54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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#ifndef ISC_SAFE_H
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#define ISC_SAFE_H 1
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/*! \file isc/safe.h */
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#include <stdbool.h>
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#include <isc/types.h>
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#include <stdlib.h>
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ISC_LANG_BEGINDECLS
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bool
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isc_safe_memequal(const void *s1, const void *s2, size_t n);
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/*%<
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* Returns true iff. two blocks of memory are equal, otherwise
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* false.
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*
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*/
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int
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isc_safe_memcompare(const void *b1, const void *b2, size_t len);
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/*%<
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* Clone of libc memcmp() which is safe to differential timing attacks.
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*/
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void
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isc_safe_memwipe(void *ptr, size_t len);
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/*%<
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* Clear the memory of length `len` pointed to by `ptr`.
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*
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* Some crypto code calls memset() on stack allocated buffers just
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* before return so that they are wiped. Such memset() calls can be
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* optimized away by the compiler. We provide this external non-inline C
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* function to perform the memset operation so that the compiler cannot
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* infer about what the function does and optimize the call away.
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*/
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ISC_LANG_ENDDECLS
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#endif /* ISC_SAFE_H */
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