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39 lines
1.5 KiB
C++
39 lines
1.5 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef THIRD_PARTY_NEARBY_INTERNAL_CRYPTO_SECURE_UTIL_H_
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#define THIRD_PARTY_NEARBY_INTERNAL_CRYPTO_SECURE_UTIL_H_
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#include <stddef.h>
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#include "internal/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 // THIRD_PARTY_NEARBY_INTERNAL_CRYPTO_SECURE_UTIL_H_
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