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58964a49 RE |
1 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
2 | * All rights reserved. | |
3 | * | |
4 | * This package is an SSL implementation written | |
5 | * by Eric Young (eay@cryptsoft.com). | |
6 | * The implementation was written so as to conform with Netscapes SSL. | |
0f113f3e | 7 | * |
58964a49 RE |
8 | * This library is free for commercial and non-commercial use as long as |
9 | * the following conditions are aheared to. The following conditions | |
10 | * apply to all code found in this distribution, be it the RC4, RSA, | |
11 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
12 | * included with this distribution is covered by the same copyright terms | |
13 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
0f113f3e | 14 | * |
58964a49 RE |
15 | * Copyright remains Eric Young's, and as such any Copyright notices in |
16 | * the code are not to be removed. | |
17 | * If this package is used in a product, Eric Young should be given attribution | |
18 | * as the author of the parts of the library used. | |
19 | * This can be in the form of a textual message at program startup or | |
20 | * in documentation (online or textual) provided with the package. | |
0f113f3e | 21 | * |
58964a49 RE |
22 | * Redistribution and use in source and binary forms, with or without |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
25 | * 1. Redistributions of source code must retain the copyright | |
26 | * notice, this list of conditions and the following disclaimer. | |
27 | * 2. Redistributions in binary form must reproduce the above copyright | |
28 | * notice, this list of conditions and the following disclaimer in the | |
29 | * documentation and/or other materials provided with the distribution. | |
30 | * 3. All advertising materials mentioning features or use of this software | |
31 | * must display the following acknowledgement: | |
32 | * "This product includes cryptographic software written by | |
33 | * Eric Young (eay@cryptsoft.com)" | |
34 | * The word 'cryptographic' can be left out if the rouines from the library | |
35 | * being used are not cryptographic related :-). | |
0f113f3e | 36 | * 4. If you include any Windows specific code (or a derivative thereof) from |
58964a49 RE |
37 | * the apps directory (application code) you must include an acknowledgement: |
38 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 39 | * |
58964a49 RE |
40 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
41 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
43 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
46 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
48 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
49 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
50 | * SUCH DAMAGE. | |
0f113f3e | 51 | * |
58964a49 RE |
52 | * The licence and distribution terms for any publically available version or |
53 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
54 | * copied and put under another distribution licence | |
55 | * [including the GNU Public Licence.] | |
56 | */ | |
57 | ||
58 | #include <stdio.h> | |
b39fc560 | 59 | #include "internal/cryptlib.h" |
ec577822 BM |
60 | #include <openssl/bn.h> |
61 | #include <openssl/rsa.h> | |
62 | #include <openssl/rand.h> | |
58964a49 | 63 | |
29c1f061 | 64 | int RSA_padding_add_SSLv23(unsigned char *to, int tlen, |
0f113f3e MC |
65 | const unsigned char *from, int flen) |
66 | { | |
67 | int i, j; | |
68 | unsigned char *p; | |
69 | ||
70 | if (flen > (tlen - 11)) { | |
71 | RSAerr(RSA_F_RSA_PADDING_ADD_SSLV23, | |
72 | RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); | |
73 | return (0); | |
74 | } | |
75 | ||
76 | p = (unsigned char *)to; | |
77 | ||
78 | *(p++) = 0; | |
79 | *(p++) = 2; /* Public Key BT (Block Type) */ | |
80 | ||
81 | /* pad out with non-zero random data */ | |
82 | j = tlen - 3 - 8 - flen; | |
83 | ||
84 | if (RAND_bytes(p, j) <= 0) | |
85 | return (0); | |
86 | for (i = 0; i < j; i++) { | |
87 | if (*p == '\0') | |
88 | do { | |
89 | if (RAND_bytes(p, 1) <= 0) | |
90 | return (0); | |
91 | } while (*p == '\0'); | |
92 | p++; | |
93 | } | |
94 | ||
95 | memset(p, 3, 8); | |
96 | p += 8; | |
97 | *(p++) = '\0'; | |
98 | ||
99 | memcpy(p, from, (unsigned int)flen); | |
100 | return (1); | |
101 | } | |
58964a49 | 102 | |
29c1f061 | 103 | int RSA_padding_check_SSLv23(unsigned char *to, int tlen, |
0f113f3e MC |
104 | const unsigned char *from, int flen, int num) |
105 | { | |
106 | int i, j, k; | |
107 | const unsigned char *p; | |
108 | ||
109 | p = from; | |
110 | if (flen < 10) { | |
111 | RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_DATA_TOO_SMALL); | |
112 | return (-1); | |
113 | } | |
114 | if ((num != (flen + 1)) || (*(p++) != 02)) { | |
115 | RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_BLOCK_TYPE_IS_NOT_02); | |
116 | return (-1); | |
117 | } | |
118 | ||
119 | /* scan over padding data */ | |
120 | j = flen - 1; /* one for type */ | |
121 | for (i = 0; i < j; i++) | |
122 | if (*(p++) == 0) | |
123 | break; | |
124 | ||
125 | if ((i == j) || (i < 8)) { | |
126 | RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, | |
127 | RSA_R_NULL_BEFORE_BLOCK_MISSING); | |
128 | return (-1); | |
129 | } | |
130 | for (k = -9; k < -1; k++) { | |
131 | if (p[k] != 0x03) | |
132 | break; | |
133 | } | |
134 | if (k == -1) { | |
135 | RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_SSLV3_ROLLBACK_ATTACK); | |
136 | return (-1); | |
137 | } | |
138 | ||
139 | i++; /* Skip over the '\0' */ | |
140 | j -= i; | |
141 | if (j > tlen) { | |
142 | RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_DATA_TOO_LARGE); | |
143 | return (-1); | |
144 | } | |
145 | memcpy(to, p, (unsigned int)j); | |
146 | ||
147 | return (j); | |
148 | } |