mirror of
https://github.com/cuberite/polarssl.git
synced 2025-11-03 20:22:59 -05:00
46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/**
|
|
* Constant-time functions
|
|
*
|
|
* Copyright The Mbed TLS Contributors
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
* not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#ifndef MBEDTLS_CONSTANT_TIME_H
|
|
#define MBEDTLS_CONSTANT_TIME_H
|
|
|
|
#include <stddef.h>
|
|
|
|
|
|
/** Constant-time buffer comparison without branches.
|
|
*
|
|
* This is equivalent to the standard memcmp function, but is likely to be
|
|
* compiled to code using bitwise operation rather than a branch.
|
|
*
|
|
* This function can be used to write constant-time code by replacing branches
|
|
* with bit operations using masks.
|
|
*
|
|
* \param a Pointer to the first buffer.
|
|
* \param b Pointer to the second buffer.
|
|
* \param n The number of bytes to compare in the buffer.
|
|
*
|
|
* \return Zero if the content of the two buffer is the same,
|
|
* otherwise non-zero.
|
|
*/
|
|
int mbedtls_ct_memcmp( const void *a,
|
|
const void *b,
|
|
size_t n );
|
|
|
|
#endif /* MBEDTLS_CONSTANT_TIME_H */
|