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/*
* rsakp.c
*
* RSA Keypair, code
*
* <conformance statement for IEEE P1363 needed here>
*
* Copyright (c) 2000 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 "rsakp.h"
#include "mp32prime.h"
#include "mp32.h"
#if HAVE_STDLIB_H
# include <stdlib.h>
#endif
#if HAVE_MALLOC_H
# include <malloc.h>
#endif
#if HAVE_STRING_H
# include <string.h>
#endif
int rsakpMake(rsakp* kp, randomGeneratorContext* rgc, int nsize)
{
/*
* Generates an RSA Keypair for use with the Chinese Remainder Theorem
*/
register uint32 pqsize = (nsize+1) >> 1;
register uint32* temp = (uint32*) malloc((16*pqsize+6)*sizeof(uint32));
register uint32 newn = 1;
if (temp)
{
mp32barrett r, psubone, qsubone, phi;
nsize = pqsize << 1;
/* set e */
mp32nsetw(&kp->e, 65535);
/* generate a random prime p and q */
mp32prnd_w(&kp->p, rgc, pqsize, mp32ptrials(pqsize << 5), &kp->e, temp);
mp32prnd_w(&kp->q, rgc, pqsize, mp32ptrials(pqsize << 5), &kp->e, temp);
/* if p <= q, perform a swap to make p larger than q */
if (mp32le(pqsize, kp->p.modl, kp->q.modl))
{
memcpy(&r, &kp->q, sizeof(mp32barrett));
memcpy(&kp->q, &kp->p, sizeof(mp32barrett));
memcpy(&kp->p, &r, sizeof(mp32barrett));
}
mp32bzero(&r);
mp32bzero(&psubone);
mp32bzero(&qsubone);
mp32bzero(&phi);
while (1)
{
mp32mul(temp, pqsize, kp->p.modl, pqsize, kp->q.modl);
if (newn && mp32msbset(nsize, temp))
break;
/* product of p and q doesn't have the required size (one bit short) */
mp32prnd_w(&r, rgc, pqsize, mp32ptrials(pqsize << 5), &kp->e, temp);
if (mp32le(pqsize, kp->p.modl, r.modl))
{
mp32bfree(&kp->q);
memcpy(&kp->q, &kp->p, sizeof(mp32barrett));
memcpy(&kp->p, &r, sizeof(mp32barrett));
mp32bzero(&r);
newn = 1;
}
else if (mp32le(pqsize, kp->q.modl, r.modl))
{
mp32bfree(&kp->q);
memcpy(&kp->q, &r, sizeof(mp32barrett));
mp32bzero(&r);
newn = 1;
}
else
{
mp32bfree(&r);
newn = 0;
}
}
mp32bset(&kp->n, nsize, temp);
/* compute p-1 */
mp32bsubone(&kp->p, temp);
mp32bset(&psubone, pqsize, temp);
/* compute q-1 */
mp32bsubone(&kp->q, temp);
mp32bset(&qsubone, pqsize, temp);
/* compute phi = (p-1)*(q-1) */
mp32mul(temp, pqsize, psubone.modl, pqsize, qsubone.modl);
mp32bset(&phi, nsize, temp);
/* compute d = inv(e) mod phi */
mp32nsize(&kp->d, nsize);
mp32binv_w(&phi, kp->e.size, kp->e.data, kp->d.data, temp);
/* compute d1 = d mod (p-1) */
mp32nsize(&kp->d1, pqsize);
mp32bmod_w(&psubone, kp->d.data, kp->d1.data, temp);
/* compute d2 = d mod (q-1) */
mp32nsize(&kp->d2, pqsize);
mp32bmod_w(&qsubone, kp->d.data, kp->d2.data, temp);
/* compute c = inv(q) mod p */
mp32nsize(&kp->c, pqsize);
mp32binv_w(&kp->p, pqsize, kp->q.modl, kp->c.data, temp);
free(temp);
return 0;
}
return -1;
}
int rsakpInit(rsakp* kp)
{
memset(kp, 0, sizeof(rsakp));
/* or
mp32bzero(&kp->n);
mp32nzero(&kp->e);
mp32nzero(&kp->d);
mp32bzero(&kp->p);
mp32bzero(&kp->q);
mp32nzero(&kp->d1);
mp32nzero(&kp->d2);
mp32nzero(&kp->c);
*/
return 0;
}
int rsakpFree(rsakp* kp)
{
mp32bfree(&kp->n);
mp32nfree(&kp->e);
mp32nfree(&kp->d);
mp32bfree(&kp->p);
mp32bfree(&kp->q);
mp32nfree(&kp->d1);
mp32nfree(&kp->d2);
mp32nfree(&kp->c);
return 0;
}
int rsakpCopy(rsakp* dst, const rsakp* src)
{
mp32bcopy(&dst->n, &src->n);
mp32ncopy(&dst->e, &src->e);
mp32ncopy(&dst->d, &src->d);
mp32bcopy(&dst->p, &src->p);
mp32bcopy(&dst->q, &src->q);
mp32ncopy(&dst->d1, &src->d1);
mp32ncopy(&dst->d2, &src->d2);
mp32ncopy(&dst->c, &src->c);
return 0;
}
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