BN_mod_inverse(3)BN_mod_inverse(3)NAMEBN_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
The BN_mod_inverse() function computes the inverse of a modulo n and
places the result in r ((a*r)%n==1). If r is NULL, a new BIGNUM is cre‐
ated.
The ctx is a previously allocated BN_CTX used for temporary variables.
The r value may be the same BIGNUM as a or n.
RETURN VALUES
The BN_mod_inverse() function returns the BIGNUM containing the
inverse, and NULL on error. The error codes can be obtained by using
ERR_get_error().
HISTORY
The BN_mod_inverse() function is available in all versions of SSLeay
and OpenSSL.
SEE ALSO
Functions: bn(3), err(3), BN_add(3)BN_mod_inverse(3)