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	/* 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	}