Updated: 2022/Sep/29

Please read Privacy Policy. It's for your privacy.

CRYPTO_memcmp(3)                    OpenSSL                   CRYPTO_memcmp(3)



NAME
       CRYPTO_memcmp - Constant time memory comparison

LIBRARY
       libcrypto, -lcrypto

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 nonzero
       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 nonzero.

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>.



3.0.12                            2023-05-07                  CRYPTO_memcmp(3)