rdesktop/crypto/bn_ctx.c

/* 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).
 *
 */

#ifndef BN_CTX_DEBUG
# undef NDEBUG /* avoid conflicting definitions */
# define NDEBUG
#endif

#include <stdio.h>
#include <assert.h>
#include "bn.h"

BN_CTX *BN_CTX_new(void)
        {
        BN_CTX *ret;

        ret=(BN_CTX *)OPENSSL_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;
        ctx->too_many = 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)
                OPENSSL_free(ctx);
        }

void BN_CTX_start(BN_CTX *ctx)
        {
        if (ctx->depth < BN_CTX_NUM_POS)
                ctx->pos[ctx->depth] = ctx->tos;
        ctx->depth++;
        }

BIGNUM *BN_CTX_get(BN_CTX *ctx)
        {
        if (ctx->depth > BN_CTX_NUM_POS || ctx->tos >= BN_CTX_NUM)
                {
                if (!ctx->too_many)
                        {
                        BNerr(BN_F_BN_CTX_GET,BN_R_TOO_MANY_TEMPORARY_VARIABLES);
                        /* disable error code until BN_CTX_end is called: */
                        ctx->too_many = 1;
                        }
                return NULL;
                }
        return (&(ctx->bn[ctx->tos++]));
        }

void BN_CTX_end(BN_CTX *ctx)
        {
        if (ctx == NULL) return;
        assert(ctx->depth > 0);
        if (ctx->depth == 0)
                /* should never happen, but we can tolerate it if not in
                 * debug mode (could be a 'goto err' in the calling function
                 * before BN_CTX_start was reached) */
                BN_CTX_start(ctx);

        ctx->too_many = 0;
        ctx->depth--;
        if (ctx->depth < BN_CTX_NUM_POS)
                ctx->tos = ctx->pos[ctx->depth];
        }
1	matty	32	/* crypto/bn/bn_ctx.c */
2			/* Written by Ulf Moeller for the OpenSSL project. */
3			/* ====================================================================
4			* Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
5			*
6			* Redistribution and use in source and binary forms, with or without
7			* modification, are permitted provided that the following conditions
8			* are met:
9			*
10			* 1. Redistributions of source code must retain the above copyright
11			* notice, this list of conditions and the following disclaimer.
12			*
13			* 2. Redistributions in binary form must reproduce the above copyright
14			* notice, this list of conditions and the following disclaimer in
15			* the documentation and/or other materials provided with the
16			* distribution.
17			*
18			* 3. All advertising materials mentioning features or use of this
19			* software must display the following acknowledgment:
20			* "This product includes software developed by the OpenSSL Project
21			* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
22			*
23			* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
24			* endorse or promote products derived from this software without
25			* prior written permission. For written permission, please contact
26			* openssl-core@openssl.org.
27			*
28			* 5. Products derived from this software may not be called "OpenSSL"
29			* nor may "OpenSSL" appear in their names without prior written
30			* permission of the OpenSSL Project.
31			*
32			* 6. Redistributions of any form whatsoever must retain the following
33			* acknowledgment:
34			* "This product includes software developed by the OpenSSL Project
35			* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
36			*
37			* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
38			* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
39			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
40			* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
41			* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42			* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
43			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
44			* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
45			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
46			* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
47			* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
48			* OF THE POSSIBILITY OF SUCH DAMAGE.
49			* ====================================================================
50			*
51			* This product includes cryptographic software written by Eric Young
52			* (eay@cryptsoft.com). This product includes software written by Tim
53			* Hudson (tjh@cryptsoft.com).
54			*
55			*/
56
57			#ifndef BN_CTX_DEBUG
58			# undef NDEBUG /* avoid conflicting definitions */
59			# define NDEBUG
60			#endif
61
62			#include <stdio.h>
63			#include <assert.h>
64			#include "bn.h"
65
66			BN_CTX *BN_CTX_new(void)
67			{
68			BN_CTX *ret;
69
70			ret=(BN_CTX *)OPENSSL_malloc(sizeof(BN_CTX));
71			if (ret == NULL)
72			{
73			BNerr(BN_F_BN_CTX_NEW,ERR_R_MALLOC_FAILURE);
74			return(NULL);
75			}
76
77			BN_CTX_init(ret);
78			ret->flags=BN_FLG_MALLOCED;
79			return(ret);
80			}
81
82			void BN_CTX_init(BN_CTX *ctx)
83			{
84			int i;
85			ctx->tos = 0;
86			ctx->flags = 0;
87			ctx->depth = 0;
88			ctx->too_many = 0;
89			for (i = 0; i < BN_CTX_NUM; i++)
90			BN_init(&(ctx->bn[i]));
91			}
92
93			void BN_CTX_free(BN_CTX *ctx)
94			{
95			int i;
96
97			if (ctx == NULL) return;
98			assert(ctx->depth == 0);
99
100			for (i=0; i < BN_CTX_NUM; i++)
101			BN_clear_free(&(ctx->bn[i]));
102			if (ctx->flags & BN_FLG_MALLOCED)
103			OPENSSL_free(ctx);
104			}
105
106			void BN_CTX_start(BN_CTX *ctx)
107			{
108			if (ctx->depth < BN_CTX_NUM_POS)
109			ctx->pos[ctx->depth] = ctx->tos;
110			ctx->depth++;
111			}
112
113			BIGNUM BN_CTX_get(BN_CTX ctx)
114			{
115			if (ctx->depth > BN_CTX_NUM_POS \|\| ctx->tos >= BN_CTX_NUM)
116			{
117			if (!ctx->too_many)
118			{
119			BNerr(BN_F_BN_CTX_GET,BN_R_TOO_MANY_TEMPORARY_VARIABLES);
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
128			void 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			}