CRYPTO_memcmp - Constant time memory comparison
#include <openssl/crypto.h>
int CRYPTO_memcmp(const void *a, const void *b, size_t len);
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.
CRYPTO_memcmp()
returns 0 if the memory regions are equal and non-zero
otherwise.
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.
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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.