024 never reached Entropy threshold: 1024 never reached
entropy_threshold:1024:1:MBEDTLS_ERR_ENTROPY_SOURCE_FAILED entropy_threshold:1024:1:MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
Entropy calls: no strong
entropy_calls:MBEDTLS_ENTROPY_SOURCE_WEAK:MBEDTLS_ENTROPY_SOURCE_WEAK:1:MBEDTLS_ENTROPY_BLOCK_SIZE:MBEDTLS_ERR_ENTROPY_NO_STRONG_SOURCE
Entropy calls: 1 strong, 1*BLOCK_SIZE
entropy_calls:MBEDTLS_ENTROPY_SOURCE_STRONG:MBEDTLS_ENTROPY_SOURCE_WEAK:1:MBEDTLS_ENTROPY_BLOCK_SIZE:1
Entropy calls: 1 strong, 2*(BLOCK_SIZE/2)
entropy_calls:MBEDTLS_ENTROPY_SOURCE_STRONG:MBEDTLS_ENTROPY_SOURCE_WEAK:1:(MBEDTLS_ENTROPY_BLOCK_SIZE+1)/2:2
Entropy calls: 1 strong, BLOCK_SIZE*1
entropy_calls:MBEDTLS_ENTROPY_SOURCE_STRONG:MBEDTLS_ENTROPY_SOURCE_WEAK:1:1:MBEDTLS_ENTROPY_BLOCK_SIZE
Entropy calls: 1 strong, 2*BLOCK_SIZE to reach threshold
entropy_calls:MBEDTLS_ENTROPY_SOURCE_STRONG:MBEDTLS_ENTROPY_SOURCE_WEAK:MBEDTLS_ENTROPY_BLOCK_SIZE+1:MBEDTLS_ENTROPY_BLOCK_SIZE:2
Entropy calls: 2 strong, BLOCK_SIZE/2 each
entropy_calls:MBEDTLS_ENTROPY_SOURCE_STRONG:MBEDTLS_ENTROPY_SOURCE_WEAK:(MBEDTLS_ENTROPY_BLOCK_SIZE+1)/2:(MBEDTLS_ENTROPY_BLOCK_SIZE+1)/2:2
Check NV seed standard IO Check NV seed standard IO
entropy_nv_seed_std_io: entropy_nv_seed_std_io:

43
tests/suites/test_suite_entropy.function
View File

@ -286,6 +286,49 @@ exit:
} }
/* END_CASE */ /* END_CASE */
/* BEGIN_CASE */
void entropy_calls( int strength1, int strength2,
int threshold, int chunk_size,
int result )
{
/*
* if result >= 0: result = expected number of calls to source 1
* if result < 0: result = expected return code from mbedtls_entropy_func()
*/
mbedtls_entropy_context ctx;
entropy_dummy_context dummy1 = {DUMMY_CONSTANT_LENGTH, chunk_size, 0};
entropy_dummy_context dummy2 = {DUMMY_CONSTANT_LENGTH, chunk_size, 0};
unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 };
int ret;
mbedtls_entropy_init( &ctx );
entropy_clear_sources( &ctx );
TEST_ASSERT( mbedtls_entropy_add_source( &ctx, entropy_dummy_source,
&dummy1, threshold,
strength1 ) == 0 );
TEST_ASSERT( mbedtls_entropy_add_source( &ctx, entropy_dummy_source,
&dummy2, threshold,
strength2 ) == 0 );
ret = mbedtls_entropy_func( &ctx, buf, sizeof( buf ) );
if( result >= 0 )
{
TEST_ASSERT( ret == 0 );
TEST_ASSERT( dummy1.calls == (size_t) result );
}
else
{
TEST_ASSERT( ret == result );
}
exit:
mbedtls_entropy_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_ENTROPY_NV_SEED:MBEDTLS_FS_IO */ /* BEGIN_CASE depends_on:MBEDTLS_ENTROPY_NV_SEED:MBEDTLS_FS_IO */
void nv_seed_file_create( ) void nv_seed_file_create( )
{ {