Line data Source code
1 : /* crypto/rsa/rsa_ssl.c */
2 : /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 : * All rights reserved.
4 : *
5 : * This package is an SSL implementation written
6 : * by Eric Young (eay@cryptsoft.com).
7 : * The implementation was written so as to conform with Netscapes SSL.
8 : *
9 : * This library is free for commercial and non-commercial use as long as
10 : * the following conditions are aheared to. The following conditions
11 : * apply to all code found in this distribution, be it the RC4, RSA,
12 : * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 : * included with this distribution is covered by the same copyright terms
14 : * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 : *
16 : * Copyright remains Eric Young's, and as such any Copyright notices in
17 : * the code are not to be removed.
18 : * If this package is used in a product, Eric Young should be given attribution
19 : * as the author of the parts of the library used.
20 : * This can be in the form of a textual message at program startup or
21 : * in documentation (online or textual) provided with the package.
22 : *
23 : * Redistribution and use in source and binary forms, with or without
24 : * modification, are permitted provided that the following conditions
25 : * are met:
26 : * 1. Redistributions of source code must retain the copyright
27 : * notice, this list of conditions and the following disclaimer.
28 : * 2. Redistributions in binary form must reproduce the above copyright
29 : * notice, this list of conditions and the following disclaimer in the
30 : * documentation and/or other materials provided with the distribution.
31 : * 3. All advertising materials mentioning features or use of this software
32 : * must display the following acknowledgement:
33 : * "This product includes cryptographic software written by
34 : * Eric Young (eay@cryptsoft.com)"
35 : * The word 'cryptographic' can be left out if the rouines from the library
36 : * being used are not cryptographic related :-).
37 : * 4. If you include any Windows specific code (or a derivative thereof) from
38 : * the apps directory (application code) you must include an acknowledgement:
39 : * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 : *
41 : * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 : * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 : * SUCH DAMAGE.
52 : *
53 : * The licence and distribution terms for any publically available version or
54 : * derivative of this code cannot be changed. i.e. this code cannot simply be
55 : * copied and put under another distribution licence
56 : * [including the GNU Public Licence.]
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 :
65 0 : int RSA_padding_add_SSLv23(unsigned char *to, int tlen,
66 : const unsigned char *from, int flen)
67 : {
68 : int i, j;
69 : unsigned char *p;
70 :
71 0 : if (flen > (tlen - 11)) {
72 0 : RSAerr(RSA_F_RSA_PADDING_ADD_SSLV23,
73 : RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
74 0 : return (0);
75 : }
76 :
77 : p = (unsigned char *)to;
78 :
79 0 : *(p++) = 0;
80 0 : *(p++) = 2; /* Public Key BT (Block Type) */
81 :
82 : /* pad out with non-zero random data */
83 0 : j = tlen - 3 - 8 - flen;
84 :
85 0 : if (RAND_bytes(p, j) <= 0)
86 : return (0);
87 0 : for (i = 0; i < j; i++) {
88 0 : if (*p == '\0')
89 : do {
90 0 : if (RAND_bytes(p, 1) <= 0)
91 : return (0);
92 0 : } while (*p == '\0');
93 0 : p++;
94 : }
95 :
96 : memset(p, 3, 8);
97 : p += 8;
98 0 : *(p++) = '\0';
99 :
100 0 : memcpy(p, from, (unsigned int)flen);
101 0 : return (1);
102 : }
103 :
104 0 : int RSA_padding_check_SSLv23(unsigned char *to, int tlen,
105 : const unsigned char *from, int flen, int num)
106 : {
107 : int i, j, k;
108 : const unsigned char *p;
109 :
110 : p = from;
111 0 : if (flen < 10) {
112 0 : RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_DATA_TOO_SMALL);
113 0 : return (-1);
114 : }
115 0 : if ((num != (flen + 1)) || (*(p++) != 02)) {
116 0 : RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_BLOCK_TYPE_IS_NOT_02);
117 0 : return (-1);
118 : }
119 :
120 : /* scan over padding data */
121 0 : j = flen - 1; /* one for type */
122 0 : for (i = 0; i < j; i++)
123 0 : if (*(p++) == 0)
124 : break;
125 :
126 0 : if ((i == j) || (i < 8)) {
127 0 : RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23,
128 : RSA_R_NULL_BEFORE_BLOCK_MISSING);
129 0 : return (-1);
130 : }
131 0 : for (k = -9; k < -1; k++) {
132 0 : if (p[k] != 0x03)
133 : break;
134 : }
135 0 : if (k == -1) {
136 0 : RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_SSLV3_ROLLBACK_ATTACK);
137 0 : return (-1);
138 : }
139 :
140 0 : i++; /* Skip over the '\0' */
141 0 : j -= i;
142 0 : if (j > tlen) {
143 0 : RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_DATA_TOO_LARGE);
144 0 : return (-1);
145 : }
146 0 : memcpy(to, p, (unsigned int)j);
147 :
148 0 : return (j);
149 : }
|
