log if a crypto algorithm does not support a given key size

src/libstrongswan/crypto/crypto_tester.c

@@ -188,7 +188,9 @@ METHOD(crypto_tester_t, test_crypter, bool,
 		}
 		crypter = create(alg, vector->key_size);
 		if (!crypter)
-		{	/* key size not supported... */
+		{	DBG1(DBG_LIB, "%N[%s]: %u bit key size not supported",
+				 encryption_algorithm_names, alg, plugin_name,
+				 BITS_PER_BYTE * vector->key_size);
 			continue;
 		}