/*

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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 https://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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