388 lines
11 KiB
C
388 lines
11 KiB
C
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/* $OpenBSD: bn_blind.c,v 1.17 2017/01/29 17:49:22 beck Exp $ */
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/* ====================================================================
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* Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include <openssl/opensslconf.h>
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#include <openssl/err.h>
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#include "bn_lcl.h"
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#define BN_BLINDING_COUNTER 32
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struct bn_blinding_st {
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BIGNUM *A;
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BIGNUM *Ai;
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BIGNUM *e;
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BIGNUM *mod; /* just a reference */
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#ifndef OPENSSL_NO_DEPRECATED
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unsigned long thread_id; /* added in OpenSSL 0.9.6j and 0.9.7b;
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* used only by crypto/rsa/rsa_eay.c, rsa_lib.c */
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#endif
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CRYPTO_THREADID tid;
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int counter;
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unsigned long flags;
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BN_MONT_CTX *m_ctx;
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int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
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const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
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};
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BN_BLINDING *
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BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai, BIGNUM *mod)
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{
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BN_BLINDING *ret = NULL;
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bn_check_top(mod);
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if ((ret = calloc(1, sizeof(BN_BLINDING))) == NULL) {
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BNerror(ERR_R_MALLOC_FAILURE);
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return (NULL);
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}
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if (A != NULL) {
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if ((ret->A = BN_dup(A)) == NULL)
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goto err;
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}
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if (Ai != NULL) {
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if ((ret->Ai = BN_dup(Ai)) == NULL)
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goto err;
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}
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/* save a copy of mod in the BN_BLINDING structure */
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if ((ret->mod = BN_dup(mod)) == NULL)
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goto err;
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if (BN_get_flags(mod, BN_FLG_CONSTTIME) != 0)
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BN_set_flags(ret->mod, BN_FLG_CONSTTIME);
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/* Set the counter to the special value -1
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* to indicate that this is never-used fresh blinding
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* that does not need updating before first use. */
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ret->counter = -1;
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CRYPTO_THREADID_current(&ret->tid);
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return (ret);
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err:
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if (ret != NULL)
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BN_BLINDING_free(ret);
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return (NULL);
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}
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void
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BN_BLINDING_free(BN_BLINDING *r)
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{
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if (r == NULL)
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return;
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BN_clear_free(r->A);
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BN_clear_free(r->Ai);
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BN_clear_free(r->e);
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BN_clear_free(r->mod);
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free(r);
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}
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int
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BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx)
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{
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int ret = 0;
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if ((b->A == NULL) || (b->Ai == NULL)) {
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BNerror(BN_R_NOT_INITIALIZED);
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goto err;
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}
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if (b->counter == -1)
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b->counter = 0;
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if (++b->counter == BN_BLINDING_COUNTER && b->e != NULL &&
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!(b->flags & BN_BLINDING_NO_RECREATE)) {
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/* re-create blinding parameters */
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if (!BN_BLINDING_create_param(b, NULL, NULL, ctx, NULL, NULL))
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goto err;
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} else if (!(b->flags & BN_BLINDING_NO_UPDATE)) {
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if (!BN_mod_mul(b->A, b->A, b->A, b->mod, ctx))
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goto err;
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if (!BN_mod_mul(b->Ai, b->Ai, b->Ai, b->mod, ctx))
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goto err;
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}
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ret = 1;
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err:
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if (b->counter == BN_BLINDING_COUNTER)
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b->counter = 0;
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return (ret);
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}
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int
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BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx)
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{
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return BN_BLINDING_convert_ex(n, NULL, b, ctx);
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}
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int
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BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx)
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{
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int ret = 1;
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bn_check_top(n);
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if ((b->A == NULL) || (b->Ai == NULL)) {
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BNerror(BN_R_NOT_INITIALIZED);
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return (0);
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}
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if (b->counter == -1)
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/* Fresh blinding, doesn't need updating. */
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b->counter = 0;
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else if (!BN_BLINDING_update(b, ctx))
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return (0);
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if (r != NULL) {
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if (!BN_copy(r, b->Ai))
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ret = 0;
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}
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if (!BN_mod_mul(n, n,b->A, b->mod, ctx))
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ret = 0;
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return ret;
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}
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int
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BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx)
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{
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return BN_BLINDING_invert_ex(n, NULL, b, ctx);
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}
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int
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BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx)
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{
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int ret;
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bn_check_top(n);
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if (r != NULL)
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ret = BN_mod_mul(n, n, r, b->mod, ctx);
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else {
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if (b->Ai == NULL) {
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BNerror(BN_R_NOT_INITIALIZED);
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return (0);
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}
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ret = BN_mod_mul(n, n, b->Ai, b->mod, ctx);
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}
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bn_check_top(n);
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return (ret);
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}
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#ifndef OPENSSL_NO_DEPRECATED
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unsigned long
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BN_BLINDING_get_thread_id(const BN_BLINDING *b)
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{
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return b->thread_id;
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}
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void
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BN_BLINDING_set_thread_id(BN_BLINDING *b, unsigned long n)
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{
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b->thread_id = n;
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}
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#endif
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CRYPTO_THREADID *
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BN_BLINDING_thread_id(BN_BLINDING *b)
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{
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return &b->tid;
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}
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unsigned long
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BN_BLINDING_get_flags(const BN_BLINDING *b)
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{
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return b->flags;
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}
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void
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BN_BLINDING_set_flags(BN_BLINDING *b, unsigned long flags)
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{
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b->flags = flags;
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}
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BN_BLINDING *
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BN_BLINDING_create_param(BN_BLINDING *b, const BIGNUM *e, BIGNUM *m,
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BN_CTX *ctx, int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
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const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx), BN_MONT_CTX *m_ctx)
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{
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int retry_counter = 32;
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BN_BLINDING *ret = NULL;
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if (b == NULL)
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ret = BN_BLINDING_new(NULL, NULL, m);
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else
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ret = b;
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if (ret == NULL)
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goto err;
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if (ret->A == NULL && (ret->A = BN_new()) == NULL)
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goto err;
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if (ret->Ai == NULL && (ret->Ai = BN_new()) == NULL)
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goto err;
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if (e != NULL) {
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BN_free(ret->e);
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ret->e = BN_dup(e);
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}
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if (ret->e == NULL)
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goto err;
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if (bn_mod_exp != NULL)
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ret->bn_mod_exp = bn_mod_exp;
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if (m_ctx != NULL)
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ret->m_ctx = m_ctx;
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do {
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if (!BN_rand_range(ret->A, ret->mod))
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goto err;
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if (BN_mod_inverse_ct(ret->Ai, ret->A, ret->mod, ctx) == NULL) {
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/* this should almost never happen for good RSA keys */
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unsigned long error = ERR_peek_last_error();
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if (ERR_GET_REASON(error) == BN_R_NO_INVERSE) {
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if (retry_counter-- == 0) {
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BNerror(BN_R_TOO_MANY_ITERATIONS);
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goto err;
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}
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ERR_clear_error();
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} else
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goto err;
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} else
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break;
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} 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_ct(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;
|
||
|
|
}
|