source: trunk/cscrypt/bn_ctx.c@ 3181

Last change on this file since 3181 was 3181, checked in by dingo35, 10 years ago

Adding threadsafety FIXMEs, feel free to join checking..

File size: 4.2 KB
Line 
1//FIXME Not checked on threadsafety yet; after checking please remove this line
2/* crypto/bn/bn_ctx.c */
3/* Written by Ulf Moeller for the OpenSSL project. */
4/* ====================================================================
5 * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
23 *
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * openssl-core@openssl.org.
28 *
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
32 *
33 * 6. Redistributions of any form whatsoever must retain the following
34 * acknowledgment:
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
37 *
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
51 *
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com).
55 *
56 */
57
58#ifndef BN_CTX_DEBUG
59# undef NDEBUG /* avoid conflicting definitions */
60# define NDEBUG
61#endif
62
63#include <stdio.h>
64#include <assert.h>
65#include "bn.h"
66#include "openssl_mods.h"
67
68BN_CTX *BN_CTX_new(void)
69 {
70 BN_CTX *ret;
71
72 ret=(BN_CTX *)OPENSSL_malloc(sizeof(BN_CTX));
73 if (ret == NULL)
74 {
75 return(NULL);
76 }
77
78 BN_CTX_init(ret);
79 ret->flags=BN_FLG_MALLOCED;
80 return(ret);
81 }
82
83void BN_CTX_init(BN_CTX *ctx)
84 {
85 int i;
86 ctx->tos = 0;
87 ctx->flags = 0;
88 ctx->depth = 0;
89 ctx->too_many = 0;
90 for (i = 0; i < BN_CTX_NUM; i++)
91 BN_init(&(ctx->bn[i]));
92 }
93
94void BN_CTX_free(BN_CTX *ctx)
95 {
96 int i;
97
98 if (ctx == NULL) return;
99 assert(ctx->depth == 0);
100
101 for (i=0; i < BN_CTX_NUM; i++)
102 BN_clear_free(&(ctx->bn[i]));
103 if (ctx->flags & BN_FLG_MALLOCED)
104 OPENSSL_free(ctx);
105 }
106
107void BN_CTX_start(BN_CTX *ctx)
108 {
109 if (ctx->depth < BN_CTX_NUM_POS)
110 ctx->pos[ctx->depth] = ctx->tos;
111 ctx->depth++;
112 }
113
114BIGNUM *BN_CTX_get(BN_CTX *ctx)
115 {
116 if (ctx->depth > BN_CTX_NUM_POS || ctx->tos >= BN_CTX_NUM)
117 {
118 if (!ctx->too_many)
119 {
120 /* disable error code until BN_CTX_end is called: */
121 ctx->too_many = 1;
122 }
123 return NULL;
124 }
125 return (&(ctx->bn[ctx->tos++]));
126 }
127
128void BN_CTX_end(BN_CTX *ctx)
129 {
130 if (ctx == NULL) return;
131 assert(ctx->depth > 0);
132 if (ctx->depth == 0)
133 /* should never happen, but we can tolerate it if not in
134 * debug mode (could be a 'goto err' in the calling function
135 * before BN_CTX_start was reached) */
136 BN_CTX_start(ctx);
137
138 ctx->too_many = 0;
139 ctx->depth--;
140 if (ctx->depth < BN_CTX_NUM_POS)
141 ctx->tos = ctx->pos[ctx->depth];
142 }
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