BN_MOD_INVERSE
Section: OpenSSL (3)
Updated: 2020-07-28
Page Index
NAME
BN_mod_inverse - compute inverse modulo n
SYNOPSIS
#include <openssl/bn.h>
BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n,
BN_CTX *ctx);
DESCRIPTION
BN_mod_inverse() computes the inverse of
a modulo
n
places the result in
r (
"(a*r)%n==1"). If
r is
NULL,
a new
BIGNUM is created.
ctx is a previously allocated BN_CTX used for temporary
variables. r may be the same BIGNUM as a or n.
RETURN VALUES
BN_mod_inverse() returns the
BIGNUM containing the inverse, and
NULL on error. The error codes can be obtained by
ERR_get_error(3).
SEE ALSO
ERR_get_error(3),
BN_add(3)
COPYRIGHT
Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (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>.