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429168e7 | 1 | /* rsa_x931.c */ |
2e597528 | 2 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
429168e7 DSH |
3 | * project 2005. |
4 | */ | |
5 | /* ==================================================================== | |
6 | * Copyright (c) 2005 The OpenSSL Project. All rights reserved. | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in | |
17 | * the documentation and/or other materials provided with the | |
18 | * distribution. | |
19 | * | |
20 | * 3. All advertising materials mentioning features or use of this | |
21 | * software must display the following acknowledgment: | |
22 | * "This product includes software developed by the OpenSSL Project | |
23 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
24 | * | |
25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
26 | * endorse or promote products derived from this software without | |
27 | * prior written permission. For written permission, please contact | |
28 | * licensing@OpenSSL.org. | |
29 | * | |
30 | * 5. Products derived from this software may not be called "OpenSSL" | |
31 | * nor may "OpenSSL" appear in their names without prior written | |
32 | * permission of the OpenSSL Project. | |
33 | * | |
34 | * 6. Redistributions of any form whatsoever must retain the following | |
35 | * acknowledgment: | |
36 | * "This product includes software developed by the OpenSSL Project | |
37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
38 | * | |
39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
50 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
51 | * ==================================================================== | |
52 | * | |
53 | * This product includes cryptographic software written by Eric Young | |
54 | * (eay@cryptsoft.com). This product includes software written by Tim | |
55 | * Hudson (tjh@cryptsoft.com). | |
56 | * | |
57 | */ | |
58 | ||
59 | #include <stdio.h> | |
60 | #include "cryptlib.h" | |
61 | #include <openssl/bn.h> | |
62 | #include <openssl/rsa.h> | |
63 | #include <openssl/rand.h> | |
64 | #include <openssl/objects.h> | |
65 | ||
66 | int RSA_padding_add_X931(unsigned char *to, int tlen, | |
67 | const unsigned char *from, int flen) | |
68 | { | |
69 | int j; | |
70 | unsigned char *p; | |
71 | ||
72 | /* Absolute minimum amount of padding is 1 header nibble, 1 padding | |
73 | * nibble and 2 trailer bytes: but 1 hash if is already in 'from'. | |
74 | */ | |
75 | ||
76 | j = tlen - flen - 2; | |
77 | ||
78 | if (j < 0) | |
79 | { | |
80 | RSAerr(RSA_F_RSA_PADDING_ADD_X931,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); | |
81 | return -1; | |
82 | } | |
83 | ||
84 | p=(unsigned char *)to; | |
85 | ||
86 | /* If no padding start and end nibbles are in one byte */ | |
87 | if (j == 0) | |
88 | *p++ = 0x6A; | |
89 | else | |
90 | { | |
91 | *p++ = 0x6B; | |
92 | if (j > 1) | |
93 | { | |
94 | memset(p, 0xBB, j - 1); | |
95 | p += j - 1; | |
96 | } | |
97 | *p++ = 0xBA; | |
98 | } | |
99 | memcpy(p,from,(unsigned int)flen); | |
100 | p += flen; | |
101 | *p = 0xCC; | |
102 | return(1); | |
103 | } | |
104 | ||
105 | int RSA_padding_check_X931(unsigned char *to, int tlen, | |
106 | const unsigned char *from, int flen, int num) | |
107 | { | |
63d74075 | 108 | int i = 0,j; |
429168e7 DSH |
109 | const unsigned char *p; |
110 | ||
111 | p=from; | |
112 | if ((num != flen) || ((*p != 0x6A) && (*p != 0x6B))) | |
113 | { | |
114 | RSAerr(RSA_F_RSA_PADDING_CHECK_X931,RSA_R_INVALID_HEADER); | |
115 | return -1; | |
116 | } | |
117 | ||
429168e7 DSH |
118 | if (*p++ == 0x6B) |
119 | { | |
a78c0632 | 120 | j=flen-3; |
429168e7 DSH |
121 | for (i = 0; i < j; i++) |
122 | { | |
123 | unsigned char c = *p++; | |
124 | if (c == 0xBA) | |
125 | break; | |
126 | if (c != 0xBB) | |
127 | { | |
128 | RSAerr(RSA_F_RSA_PADDING_CHECK_X931, | |
129 | RSA_R_INVALID_PADDING); | |
130 | return -1; | |
131 | } | |
132 | } | |
429168e7 | 133 | |
a78c0632 DSH |
134 | j -= i; |
135 | ||
136 | if (i == 0) | |
137 | { | |
138 | RSAerr(RSA_F_RSA_PADDING_CHECK_X931, RSA_R_INVALID_PADDING); | |
139 | return -1; | |
140 | } | |
429168e7 | 141 | |
429168e7 | 142 | } |
a78c0632 | 143 | else j = flen - 2; |
429168e7 DSH |
144 | |
145 | if (p[j] != 0xCC) | |
146 | { | |
147 | RSAerr(RSA_F_RSA_PADDING_CHECK_X931, RSA_R_INVALID_TRAILER); | |
148 | return -1; | |
149 | } | |
150 | ||
151 | memcpy(to,p,(unsigned int)j); | |
152 | ||
153 | return(j); | |
154 | } | |
155 | ||
156 | /* Translate between X931 hash ids and NIDs */ | |
157 | ||
158 | int RSA_X931_hash_id(int nid) | |
159 | { | |
160 | switch (nid) | |
161 | { | |
162 | case NID_sha1: | |
163 | return 0x33; | |
164 | ||
165 | case NID_sha256: | |
166 | return 0x34; | |
167 | ||
168 | case NID_sha384: | |
169 | return 0x36; | |
170 | ||
171 | case NID_sha512: | |
172 | return 0x35; | |
173 | ||
174 | } | |
175 | return -1; | |
176 | } | |
177 |