-/* crypto/bn/bn_blind.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1998-2016 The OpenSSL Project Authors. 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.]
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
-#include <stdio.h>
-#include "cryptlib.h"
+#include <openssl/opensslconf.h>
+#include "internal/cryptlib.h"
#include "bn_lcl.h"
-BN_BLINDING *BN_BLINDING_new(A,Ai,mod)
-BIGNUM *A;
-BIGNUM *Ai;
-BIGNUM *mod;
- {
- BN_BLINDING *ret=NULL;
-
- bn_check_top(Ai);
- bn_check_top(mod);
-
- if ((ret=(BN_BLINDING *)Malloc(sizeof(BN_BLINDING))) == NULL)
- {
- BNerr(BN_F_BN_BLINDING_NEW,ERR_R_MALLOC_FAILURE);
- return(NULL);
- }
- memset(ret,0,sizeof(BN_BLINDING));
- if ((ret->A=BN_new()) == NULL) goto err;
- if ((ret->Ai=BN_new()) == NULL) goto err;
- if (!BN_copy(ret->A,A)) goto err;
- if (!BN_copy(ret->Ai,Ai)) goto err;
- ret->mod=mod;
- return(ret);
-err:
- if (ret != NULL) BN_BLINDING_free(ret);
- return(NULL);
- }
-
-void BN_BLINDING_free(r)
-BN_BLINDING *r;
- {
- if(r == NULL)
- return;
-
- if (r->A != NULL) BN_free(r->A );
- if (r->Ai != NULL) BN_free(r->Ai);
- Free(r);
- }
-
-int BN_BLINDING_update(b,ctx)
-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 (!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:
- return(ret);
- }
-
-int BN_BLINDING_convert(n,b,ctx)
-BIGNUM *n;
-BN_BLINDING *b;
-BN_CTX *ctx;
- {
- bn_check_top(n);
-
- if ((b->A == NULL) || (b->Ai == NULL))
- {
- BNerr(BN_F_BN_BLINDING_CONVERT,BN_R_NOT_INITIALIZED);
- return(0);
- }
- return(BN_mod_mul(n,n,b->A,b->mod,ctx));
- }
-
-int BN_BLINDING_invert(n,b,ctx)
-BIGNUM *n;
-BN_BLINDING *b;
-BN_CTX *ctx;
- {
- int ret;
-
- bn_check_top(n);
- if ((b->A == NULL) || (b->Ai == NULL))
- {
- BNerr(BN_F_BN_BLINDING_INVERT,BN_R_NOT_INITIALIZED);
- return(0);
- }
- if ((ret=BN_mod_mul(n,n,b->Ai,b->mod,ctx)) >= 0)
- {
- if (!BN_BLINDING_update(b,ctx))
- return(0);
- }
- return(ret);
- }
+#define BN_BLINDING_COUNTER 32
+struct bn_blinding_st {
+ BIGNUM *A;
+ BIGNUM *Ai;
+ BIGNUM *e;
+ BIGNUM *mod; /* just a reference */
+ CRYPTO_THREAD_ID 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);
+ CRYPTO_RWLOCK *lock;
+};
+
+BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai, BIGNUM *mod)
+{
+ BN_BLINDING *ret = NULL;
+
+ bn_check_top(mod);
+
+ if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL) {
+ BNerr(BN_F_BN_BLINDING_NEW, ERR_R_MALLOC_FAILURE);
+ return NULL;
+ }
+
+ ret->lock = CRYPTO_THREAD_lock_new();
+ if (ret->lock == NULL) {
+ BNerr(BN_F_BN_BLINDING_NEW, ERR_R_MALLOC_FAILURE);
+ OPENSSL_free(ret);
+ return NULL;
+ }
+
+ BN_BLINDING_set_current_thread(ret);
+
+ 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;
+
+ 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);
+ CRYPTO_THREAD_lock_free(r->lock);
+ 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;
+}
+
+int BN_BLINDING_is_current_thread(BN_BLINDING *b)
+{
+ return CRYPTO_THREAD_compare_id(CRYPTO_THREAD_get_current_id(), b->tid);
+}
+
+void BN_BLINDING_set_current_thread(BN_BLINDING *b)
+{
+ b->tid = CRYPTO_THREAD_get_current_id();
+}
+
+int BN_BLINDING_lock(BN_BLINDING *b)
+{
+ return CRYPTO_THREAD_write_lock(b->lock);
+}
+
+int BN_BLINDING_unlock(BN_BLINDING *b)
+{
+ return CRYPTO_THREAD_unlock(b->lock);
+}
+
+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 {
+ int rv;
+ if (!BN_rand_range(ret->A, ret->mod))
+ goto err;
+ if (!int_bn_mod_inverse(ret->Ai, ret->A, ret->mod, ctx, &rv)) {
+ /*
+ * this should almost never happen for good RSA keys
+ */
+ if (rv) {
+ if (retry_counter-- == 0) {
+ BNerr(BN_F_BN_BLINDING_CREATE_PARAM,
+ BN_R_TOO_MANY_ITERATIONS);
+ goto err;
+ }
+ } 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;
+}
projects / openssl.git / blobdiff