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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 https://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 <stdbool.h> #include <isc/types.h> #include <stdlib.h> ISC_LANG_BEGINDECLS bool isc_safe_memequal(const void *s1, const void *s2, size_t n); /*%< * Returns true iff. two blocks of memory are equal, otherwise * false. * */ int isc_safe_memcompare(const void *b1, const void *b2, size_t len); /*%< * Clone of libc memcmp() which is safe to differential timing attacks. */ void isc_safe_memwipe(void *ptr, size_t 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 */