#include <tommath.h>
#ifdef BN_MP_INVMOD_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis
 *
 * LibTomMath is a library that provides multiple-precision
 * integer arithmetic as well as number theoretic functionality.
 *
 * The library was designed directly after the MPI library by
 * Michael Fromberger but has been written from scratch with
 * additional optimizations in place.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 *
 * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
 */

/* hac 14.61, pp608 */
int mp_invmod(mp_int * a, mp_int * b, mp_int * c)
{
	/* b cannot be negative */
	if (b->sign == MP_NEG || mp_iszero(b) == 1) {
		return MP_VAL;
	}
#ifdef BN_FAST_MP_INVMOD_C
	/* if the modulus is odd we can use a faster routine instead */
	if (mp_isodd(b) == 1) {
		return fast_mp_invmod(a, b, c);
	}
#endif

#ifdef BN_MP_INVMOD_SLOW_C
	return mp_invmod_slow(a, b, c);
#endif

	return MP_VAL;
}
#endif

/* $Source: /cvs/libtom/libtommath/bn_mp_invmod.c,v $ */
/* $Revision: 1.4 $ */
/* $Date: 2006/12/28 01:25:13 $ */