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/* BEGIN_HEADER */
/** \file test_suite_constant_time.function
*
* Functional testing of functions in the constant_time module.
*
* The tests are instrumented with #TEST_CF_SECRET and #TEST_CF_PUBLIC
* (see tests/include/test/constant_flow.h) so that running the tests
* under MSan or Valgrind will detect a non-constant-time implementation.
*/
#include <mbedtls/constant_time.h>
#include <constant_time_internal.h>
#include <constant_time_invasive.h>
#include <test/constant_flow.h>
/* END_HEADER */
/* BEGIN_CASE depends_on:MBEDTLS_SSL_SOME_SUITES_USE_TLS_CBC:MBEDTLS_TEST_HOOKS */
void ssl_cf_memcpy_offset( int offset_min, int offset_max, int len )
{
unsigned char *dst = NULL;
unsigned char *src = NULL;
size_t src_len = offset_max + len;
size_t secret;
ASSERT_ALLOC( dst, len );
ASSERT_ALLOC( src, src_len );
/* Fill src in a way that we can detect if we copied the right bytes */
mbedtls_test_rnd_std_rand( NULL, src, src_len );
for( secret = offset_min; secret <= (size_t) offset_max; secret++ )
{
mbedtls_test_set_step( (int) secret );
TEST_CF_SECRET( &secret, sizeof( secret ) );
mbedtls_ct_memcpy_offset( dst, src, secret,
offset_min, offset_max, len );
TEST_CF_PUBLIC( &secret, sizeof( secret ) );
TEST_CF_PUBLIC( dst, len );
ASSERT_COMPARE( dst, len, src + secret, len );
}
exit:
mbedtls_free( dst );
mbedtls_free( src );
}
/* END_CASE */
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