156083Skris/* crypto/rsa/rsa_chk.c -*- Mode: C; c-file-style: "eay" -*- */ 256083Skris/* ==================================================================== 356083Skris * Copyright (c) 1999 The OpenSSL Project. All rights reserved. 456083Skris * 556083Skris * Redistribution and use in source and binary forms, with or without 656083Skris * modification, are permitted provided that the following conditions 756083Skris * are met: 856083Skris * 956083Skris * 1. Redistributions of source code must retain the above copyright 10296341Sdelphij * notice, this list of conditions and the following disclaimer. 1156083Skris * 1256083Skris * 2. Redistributions in binary form must reproduce the above copyright 1356083Skris * notice, this list of conditions and the following disclaimer in 1456083Skris * the documentation and/or other materials provided with the 1556083Skris * distribution. 1656083Skris * 1756083Skris * 3. All advertising materials mentioning features or use of this 1856083Skris * software must display the following acknowledgment: 1956083Skris * "This product includes software developed by the OpenSSL Project 2056083Skris * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 2156083Skris * 2256083Skris * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 2356083Skris * endorse or promote products derived from this software without 2456083Skris * prior written permission. For written permission, please contact 2556083Skris * openssl-core@OpenSSL.org. 2656083Skris * 2756083Skris * 5. Products derived from this software may not be called "OpenSSL" 2856083Skris * nor may "OpenSSL" appear in their names without prior written 2956083Skris * permission of the OpenSSL Project. 3056083Skris * 3156083Skris * 6. Redistributions of any form whatsoever must retain the following 3256083Skris * acknowledgment: 3356083Skris * "This product includes software developed by the OpenSSL Project 3456083Skris * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 3556083Skris * 3656083Skris * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 3756083Skris * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 3856083Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 3956083Skris * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 4056083Skris * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 4156083Skris * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 4256083Skris * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 4356083Skris * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4456083Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 4556083Skris * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 4656083Skris * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 4756083Skris * OF THE POSSIBILITY OF SUCH DAMAGE. 4856083Skris * ==================================================================== 4956083Skris */ 5056083Skris 5156083Skris#include <openssl/bn.h> 5256083Skris#include <openssl/err.h> 5356083Skris#include <openssl/rsa.h> 5456083Skris 55109998Smarkmint RSA_check_key(const RSA *key) 56296341Sdelphij{ 57296341Sdelphij BIGNUM *i, *j, *k, *l, *m; 58296341Sdelphij BN_CTX *ctx; 59296341Sdelphij int r; 60296341Sdelphij int ret = 1; 61264331Sjkim 62296341Sdelphij if (!key->p || !key->q || !key->n || !key->e || !key->d) { 63296341Sdelphij RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_VALUE_MISSING); 64296341Sdelphij return 0; 65296341Sdelphij } 6656083Skris 67296341Sdelphij i = BN_new(); 68296341Sdelphij j = BN_new(); 69296341Sdelphij k = BN_new(); 70296341Sdelphij l = BN_new(); 71296341Sdelphij m = BN_new(); 72296341Sdelphij ctx = BN_CTX_new(); 73296341Sdelphij if (i == NULL || j == NULL || k == NULL || l == NULL || 74296341Sdelphij m == NULL || ctx == NULL) { 75296341Sdelphij ret = -1; 76296341Sdelphij RSAerr(RSA_F_RSA_CHECK_KEY, ERR_R_MALLOC_FAILURE); 77296341Sdelphij goto err; 78296341Sdelphij } 7956083Skris 80296341Sdelphij /* p prime? */ 81296341Sdelphij r = BN_is_prime_ex(key->p, BN_prime_checks, NULL, NULL); 82296341Sdelphij if (r != 1) { 83296341Sdelphij ret = r; 84296341Sdelphij if (r != 0) 85296341Sdelphij goto err; 86296341Sdelphij RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_P_NOT_PRIME); 87296341Sdelphij } 8856083Skris 89296341Sdelphij /* q prime? */ 90296341Sdelphij r = BN_is_prime_ex(key->q, BN_prime_checks, NULL, NULL); 91296341Sdelphij if (r != 1) { 92296341Sdelphij ret = r; 93296341Sdelphij if (r != 0) 94296341Sdelphij goto err; 95296341Sdelphij RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_Q_NOT_PRIME); 96296341Sdelphij } 9756083Skris 98296341Sdelphij /* n = p*q? */ 99296341Sdelphij r = BN_mul(i, key->p, key->q, ctx); 100296341Sdelphij if (!r) { 101296341Sdelphij ret = -1; 102296341Sdelphij goto err; 103296341Sdelphij } 10456083Skris 105296341Sdelphij if (BN_cmp(i, key->n) != 0) { 106296341Sdelphij ret = 0; 107296341Sdelphij RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_N_DOES_NOT_EQUAL_P_Q); 108296341Sdelphij } 10956083Skris 110296341Sdelphij /* d*e = 1 mod lcm(p-1,q-1)? */ 11156083Skris 112296341Sdelphij r = BN_sub(i, key->p, BN_value_one()); 113296341Sdelphij if (!r) { 114296341Sdelphij ret = -1; 115296341Sdelphij goto err; 116296341Sdelphij } 117296341Sdelphij r = BN_sub(j, key->q, BN_value_one()); 118296341Sdelphij if (!r) { 119296341Sdelphij ret = -1; 120296341Sdelphij goto err; 121296341Sdelphij } 12256083Skris 123296341Sdelphij /* now compute k = lcm(i,j) */ 124296341Sdelphij r = BN_mul(l, i, j, ctx); 125296341Sdelphij if (!r) { 126296341Sdelphij ret = -1; 127296341Sdelphij goto err; 128296341Sdelphij } 129296341Sdelphij r = BN_gcd(m, i, j, ctx); 130296341Sdelphij if (!r) { 131296341Sdelphij ret = -1; 132296341Sdelphij goto err; 133296341Sdelphij } 134296341Sdelphij r = BN_div(k, NULL, l, m, ctx); /* remainder is 0 */ 135296341Sdelphij if (!r) { 136296341Sdelphij ret = -1; 137296341Sdelphij goto err; 138296341Sdelphij } 13956083Skris 140296341Sdelphij r = BN_mod_mul(i, key->d, key->e, k, ctx); 141296341Sdelphij if (!r) { 142296341Sdelphij ret = -1; 143296341Sdelphij goto err; 144296341Sdelphij } 145296341Sdelphij 146296341Sdelphij if (!BN_is_one(i)) { 147296341Sdelphij ret = 0; 148296341Sdelphij RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_D_E_NOT_CONGRUENT_TO_1); 149296341Sdelphij } 150296341Sdelphij 151296341Sdelphij if (key->dmp1 != NULL && key->dmq1 != NULL && key->iqmp != NULL) { 152296341Sdelphij /* dmp1 = d mod (p-1)? */ 153296341Sdelphij r = BN_sub(i, key->p, BN_value_one()); 154296341Sdelphij if (!r) { 155296341Sdelphij ret = -1; 156296341Sdelphij goto err; 157296341Sdelphij } 158296341Sdelphij 159296341Sdelphij r = BN_mod(j, key->d, i, ctx); 160296341Sdelphij if (!r) { 161296341Sdelphij ret = -1; 162296341Sdelphij goto err; 163296341Sdelphij } 164296341Sdelphij 165296341Sdelphij if (BN_cmp(j, key->dmp1) != 0) { 166296341Sdelphij ret = 0; 167296341Sdelphij RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_DMP1_NOT_CONGRUENT_TO_D); 168296341Sdelphij } 169296341Sdelphij 170296341Sdelphij /* dmq1 = d mod (q-1)? */ 171296341Sdelphij r = BN_sub(i, key->q, BN_value_one()); 172296341Sdelphij if (!r) { 173296341Sdelphij ret = -1; 174296341Sdelphij goto err; 175296341Sdelphij } 176296341Sdelphij 177296341Sdelphij r = BN_mod(j, key->d, i, ctx); 178296341Sdelphij if (!r) { 179296341Sdelphij ret = -1; 180296341Sdelphij goto err; 181296341Sdelphij } 182296341Sdelphij 183296341Sdelphij if (BN_cmp(j, key->dmq1) != 0) { 184296341Sdelphij ret = 0; 185296341Sdelphij RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_DMQ1_NOT_CONGRUENT_TO_D); 186296341Sdelphij } 187296341Sdelphij 188296341Sdelphij /* iqmp = q^-1 mod p? */ 189296341Sdelphij if (!BN_mod_inverse(i, key->q, key->p, ctx)) { 190296341Sdelphij ret = -1; 191296341Sdelphij goto err; 192296341Sdelphij } 193296341Sdelphij 194296341Sdelphij if (BN_cmp(i, key->iqmp) != 0) { 195296341Sdelphij ret = 0; 196296341Sdelphij RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_IQMP_NOT_INVERSE_OF_Q); 197296341Sdelphij } 198296341Sdelphij } 199296341Sdelphij 20056083Skris err: 201296341Sdelphij if (i != NULL) 202296341Sdelphij BN_free(i); 203296341Sdelphij if (j != NULL) 204296341Sdelphij BN_free(j); 205296341Sdelphij if (k != NULL) 206296341Sdelphij BN_free(k); 207296341Sdelphij if (l != NULL) 208296341Sdelphij BN_free(l); 209296341Sdelphij if (m != NULL) 210296341Sdelphij BN_free(m); 211296341Sdelphij if (ctx != NULL) 212296341Sdelphij BN_CTX_free(ctx); 213296341Sdelphij return (ret); 214296341Sdelphij} 215