42 lines
1.0 KiB
Plaintext
42 lines
1.0 KiB
Plaintext
|
=pod
|
||
|
|
|
||
|
|
=head1 NAME
|
||
|
|
|
||
|
|
BN_mod_inverse - compute inverse modulo n
|
||
|
|
|
||
|
|
=head1 SYNOPSIS
|
||
|
|
|
||
|
|
#include <openssl/bn.h>
|
||
|
|
|
||
|
|
BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n,
|
||
|
|
BN_CTX *ctx);
|
||
|
|
|
||
|
|
=head1 DESCRIPTION
|
||
|
|
|
||
|
|
BN_mod_inverse() computes the inverse of B<a> modulo B<n>
|
||
|
|
places the result in B<r> (C<(a*r)%n==1>). If B<r> is NULL,
|
||
|
|
a new B<BIGNUM> is created.
|
||
|
|
|
||
|
|
B<ctx> is a previously allocated B<BN_CTX> used for temporary
|
||
|
|
variables. B<r> may be the same B<BIGNUM> as B<a> or B<n>.
|
||
|
|
|
||
|
|
=head1 RETURN VALUES
|
||
|
|
|
||
|
|
BN_mod_inverse() returns the B<BIGNUM> containing the inverse, and
|
||
|
|
NULL on error. The error codes can be obtained by L<ERR_get_error(3)>.
|
||
|
|
|
||
|
|
=head1 SEE ALSO
|
||
|
|
|
||
|
|
L<ERR_get_error(3)>, L<BN_add(3)>
|
||
|
|
|
||
|
|
=head1 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
|
||
|
|
L<https://www.openssl.org/source/license.html>.
|
||
|
|
|
||
|
|
=cut
|