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30 lines
1.0 KiB
C
30 lines
1.0 KiB
C
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CRYPTO_SECURE_UTIL_H_
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#define CRYPTO_SECURE_UTIL_H_
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#include <stddef.h>
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#include "crypto/crypto_export.h"
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namespace crypto {
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// Performs a constant-time comparison of two strings, returning true if the
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// strings are equal.
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//
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// For cryptographic operations, comparison functions such as memcmp() may
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// expose side-channel information about input, allowing an attacker to
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// perform timing analysis to determine what the expected bits should be. In
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// order to avoid such attacks, the comparison must execute in constant time,
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// so as to not to reveal to the attacker where the difference(s) are.
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// For an example attack, see
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// http://groups.google.com/group/keyczar-discuss/browse_thread/thread/5571eca0948b2a13
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CRYPTO_EXPORT bool SecureMemEqual(const void* s1, const void* s2, size_t n);
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} // namespace crypto
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#endif // CRYPTO_SECURE_UTIL_H_
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