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1 | =pod |
2 | ||
3 | =head1 NAME | |
4 | ||
4d524e10 | 5 | BN_mod_inverse - compute inverse modulo n |
dd8dec69 UM |
6 | |
7 | =head1 SYNOPSIS | |
8 | ||
9 | #include <openssl/bn.h> | |
10 | ||
4d524e10 | 11 | BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n, |
e9b77246 | 12 | BN_CTX *ctx); |
dd8dec69 UM |
13 | |
14 | =head1 DESCRIPTION | |
15 | ||
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. | |
19 | ||
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>. | |
22 | ||
23 | =head1 RETURN VALUES | |
24 | ||
25 | BN_mod_inverse() returns the B<BIGNUM> containing the inverse, and | |
9b86974e | 26 | NULL on error. The error codes can be obtained by L<ERR_get_error(3)>. |
dd8dec69 UM |
27 | |
28 | =head1 SEE ALSO | |
29 | ||
9e183d22 | 30 | L<ERR_get_error(3)>, L<BN_add(3)> |
dd8dec69 | 31 | |
e2f92610 RS |
32 | =head1 COPYRIGHT |
33 | ||
9e183d22 | 34 | Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved. |
e2f92610 | 35 | |
4746f25a | 36 | Licensed under the Apache License 2.0 (the "License"). You may not use |
e2f92610 RS |
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>. | |
40 | ||
41 | =cut |