1 /* crypto/rsa/rsa_chk.c -*- Mode: C; c-file-style: "eay" -*- */
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>
56 int RSA_check_key(const RSA *key)
58 BIGNUM *i, *j, *k, *l, *m;
63 if (!key->p || !key->q || !key->n || !key->e || !key->d)
65 RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_VALUE_MISSING);
75 if (i == NULL || j == NULL || k == NULL || l == NULL ||
76 m == NULL || ctx == NULL)
79 RSAerr(RSA_F_RSA_CHECK_KEY, ERR_R_MALLOC_FAILURE);
84 r = BN_is_prime_ex(key->p, BN_prime_checks, NULL, NULL);
90 RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_P_NOT_PRIME);
94 r = BN_is_prime_ex(key->q, BN_prime_checks, NULL, NULL);
100 RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_Q_NOT_PRIME);
104 r = BN_mul(i, key->p, key->q, ctx);
105 if (!r) { ret = -1; goto err; }
107 if (BN_cmp(i, key->n) != 0)
110 RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_N_DOES_NOT_EQUAL_P_Q);
113 /* d*e = 1 mod lcm(p-1,q-1)? */
115 r = BN_sub(i, key->p, BN_value_one());
116 if (!r) { ret = -1; goto err; }
117 r = BN_sub(j, key->q, BN_value_one());
118 if (!r) { ret = -1; goto err; }
120 /* now compute k = lcm(i,j) */
121 r = BN_mul(l, i, j, ctx);
122 if (!r) { ret = -1; goto err; }
123 r = BN_gcd(m, i, j, ctx);
124 if (!r) { ret = -1; goto err; }
125 r = BN_div(k, NULL, l, m, ctx); /* remainder is 0 */
126 if (!r) { ret = -1; goto err; }
128 r = BN_mod_mul(i, key->d, key->e, k, ctx);
129 if (!r) { ret = -1; goto err; }
134 RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_D_E_NOT_CONGRUENT_TO_1);
137 if (key->dmp1 != NULL && key->dmq1 != NULL && key->iqmp != NULL)
139 /* dmp1 = d mod (p-1)? */
140 r = BN_sub(i, key->p, BN_value_one());
141 if (!r) { ret = -1; goto err; }
143 r = BN_mod(j, key->d, i, ctx);
144 if (!r) { ret = -1; goto err; }
146 if (BN_cmp(j, key->dmp1) != 0)
149 RSAerr(RSA_F_RSA_CHECK_KEY,
150 RSA_R_DMP1_NOT_CONGRUENT_TO_D);
153 /* dmq1 = d mod (q-1)? */
154 r = BN_sub(i, key->q, BN_value_one());
155 if (!r) { ret = -1; goto err; }
157 r = BN_mod(j, key->d, i, ctx);
158 if (!r) { ret = -1; goto err; }
160 if (BN_cmp(j, key->dmq1) != 0)
163 RSAerr(RSA_F_RSA_CHECK_KEY,
164 RSA_R_DMQ1_NOT_CONGRUENT_TO_D);
167 /* iqmp = q^-1 mod p? */
168 if(!BN_mod_inverse(i, key->q, key->p, ctx))
174 if (BN_cmp(i, key->iqmp) != 0)
177 RSAerr(RSA_F_RSA_CHECK_KEY,
178 RSA_R_IQMP_NOT_INVERSE_OF_Q);
183 if (i != NULL) BN_free(i);
184 if (j != NULL) BN_free(j);
185 if (k != NULL) BN_free(k);
186 if (l != NULL) BN_free(l);
187 if (m != NULL) BN_free(m);
188 if (ctx != NULL) BN_CTX_free(ctx);