CRYPTO_MEMCMP
Section: OpenSSL (3)
Updated: 2020-07-28
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NAME
CRYPTO_memcmp - Constant time memory comparison
SYNOPSIS
#include <openssl/crypto.h>
int CRYPTO_memcmp(const void *a, const void *b, size_t len);
DESCRIPTION
The CRYPTO_memcmp function compares the
len bytes pointed to by
a and
b
for equality.
It takes an amount of time dependent on
len, but independent of the
contents of the memory regions pointed to by
a and
b.
RETURN VALUES
CRYPTO_memcmp() returns 0 if the memory regions are equal and non-zero
otherwise.
NOTES
Unlike
memcmp(2), this function cannot be used to order the two memory regions
as the return value when they differ is undefined, other than being non-zero.
COPYRIGHT
Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the ``License''). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.