- /* ====================================================================
- * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission. For written permission, please contact
- * openssl-core@openssl.org.
- *
- * 5. Products derived from this software may not be called "OpenSSL"
- * nor may "OpenSSL" appear in their names without prior written
- * permission of the OpenSSL Project.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
- *
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- * ====================================================================
- *
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com). This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com).
- *
- * Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.] */
-
- #include <openssl/rsa.h>
-
- #include <string.h>
-
- #include <openssl/bn.h>
- #include <openssl/mem.h>
- #include <openssl/err.h>
- #include <openssl/thread.h>
-
- #include "internal.h"
-
-
- #define BN_BLINDING_COUNTER 32
-
- struct bn_blinding_st {
- BIGNUM *A;
- BIGNUM *Ai;
- BIGNUM *e;
- BIGNUM *mod; /* just a reference */
- int counter;
- unsigned long flags;
- BN_MONT_CTX *m_ctx;
- int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
- const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
- };
-
- BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai, BIGNUM *mod) {
- BN_BLINDING *ret = NULL;
-
- ret = (BN_BLINDING*) OPENSSL_malloc(sizeof(BN_BLINDING));
- if (ret == NULL) {
- OPENSSL_PUT_ERROR(RSA, ERR_R_MALLOC_FAILURE);
- return NULL;
- }
- memset(ret, 0, sizeof(BN_BLINDING));
- if (A != NULL) {
- ret->A = BN_dup(A);
- if (ret->A == NULL) {
- goto err;
- }
- }
- if (Ai != NULL) {
- ret->Ai = BN_dup(Ai);
- if (ret->Ai == NULL) {
- goto err;
- }
- }
-
- /* save a copy of mod in the BN_BLINDING structure */
- ret->mod = BN_dup(mod);
- if (ret->mod == NULL) {
- goto err;
- }
- if (BN_get_flags(mod, BN_FLG_CONSTTIME) != 0) {
- BN_set_flags(ret->mod, BN_FLG_CONSTTIME);
- }
-
- /* Set the counter to the special value -1
- * to indicate that this is never-used fresh blinding
- * that does not need updating before first use. */
- ret->counter = -1;
- return ret;
-
- err:
- BN_BLINDING_free(ret);
- return NULL;
- }
-
- void BN_BLINDING_free(BN_BLINDING *r) {
- if (r == NULL) {
- return;
- }
-
- BN_free(r->A);
- BN_free(r->Ai);
- BN_free(r->e);
- BN_free(r->mod);
- OPENSSL_free(r);
- }
-
- int BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx) {
- int ret = 0;
-
- if (b->A == NULL || b->Ai == NULL) {
- OPENSSL_PUT_ERROR(RSA, RSA_R_BN_NOT_INITIALIZED);
- goto err;
- }
-
- if (b->counter == -1) {
- b->counter = 0;
- }
-
- if (++b->counter == BN_BLINDING_COUNTER && b->e != NULL &&
- !(b->flags & BN_BLINDING_NO_RECREATE)) {
- /* re-create blinding parameters */
- if (!BN_BLINDING_create_param(b, NULL, NULL, ctx, NULL, NULL)) {
- goto err;
- }
- } else if (!(b->flags & BN_BLINDING_NO_UPDATE)) {
- if (!BN_mod_mul(b->A, b->A, b->A, b->mod, ctx)) {
- goto err;
- }
- if (!BN_mod_mul(b->Ai, b->Ai, b->Ai, b->mod, ctx)) {
- goto err;
- }
- }
-
- ret = 1;
-
- err:
- if (b->counter == BN_BLINDING_COUNTER) {
- b->counter = 0;
- }
- return ret;
- }
-
- int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx) {
- return BN_BLINDING_convert_ex(n, NULL, b, ctx);
- }
-
- int BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx) {
- int ret = 1;
-
- if (b->A == NULL || b->Ai == NULL) {
- OPENSSL_PUT_ERROR(RSA, RSA_R_BN_NOT_INITIALIZED);
- return 0;
- }
-
- if (b->counter == -1) {
- /* Fresh blinding, doesn't need updating. */
- b->counter = 0;
- } else if (!BN_BLINDING_update(b, ctx)) {
- return 0;
- }
-
- if (r != NULL) {
- if (!BN_copy(r, b->Ai)) {
- ret = 0;
- }
- }
-
- if (!BN_mod_mul(n, n, b->A, b->mod, ctx)) {
- ret = 0;
- }
-
- return ret;
- }
-
- int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx) {
- return BN_BLINDING_invert_ex(n, NULL, b, ctx);
- }
-
- int BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b,
- BN_CTX *ctx) {
- int ret;
-
- if (r != NULL) {
- ret = BN_mod_mul(n, n, r, b->mod, ctx);
- } else {
- if (b->Ai == NULL) {
- OPENSSL_PUT_ERROR(RSA, RSA_R_BN_NOT_INITIALIZED);
- return 0;
- }
- ret = BN_mod_mul(n, n, b->Ai, b->mod, ctx);
- }
-
- return ret;
- }
-
- unsigned long BN_BLINDING_get_flags(const BN_BLINDING *b) { return b->flags; }
-
- void BN_BLINDING_set_flags(BN_BLINDING *b, unsigned long flags) {
- b->flags = flags;
- }
-
- BN_BLINDING *BN_BLINDING_create_param(
- BN_BLINDING *b, const BIGNUM *e, BIGNUM *m, BN_CTX *ctx,
- int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
- const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx),
- BN_MONT_CTX *m_ctx) {
- int retry_counter = 32;
- BN_BLINDING *ret = NULL;
-
- if (b == NULL) {
- ret = BN_BLINDING_new(NULL, NULL, m);
- } else {
- ret = b;
- }
-
- if (ret == NULL) {
- goto err;
- }
-
- if (ret->A == NULL && (ret->A = BN_new()) == NULL) {
- goto err;
- }
- if (ret->Ai == NULL && (ret->Ai = BN_new()) == NULL) {
- goto err;
- }
-
- if (e != NULL) {
- BN_free(ret->e);
- ret->e = BN_dup(e);
- }
- if (ret->e == NULL) {
- goto err;
- }
-
- if (bn_mod_exp != NULL) {
- ret->bn_mod_exp = bn_mod_exp;
- }
- if (m_ctx != NULL) {
- ret->m_ctx = m_ctx;
- }
-
- do {
- if (!BN_rand_range(ret->A, ret->mod)) {
- goto err;
- }
- if (BN_mod_inverse(ret->Ai, ret->A, ret->mod, ctx) == NULL) {
- /* this should almost never happen for good RSA keys */
- uint32_t error = ERR_peek_last_error();
- if (ERR_GET_REASON(error) == BN_R_NO_INVERSE) {
- if (retry_counter-- == 0) {
- OPENSSL_PUT_ERROR(RSA, RSA_R_TOO_MANY_ITERATIONS);
- goto err;
- }
- ERR_clear_error();
- } else {
- goto err;
- }
- } else {
- break;
- }
- } while (1);
-
- if (ret->bn_mod_exp != NULL && ret->m_ctx != NULL) {
- if (!ret->bn_mod_exp(ret->A, ret->A, ret->e, ret->mod, ctx, ret->m_ctx)) {
- goto err;
- }
- } else {
- if (!BN_mod_exp(ret->A, ret->A, ret->e, ret->mod, ctx)) {
- goto err;
- }
- }
-
- return ret;
-
- err:
- if (b == NULL) {
- BN_BLINDING_free(ret);
- ret = NULL;
- }
-
- return ret;
- }
-
- static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p,
- const BIGNUM *q, BN_CTX *ctx) {
- BIGNUM *ret = NULL, *r0, *r1, *r2;
-
- if (d == NULL || p == NULL || q == NULL) {
- return NULL;
- }
-
- BN_CTX_start(ctx);
- r0 = BN_CTX_get(ctx);
- r1 = BN_CTX_get(ctx);
- r2 = BN_CTX_get(ctx);
- if (r2 == NULL) {
- goto err;
- }
-
- if (!BN_sub(r1, p, BN_value_one())) {
- goto err;
- }
- if (!BN_sub(r2, q, BN_value_one())) {
- goto err;
- }
- if (!BN_mul(r0, r1, r2, ctx)) {
- goto err;
- }
-
- ret = BN_mod_inverse(NULL, d, r0, ctx);
-
- err:
- BN_CTX_end(ctx);
- return ret;
- }
-
- BN_BLINDING *rsa_setup_blinding(RSA *rsa, BN_CTX *in_ctx) {
- BIGNUM local_n;
- BIGNUM *e, *n;
- BN_CTX *ctx;
- BN_BLINDING *ret = NULL;
- BN_MONT_CTX *mont_ctx = NULL;
-
- if (in_ctx == NULL) {
- ctx = BN_CTX_new();
- if (ctx == NULL) {
- return 0;
- }
- } else {
- ctx = in_ctx;
- }
-
- BN_CTX_start(ctx);
- e = BN_CTX_get(ctx);
- if (e == NULL) {
- OPENSSL_PUT_ERROR(RSA, ERR_R_MALLOC_FAILURE);
- goto err;
- }
-
- if (rsa->e == NULL) {
- e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
- if (e == NULL) {
- OPENSSL_PUT_ERROR(RSA, RSA_R_NO_PUBLIC_EXPONENT);
- goto err;
- }
- } else {
- e = rsa->e;
- }
-
- n = &local_n;
- BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);
-
- if (rsa->flags & RSA_FLAG_CACHE_PUBLIC) {
- mont_ctx =
- BN_MONT_CTX_set_locked(&rsa->_method_mod_n, &rsa->lock, rsa->n, ctx);
- if (mont_ctx == NULL) {
- goto err;
- }
- }
-
- ret = BN_BLINDING_create_param(NULL, e, n, ctx, rsa->meth->bn_mod_exp,
- mont_ctx);
- if (ret == NULL) {
- OPENSSL_PUT_ERROR(RSA, ERR_R_BN_LIB);
- goto err;
- }
-
- err:
- BN_CTX_end(ctx);
- if (in_ctx == NULL) {
- BN_CTX_free(ctx);
- }
- if (rsa->e == NULL) {
- BN_free(e);
- }
-
- return ret;
- }
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