BN_mod_inverse(3) - NetBSD Manual Pages

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BN_mod_inverse(3)                   OpenSSL                  BN_mod_inverse(3)




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.


NOTES

       It is an error to use the same BIGNUM as 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 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
       <https://www.openssl.org/source/license.html>.



3.0.15                            2024-09-03                 BN_mod_inverse(3)