ec_print.c revision 160814
1160814Ssimon/* crypto/ec/ec_print.c */
2160814Ssimon/* ====================================================================
3160814Ssimon * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
4160814Ssimon *
5160814Ssimon * Redistribution and use in source and binary forms, with or without
6160814Ssimon * modification, are permitted provided that the following conditions
7160814Ssimon * are met:
8160814Ssimon *
9160814Ssimon * 1. Redistributions of source code must retain the above copyright
10160814Ssimon *    notice, this list of conditions and the following disclaimer.
11160814Ssimon *
12160814Ssimon * 2. Redistributions in binary form must reproduce the above copyright
13160814Ssimon *    notice, this list of conditions and the following disclaimer in
14160814Ssimon *    the documentation and/or other materials provided with the
15160814Ssimon *    distribution.
16160814Ssimon *
17160814Ssimon * 3. All advertising materials mentioning features or use of this
18160814Ssimon *    software must display the following acknowledgment:
19160814Ssimon *    "This product includes software developed by the OpenSSL Project
20160814Ssimon *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
21160814Ssimon *
22160814Ssimon * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23160814Ssimon *    endorse or promote products derived from this software without
24160814Ssimon *    prior written permission. For written permission, please contact
25160814Ssimon *    openssl-core@openssl.org.
26160814Ssimon *
27160814Ssimon * 5. Products derived from this software may not be called "OpenSSL"
28160814Ssimon *    nor may "OpenSSL" appear in their names without prior written
29160814Ssimon *    permission of the OpenSSL Project.
30160814Ssimon *
31160814Ssimon * 6. Redistributions of any form whatsoever must retain the following
32160814Ssimon *    acknowledgment:
33160814Ssimon *    "This product includes software developed by the OpenSSL Project
34160814Ssimon *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
35160814Ssimon *
36160814Ssimon * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37160814Ssimon * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38160814Ssimon * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39160814Ssimon * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
40160814Ssimon * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41160814Ssimon * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42160814Ssimon * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43160814Ssimon * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44160814Ssimon * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45160814Ssimon * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46160814Ssimon * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47160814Ssimon * OF THE POSSIBILITY OF SUCH DAMAGE.
48160814Ssimon * ====================================================================
49160814Ssimon *
50160814Ssimon * This product includes cryptographic software written by Eric Young
51160814Ssimon * (eay@cryptsoft.com).  This product includes software written by Tim
52160814Ssimon * Hudson (tjh@cryptsoft.com).
53160814Ssimon *
54160814Ssimon */
55160814Ssimon
56160814Ssimon#include <openssl/crypto.h>
57160814Ssimon#include "ec_lcl.h"
58160814Ssimon
59160814SsimonBIGNUM *EC_POINT_point2bn(const EC_GROUP *group,
60160814Ssimon                          const EC_POINT *point,
61160814Ssimon                          point_conversion_form_t form,
62160814Ssimon                          BIGNUM *ret,
63160814Ssimon                          BN_CTX *ctx)
64160814Ssimon	{
65160814Ssimon	size_t        buf_len=0;
66160814Ssimon	unsigned char *buf;
67160814Ssimon
68160814Ssimon	buf_len = EC_POINT_point2oct(group, point, form,
69160814Ssimon                                     NULL, 0, ctx);
70160814Ssimon	if (buf_len == 0)
71160814Ssimon		return NULL;
72160814Ssimon
73160814Ssimon	if ((buf = OPENSSL_malloc(buf_len)) == NULL)
74160814Ssimon		return NULL;
75160814Ssimon
76160814Ssimon	if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx))
77160814Ssimon		{
78160814Ssimon		OPENSSL_free(buf);
79160814Ssimon		return NULL;
80160814Ssimon		}
81160814Ssimon
82160814Ssimon	ret = BN_bin2bn(buf, buf_len, ret);
83160814Ssimon
84160814Ssimon	OPENSSL_free(buf);
85160814Ssimon
86160814Ssimon	return ret;
87160814Ssimon}
88160814Ssimon
89160814SsimonEC_POINT *EC_POINT_bn2point(const EC_GROUP *group,
90160814Ssimon                            const BIGNUM *bn,
91160814Ssimon                            EC_POINT *point,
92160814Ssimon                            BN_CTX *ctx)
93160814Ssimon	{
94160814Ssimon	size_t        buf_len=0;
95160814Ssimon	unsigned char *buf;
96160814Ssimon	EC_POINT      *ret;
97160814Ssimon
98160814Ssimon	if ((buf_len = BN_num_bytes(bn)) == 0) return NULL;
99160814Ssimon	buf = OPENSSL_malloc(buf_len);
100160814Ssimon	if (buf == NULL)
101160814Ssimon		return NULL;
102160814Ssimon
103160814Ssimon	if (!BN_bn2bin(bn, buf))
104160814Ssimon		{
105160814Ssimon		OPENSSL_free(buf);
106160814Ssimon		return NULL;
107160814Ssimon		}
108160814Ssimon
109160814Ssimon	if (point == NULL)
110160814Ssimon		{
111160814Ssimon		if ((ret = EC_POINT_new(group)) == NULL)
112160814Ssimon			{
113160814Ssimon			OPENSSL_free(buf);
114160814Ssimon			return NULL;
115160814Ssimon			}
116160814Ssimon		}
117160814Ssimon	else
118160814Ssimon		ret = point;
119160814Ssimon
120160814Ssimon	if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx))
121160814Ssimon		{
122160814Ssimon		if (point == NULL)
123160814Ssimon			EC_POINT_clear_free(ret);
124160814Ssimon		OPENSSL_free(buf);
125160814Ssimon		return NULL;
126160814Ssimon		}
127160814Ssimon
128160814Ssimon	OPENSSL_free(buf);
129160814Ssimon	return ret;
130160814Ssimon	}
131160814Ssimon
132160814Ssimonstatic const char *HEX_DIGITS = "0123456789ABCDEF";
133160814Ssimon
134160814Ssimon/* the return value must be freed (using OPENSSL_free()) */
135160814Ssimonchar *EC_POINT_point2hex(const EC_GROUP *group,
136160814Ssimon                         const EC_POINT *point,
137160814Ssimon                         point_conversion_form_t form,
138160814Ssimon                         BN_CTX *ctx)
139160814Ssimon	{
140160814Ssimon	char          *ret, *p;
141160814Ssimon	size_t        buf_len=0,i;
142160814Ssimon	unsigned char *buf, *pbuf;
143160814Ssimon
144160814Ssimon	buf_len = EC_POINT_point2oct(group, point, form,
145160814Ssimon                                     NULL, 0, ctx);
146160814Ssimon	if (buf_len == 0)
147160814Ssimon		return NULL;
148160814Ssimon
149160814Ssimon	if ((buf = OPENSSL_malloc(buf_len)) == NULL)
150160814Ssimon		return NULL;
151160814Ssimon
152160814Ssimon	if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx))
153160814Ssimon		{
154160814Ssimon		OPENSSL_free(buf);
155160814Ssimon		return NULL;
156160814Ssimon		}
157160814Ssimon
158160814Ssimon	ret = (char *)OPENSSL_malloc(buf_len*2+2);
159160814Ssimon	if (ret == NULL)
160160814Ssimon		{
161160814Ssimon		OPENSSL_free(buf);
162160814Ssimon		return NULL;
163160814Ssimon		}
164160814Ssimon	p = ret;
165160814Ssimon	pbuf = buf;
166160814Ssimon	for (i=buf_len; i > 0; i--)
167160814Ssimon		{
168160814Ssimon			int v = (int) *(pbuf++);
169160814Ssimon			*(p++)=HEX_DIGITS[v>>4];
170160814Ssimon			*(p++)=HEX_DIGITS[v&0x0F];
171160814Ssimon		}
172160814Ssimon	*p='\0';
173160814Ssimon
174160814Ssimon	OPENSSL_free(buf);
175160814Ssimon
176160814Ssimon	return ret;
177160814Ssimon	}
178160814Ssimon
179160814SsimonEC_POINT *EC_POINT_hex2point(const EC_GROUP *group,
180160814Ssimon                             const char *buf,
181160814Ssimon                             EC_POINT *point,
182160814Ssimon                             BN_CTX *ctx)
183160814Ssimon	{
184160814Ssimon	EC_POINT *ret=NULL;
185160814Ssimon	BIGNUM   *tmp_bn=NULL;
186160814Ssimon
187160814Ssimon	if (!BN_hex2bn(&tmp_bn, buf))
188160814Ssimon		return NULL;
189160814Ssimon
190160814Ssimon	ret = EC_POINT_bn2point(group, tmp_bn, point, ctx);
191160814Ssimon
192160814Ssimon	BN_clear_free(tmp_bn);
193160814Ssimon
194160814Ssimon	return ret;
195160814Ssimon	}
196