386 lines
11 KiB
C
386 lines
11 KiB
C
/* 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;
|
|
}
|