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228 lines
6 KiB
C
228 lines
6 KiB
C
/*
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* Copyright 1999-2017 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/bn.h>
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#include <openssl/err.h>
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#include "rsa_local.h"
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int RSA_check_key(const RSA *key)
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{
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return RSA_check_key_ex(key, NULL);
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}
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int RSA_check_key_ex(const RSA *key, BN_GENCB *cb)
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{
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BIGNUM *i, *j, *k, *l, *m;
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BN_CTX *ctx;
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int ret = 1, ex_primes = 0, idx;
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RSA_PRIME_INFO *pinfo;
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if (key->p == NULL || key->q == NULL || key->n == NULL
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|| key->e == NULL || key->d == NULL) {
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RSAerr(RSA_F_RSA_CHECK_KEY_EX, RSA_R_VALUE_MISSING);
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return 0;
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}
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/* multi-prime? */
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if (key->version == RSA_ASN1_VERSION_MULTI) {
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ex_primes = sk_RSA_PRIME_INFO_num(key->prime_infos);
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if (ex_primes <= 0
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|| (ex_primes + 2) > rsa_multip_cap(BN_num_bits(key->n))) {
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RSAerr(RSA_F_RSA_CHECK_KEY_EX, RSA_R_INVALID_MULTI_PRIME_KEY);
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return 0;
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}
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}
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i = BN_new();
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j = BN_new();
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k = BN_new();
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l = BN_new();
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m = BN_new();
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ctx = BN_CTX_new();
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if (i == NULL || j == NULL || k == NULL || l == NULL
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|| m == NULL || ctx == NULL) {
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ret = -1;
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RSAerr(RSA_F_RSA_CHECK_KEY_EX, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (BN_is_one(key->e)) {
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ret = 0;
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RSAerr(RSA_F_RSA_CHECK_KEY_EX, RSA_R_BAD_E_VALUE);
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}
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if (!BN_is_odd(key->e)) {
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ret = 0;
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RSAerr(RSA_F_RSA_CHECK_KEY_EX, RSA_R_BAD_E_VALUE);
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}
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/* p prime? */
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if (BN_is_prime_ex(key->p, BN_prime_checks, NULL, cb) != 1) {
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ret = 0;
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RSAerr(RSA_F_RSA_CHECK_KEY_EX, RSA_R_P_NOT_PRIME);
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}
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/* q prime? */
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if (BN_is_prime_ex(key->q, BN_prime_checks, NULL, cb) != 1) {
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ret = 0;
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RSAerr(RSA_F_RSA_CHECK_KEY_EX, RSA_R_Q_NOT_PRIME);
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}
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/* r_i prime? */
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for (idx = 0; idx < ex_primes; idx++) {
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pinfo = sk_RSA_PRIME_INFO_value(key->prime_infos, idx);
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if (BN_is_prime_ex(pinfo->r, BN_prime_checks, NULL, cb) != 1) {
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ret = 0;
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RSAerr(RSA_F_RSA_CHECK_KEY_EX, RSA_R_MP_R_NOT_PRIME);
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}
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}
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/* n = p*q * r_3...r_i? */
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if (!BN_mul(i, key->p, key->q, ctx)) {
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ret = -1;
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goto err;
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}
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for (idx = 0; idx < ex_primes; idx++) {
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pinfo = sk_RSA_PRIME_INFO_value(key->prime_infos, idx);
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if (!BN_mul(i, i, pinfo->r, ctx)) {
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ret = -1;
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goto err;
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}
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}
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if (BN_cmp(i, key->n) != 0) {
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ret = 0;
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if (ex_primes)
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RSAerr(RSA_F_RSA_CHECK_KEY_EX,
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RSA_R_N_DOES_NOT_EQUAL_PRODUCT_OF_PRIMES);
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else
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RSAerr(RSA_F_RSA_CHECK_KEY_EX, RSA_R_N_DOES_NOT_EQUAL_P_Q);
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}
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/* d*e = 1 mod \lambda(n)? */
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if (!BN_sub(i, key->p, BN_value_one())) {
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ret = -1;
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goto err;
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}
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if (!BN_sub(j, key->q, BN_value_one())) {
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ret = -1;
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goto err;
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}
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/* now compute k = \lambda(n) = LCM(i, j, r_3 - 1...) */
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if (!BN_mul(l, i, j, ctx)) {
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ret = -1;
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goto err;
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}
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if (!BN_gcd(m, i, j, ctx)) {
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ret = -1;
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goto err;
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}
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for (idx = 0; idx < ex_primes; idx++) {
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pinfo = sk_RSA_PRIME_INFO_value(key->prime_infos, idx);
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if (!BN_sub(k, pinfo->r, BN_value_one())) {
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ret = -1;
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goto err;
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}
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if (!BN_mul(l, l, k, ctx)) {
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ret = -1;
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goto err;
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}
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if (!BN_gcd(m, m, k, ctx)) {
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ret = -1;
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goto err;
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}
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}
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if (!BN_div(k, NULL, l, m, ctx)) { /* remainder is 0 */
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ret = -1;
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goto err;
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}
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if (!BN_mod_mul(i, key->d, key->e, k, ctx)) {
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ret = -1;
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goto err;
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}
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if (!BN_is_one(i)) {
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ret = 0;
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RSAerr(RSA_F_RSA_CHECK_KEY_EX, RSA_R_D_E_NOT_CONGRUENT_TO_1);
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}
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if (key->dmp1 != NULL && key->dmq1 != NULL && key->iqmp != NULL) {
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/* dmp1 = d mod (p-1)? */
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if (!BN_sub(i, key->p, BN_value_one())) {
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ret = -1;
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goto err;
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}
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if (!BN_mod(j, key->d, i, ctx)) {
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ret = -1;
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goto err;
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}
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if (BN_cmp(j, key->dmp1) != 0) {
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ret = 0;
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RSAerr(RSA_F_RSA_CHECK_KEY_EX, RSA_R_DMP1_NOT_CONGRUENT_TO_D);
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}
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/* dmq1 = d mod (q-1)? */
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if (!BN_sub(i, key->q, BN_value_one())) {
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ret = -1;
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goto err;
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}
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if (!BN_mod(j, key->d, i, ctx)) {
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ret = -1;
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goto err;
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}
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if (BN_cmp(j, key->dmq1) != 0) {
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ret = 0;
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RSAerr(RSA_F_RSA_CHECK_KEY_EX, RSA_R_DMQ1_NOT_CONGRUENT_TO_D);
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}
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/* iqmp = q^-1 mod p? */
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if (!BN_mod_inverse(i, key->q, key->p, ctx)) {
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ret = -1;
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goto err;
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}
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if (BN_cmp(i, key->iqmp) != 0) {
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ret = 0;
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RSAerr(RSA_F_RSA_CHECK_KEY_EX, RSA_R_IQMP_NOT_INVERSE_OF_Q);
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}
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}
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for (idx = 0; idx < ex_primes; idx++) {
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pinfo = sk_RSA_PRIME_INFO_value(key->prime_infos, idx);
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/* d_i = d mod (r_i - 1)? */
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if (!BN_sub(i, pinfo->r, BN_value_one())) {
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ret = -1;
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goto err;
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}
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if (!BN_mod(j, key->d, i, ctx)) {
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ret = -1;
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goto err;
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}
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if (BN_cmp(j, pinfo->d) != 0) {
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ret = 0;
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RSAerr(RSA_F_RSA_CHECK_KEY_EX, RSA_R_MP_EXPONENT_NOT_CONGRUENT_TO_D);
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}
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/* t_i = R_i ^ -1 mod r_i ? */
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if (!BN_mod_inverse(i, pinfo->pp, pinfo->r, ctx)) {
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ret = -1;
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goto err;
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}
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if (BN_cmp(i, pinfo->t) != 0) {
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ret = 0;
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RSAerr(RSA_F_RSA_CHECK_KEY_EX, RSA_R_MP_COEFFICIENT_NOT_INVERSE_OF_R);
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}
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}
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err:
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BN_free(i);
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BN_free(j);
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BN_free(k);
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BN_free(l);
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BN_free(m);
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BN_CTX_free(ctx);
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return ret;
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}
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