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