1 /* crypto/ec/ec_print.c */
2 /* ====================================================================
3 * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
31 * 6. Redistributions of any form whatsoever must retain the following
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * ====================================================================
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).
56 #include <openssl/crypto.h>
59 BIGNUM *EC_POINT_point2bn(const EC_GROUP *group,
60 const EC_POINT *point,
61 point_conversion_form_t form,
62 BIGNUM *ret, BN_CTX *ctx)
67 buf_len = EC_POINT_point2oct(group, point, form, NULL, 0, ctx);
71 if ((buf = OPENSSL_malloc(buf_len)) == NULL)
74 if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx)) {
79 ret = BN_bin2bn(buf, buf_len, ret);
86 EC_POINT *EC_POINT_bn2point(const EC_GROUP *group,
87 const BIGNUM *bn, EC_POINT *point, BN_CTX *ctx)
93 if ((buf_len = BN_num_bytes(bn)) == 0)
95 buf = OPENSSL_malloc(buf_len);
99 if (!BN_bn2bin(bn, buf)) {
105 if ((ret = EC_POINT_new(group)) == NULL) {
112 if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx)) {
114 EC_POINT_clear_free(ret);
123 static const char *HEX_DIGITS = "0123456789ABCDEF";
125 /* the return value must be freed (using OPENSSL_free()) */
126 char *EC_POINT_point2hex(const EC_GROUP *group,
127 const EC_POINT *point,
128 point_conversion_form_t form, BN_CTX *ctx)
131 size_t buf_len = 0, i;
132 unsigned char *buf, *pbuf;
134 buf_len = EC_POINT_point2oct(group, point, form, NULL, 0, ctx);
138 if ((buf = OPENSSL_malloc(buf_len)) == NULL)
141 if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx)) {
146 ret = (char *)OPENSSL_malloc(buf_len * 2 + 2);
153 for (i = buf_len; i > 0; i--) {
154 int v = (int)*(pbuf++);
155 *(p++) = HEX_DIGITS[v >> 4];
156 *(p++) = HEX_DIGITS[v & 0x0F];
165 EC_POINT *EC_POINT_hex2point(const EC_GROUP *group,
166 const char *buf, EC_POINT *point, BN_CTX *ctx)
168 EC_POINT *ret = NULL;
169 BIGNUM *tmp_bn = NULL;
171 if (!BN_hex2bn(&tmp_bn, buf))
174 ret = EC_POINT_bn2point(group, tmp_bn, point, ctx);
176 BN_clear_free(tmp_bn);