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6cbe6382 BM |
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 | |
40720ce3 | 10 | * notice, this list of conditions and the following disclaimer. |
6cbe6382 BM |
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 | ||
40720ce3 MC |
59 | BIGNUM *EC_POINT_point2bn(const EC_GROUP *group, |
60 | const EC_POINT *point, | |
6cbe6382 | 61 | point_conversion_form_t form, |
40720ce3 MC |
62 | BIGNUM *ret, BN_CTX *ctx) |
63 | { | |
64 | size_t buf_len = 0; | |
65 | unsigned char *buf; | |
6cbe6382 | 66 | |
40720ce3 MC |
67 | buf_len = EC_POINT_point2oct(group, point, form, NULL, 0, ctx); |
68 | if (buf_len == 0) | |
69 | return NULL; | |
6cbe6382 | 70 | |
40720ce3 MC |
71 | if ((buf = OPENSSL_malloc(buf_len)) == NULL) |
72 | return NULL; | |
6cbe6382 | 73 | |
40720ce3 MC |
74 | if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx)) { |
75 | OPENSSL_free(buf); | |
76 | return NULL; | |
77 | } | |
6cbe6382 | 78 | |
40720ce3 | 79 | ret = BN_bin2bn(buf, buf_len, ret); |
6cbe6382 | 80 | |
40720ce3 | 81 | OPENSSL_free(buf); |
6cbe6382 | 82 | |
40720ce3 | 83 | return ret; |
6cbe6382 BM |
84 | } |
85 | ||
86 | EC_POINT *EC_POINT_bn2point(const EC_GROUP *group, | |
40720ce3 MC |
87 | const BIGNUM *bn, EC_POINT *point, BN_CTX *ctx) |
88 | { | |
89 | size_t buf_len = 0; | |
90 | unsigned char *buf; | |
91 | EC_POINT *ret; | |
92 | ||
93 | if ((buf_len = BN_num_bytes(bn)) == 0) | |
94 | return NULL; | |
95 | buf = OPENSSL_malloc(buf_len); | |
96 | if (buf == NULL) | |
97 | return NULL; | |
98 | ||
99 | if (!BN_bn2bin(bn, buf)) { | |
100 | OPENSSL_free(buf); | |
101 | return NULL; | |
102 | } | |
103 | ||
104 | if (point == NULL) { | |
105 | if ((ret = EC_POINT_new(group)) == NULL) { | |
106 | OPENSSL_free(buf); | |
107 | return NULL; | |
108 | } | |
109 | } else | |
110 | ret = point; | |
111 | ||
112 | if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx)) { | |
113 | if (point == NULL) | |
114 | EC_POINT_clear_free(ret); | |
115 | OPENSSL_free(buf); | |
116 | return NULL; | |
117 | } | |
118 | ||
119 | OPENSSL_free(buf); | |
120 | return ret; | |
121 | } | |
6cbe6382 BM |
122 | |
123 | static const char *HEX_DIGITS = "0123456789ABCDEF"; | |
124 | ||
125 | /* the return value must be freed (using OPENSSL_free()) */ | |
126 | char *EC_POINT_point2hex(const EC_GROUP *group, | |
127 | const EC_POINT *point, | |
40720ce3 MC |
128 | point_conversion_form_t form, BN_CTX *ctx) |
129 | { | |
130 | char *ret, *p; | |
131 | size_t buf_len = 0, i; | |
132 | unsigned char *buf, *pbuf; | |
133 | ||
134 | buf_len = EC_POINT_point2oct(group, point, form, NULL, 0, ctx); | |
135 | if (buf_len == 0) | |
136 | return NULL; | |
137 | ||
138 | if ((buf = OPENSSL_malloc(buf_len)) == NULL) | |
139 | return NULL; | |
140 | ||
141 | if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx)) { | |
142 | OPENSSL_free(buf); | |
143 | return NULL; | |
144 | } | |
145 | ||
146 | ret = (char *)OPENSSL_malloc(buf_len * 2 + 2); | |
147 | if (ret == NULL) { | |
148 | OPENSSL_free(buf); | |
149 | return NULL; | |
150 | } | |
151 | p = ret; | |
152 | pbuf = buf; | |
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]; | |
157 | } | |
158 | *p = '\0'; | |
159 | ||
160 | OPENSSL_free(buf); | |
161 | ||
162 | return ret; | |
163 | } | |
6cbe6382 BM |
164 | |
165 | EC_POINT *EC_POINT_hex2point(const EC_GROUP *group, | |
40720ce3 MC |
166 | const char *buf, EC_POINT *point, BN_CTX *ctx) |
167 | { | |
168 | EC_POINT *ret = NULL; | |
169 | BIGNUM *tmp_bn = NULL; | |
6cbe6382 | 170 | |
40720ce3 MC |
171 | if (!BN_hex2bn(&tmp_bn, buf)) |
172 | return NULL; | |
6cbe6382 | 173 | |
40720ce3 | 174 | ret = EC_POINT_bn2point(group, tmp_bn, point, ctx); |
6cbe6382 | 175 | |
40720ce3 | 176 | BN_clear_free(tmp_bn); |
6cbe6382 | 177 | |
40720ce3 MC |
178 | return ret; |
179 | } |