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RedHat 9 (Linux i386) - man page for bn_mod_inverse (redhat section 3)

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 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. 0.9.7a 2002-09-25 BN_mod_inverse(3)