1 /* $OpenBSD: rsa_chk.c,v 1.16 2022/01/20 11:08:12 inoguchi Exp $ */
2 /* ====================================================================
3 * Copyright (c) 1999 The OpenSSL Project. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
17 * 3. All advertising materials mentioning features or use of this
18 * software must display the following acknowledgment:
19 * "This product includes software developed by the OpenSSL Project
20 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23 * endorse or promote products derived from this software without
24 * prior written permission. For written permission, please contact
25 * openssl-core@OpenSSL.org.
27 * 5. Products derived from this software may not be called "OpenSSL"
28 * nor may "OpenSSL" appear in their names without prior written
29 * permission of the OpenSSL Project.
31 * 6. Redistributions of any form whatsoever must retain the following
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
51 #include <openssl/bn.h>
52 #include <openssl/err.h>
53 #include <openssl/rsa.h>
59 RSA_check_key(const RSA *key)
61 BIGNUM *i, *j, *k, *l, *m;
66 if (!key->p || !key->q || !key->n || !key->e || !key->d) {
67 RSAerror(RSA_R_VALUE_MISSING);
77 if (i == NULL || j == NULL || k == NULL || l == NULL || m == NULL ||
80 RSAerror(ERR_R_MALLOC_FAILURE);
84 if (BN_is_one(key->e)) {
86 RSAerror(RSA_R_BAD_E_VALUE);
88 if (!BN_is_odd(key->e)) {
90 RSAerror(RSA_R_BAD_E_VALUE);
94 r = BN_is_prime_ex(key->p, BN_prime_checks, NULL, NULL);
99 RSAerror(RSA_R_P_NOT_PRIME);
103 r = BN_is_prime_ex(key->q, BN_prime_checks, NULL, NULL);
108 RSAerror(RSA_R_Q_NOT_PRIME);
112 r = BN_mul(i, key->p, key->q, ctx);
118 if (BN_cmp(i, key->n) != 0) {
120 RSAerror(RSA_R_N_DOES_NOT_EQUAL_P_Q);
123 /* d*e = 1 mod lcm(p-1,q-1)? */
125 r = BN_sub(i, key->p, BN_value_one());
130 r = BN_sub(j, key->q, BN_value_one());
136 /* now compute k = lcm(i,j) */
137 r = BN_mul(l, i, j, ctx);
142 r = BN_gcd_ct(m, i, j, ctx);
147 r = BN_div_ct(k, NULL, l, m, ctx); /* remainder is 0 */
153 r = BN_mod_mul(i, key->d, key->e, k, ctx);
161 RSAerror(RSA_R_D_E_NOT_CONGRUENT_TO_1);
164 if (key->dmp1 != NULL && key->dmq1 != NULL && key->iqmp != NULL) {
165 /* dmp1 = d mod (p-1)? */
166 r = BN_sub(i, key->p, BN_value_one());
172 r = BN_mod_ct(j, key->d, i, ctx);
178 if (BN_cmp(j, key->dmp1) != 0) {
180 RSAerror(RSA_R_DMP1_NOT_CONGRUENT_TO_D);
183 /* dmq1 = d mod (q-1)? */
184 r = BN_sub(i, key->q, BN_value_one());
190 r = BN_mod_ct(j, key->d, i, ctx);
196 if (BN_cmp(j, key->dmq1) != 0) {
198 RSAerror(RSA_R_DMQ1_NOT_CONGRUENT_TO_D);
201 /* iqmp = q^-1 mod p? */
202 if (BN_mod_inverse_ct(i, key->q, key->p, ctx) == NULL) {
207 if (BN_cmp(i, key->iqmp) != 0) {
209 RSAerror(RSA_R_IQMP_NOT_INVERSE_OF_Q);