=pod =head1 NAME BN_mod_inverse - compute inverse modulo n =head1 SYNOPSIS #include BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n, BN_CTX *ctx); =head1 DESCRIPTION BN_mod_inverse() computes the inverse of B modulo B places the result in B (C<(a*r)%n==1>). If B is NULL, a new B is created. B is a previously allocated B used for temporary variables. B may be the same B as B or B. =head1 RETURN VALUES BN_mod_inverse() returns the B containing the inverse, and NULL on error. The error codes can be obtained by L. =head1 SEE ALSO L, L =head1 COPYRIGHT Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved. Licensed under the Apache License 2.0 (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. =cut