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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#ifndef ISC_SAFE_H
#define ISC_SAFE_H 1
/*! \file isc/safe.h */
#include <isc/boolean.h>
#include <isc/lang.h>
#include <openssl/crypto.h>
ISC_LANG_BEGINDECLS
#define isc_safe_memequal(s1, s2, n) ISC_TF(!CRYPTO_memcmp(s1, s2, n))
/*%<
* Returns ISC_TRUE iff. two blocks of memory are equal, otherwise
* ISC_FALSE.
*
*/
#define isc_safe_memwipe(ptr, len) OPENSSL_cleanse(ptr, len)
/*%<
* Clear the memory of length `len` pointed to by `ptr`.
*
* Some crypto code calls memset() on stack allocated buffers just
* before return so that they are wiped. Such memset() calls can be
* optimized away by the compiler. We provide this external non-inline C
* function to perform the memset operation so that the compiler cannot
* infer about what the function does and optimize the call away.
*/
ISC_LANG_ENDDECLS
#endif /* ISC_SAFE_H */