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/** \ingroup RSA_m
* \file rsa.c
*
* RSA Encryption & signature scheme, code.
*/
/*
* Copyright (c) 2000, 2001 Virtual Unlimited B.V.
*
* Author: Bob Deblier <bob@virtualunlimited.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#define BEECRYPT_DLL_EXPORT
#include "rsa.h"
#include "mp32.h"
#if HAVE_STDLIB_H
# include <stdlib.h>
#endif
#if HAVE_MALLOC_H
# include <malloc.h>
#endif
int rsapri(const rsakp* kp, const mp32number* m, mp32number* c)
{
register uint32 size = kp->n.size;
register uint32* temp = (uint32*) malloc((4*size+2) * sizeof(*temp));
if (temp)
{
mp32nsize(c, size);
mp32bpowmod_w(&kp->n, m->size, m->data, kp->d.size, kp->d.data, c->data, temp);
free(temp);
return 0;
}
return -1;
}
/*@-nullpass -nullptrarith @*/ /* temp may be NULL */
/* this routine doesn't work yet: needs debugging! */
int rsapricrt(const rsakp* kp, const mp32number* m, mp32number* c)
{
register uint32 nsize = kp->n.size;
register uint32 psize = kp->p.size;
register uint32 qsize = kp->q.size;
register uint32* temp = (uint32*) malloc((psize+qsize+(5*nsize+6))*sizeof(*temp));
register uint32* wksp = temp+psize+qsize+nsize;
/* compute j1 = m^d1 mod p */
if (mp32gex(psize, kp->p.modl, m->size, m->data))
{
mp32setx(nsize, temp+psize+qsize, m->size, m->data);
/*@-compdef@*/ /* LCL: temp+psize+qsize */
mp32bmod_w(&kp->p, temp+psize+qsize, temp, wksp);
/*@=compdef@*/
}
else
mp32setx(psize, temp, m->size, m->data);
mp32bpowmod_w(&kp->p, psize, temp, kp->d1.size, kp->d1.data, temp, wksp);
/* compute j2 = m^d2 mod q */
if (mp32gex(qsize, kp->q.modl, m->size, m->data))
{
mp32setx(nsize, temp+psize+qsize, m->size, m->data);
/*@-compdef@*/ /* LCL: temp+psize+qsize */
mp32bmod_w(&kp->q, temp+psize+qsize, temp+psize, wksp);
/*@=compdef@*/
}
else
mp32setx(qsize, temp+psize, m->size, m->data);
mp32bpowmod_w(&kp->q, qsize, temp+psize, kp->d2.size, kp->d2.data, temp+psize, wksp);
/* compute j1-j2 */
(void) mp32subx(psize, temp, qsize, temp+psize);
/* compute h = c*(j1-j2) mod p */
mp32bmulmod_w(&kp->p, psize, temp, psize, kp->c.data, temp, wksp);
/* make sure the signature gets the proper size */
mp32nsize(c, nsize);
/* compute s = h*q + j2 */
mp32mul(c->data, psize, temp, qsize, kp->q.modl);
(void) mp32addx(nsize, c->data, qsize, temp+psize);
free(temp);
return -1;
}
/*@=nullpass =nullptrarith @*/
/**
* @return 1 if signature verifies, 0 otherwise (can also indicate errors)
*/
int rsavrfy(const rsapk* pk, const mp32number* m, const mp32number* c)
{
int rc;
register uint32 size = pk->n.size;
register uint32* temp = (uint32*) malloc((5*size+2) * sizeof(*temp));
if (temp)
{
mp32bpowmod_w(&pk->n, c->size, c->data, pk->e.size, pk->e.data, temp, temp+size);
rc = mp32eqx(size, temp, m->size, m->data);
free(temp);
return rc;
}
return 0;
}
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