1*0Sstevel@tonic-gate /* crypto/rsa/rsa_chk.c -*- Mode: C; c-file-style: "eay" -*- */ 2*0Sstevel@tonic-gate /* ==================================================================== 3*0Sstevel@tonic-gate * Copyright (c) 1999 The OpenSSL Project. All rights reserved. 4*0Sstevel@tonic-gate * 5*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without 6*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions 7*0Sstevel@tonic-gate * are met: 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the above copyright 10*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer. 11*0Sstevel@tonic-gate * 12*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright 13*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in 14*0Sstevel@tonic-gate * the documentation and/or other materials provided with the 15*0Sstevel@tonic-gate * distribution. 16*0Sstevel@tonic-gate * 17*0Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this 18*0Sstevel@tonic-gate * software must display the following acknowledgment: 19*0Sstevel@tonic-gate * "This product includes software developed by the OpenSSL Project 20*0Sstevel@tonic-gate * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 21*0Sstevel@tonic-gate * 22*0Sstevel@tonic-gate * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 23*0Sstevel@tonic-gate * endorse or promote products derived from this software without 24*0Sstevel@tonic-gate * prior written permission. For written permission, please contact 25*0Sstevel@tonic-gate * openssl-core@OpenSSL.org. 26*0Sstevel@tonic-gate * 27*0Sstevel@tonic-gate * 5. Products derived from this software may not be called "OpenSSL" 28*0Sstevel@tonic-gate * nor may "OpenSSL" appear in their names without prior written 29*0Sstevel@tonic-gate * permission of the OpenSSL Project. 30*0Sstevel@tonic-gate * 31*0Sstevel@tonic-gate * 6. Redistributions of any form whatsoever must retain the following 32*0Sstevel@tonic-gate * acknowledgment: 33*0Sstevel@tonic-gate * "This product includes software developed by the OpenSSL Project 34*0Sstevel@tonic-gate * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 35*0Sstevel@tonic-gate * 36*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 37*0Sstevel@tonic-gate * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 38*0Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 39*0Sstevel@tonic-gate * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 40*0Sstevel@tonic-gate * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 41*0Sstevel@tonic-gate * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 42*0Sstevel@tonic-gate * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 43*0Sstevel@tonic-gate * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 44*0Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 45*0Sstevel@tonic-gate * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 46*0Sstevel@tonic-gate * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 47*0Sstevel@tonic-gate * OF THE POSSIBILITY OF SUCH DAMAGE. 48*0Sstevel@tonic-gate * ==================================================================== 49*0Sstevel@tonic-gate */ 50*0Sstevel@tonic-gate 51*0Sstevel@tonic-gate #include <openssl/bn.h> 52*0Sstevel@tonic-gate #include <openssl/err.h> 53*0Sstevel@tonic-gate #include <openssl/rsa.h> 54*0Sstevel@tonic-gate 55*0Sstevel@tonic-gate 56*0Sstevel@tonic-gate int RSA_check_key(const RSA *key) 57*0Sstevel@tonic-gate { 58*0Sstevel@tonic-gate BIGNUM *i, *j, *k, *l, *m; 59*0Sstevel@tonic-gate BN_CTX *ctx; 60*0Sstevel@tonic-gate int r; 61*0Sstevel@tonic-gate int ret=1; 62*0Sstevel@tonic-gate 63*0Sstevel@tonic-gate i = BN_new(); 64*0Sstevel@tonic-gate j = BN_new(); 65*0Sstevel@tonic-gate k = BN_new(); 66*0Sstevel@tonic-gate l = BN_new(); 67*0Sstevel@tonic-gate m = BN_new(); 68*0Sstevel@tonic-gate ctx = BN_CTX_new(); 69*0Sstevel@tonic-gate if (i == NULL || j == NULL || k == NULL || l == NULL || 70*0Sstevel@tonic-gate m == NULL || ctx == NULL) 71*0Sstevel@tonic-gate { 72*0Sstevel@tonic-gate ret = -1; 73*0Sstevel@tonic-gate RSAerr(RSA_F_RSA_CHECK_KEY, ERR_R_MALLOC_FAILURE); 74*0Sstevel@tonic-gate goto err; 75*0Sstevel@tonic-gate } 76*0Sstevel@tonic-gate 77*0Sstevel@tonic-gate /* p prime? */ 78*0Sstevel@tonic-gate r = BN_is_prime(key->p, BN_prime_checks, NULL, NULL, NULL); 79*0Sstevel@tonic-gate if (r != 1) 80*0Sstevel@tonic-gate { 81*0Sstevel@tonic-gate ret = r; 82*0Sstevel@tonic-gate if (r != 0) 83*0Sstevel@tonic-gate goto err; 84*0Sstevel@tonic-gate RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_P_NOT_PRIME); 85*0Sstevel@tonic-gate } 86*0Sstevel@tonic-gate 87*0Sstevel@tonic-gate /* q prime? */ 88*0Sstevel@tonic-gate r = BN_is_prime(key->q, BN_prime_checks, NULL, NULL, NULL); 89*0Sstevel@tonic-gate if (r != 1) 90*0Sstevel@tonic-gate { 91*0Sstevel@tonic-gate ret = r; 92*0Sstevel@tonic-gate if (r != 0) 93*0Sstevel@tonic-gate goto err; 94*0Sstevel@tonic-gate RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_Q_NOT_PRIME); 95*0Sstevel@tonic-gate } 96*0Sstevel@tonic-gate 97*0Sstevel@tonic-gate /* n = p*q? */ 98*0Sstevel@tonic-gate r = BN_mul(i, key->p, key->q, ctx); 99*0Sstevel@tonic-gate if (!r) { ret = -1; goto err; } 100*0Sstevel@tonic-gate 101*0Sstevel@tonic-gate if (BN_cmp(i, key->n) != 0) 102*0Sstevel@tonic-gate { 103*0Sstevel@tonic-gate ret = 0; 104*0Sstevel@tonic-gate RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_N_DOES_NOT_EQUAL_P_Q); 105*0Sstevel@tonic-gate } 106*0Sstevel@tonic-gate 107*0Sstevel@tonic-gate /* d*e = 1 mod lcm(p-1,q-1)? */ 108*0Sstevel@tonic-gate 109*0Sstevel@tonic-gate r = BN_sub(i, key->p, BN_value_one()); 110*0Sstevel@tonic-gate if (!r) { ret = -1; goto err; } 111*0Sstevel@tonic-gate r = BN_sub(j, key->q, BN_value_one()); 112*0Sstevel@tonic-gate if (!r) { ret = -1; goto err; } 113*0Sstevel@tonic-gate 114*0Sstevel@tonic-gate /* now compute k = lcm(i,j) */ 115*0Sstevel@tonic-gate r = BN_mul(l, i, j, ctx); 116*0Sstevel@tonic-gate if (!r) { ret = -1; goto err; } 117*0Sstevel@tonic-gate r = BN_gcd(m, i, j, ctx); 118*0Sstevel@tonic-gate if (!r) { ret = -1; goto err; } 119*0Sstevel@tonic-gate r = BN_div(k, NULL, l, m, ctx); /* remainder is 0 */ 120*0Sstevel@tonic-gate if (!r) { ret = -1; goto err; } 121*0Sstevel@tonic-gate 122*0Sstevel@tonic-gate r = BN_mod_mul(i, key->d, key->e, k, ctx); 123*0Sstevel@tonic-gate if (!r) { ret = -1; goto err; } 124*0Sstevel@tonic-gate 125*0Sstevel@tonic-gate if (!BN_is_one(i)) 126*0Sstevel@tonic-gate { 127*0Sstevel@tonic-gate ret = 0; 128*0Sstevel@tonic-gate RSAerr(RSA_F_RSA_CHECK_KEY, RSA_R_D_E_NOT_CONGRUENT_TO_1); 129*0Sstevel@tonic-gate } 130*0Sstevel@tonic-gate 131*0Sstevel@tonic-gate if (key->dmp1 != NULL && key->dmq1 != NULL && key->iqmp != NULL) 132*0Sstevel@tonic-gate { 133*0Sstevel@tonic-gate /* dmp1 = d mod (p-1)? */ 134*0Sstevel@tonic-gate r = BN_sub(i, key->p, BN_value_one()); 135*0Sstevel@tonic-gate if (!r) { ret = -1; goto err; } 136*0Sstevel@tonic-gate 137*0Sstevel@tonic-gate r = BN_mod(j, key->d, i, ctx); 138*0Sstevel@tonic-gate if (!r) { ret = -1; goto err; } 139*0Sstevel@tonic-gate 140*0Sstevel@tonic-gate if (BN_cmp(j, key->dmp1) != 0) 141*0Sstevel@tonic-gate { 142*0Sstevel@tonic-gate ret = 0; 143*0Sstevel@tonic-gate RSAerr(RSA_F_RSA_CHECK_KEY, 144*0Sstevel@tonic-gate RSA_R_DMP1_NOT_CONGRUENT_TO_D); 145*0Sstevel@tonic-gate } 146*0Sstevel@tonic-gate 147*0Sstevel@tonic-gate /* dmq1 = d mod (q-1)? */ 148*0Sstevel@tonic-gate r = BN_sub(i, key->q, BN_value_one()); 149*0Sstevel@tonic-gate if (!r) { ret = -1; goto err; } 150*0Sstevel@tonic-gate 151*0Sstevel@tonic-gate r = BN_mod(j, key->d, i, ctx); 152*0Sstevel@tonic-gate if (!r) { ret = -1; goto err; } 153*0Sstevel@tonic-gate 154*0Sstevel@tonic-gate if (BN_cmp(j, key->dmq1) != 0) 155*0Sstevel@tonic-gate { 156*0Sstevel@tonic-gate ret = 0; 157*0Sstevel@tonic-gate RSAerr(RSA_F_RSA_CHECK_KEY, 158*0Sstevel@tonic-gate RSA_R_DMQ1_NOT_CONGRUENT_TO_D); 159*0Sstevel@tonic-gate } 160*0Sstevel@tonic-gate 161*0Sstevel@tonic-gate /* iqmp = q^-1 mod p? */ 162*0Sstevel@tonic-gate if(!BN_mod_inverse(i, key->q, key->p, ctx)) 163*0Sstevel@tonic-gate { 164*0Sstevel@tonic-gate ret = -1; 165*0Sstevel@tonic-gate goto err; 166*0Sstevel@tonic-gate } 167*0Sstevel@tonic-gate 168*0Sstevel@tonic-gate if (BN_cmp(i, key->iqmp) != 0) 169*0Sstevel@tonic-gate { 170*0Sstevel@tonic-gate ret = 0; 171*0Sstevel@tonic-gate RSAerr(RSA_F_RSA_CHECK_KEY, 172*0Sstevel@tonic-gate RSA_R_IQMP_NOT_INVERSE_OF_Q); 173*0Sstevel@tonic-gate } 174*0Sstevel@tonic-gate } 175*0Sstevel@tonic-gate 176*0Sstevel@tonic-gate err: 177*0Sstevel@tonic-gate if (i != NULL) BN_free(i); 178*0Sstevel@tonic-gate if (j != NULL) BN_free(j); 179*0Sstevel@tonic-gate if (k != NULL) BN_free(k); 180*0Sstevel@tonic-gate if (l != NULL) BN_free(l); 181*0Sstevel@tonic-gate if (m != NULL) BN_free(m); 182*0Sstevel@tonic-gate if (ctx != NULL) BN_CTX_free(ctx); 183*0Sstevel@tonic-gate return (ret); 184*0Sstevel@tonic-gate } 185