364e63f12a
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@18092 ec53bebd-3082-4978-b11e-865c3cabbd6b
354 lines
7.2 KiB
C
354 lines
7.2 KiB
C
/*
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* Copyright (c) 2006 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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RCSID("$Id$");
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#include <stdio.h>
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#include <stdlib.h>
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#include <krb5-types.h>
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#include <assert.h>
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#include <rsa.h>
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#include <roken.h>
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#include "imath/imath.h"
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#include "imath/rsamath.h"
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static void
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BN2mpz(mpz_t *s, const BIGNUM *bn)
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{
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size_t len;
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void *p;
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mp_int_init(s);
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len = BN_num_bytes(bn);
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p = malloc(len);
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BN_bn2bin(bn, p);
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mp_int_read_unsigned(s, p, len);
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free(p);
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}
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static int
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imath_rsa_public_encrypt(int flen, const unsigned char* from,
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unsigned char* to, RSA* rsa, int padding)
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{
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unsigned char *p, *p0;
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mp_result res;
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size_t size, padlen;
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mpz_t enc, dec, n, e;
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if (padding != RSA_PKCS1_PADDING)
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return -1;
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size = RSA_size(rsa);
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if (size < RSA_PKCS1_PADDING_SIZE || size - RSA_PKCS1_PADDING_SIZE < flen)
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return -1;
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BN2mpz(&n, rsa->n);
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BN2mpz(&e, rsa->e);
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p = p0 = malloc(size - 1);
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if (p0 == NULL) {
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mp_int_clear(&e);
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mp_int_clear(&n);
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return -1;
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}
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padlen = size - flen - 3;
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assert(padlen >= 8);
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*p++ = 2;
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if (RAND_bytes(p, padlen) != 1) {
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mp_int_clear(&e);
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mp_int_clear(&n);
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free(p0);
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return -1;
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}
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while(padlen) {
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if (*p == 0)
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*p = 1;
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padlen--;
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p++;
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}
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*p++ = 0;
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memcpy(p, from, flen);
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p += flen;
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assert((p - p0) == size - 1);
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mp_int_init(&enc);
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mp_int_init(&dec);
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mp_int_read_unsigned(&dec, p0, size - 1);
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free(p0);
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res = rsa_rsaep(&dec, &e, &n, &enc);
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mp_int_clear(&dec);
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mp_int_clear(&e);
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mp_int_clear(&n);
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{
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size_t ssize;
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ssize = mp_int_unsigned_len(&enc);
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assert(size >= ssize);
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mp_int_to_unsigned(&enc, to, ssize);
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size = ssize;
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}
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mp_int_clear(&enc);
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return size;
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}
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static int
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imath_rsa_public_decrypt(int flen, const unsigned char* from,
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unsigned char* to, RSA* rsa, int padding)
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{
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unsigned char *p;
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mp_result res;
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size_t size;
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mpz_t s, us, n, e;
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if (padding != RSA_PKCS1_PADDING)
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return -1;
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if (flen != RSA_size(rsa))
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return -1;
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BN2mpz(&n, rsa->n);
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BN2mpz(&e, rsa->e);
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#if 0
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/* Check that the exponent is larger then 3 */
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if (mp_int_compare_value(&e, 3) <= 0) {
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mp_int_clear(&n);
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mp_int_clear(&e);
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return -1;
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}
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#endif
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mp_int_init(&s);
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mp_int_init(&us);
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mp_int_read_unsigned(&s, rk_UNCONST(from), flen);
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if (mp_int_compare(&s, &n) >= 0) {
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mp_int_clear(&n);
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mp_int_clear(&e);
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return -1;
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}
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res = rsa_rsavp(&s, &e, &n, &us);
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mp_int_clear(&s);
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mp_int_clear(&n);
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mp_int_clear(&e);
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if (res != MP_OK)
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return -1;
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p = to;
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size = mp_int_unsigned_len(&us);
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assert(size <= RSA_size(rsa));
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mp_int_to_unsigned(&us, p, size);
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mp_int_clear(&us);
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/* head zero was skipped by mp_int_to_unsigned */
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if (*p != 1)
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return -1;
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size--; p++;
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while (size && *p == 0xff) {
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size--; p++;
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}
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if (size == 0 || *p != 0)
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return -1;
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size--; p++;
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memmove(to, p, size);
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return size;
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}
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static int
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imath_rsa_private_encrypt(int flen, const unsigned char* from,
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unsigned char* to, RSA* rsa, int padding)
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{
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unsigned char *p, *p0;
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mp_result res;
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size_t size;
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mpz_t s, us, n, d;
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if (padding != RSA_PKCS1_PADDING)
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return -1;
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size = RSA_size(rsa);
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if (size < RSA_PKCS1_PADDING_SIZE || size - RSA_PKCS1_PADDING_SIZE < flen)
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return -1;
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BN2mpz(&n, rsa->n);
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BN2mpz(&d, rsa->d);
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p0 = p = malloc(size);
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*p++ = 0;
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*p++ = 1;
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memset(p, 0xff, size - flen - 3);
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p += size - flen - 3;
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*p++ = 0;
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memcpy(p, from, flen);
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p += flen;
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assert((p - p0) == size);
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mp_int_init(&s);
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mp_int_init(&us);
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mp_int_read_unsigned(&us, p0, size);
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free(p0);
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/* XXX insert pre-image keyblinding here */
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res = rsa_rsasp(&us, &d, &n, &s);
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/* XXX insert post-image keyblinding here */
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mp_int_clear(&d);
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mp_int_clear(&n);
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mp_int_clear(&us);
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{
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size_t ssize;
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ssize = mp_int_unsigned_len(&s);
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assert(size >= ssize);
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mp_int_to_unsigned(&s, to, size);
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}
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mp_int_clear(&s);
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return size;
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}
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static int
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imath_rsa_private_decrypt(int flen, const unsigned char* from,
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unsigned char* to, RSA* rsa, int padding)
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{
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unsigned char *p;
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mp_result res;
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size_t size;
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mpz_t enc, dec, n, d;
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if (padding != RSA_PKCS1_PADDING)
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return -1;
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size = RSA_size(rsa);
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if (flen != size)
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return -1;
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mp_int_init(&enc);
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mp_int_init(&dec);
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BN2mpz(&n, rsa->n);
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BN2mpz(&d, rsa->d);
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res = mp_int_read_unsigned(&enc, rk_UNCONST(from), flen);
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/* XXX insert pre-image keyblinding here */
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res = rsa_rsadp(&enc, &d, &n, &dec);
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/* XXX insert post-image keyblinding here */
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mp_int_clear(&enc);
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mp_int_clear(&d);
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mp_int_clear(&n);
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p = to;
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{
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size_t ssize;
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ssize = mp_int_unsigned_len(&dec);
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assert(size >= ssize);
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mp_int_to_unsigned(&dec, p, ssize);
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size = ssize;
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}
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mp_int_clear(&dec);
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/* head zero was skipped by mp_int_to_unsigned */
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if (*p != 2)
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return -1;
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size--; p++;
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while (size && *p != 0) {
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size--; p++;
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}
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if (size == 0)
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return -1;
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size--; p++;
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memmove(to, p, size);
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return size;
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}
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static int
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imath_rsa_init(RSA *rsa)
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{
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return 1;
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}
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static int
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imath_rsa_finish(RSA *rsa)
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{
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return 1;
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}
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const RSA_METHOD hc_rsa_imath_method = {
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"hcrypto imath RSA",
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imath_rsa_public_encrypt,
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imath_rsa_public_decrypt,
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imath_rsa_private_encrypt,
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imath_rsa_private_decrypt,
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NULL,
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NULL,
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imath_rsa_init,
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imath_rsa_finish,
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0,
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NULL,
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NULL,
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NULL
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};
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const RSA_METHOD *
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RSA_imath_method(void)
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{
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return &hc_rsa_imath_method;
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}
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