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Command: CRYPTO_memcmp | Section: 3 | Source: OpenBSD | File: CRYPTO_memcmp.3
CRYPTO_MEMCMP(3) FreeBSD Library Functions Manual CRYPTO_MEMCMP(3)
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
CRYPTO_memcmp() 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 content of the memory regions is equal
or non-zero otherwise.
HISTORY
CRYPTO_memcmp() first appeared in OpenSSL 1.0.1d and has been available
since OpenBSD 5.6.
BUGS
Unlike memcmp(3) and timingsafe_memcmp(3), this function cannot be used
to order the two memory regions. In the current implementation, the
return value is always greater than or equal to 0.
FreeBSD 14.1-RELEASE-p8 August 25, 2019 FreeBSD 14.1-RELEASE-p8