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-rw-r--r--source4/heimdal/lib/hcrypto/rsa-ltm.c630
1 files changed, 630 insertions, 0 deletions
diff --git a/source4/heimdal/lib/hcrypto/rsa-ltm.c b/source4/heimdal/lib/hcrypto/rsa-ltm.c
new file mode 100644
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+++ b/source4/heimdal/lib/hcrypto/rsa-ltm.c
@@ -0,0 +1,630 @@
+/*
+ * Copyright (c) 2006 - 2007, 2010 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.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <krb5-types.h>
+#include <assert.h>
+
+#include <rsa.h>
+
+#include <roken.h>
+
+#include "tommath.h"
+
+static int
+random_num(mp_int *num, size_t len)
+{
+ unsigned char *p;
+
+ len = (len + 7) / 8;
+ p = malloc(len);
+ if (p == NULL)
+ return 1;
+ if (RAND_bytes(p, len) != 1) {
+ free(p);
+ return 1;
+ }
+ mp_read_unsigned_bin(num, p, len);
+ free(p);
+ return 0;
+}
+
+static void
+BN2mpz(mp_int *s, const BIGNUM *bn)
+{
+ size_t len;
+ void *p;
+
+ len = BN_num_bytes(bn);
+ p = malloc(len);
+ BN_bn2bin(bn, p);
+ mp_read_unsigned_bin(s, p, len);
+ free(p);
+}
+
+static void
+setup_blind(mp_int *n, mp_int *b, mp_int *bi)
+{
+ random_num(b, mp_count_bits(n));
+ mp_mod(b, n, b);
+ mp_invmod(b, n, bi);
+}
+
+static void
+blind(mp_int *in, mp_int *b, mp_int *e, mp_int *n)
+{
+ mp_int t1;
+ mp_init(&t1);
+ /* in' = (in * b^e) mod n */
+ mp_exptmod(b, e, n, &t1);
+ mp_mul(&t1, in, in);
+ mp_mod(in, n, in);
+ mp_clear(&t1);
+}
+
+static void
+unblind(mp_int *out, mp_int *bi, mp_int *n)
+{
+ /* out' = (out * 1/b) mod n */
+ mp_mul(out, bi, out);
+ mp_mod(out, n, out);
+}
+
+static int
+ltm_rsa_private_calculate(mp_int * in, mp_int * p, mp_int * q,
+ mp_int * dmp1, mp_int * dmq1, mp_int * iqmp,
+ mp_int * out)
+{
+ mp_int vp, vq, u;
+
+ mp_init_multi(&vp, &vq, &u, NULL);
+
+ /* vq = c ^ (d mod (q - 1)) mod q */
+ /* vp = c ^ (d mod (p - 1)) mod p */
+ mp_mod(in, p, &u);
+ mp_exptmod(&u, dmp1, p, &vp);
+ mp_mod(in, q, &u);
+ mp_exptmod(&u, dmq1, q, &vq);
+
+ /* C2 = 1/q mod p (iqmp) */
+ /* u = (vp - vq)C2 mod p. */
+ mp_sub(&vp, &vq, &u);
+ if (mp_isneg(&u))
+ mp_add(&u, p, &u);
+ mp_mul(&u, iqmp, &u);
+ mp_mod(&u, p, &u);
+
+ /* c ^ d mod n = vq + u q */
+ mp_mul(&u, q, &u);
+ mp_add(&u, &vq, out);
+
+ mp_clear_multi(&vp, &vq, &u, NULL);
+
+ return 0;
+}
+
+/*
+ *
+ */
+
+static int
+ltm_rsa_public_encrypt(int flen, const unsigned char* from,
+ unsigned char* to, RSA* rsa, int padding)
+{
+ unsigned char *p, *p0;
+ int res;
+ size_t size, padlen;
+ mp_int enc, dec, n, e;
+
+ if (padding != RSA_PKCS1_PADDING)
+ return -1;
+
+ mp_init_multi(&n, &e, &enc, &dec, NULL);
+
+ size = RSA_size(rsa);
+
+ if (size < RSA_PKCS1_PADDING_SIZE || size - RSA_PKCS1_PADDING_SIZE < flen) {
+ mp_clear_multi(&n, &e, &enc, &dec);
+ return -2;
+ }
+
+ BN2mpz(&n, rsa->n);
+ BN2mpz(&e, rsa->e);
+
+ p = p0 = malloc(size - 1);
+ if (p0 == NULL) {
+ mp_clear_multi(&e, &n, &enc, &dec, NULL);
+ return -3;
+ }
+
+ padlen = size - flen - 3;
+
+ *p++ = 2;
+ if (RAND_bytes(p, padlen) != 1) {
+ mp_clear_multi(&e, &n, &enc, &dec, NULL);
+ 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_read_unsigned_bin(&dec, p0, size - 1);
+ free(p0);
+
+ res = mp_exptmod(&dec, &e, &n, &enc);
+
+ mp_clear_multi(&dec, &e, &n, NULL);
+
+ if (res != 0) {
+ mp_clear(&enc);
+ return -4;
+ }
+
+ {
+ size_t ssize;
+ ssize = mp_unsigned_bin_size(&enc);
+ assert(size >= ssize);
+ mp_to_unsigned_bin(&enc, to);
+ size = ssize;
+ }
+ mp_clear(&enc);
+
+ return size;
+}
+
+static int
+ltm_rsa_public_decrypt(int flen, const unsigned char* from,
+ unsigned char* to, RSA* rsa, int padding)
+{
+ unsigned char *p;
+ int res;
+ size_t size;
+ mp_int s, us, n, e;
+
+ if (padding != RSA_PKCS1_PADDING)
+ return -1;
+
+ if (flen > RSA_size(rsa))
+ return -2;
+
+ mp_init_multi(&e, &n, &s, &us, NULL);
+
+ 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_clear_multi(&e, &n, &s, &us, NULL);
+ return -3;
+ }
+#endif
+
+ mp_read_unsigned_bin(&s, rk_UNCONST(from), flen);
+
+ if (mp_cmp(&s, &n) >= 0) {
+ mp_clear_multi(&e, &n, &s, &us, NULL);
+ return -4;
+ }
+
+ res = mp_exptmod(&s, &e, &n, &us);
+
+ mp_clear_multi(&e, &n, &s, NULL);
+
+ if (res != 0) {
+ mp_clear(&us);
+ return -5;
+ }
+ p = to;
+
+
+ size = mp_unsigned_bin_size(&us);
+ assert(size <= RSA_size(rsa));
+ mp_to_unsigned_bin(&us, p);
+
+ mp_clear(&us);
+
+ /* head zero was skipped by mp_to_unsigned_bin */
+ 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
+ltm_rsa_private_encrypt(int flen, const unsigned char* from,
+ unsigned char* to, RSA* rsa, int padding)
+{
+ unsigned char *p, *p0;
+ int res;
+ int size;
+ mp_int in, out, n, e;
+ mp_int bi, b;
+ int blinding = (rsa->flags & RSA_FLAG_NO_BLINDING) == 0;
+ int do_unblind = 0;
+
+ if (padding != RSA_PKCS1_PADDING)
+ return -1;
+
+ mp_init_multi(&e, &n, &in, &out, &b, &bi, NULL);
+
+ 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_read_unsigned_bin(&in, p0, size);
+ free(p0);
+
+ if(mp_isneg(&in) || mp_cmp(&in, &n) >= 0) {
+ size = -3;
+ goto out;
+ }
+
+ if (blinding) {
+ setup_blind(&n, &b, &bi);
+ blind(&in, &b, &e, &n);
+ do_unblind = 1;
+ }
+
+ if (rsa->p && rsa->q && rsa->dmp1 && rsa->dmq1 && rsa->iqmp) {
+ mp_int p, q, dmp1, dmq1, iqmp;
+
+ mp_init_multi(&p, &q, &dmp1, &dmq1, &iqmp, NULL);
+
+ BN2mpz(&p, rsa->p);
+ BN2mpz(&q, rsa->q);
+ BN2mpz(&dmp1, rsa->dmp1);
+ BN2mpz(&dmq1, rsa->dmq1);
+ BN2mpz(&iqmp, rsa->iqmp);
+
+ res = ltm_rsa_private_calculate(&in, &p, &q, &dmp1, &dmq1, &iqmp, &out);
+
+ mp_clear_multi(&p, &q, &dmp1, &dmq1, &iqmp, NULL);
+
+ if (res != 0) {
+ size = -4;
+ goto out;
+ }
+ } else {
+ mp_int d;
+
+ BN2mpz(&d, rsa->d);
+ res = mp_exptmod(&in, &d, &n, &out);
+ mp_clear(&d);
+ if (res != 0) {
+ size = -5;
+ goto out;
+ }
+ }
+
+ if (do_unblind)
+ unblind(&out, &bi, &n);
+
+ if (size > 0) {
+ size_t ssize;
+ ssize = mp_unsigned_bin_size(&out);
+ assert(size >= ssize);
+ mp_to_unsigned_bin(&out, to);
+ size = ssize;
+ }
+
+ out:
+ mp_clear_multi(&e, &n, &in, &out, &b, &bi, NULL);
+
+ return size;
+}
+
+static int
+ltm_rsa_private_decrypt(int flen, const unsigned char* from,
+ unsigned char* to, RSA* rsa, int padding)
+{
+ unsigned char *ptr;
+ int res;
+ size_t size;
+ mp_int in, out, n, e, b, bi;
+ int blinding = (rsa->flags & RSA_FLAG_NO_BLINDING) == 0;
+ int do_unblind = 0;
+
+ if (padding != RSA_PKCS1_PADDING)
+ return -1;
+
+ size = RSA_size(rsa);
+ if (flen > size)
+ return -2;
+
+ mp_init_multi(&in, &n, &e, &out, &bi, &b, NULL);
+
+ BN2mpz(&n, rsa->n);
+ BN2mpz(&e, rsa->e);
+
+ mp_read_unsigned_bin(&in, rk_UNCONST(from), flen);
+
+ if(mp_isneg(&in) || mp_cmp(&in, &n) >= 0) {
+ size = -2;
+ goto out;
+ }
+
+ if (blinding) {
+ setup_blind(&n, &b, &bi);
+ blind(&in, &b, &e, &n);
+ do_unblind = 1;
+ }
+
+ if (rsa->p && rsa->q && rsa->dmp1 && rsa->dmq1 && rsa->iqmp) {
+ mp_int p, q, dmp1, dmq1, iqmp;
+
+ mp_init_multi(&p, &q, &dmp1, &dmq1, &iqmp, NULL);
+
+ BN2mpz(&p, rsa->p);
+ BN2mpz(&q, rsa->q);
+ BN2mpz(&dmp1, rsa->dmp1);
+ BN2mpz(&dmq1, rsa->dmq1);
+ BN2mpz(&iqmp, rsa->iqmp);
+
+ res = ltm_rsa_private_calculate(&in, &p, &q, &dmp1, &dmq1, &iqmp, &out);
+
+ mp_clear_multi(&p, &q, &dmp1, &dmq1, &iqmp, NULL);
+
+ if (res != 0) {
+ size = -3;
+ goto out;
+ }
+
+ } else {
+ mp_int d;
+
+ if(mp_isneg(&in) || mp_cmp(&in, &n) >= 0)
+ return -4;
+
+ BN2mpz(&d, rsa->d);
+ res = mp_exptmod(&in, &d, &n, &out);
+ mp_clear(&d);
+ if (res != 0) {
+ size = -5;
+ goto out;
+ }
+ }
+
+ if (do_unblind)
+ unblind(&out, &bi, &n);
+
+ ptr = to;
+ {
+ size_t ssize;
+ ssize = mp_unsigned_bin_size(&out);
+ assert(size >= ssize);
+ mp_to_unsigned_bin(&out, ptr);
+ size = ssize;
+ }
+
+ /* head zero was skipped by mp_int_to_unsigned */
+ if (*ptr != 2) {
+ size = -6;
+ goto out;
+ }
+ size--; ptr++;
+ while (size && *ptr != 0) {
+ size--; ptr++;
+ }
+ if (size == 0)
+ return -7;
+ size--; ptr++;
+
+ memmove(to, ptr, size);
+
+ out:
+ mp_clear_multi(&e, &n, &in, &out, NULL);
+
+ return size;
+}
+
+static BIGNUM *
+mpz2BN(mp_int *s)
+{
+ size_t size;
+ BIGNUM *bn;
+ void *p;
+
+ size = mp_unsigned_bin_size(s);
+ p = malloc(size);
+ if (p == NULL && size != 0)
+ return NULL;
+
+ mp_to_unsigned_bin(s, p);
+
+ bn = BN_bin2bn(p, size, NULL);
+ free(p);
+ return bn;
+}
+
+#define CHECK(f, v) if ((f) != (v)) { goto out; }
+
+static int
+ltm_rsa_generate_key(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb)
+{
+ mp_int el, p, q, n, d, dmp1, dmq1, iqmp, t1, t2, t3;
+ int counter, ret, bitsp;
+
+ if (bits < 789)
+ return -1;
+
+ bitsp = (bits + 1) / 2;
+
+ ret = -1;
+
+ mp_init_multi(&el, &p, &q, &n, &n, &d, &dmp1, &dmq1, &iqmp, &t1, &t2, &t3, NULL);
+
+ 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, bitsp), 0);
+ CHECK(mp_find_prime(&p), MP_YES);
+
+ mp_sub_d(&p, 1, &t1);
+ mp_gcd(&t1, &el, &t2);
+ } while(mp_cmp_d(&t2, 1) != 0);
+
+ BN_GENCB_call(cb, 3, 0);
+
+ counter = 0;
+ do {
+ BN_GENCB_call(cb, 2, counter++);
+ CHECK(random_num(&q, bits - bitsp), 0);
+ CHECK(mp_find_prime(&q), MP_YES);
+
+ if (mp_cmp(&p, &q) == 0) /* don't let p and q be the same */
+ continue;
+
+ mp_sub_d(&q, 1, &t1);
+ mp_gcd(&t1, &el, &t2);
+ } while(mp_cmp_d(&t2, 1) != 0);
+
+ /* make p > q */
+ if (mp_cmp(&p, &q) < 0) {
+ mp_int c;
+ c = p;
+ p = q;
+ q = c;
+ }
+
+ BN_GENCB_call(cb, 3, 1);
+
+ /* calculate n, n = p * q */
+ mp_mul(&p, &q, &n);
+
+ /* calculate d, d = 1/e mod (p - 1)(q - 1) */
+ mp_sub_d(&p, 1, &t1);
+ mp_sub_d(&q, 1, &t2);
+ mp_mul(&t1, &t2, &t3);
+ mp_invmod(&el, &t3, &d);
+
+ /* calculate dmp1 dmp1 = d mod (p-1) */
+ mp_mod(&d, &t1, &dmp1);
+ /* calculate dmq1 dmq1 = d mod (q-1) */
+ mp_mod(&d, &t2, &dmq1);
+ /* calculate iqmp iqmp = 1/q mod p */
+ mp_invmod(&q, &p, &iqmp);
+
+ /* 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_clear_multi(&el, &p, &q, &n, &d, &dmp1,
+ &dmq1, &iqmp, &t1, &t2, &t3, NULL);
+
+ return ret;
+}
+
+static int
+ltm_rsa_init(RSA *rsa)
+{
+ return 1;
+}
+
+static int
+ltm_rsa_finish(RSA *rsa)
+{
+ return 1;
+}
+
+const RSA_METHOD hc_rsa_ltm_method = {
+ "hcrypto ltm RSA",
+ ltm_rsa_public_encrypt,
+ ltm_rsa_public_decrypt,
+ ltm_rsa_private_encrypt,
+ ltm_rsa_private_decrypt,
+ NULL,
+ NULL,
+ ltm_rsa_init,
+ ltm_rsa_finish,
+ 0,
+ NULL,
+ NULL,
+ NULL,
+ ltm_rsa_generate_key
+};
+
+const RSA_METHOD *
+RSA_ltm_method(void)
+{
+ return &hc_rsa_ltm_method;
+}
generated by cgit (git 2.34.1) at 2024-06-13 07:52:14 +0000