CRYPTO_MEMCMP

Section: OpenSSL (3)
Updated: 2020-04-23
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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>.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
NOTES
COPYRIGHT
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