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Fix entropy_threshold when MBEDTLS_TEST_NULL_ENTROPY is enabled

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Don't use the default entropy sources so as not to depend on their
characteristics.
This commit is contained in:
Gilles Peskine 2019-11-25 19:50:54 +01:00
parent ae679390a2
commit cbd91e013c
1 changed files with 12 additions and 4 deletions
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16
tests/suites/test_suite_entropy.function
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@ -251,18 +251,26 @@ exit:
} }
/* END_CASE */ /* END_CASE */
/* BEGIN_CASE depends_on:ENTROPY_HAVE_STRONG */ /* BEGIN_CASE */
void entropy_threshold( int threshold, int chunk_size, int result ) void entropy_threshold( int threshold, int chunk_size, int result )
{ {
mbedtls_entropy_context ctx; mbedtls_entropy_context ctx;
entropy_dummy_context dummy = {DUMMY_CONSTANT_LENGTH, chunk_size, 0}; entropy_dummy_context strong =
{DUMMY_CONSTANT_LENGTH, MBEDTLS_ENTROPY_BLOCK_SIZE, 0};
entropy_dummy_context weak = {DUMMY_CONSTANT_LENGTH, chunk_size, 0};
unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 }; unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 };
int ret; int ret;
mbedtls_entropy_init( &ctx ); mbedtls_entropy_init( &ctx );
entropy_clear_sources( &ctx );
/* Set strong source that reaches its threshold immediately and
* a weak source whose threshold is a test parameter. */
TEST_ASSERT( mbedtls_entropy_add_source( &ctx, entropy_dummy_source, TEST_ASSERT( mbedtls_entropy_add_source( &ctx, entropy_dummy_source,
&dummy, threshold, &strong, 1,
MBEDTLS_ENTROPY_SOURCE_STRONG ) == 0 );
TEST_ASSERT( mbedtls_entropy_add_source( &ctx, entropy_dummy_source,
&weak, threshold,
MBEDTLS_ENTROPY_SOURCE_WEAK ) == 0 ); MBEDTLS_ENTROPY_SOURCE_WEAK ) == 0 );
ret = mbedtls_entropy_func( &ctx, buf, sizeof( buf ) ); ret = mbedtls_entropy_func( &ctx, buf, sizeof( buf ) );
@ -275,7 +283,7 @@ void entropy_threshold( int threshold, int chunk_size, int result )
* updates: before and after updating the NV seed. */ * updates: before and after updating the NV seed. */
result *= 2; result *= 2;
#endif #endif
TEST_ASSERT( dummy.calls == (size_t) result ); TEST_ASSERT( weak.calls == (size_t) result );
} }
else else
{ {