constant_time.h File Reference

#include <stddef.h>

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Functions
int	mbedtls_ct_memcmp (const void *a, const void *b, size_t n)

Function Documentation

mbedtls_ct_memcmp()

int mbedtls_ct_memcmp	(	const void *	a,
		const void *	b,
		size_t	n
	)

Constant-time functions

Copyright The Mbed TLS Contributors SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later 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.

Parameters

a	Pointer to the first buffer.
b	Pointer to the second buffer.
n	The number of bytes to compare in the buffer.

Returns

Zero if the content of the two buffer is the same, otherwise non-zero.