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46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/**
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* Constant-time functions
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* 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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* http://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, WITHOUT
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* 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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*/
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#ifndef MBEDTLS_CONSTANT_TIME_H
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#define MBEDTLS_CONSTANT_TIME_H
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#include <stddef.h>
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/** Constant-time buffer comparison without branches.
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*
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* This is equivalent to the standard memcmp function, but is likely to be
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* compiled to code using bitwise operation rather than a branch.
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*
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* This function can be used to write constant-time code by replacing branches
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* with bit operations using masks.
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*
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* \param a Pointer to the first buffer.
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* \param b Pointer to the second buffer.
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* \param n The number of bytes to compare in the buffer.
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*
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* \return Zero if the content of the two buffer is the same,
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* otherwise non-zero.
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*/
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int mbedtls_ct_memcmp( const void *a,
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const void *b,
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size_t n );
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#endif /* MBEDTLS_CONSTANT_TIME_H */
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