/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include "os.h"#include <mp.h>#include <libsec.h> mpint*egdecrypt(EGpriv *priv, mpint *in, mpint *out){	EGpub *pub = &priv->pub;	mpint *gamma, *delta;	mpint *p = pub->p;	int plen = mpsignif(p)+1;	int shift = ((plen+Dbits-1)/Dbits)*Dbits; 	if(out == nil)		out = mpnew(0);	gamma = mpnew(0);	delta = mpnew(0);	mpright(in, shift, gamma);	mpleft(gamma, shift, delta);	mpsub(in, delta, delta);		mpexp(gamma, priv->secret, p, out);	mpinvert(out, p, gamma);	mpmul(gamma, delta, out);	mpmod(out, p, out);	mpfree(gamma);	mpfree(delta);	return out;}