Implement psa_generate_random
diff --git a/tests/suites/test_suite_psa_crypto.function b/tests/suites/test_suite_psa_crypto.function
index 9dbf034..c1d0e14 100644
--- a/tests/suites/test_suite_psa_crypto.function
+++ b/tests/suites/test_suite_psa_crypto.function
@@ -1520,3 +1520,44 @@
mbedtls_psa_crypto_free( );
}
/* END_CASE */
+
+/* BEGIN_CASE */
+void generate_random( int bytes, int retries )
+{
+ const unsigned char trail[] = "foobar";
+ unsigned char *buffer1 = mbedtls_calloc( 1, bytes + sizeof( trail ) );
+ unsigned char *buffer2 = mbedtls_calloc( 1, bytes );
+
+ TEST_ASSERT( buffer1 != NULL );
+ TEST_ASSERT( buffer2 != NULL );
+ memcpy( buffer1 + bytes, trail, sizeof( trail ) );
+
+ TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );
+
+ TEST_ASSERT( psa_generate_random( buffer1, bytes ) == PSA_SUCCESS );
+
+ /* Check that no more than bytes have been overwritten */
+ TEST_ASSERT( memcmp( buffer1 + bytes, trail, sizeof( trail ) ) == 0 );
+
+ if( bytes == 0 )
+ goto exit;
+
+ /* We can't validate that the data is really random, but we can
+ * validate that it doesn't repeat between calls. There's a
+ * 1/256^bytes chance that it does repeat, of course, so allow
+ * a few retries. */
+ ++retries; /* The first time isn't a REtry */
+ do
+ {
+ --retries;
+ TEST_ASSERT( psa_generate_random( buffer2, bytes ) == PSA_SUCCESS );
+ }
+ while( memcmp( buffer1, buffer2, bytes ) == 0 && retries >= -1 );
+ TEST_ASSERT( retries >= 0 );
+
+exit:
+ mbedtls_psa_crypto_free( );
+ mbedtls_free( buffer1 );
+ mbedtls_free( buffer2 );
+}
+/* END_CASE */