1/*
2 * Copyright (c) 2000-2001,2011,2014 Apple Inc. All Rights Reserved.
3 *
4 * The contents of this file constitute Original Code as defined in and are
5 * subject to the Apple Public Source License Version 1.2 (the 'License').
6 * You may not use this file except in compliance with the License. Please obtain
7 * a copy of the License at http://www.apple.com/publicsource and read it before
8 * using this file.
9 *
10 * This Original Code and all software distributed under the License are
11 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
12 * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
13 * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
14 * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
15 * specific language governing rights and limitations under the License.
16 */
17
18
19/* crypto/bn/bn_blind.c */
20/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
21 * All rights reserved.
22 *
23 * This package is an SSL implementation written
24 * by Eric Young (eay@cryptsoft.com).
25 * The implementation was written so as to conform with Netscapes SSL.
26 *
27 * This library is free for commercial and non-commercial use as long as
28 * the following conditions are aheared to.  The following conditions
29 * apply to all code found in this distribution, be it the RC4, RSA,
30 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
31 * included with this distribution is covered by the same copyright terms
32 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
33 *
34 * Copyright remains Eric Young's, and as such any Copyright notices in
35 * the code are not to be removed.
36 * If this package is used in a product, Eric Young should be given attribution
37 * as the author of the parts of the library used.
38 * This can be in the form of a textual message at program startup or
39 * in documentation (online or textual) provided with the package.
40 *
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
43 * are met:
44 * 1. Redistributions of source code must retain the copyright
45 *    notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 *    notice, this list of conditions and the following disclaimer in the
48 *    documentation and/or other materials provided with the distribution.
49 * 3. All advertising materials mentioning features or use of this software
50 *    must display the following acknowledgement:
51 *    "This product includes cryptographic software written by
52 *     Eric Young (eay@cryptsoft.com)"
53 *    The word 'cryptographic' can be left out if the rouines from the library
54 *    being used are not cryptographic related :-).
55 * 4. If you include any Windows specific code (or a derivative thereof) from
56 *    the apps directory (application code) you must include an acknowledgement:
57 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
58 *
59 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69 * SUCH DAMAGE.
70 *
71 * The licence and distribution terms for any publically available version or
72 * derivative of this code cannot be changed.  i.e. this code cannot simply be
73 * copied and put under another distribution licence
74 * [including the GNU Public Licence.]
75 */
76
77#include <stdio.h>
78#include "cryptlib.h"
79#include "bn_lcl.h"
80
81BN_BLINDING *BN_BLINDING_new(BIGNUM *A, BIGNUM *Ai, BIGNUM *mod)
82	{
83	BN_BLINDING *ret=NULL;
84
85	bn_check_top(Ai);
86	bn_check_top(mod);
87
88	if ((ret=(BN_BLINDING *)Malloc(sizeof(BN_BLINDING))) == NULL)
89		{
90		BNerr(BN_F_BN_BLINDING_NEW,ERR_R_MALLOC_FAILURE);
91		return(NULL);
92		}
93	memset(ret,0,sizeof(BN_BLINDING));
94	if ((ret->A=BN_new()) == NULL) goto err;
95	if ((ret->Ai=BN_new()) == NULL) goto err;
96	if (!BN_copy(ret->A,A)) goto err;
97	if (!BN_copy(ret->Ai,Ai)) goto err;
98	ret->mod=mod;
99	return(ret);
100err:
101	if (ret != NULL) BN_BLINDING_free(ret);
102	return(NULL);
103	}
104
105void BN_BLINDING_free(BN_BLINDING *r)
106	{
107	if(r == NULL)
108	    return;
109
110	if (r->A  != NULL) BN_free(r->A );
111	if (r->Ai != NULL) BN_free(r->Ai);
112	Free(r);
113	}
114
115int BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx)
116	{
117	int ret=0;
118
119	if ((b->A == NULL) || (b->Ai == NULL))
120		{
121		BNerr(BN_F_BN_BLINDING_UPDATE,BN_R_NOT_INITIALIZED);
122		goto err;
123		}
124
125	if (!BN_mod_mul(b->A,b->A,b->A,b->mod,ctx)) goto err;
126	if (!BN_mod_mul(b->Ai,b->Ai,b->Ai,b->mod,ctx)) goto err;
127
128	ret=1;
129err:
130	return(ret);
131	}
132
133int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx)
134	{
135	bn_check_top(n);
136
137	if ((b->A == NULL) || (b->Ai == NULL))
138		{
139		BNerr(BN_F_BN_BLINDING_CONVERT,BN_R_NOT_INITIALIZED);
140		return(0);
141		}
142	return(BN_mod_mul(n,n,b->A,b->mod,ctx));
143	}
144
145int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx)
146	{
147	int ret;
148
149	bn_check_top(n);
150	if ((b->A == NULL) || (b->Ai == NULL))
151		{
152		BNerr(BN_F_BN_BLINDING_INVERT,BN_R_NOT_INITIALIZED);
153		return(0);
154		}
155	if ((ret=BN_mod_mul(n,n,b->Ai,b->mod,ctx)) >= 0)
156		{
157		if (!BN_BLINDING_update(b,ctx))
158			return(0);
159		}
160	return(ret);
161	}
162
163