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-rw-r--r--source4/heimdal/lib/hcrypto/rsa-imath.c661
1 files changed, 661 insertions, 0 deletions
diff --git a/source4/heimdal/lib/hcrypto/rsa-imath.c b/source4/heimdal/lib/hcrypto/rsa-imath.c
new file mode 100644
index 0000000000..e05ead1e66
--- /dev/null
+++ b/source4/heimdal/lib/hcrypto/rsa-imath.c
@@ -0,0 +1,661 @@
+/*
+ * Copyright (c) 2006 - 2007 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+RCSID("$Id: rsa-imath.c 19750 2007-01-06 13:45:25Z lha $");
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <krb5-types.h>
+#include <assert.h>
+
+#include <rsa.h>
+
+#include <roken.h>
+
+#include "imath/imath.h"
+#include "imath/iprime.h"
+
+static void
+BN2mpz(mpz_t *s, const BIGNUM *bn)
+{
+ size_t len;
+ void *p;
+
+ mp_int_init(s);
+
+ len = BN_num_bytes(bn);
+ p = malloc(len);
+ BN_bn2bin(bn, p);
+ mp_int_read_unsigned(s, p, len);
+ free(p);
+}
+
+static BIGNUM *
+mpz2BN(mpz_t *s)
+{
+ size_t size;
+ BIGNUM *bn;
+ void *p;
+
+ size = mp_int_unsigned_len(s);
+ p = malloc(size);
+ if (p == NULL && size != 0)
+ return NULL;
+ mp_int_to_unsigned(s, p, size);
+
+ bn = BN_bin2bn(p, size, NULL);
+ free(p);
+ return bn;
+}
+
+static int random_num(mp_int, size_t);
+
+static void
+setup_blind(mp_int n, mp_int b, mp_int bi)
+{
+ mp_int_init(b);
+ mp_int_init(bi);
+ random_num(b, mp_int_count_bits(n));
+ mp_int_mod(b, n, b);
+ mp_int_invmod(b, n, bi);
+}
+
+static void
+blind(mp_int in, mp_int b, mp_int e, mp_int n)
+{
+ mpz_t t1;
+ mp_int_init(&t1);
+ /* in' = (in * b^e) mod n */
+ mp_int_exptmod(b, e, n, &t1);
+ mp_int_mul(&t1, in, in);
+ mp_int_mod(in, n, in);
+ mp_int_clear(&t1);
+}
+
+static void
+unblind(mp_int out, mp_int bi, mp_int n)
+{
+ /* out' = (out * 1/b) mod n */
+ mp_int_mul(out, bi, out);
+ mp_int_mod(out, n, out);
+}
+
+static mp_result
+rsa_private_calculate(mp_int in, mp_int p, mp_int q,
+ mp_int dmp1, mp_int dmq1, mp_int iqmp,
+ mp_int out)
+{
+ mpz_t vp, vq, u;
+ mp_int_init(&vp); mp_int_init(&vq); mp_int_init(&u);
+
+ /* vq = c ^ (d mod (q - 1)) mod q */
+ /* vp = c ^ (d mod (p - 1)) mod p */
+ mp_int_mod(in, p, &u);
+ mp_int_exptmod(&u, dmp1, p, &vp);
+ mp_int_mod(in, q, &u);
+ mp_int_exptmod(&u, dmq1, q, &vq);
+
+ /* C2 = 1/q mod p (iqmp) */
+ /* u = (vp - vq)C2 mod p. */
+ mp_int_sub(&vp, &vq, &u);
+ if (mp_int_compare_zero(&u) < 0)
+ mp_int_add(&u, p, &u);
+ mp_int_mul(&u, iqmp, &u);
+ mp_int_mod(&u, p, &u);
+
+ /* c ^ d mod n = vq + u q */
+ mp_int_mul(&u, q, &u);
+ mp_int_add(&u, &vq, out);
+
+ mp_int_clear(&vp);
+ mp_int_clear(&vq);
+ mp_int_clear(&u);
+
+ return MP_OK;
+}
+
+/*
+ *
+ */
+
+static int
+imath_rsa_public_encrypt(int flen, const unsigned char* from,
+ unsigned char* to, RSA* rsa, int padding)
+{
+ unsigned char *p, *p0;
+ mp_result res;
+ size_t size, padlen;
+ mpz_t enc, dec, n, e;
+
+ if (padding != RSA_PKCS1_PADDING)
+ return -1;
+
+ size = RSA_size(rsa);
+
+ if (size < RSA_PKCS1_PADDING_SIZE || size - RSA_PKCS1_PADDING_SIZE < flen)
+ return -2;
+
+ BN2mpz(&n, rsa->n);
+ BN2mpz(&e, rsa->e);
+
+ p = p0 = malloc(size - 1);
+ if (p0 == NULL) {
+ mp_int_clear(&e);
+ mp_int_clear(&n);
+ return -3;
+ }
+
+ padlen = size - flen - 3;
+ assert(padlen >= 8);
+
+ *p++ = 2;
+ if (RAND_bytes(p, padlen) != 1) {
+ mp_int_clear(&e);
+ mp_int_clear(&n);
+ free(p0);
+ return -4;
+ }
+ while(padlen) {
+ if (*p == 0)
+ *p = 1;
+ padlen--;
+ p++;
+ }
+ *p++ = 0;
+ memcpy(p, from, flen);
+ p += flen;
+ assert((p - p0) == size - 1);
+
+ mp_int_init(&enc);
+ mp_int_init(&dec);
+ mp_int_read_unsigned(&dec, p0, size - 1);
+ free(p0);
+
+ res = mp_int_exptmod(&dec, &e, &n, &enc);
+
+ mp_int_clear(&dec);
+ mp_int_clear(&e);
+ mp_int_clear(&n);
+ {
+ size_t ssize;
+ ssize = mp_int_unsigned_len(&enc);
+ assert(size >= ssize);
+ mp_int_to_unsigned(&enc, to, ssize);
+ size = ssize;
+ }
+ mp_int_clear(&enc);
+
+ return size;
+}
+
+static int
+imath_rsa_public_decrypt(int flen, const unsigned char* from,
+ unsigned char* to, RSA* rsa, int padding)
+{
+ unsigned char *p;
+ mp_result res;
+ size_t size;
+ mpz_t s, us, n, e;
+
+ if (padding != RSA_PKCS1_PADDING)
+ return -1;
+
+ if (flen > RSA_size(rsa))
+ return -2;
+
+ BN2mpz(&n, rsa->n);
+ BN2mpz(&e, rsa->e);
+
+#if 0
+ /* Check that the exponent is larger then 3 */
+ if (mp_int_compare_value(&e, 3) <= 0) {
+ mp_int_clear(&n);
+ mp_int_clear(&e);
+ return -3;
+ }
+#endif
+
+ mp_int_init(&s);
+ mp_int_init(&us);
+ mp_int_read_unsigned(&s, rk_UNCONST(from), flen);
+
+ if (mp_int_compare(&s, &n) >= 0) {
+ mp_int_clear(&n);
+ mp_int_clear(&e);
+ return -4;
+ }
+
+ res = mp_int_exptmod(&s, &e, &n, &us);
+
+ mp_int_clear(&s);
+ mp_int_clear(&n);
+ mp_int_clear(&e);
+
+ if (res != MP_OK)
+ return -5;
+ p = to;
+
+
+ size = mp_int_unsigned_len(&us);
+ assert(size <= RSA_size(rsa));
+ mp_int_to_unsigned(&us, p, size);
+
+ mp_int_clear(&us);
+
+ /* head zero was skipped by mp_int_to_unsigned */
+ if (*p == 0)
+ return -6;
+ if (*p != 1)
+ return -7;
+ size--; p++;
+ while (size && *p == 0xff) {
+ size--; p++;
+ }
+ if (size == 0 || *p != 0)
+ return -8;
+ size--; p++;
+
+ memmove(to, p, size);
+
+ return size;
+}
+
+static int
+imath_rsa_private_encrypt(int flen, const unsigned char* from,
+ unsigned char* to, RSA* rsa, int padding)
+{
+ unsigned char *p, *p0;
+ mp_result res;
+ size_t size;
+ mpz_t in, out, n, e, b, bi;
+ int blinding = (rsa->flags & RSA_FLAG_NO_BLINDING) == 0;
+
+ if (padding != RSA_PKCS1_PADDING)
+ return -1;
+
+ size = RSA_size(rsa);
+
+ if (size < RSA_PKCS1_PADDING_SIZE || size - RSA_PKCS1_PADDING_SIZE < flen)
+ return -2;
+
+ p0 = p = malloc(size);
+ *p++ = 0;
+ *p++ = 1;
+ memset(p, 0xff, size - flen - 3);
+ p += size - flen - 3;
+ *p++ = 0;
+ memcpy(p, from, flen);
+ p += flen;
+ assert((p - p0) == size);
+
+ BN2mpz(&n, rsa->n);
+ BN2mpz(&e, rsa->e);
+
+ mp_int_init(&in);
+ mp_int_init(&out);
+ mp_int_read_unsigned(&in, p0, size);
+ free(p0);
+
+ if(mp_int_compare_zero(&in) < 0 ||
+ mp_int_compare(&in, &n) >= 0) {
+ size = 0;
+ goto out;
+ }
+
+ if (blinding) {
+ setup_blind(&n, &b, &bi);
+ blind(&in, &b, &e, &n);
+ }
+
+ if (rsa->p && rsa->q && rsa->dmp1 && rsa->dmq1 && rsa->iqmp) {
+ mpz_t p, q, dmp1, dmq1, iqmp;
+
+ BN2mpz(&p, rsa->p);
+ BN2mpz(&q, rsa->q);
+ BN2mpz(&dmp1, rsa->dmp1);
+ BN2mpz(&dmq1, rsa->dmq1);
+ BN2mpz(&iqmp, rsa->iqmp);
+
+ res = rsa_private_calculate(&in, &p, &q, &dmp1, &dmq1, &iqmp, &out);
+
+ mp_int_clear(&p);
+ mp_int_clear(&q);
+ mp_int_clear(&dmp1);
+ mp_int_clear(&dmq1);
+ mp_int_clear(&iqmp);
+ } else {
+ mpz_t d;
+
+ BN2mpz(&d, rsa->d);
+ res = mp_int_exptmod(&in, &d, &n, &out);
+ mp_int_clear(&d);
+ if (res != MP_OK) {
+ size = 0;
+ goto out;
+ }
+ }
+
+ if (blinding) {
+ unblind(&out, &bi, &n);
+ mp_int_clear(&b);
+ mp_int_clear(&bi);
+ }
+
+ {
+ size_t ssize;
+ ssize = mp_int_unsigned_len(&out);
+ assert(size >= ssize);
+ mp_int_to_unsigned(&out, to, size);
+ size = ssize;
+ }
+
+out:
+ mp_int_clear(&e);
+ mp_int_clear(&n);
+ mp_int_clear(&in);
+ mp_int_clear(&out);
+
+ return size;
+}
+
+static int
+imath_rsa_private_decrypt(int flen, const unsigned char* from,
+ unsigned char* to, RSA* rsa, int padding)
+{
+ unsigned char *ptr;
+ mp_result res;
+ size_t size;
+ mpz_t in, out, n, e, b, bi;
+ int blinding = (rsa->flags & RSA_FLAG_NO_BLINDING) == 0;
+
+ if (padding != RSA_PKCS1_PADDING)
+ return -1;
+
+ size = RSA_size(rsa);
+ if (flen > size)
+ return -2;
+
+ mp_int_init(&in);
+ mp_int_init(&out);
+
+ BN2mpz(&n, rsa->n);
+ BN2mpz(&e, rsa->e);
+
+ res = mp_int_read_unsigned(&in, rk_UNCONST(from), flen);
+ if (res != MP_OK) {
+ size = -1;
+ goto out;
+ }
+
+ if(mp_int_compare_zero(&in) < 0 ||
+ mp_int_compare(&in, &n) >= 0) {
+ size = 0;
+ goto out;
+ }
+
+ if (blinding) {
+ setup_blind(&n, &b, &bi);
+ blind(&in, &b, &e, &n);
+ }
+
+ if (rsa->p && rsa->q && rsa->dmp1 && rsa->dmq1 && rsa->iqmp) {
+ mpz_t p, q, dmp1, dmq1, iqmp;
+
+ BN2mpz(&p, rsa->p);
+ BN2mpz(&q, rsa->q);
+ BN2mpz(&dmp1, rsa->dmp1);
+ BN2mpz(&dmq1, rsa->dmq1);
+ BN2mpz(&iqmp, rsa->iqmp);
+
+ res = rsa_private_calculate(&in, &p, &q, &dmp1, &dmq1, &iqmp, &out);
+
+ mp_int_clear(&p);
+ mp_int_clear(&q);
+ mp_int_clear(&dmp1);
+ mp_int_clear(&dmq1);
+ mp_int_clear(&iqmp);
+ } else {
+ mpz_t d;
+
+ if(mp_int_compare_zero(&in) < 0 ||
+ mp_int_compare(&in, &n) >= 0)
+ return MP_RANGE;
+
+ BN2mpz(&d, rsa->d);
+ res = mp_int_exptmod(&in, &d, &n, &out);
+ mp_int_clear(&d);
+ if (res != MP_OK) {
+ size = 0;
+ goto out;
+ }
+ }
+
+ if (blinding) {
+ unblind(&out, &bi, &n);
+ mp_int_clear(&b);
+ mp_int_clear(&bi);
+ }
+
+ ptr = to;
+ {
+ size_t ssize;
+ ssize = mp_int_unsigned_len(&out);
+ assert(size >= ssize);
+ mp_int_to_unsigned(&out, ptr, ssize);
+ size = ssize;
+ }
+
+ /* head zero was skipped by mp_int_to_unsigned */
+ if (*ptr != 2)
+ return -3;
+ size--; ptr++;
+ while (size && *ptr != 0) {
+ size--; ptr++;
+ }
+ if (size == 0)
+ return -4;
+ size--; ptr++;
+
+ memmove(to, ptr, size);
+
+out:
+ mp_int_clear(&e);
+ mp_int_clear(&n);
+ mp_int_clear(&in);
+ mp_int_clear(&out);
+
+ return size;
+}
+
+static int
+random_num(mp_int num, size_t len)
+{
+ unsigned char *p;
+ mp_result res;
+
+ len = (len + 7) / 8;
+ p = malloc(len);
+ if (p == NULL)
+ return 1;
+ if (RAND_bytes(p, len) != 1) {
+ free(p);
+ return 1;
+ }
+ res = mp_int_read_unsigned(num, p, len);
+ free(p);
+ if (res != MP_OK)
+ return 1;
+ return 0;
+}
+
+#define CHECK(f, v) if ((f) != (v)) { goto out; }
+
+static int
+imath_rsa_generate_key(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb)
+{
+ mpz_t el, p, q, n, d, dmp1, dmq1, iqmp, t1, t2, t3;
+ int counter, ret;
+
+ if (bits < 789)
+ return -1;
+
+ ret = -1;
+
+ mp_int_init(&el);
+ mp_int_init(&p);
+ mp_int_init(&q);
+ mp_int_init(&n);
+ mp_int_init(&d);
+ mp_int_init(&dmp1);
+ mp_int_init(&dmq1);
+ mp_int_init(&iqmp);
+ mp_int_init(&t1);
+ mp_int_init(&t2);
+ mp_int_init(&t3);
+
+ BN2mpz(&el, e);
+
+ /* generate p and q so that p != q and bits(pq) ~ bits */
+ counter = 0;
+ do {
+ BN_GENCB_call(cb, 2, counter++);
+ CHECK(random_num(&p, bits / 2 + 1), 0);
+ CHECK(mp_int_find_prime(&p), MP_TRUE);
+
+ CHECK(mp_int_sub_value(&p, 1, &t1), MP_OK);
+ CHECK(mp_int_gcd(&t1, &el, &t2), MP_OK);
+ } while(mp_int_compare_value(&t2, 1) != 0);
+
+ BN_GENCB_call(cb, 3, 0);
+
+ counter = 0;
+ do {
+ BN_GENCB_call(cb, 2, counter++);
+ CHECK(random_num(&q, bits / 2 + 1), 0);
+ CHECK(mp_int_find_prime(&q), MP_TRUE);
+
+ if (mp_int_compare(&p, &q) == 0) /* don't let p and q be the same */
+ continue;
+
+ CHECK(mp_int_sub_value(&q, 1, &t1), MP_OK);
+ CHECK(mp_int_gcd(&t1, &el, &t2), MP_OK);
+ } while(mp_int_compare_value(&t2, 1) != 0);
+
+ /* make p > q */
+ if (mp_int_compare(&p, &q) < 0)
+ mp_int_swap(&p, &q);
+
+ BN_GENCB_call(cb, 3, 1);
+
+ /* calculate n, n = p * q */
+ CHECK(mp_int_mul(&p, &q, &n), MP_OK);
+
+ /* calculate d, d = 1/e mod (p - 1)(q - 1) */
+ CHECK(mp_int_sub_value(&p, 1, &t1), MP_OK);
+ CHECK(mp_int_sub_value(&q, 1, &t2), MP_OK);
+ CHECK(mp_int_mul(&t1, &t2, &t3), MP_OK);
+ CHECK(mp_int_invmod(&el, &t3, &d), MP_OK);
+
+ /* calculate dmp1 dmp1 = d mod (p-1) */
+ CHECK(mp_int_mod(&d, &t1, &dmp1), MP_OK);
+ /* calculate dmq1 dmq1 = d mod (q-1) */
+ CHECK(mp_int_mod(&d, &t2, &dmq1), MP_OK);
+ /* calculate iqmp iqmp = 1/q mod p */
+ CHECK(mp_int_invmod(&q, &p, &iqmp), MP_OK);
+
+ /* fill in RSA key */
+
+ rsa->e = mpz2BN(&el);
+ rsa->p = mpz2BN(&p);
+ rsa->q = mpz2BN(&q);
+ rsa->n = mpz2BN(&n);
+ rsa->d = mpz2BN(&d);
+ rsa->dmp1 = mpz2BN(&dmp1);
+ rsa->dmq1 = mpz2BN(&dmq1);
+ rsa->iqmp = mpz2BN(&iqmp);
+
+ ret = 1;
+out:
+ mp_int_clear(&el);
+ mp_int_clear(&p);
+ mp_int_clear(&q);
+ mp_int_clear(&n);
+ mp_int_clear(&d);
+ mp_int_clear(&dmp1);
+ mp_int_clear(&dmq1);
+ mp_int_clear(&iqmp);
+ mp_int_clear(&t1);
+ mp_int_clear(&t2);
+ mp_int_clear(&t3);
+
+ return ret;
+}
+
+static int
+imath_rsa_init(RSA *rsa)
+{
+ return 1;
+}
+
+static int
+imath_rsa_finish(RSA *rsa)
+{
+ return 1;
+}
+
+const RSA_METHOD hc_rsa_imath_method = {
+ "hcrypto imath RSA",
+ imath_rsa_public_encrypt,
+ imath_rsa_public_decrypt,
+ imath_rsa_private_encrypt,
+ imath_rsa_private_decrypt,
+ NULL,
+ NULL,
+ imath_rsa_init,
+ imath_rsa_finish,
+ 0,
+ NULL,
+ NULL,
+ NULL,
+ imath_rsa_generate_key
+};
+
+const RSA_METHOD *
+RSA_imath_method(void)
+{
+ return &hc_rsa_imath_method;
+}
generated by cgit (git 2.34.1) at 2024-07-10 20:22:55 +0000