5 BN_mod_inverse - compute inverse modulo n
9 #include <openssl/bn.h>
11 BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n,
16 BN_mod_inverse() computes the inverse of B<a> modulo B<n>
17 places the result in B<r> (C<(a*r)%n==1>). If B<r> is NULL,
18 a new B<BIGNUM> is created.
20 B<ctx> is a previously allocated B<BN_CTX> used for temporary
21 variables. B<r> may be the same B<BIGNUM> as B<a> or B<n>.
25 BN_mod_inverse() returns the B<BIGNUM> containing the inverse, and
26 NULL on error. The error codes can be obtained by L<ERR_get_error(3)>.
30 L<bn(3)>, L<ERR_get_error(3)>, L<BN_add(3)>
34 Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
36 Licensed under the OpenSSL license (the "License"). You may not use
37 this file except in compliance with the License. You can obtain a copy
38 in the file LICENSE in the source distribution or at
39 L<https://www.openssl.org/source/license.html>.