BN_mod_inverse.3ssl

Langue: en

Version: 2002-09-25 (fedora - 06/07/09)

Section: 3 (Bibliothèques de fonctions)

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 or 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

bn(3), ERR_get_error(3), BN_add(3)

HISTORY

BN_mod_inverse() is available in all versions of SSLeay and OpenSSL.