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       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.


       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 <>.