1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
/* crypto/bn/bn_ctx.c */
/* Written by Ulf Moeller for the OpenSSL project. */
/* ====================================================================
* Copyright (c) 1998-2000 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).
*
*/
#include <stdio.h>
#include <assert.h>
#include "cryptlib.h"
#include <openssl/bn.h>
BN_CTX *BN_CTX_new(void)
{
BN_CTX *ret;
ret=(BN_CTX *)Malloc(sizeof(BN_CTX));
if (ret == NULL)
{
BNerr(BN_F_BN_CTX_NEW,ERR_R_MALLOC_FAILURE);
return(NULL);
}
BN_CTX_init(ret);
ret->flags=BN_FLG_MALLOCED;
return(ret);
}
void BN_CTX_init(BN_CTX *ctx)
{
int i;
ctx->tos = 0;
ctx->flags = 0;
ctx->depth = 0;
for (i = 0; i < BN_CTX_NUM; i++)
BN_init(&(ctx->bn[i]));
}
void BN_CTX_free(BN_CTX *ctx)
{
int i;
if (ctx == NULL) return;
assert(ctx->depth == 0);
for (i=0; i < BN_CTX_NUM; i++)
BN_clear_free(&(ctx->bn[i]));
if (ctx->flags & BN_FLG_MALLOCED)
Free(ctx);
}
void BN_CTX_start(BN_CTX *ctx)
{
ctx->pos[ctx->depth++] = ctx->tos;
}
BIGNUM *BN_CTX_get(BN_CTX *ctx)
{
if (ctx->tos >= BN_CTX_NUM)
{
BNerr(BN_F_BN_CTX_GET,BN_R_TOO_MANY_TEMPORARY_VARIABLES);
return NULL;
}
return (&(ctx->bn[ctx->tos++]));
}
void BN_CTX_end(BN_CTX *ctx)
{
if (ctx == NULL) return;
assert(ctx->depth > 0);
ctx->depth--;
ctx->tos = ctx->pos[ctx->depth];
}
|