1 // Copyright 2015 The Weave Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef LIBUWEAVE_SRC_CRYPTO_UTILS_H_ 6 #define LIBUWEAVE_SRC_CRYPTO_UTILS_H_ 7 8 #include <stdbool.h> 9 #include <stddef.h> 10 #include <stdint.h> 11 12 /** 13 * Check if two byte arrays are the same in constant time (the running time 14 * should only depend on the length of the given arrays). It's critical to use 15 * constant-time methods to compare secret data. Timing information can lead to 16 * full recovery of the secret data. 17 */ 18 bool uw_crypto_utils_equal_(const uint8_t* arr1, 19 const uint8_t* arr2, 20 size_t len); 21 22 #endif // LIBUWEAVE_SRC_CRYPTO_UTILS_H_ 23