/*  * 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*egencrypt(EGpub *pub, mpint *in, mpint *out){	mpint *m, *k, *gamma, *delta, *pm1;	mpint *p = pub->p, *alpha = pub->alpha;	int plen = mpsignif(p);	int shift = ((plen+Dbits)/Dbits)*Dbits;	// in libcrypt version, (int)(LENGTH(pub->p)*sizeof(NumType)*CHARBITS); 	if(out == nil)		out = mpnew(0);	pm1 = mpnew(0);	m = mpnew(0);	gamma = mpnew(0);	delta = mpnew(0);	mpmod(in, p, m);	while(1){		k = mprand(plen, genrandom, nil);		if((mpcmp(mpone, k) <= 0) && (mpcmp(k, pm1) < 0))			break;	}	mpexp(alpha, k, p, gamma);	mpexp(pub->key, k, p, delta);	mpmul(m, delta, delta);	mpmod(delta, p, delta);	mpleft(gamma, shift, out);	mpadd(delta, out, out);	mpfree(pm1);	mpfree(m);	mpfree(k);	mpfree(gamma);	mpfree(delta);	return out;}