ec_print.c revision 656d9c7f52f88b3a3daccafa7655dec086c4756e 
1/* crypto/ec/ec_print.c */
2/* ====================================================================
3 * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in
14 *    the documentation and/or other materials provided with the
15 *    distribution.
16 *
17 * 3. All advertising materials mentioning features or use of this
18 *    software must display the following acknowledgment:
19 *    "This product includes software developed by the OpenSSL Project
20 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
21 *
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23 *    endorse or promote products derived from this software without
24 *    prior written permission. For written permission, please contact
25 *    openssl-core@openssl.org.
26 *
27 * 5. Products derived from this software may not be called "OpenSSL"
28 *    nor may "OpenSSL" appear in their names without prior written
29 *    permission of the OpenSSL Project.
30 *
31 * 6. Redistributions of any form whatsoever must retain the following
32 *    acknowledgment:
33 *    "This product includes software developed by the OpenSSL Project
34 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
49 *
50 * This product includes cryptographic software written by Eric Young
51 * (eay@cryptsoft.com).  This product includes software written by Tim
52 * Hudson (tjh@cryptsoft.com).
53 *
54 */
55
56#include <openssl/crypto.h>
57#include "ec_lcl.h"
58
59BIGNUM *EC_POINT_point2bn(const EC_GROUP *group,
60                          const EC_POINT *point,
61                          point_conversion_form_t form,
62                          BIGNUM *ret,
63                          BN_CTX *ctx)
64	{
65	size_t        buf_len=0;
66	unsigned char *buf;
67
68	buf_len = EC_POINT_point2oct(group, point, form,
69                                     NULL, 0, ctx);
70	if (buf_len == 0)
71		return NULL;
72
73	if ((buf = OPENSSL_malloc(buf_len)) == NULL)
74		return NULL;
75
76	if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx))
77		{
78		OPENSSL_free(buf);
79		return NULL;
80		}
81
82	ret = BN_bin2bn(buf, buf_len, ret);
83
84	OPENSSL_free(buf);
85
86	return ret;
87}
88
89EC_POINT *EC_POINT_bn2point(const EC_GROUP *group,
90                            const BIGNUM *bn,
91                            EC_POINT *point,
92                            BN_CTX *ctx)
93	{
94	size_t        buf_len=0;
95	unsigned char *buf;
96	EC_POINT      *ret;
97
98	if ((buf_len = BN_num_bytes(bn)) == 0) return NULL;
99	buf = OPENSSL_malloc(buf_len);
100	if (buf == NULL)
101		return NULL;
102
103	if (!BN_bn2bin(bn, buf))
104		{
105		OPENSSL_free(buf);
106		return NULL;
107		}
108
109	if (point == NULL)
110		{
111		if ((ret = EC_POINT_new(group)) == NULL)
112			{
113			OPENSSL_free(buf);
114			return NULL;
115			}
116		}
117	else
118		ret = point;
119
120	if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx))
121		{
122		if (point == NULL)
123			EC_POINT_clear_free(ret);
124		OPENSSL_free(buf);
125		return NULL;
126		}
127
128	OPENSSL_free(buf);
129	return ret;
130	}
131
132static const char *HEX_DIGITS = "0123456789ABCDEF";
133
134/* the return value must be freed (using OPENSSL_free()) */
135char *EC_POINT_point2hex(const EC_GROUP *group,
136                         const EC_POINT *point,
137                         point_conversion_form_t form,
138                         BN_CTX *ctx)
139	{
140	char          *ret, *p;
141	size_t        buf_len=0,i;
142	unsigned char *buf, *pbuf;
143
144	buf_len = EC_POINT_point2oct(group, point, form,
145                                     NULL, 0, ctx);
146	if (buf_len == 0)
147		return NULL;
148
149	if ((buf = OPENSSL_malloc(buf_len)) == NULL)
150		return NULL;
151
152	if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx))
153		{
154		OPENSSL_free(buf);
155		return NULL;
156		}
157
158	ret = (char *)OPENSSL_malloc(buf_len*2+2);
159	if (ret == NULL)
160		{
161		OPENSSL_free(buf);
162		return NULL;
163		}
164	p = ret;
165	pbuf = buf;
166	for (i=buf_len; i > 0; i--)
167		{
168			int v = (int) *(pbuf++);
169			*(p++)=HEX_DIGITS[v>>4];
170			*(p++)=HEX_DIGITS[v&0x0F];
171		}
172	*p='\0';
173
174	OPENSSL_free(buf);
175
176	return ret;
177	}
178
179EC_POINT *EC_POINT_hex2point(const EC_GROUP *group,
180                             const char *buf,
181                             EC_POINT *point,
182                             BN_CTX *ctx)
183	{
184	EC_POINT *ret=NULL;
185	BIGNUM   *tmp_bn=NULL;
186
187	if (!BN_hex2bn(&tmp_bn, buf))
188		return NULL;
189
190	ret = EC_POINT_bn2point(group, tmp_bn, point, ctx);
191
192	BN_clear_free(tmp_bn);
193
194	return ret;
195	}
196