| /* crypto/bn/bn_blind.c */ |
| /* ==================================================================== |
| * 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 <stdio.h> |
| #include "cryptlib.h" |
| #include "bn_lcl.h" |
| |
| #define BN_BLINDING_COUNTER 32 |
| |
| struct bn_blinding_st { |
| BIGNUM *A; |
| BIGNUM *Ai; |
| BIGNUM *e; |
| BIGNUM *mod; /* just a reference */ |
| #ifndef OPENSSL_NO_DEPRECATED |
| unsigned long thread_id; /* added in OpenSSL 0.9.6j and 0.9.7b; used |
| * only by crypto/rsa/rsa_eay.c, rsa_lib.c */ |
| #endif |
| CRYPTO_THREADID tid; |
| 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; |
| |
| bn_check_top(mod); |
| |
| if ((ret = (BN_BLINDING *)OPENSSL_malloc(sizeof(BN_BLINDING))) == NULL) { |
| BNerr(BN_F_BN_BLINDING_NEW, ERR_R_MALLOC_FAILURE); |
| return (NULL); |
| } |
| memset(ret, 0, sizeof(BN_BLINDING)); |
| if (A != NULL) { |
| if ((ret->A = BN_dup(A)) == NULL) |
| goto err; |
| } |
| if (Ai != NULL) { |
| if ((ret->Ai = BN_dup(Ai)) == NULL) |
| goto err; |
| } |
| |
| /* save a copy of mod in the BN_BLINDING structure */ |
| if ((ret->mod = BN_dup(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; |
| CRYPTO_THREADID_current(&ret->tid); |
| return (ret); |
| err: |
| if (ret != NULL) |
| BN_BLINDING_free(ret); |
| return (NULL); |
| } |
| |
| void BN_BLINDING_free(BN_BLINDING *r) |
| { |
| if (r == NULL) |
| return; |
| |
| if (r->A != NULL) |
| BN_free(r->A); |
| if (r->Ai != NULL) |
| BN_free(r->Ai); |
| if (r->e != NULL) |
| BN_free(r->e); |
| if (r->mod != NULL) |
| 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)) { |
| BNerr(BN_F_BN_BLINDING_UPDATE, BN_R_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; |
| |
| bn_check_top(n); |
| |
| if ((b->A == NULL) || (b->Ai == NULL)) { |
| BNerr(BN_F_BN_BLINDING_CONVERT_EX, BN_R_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; |
| |
| bn_check_top(n); |
| |
| if (r != NULL) |
| ret = BN_mod_mul(n, n, r, b->mod, ctx); |
| else { |
| if (b->Ai == NULL) { |
| BNerr(BN_F_BN_BLINDING_INVERT_EX, BN_R_NOT_INITIALIZED); |
| return (0); |
| } |
| ret = BN_mod_mul(n, n, b->Ai, b->mod, ctx); |
| } |
| |
| bn_check_top(n); |
| return (ret); |
| } |
| |
| #ifndef OPENSSL_NO_DEPRECATED |
| unsigned long BN_BLINDING_get_thread_id(const BN_BLINDING *b) |
| { |
| return b->thread_id; |
| } |
| |
| void BN_BLINDING_set_thread_id(BN_BLINDING *b, unsigned long n) |
| { |
| b->thread_id = n; |
| } |
| #endif |
| |
| CRYPTO_THREADID *BN_BLINDING_thread_id(BN_BLINDING *b) |
| { |
| return &b->tid; |
| } |
| |
| 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) { |
| if (ret->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 |
| */ |
| unsigned long error = ERR_peek_last_error(); |
| if (ERR_GET_REASON(error) == BN_R_NO_INVERSE) { |
| if (retry_counter-- == 0) { |
| BNerr(BN_F_BN_BLINDING_CREATE_PARAM, |
| BN_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 && ret != NULL) { |
| BN_BLINDING_free(ret); |
| ret = NULL; |
| } |
| |
| return ret; |
| } |
