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rsa_x931.c
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1 /* rsa_x931.c */
2 /* Written by Dr Stephen N Henson ([email protected]) for the OpenSSL
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
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
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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  * ([email protected]). This product includes software written by Tim
55  * Hudson ([email protected]).
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  {
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  {
108  int i = 0,j;
109  const unsigned char *p;
110 
111  p=from;
112  if ((num != flen) || ((*p != 0x6A) && (*p != 0x6B)))
113  {
115  return -1;
116  }
117 
118  if (*p++ == 0x6B)
119  {
120  j=flen-3;
121  for (i = 0; i < j; i++)
122  {
123  unsigned char c = *p++;
124  if (c == 0xBA)
125  break;
126  if (c != 0xBB)
127  {
130  return -1;
131  }
132  }
133 
134  j -= i;
135 
136  if (i == 0)
137  {
139  return -1;
140  }
141 
142  }
143  else j = flen - 2;
144 
145  if (p[j] != 0xCC)
146  {
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 
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