BN_mod_inverse3ssl
Compute inverse modulo n
Usage
#include <openssl/bn.h>BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n,BN_CTX *ctx);
Overview
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).
Releases
13 releases since Debian 3.0 (Woody); the text changed 12 times.