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58964a49 RE |
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" | |
ec577822 BM |
61 | #include <openssl/bn.h> |
62 | #include <openssl/rsa.h> | |
63 | #include <openssl/rand.h> | |
58964a49 | 64 | |
29c1f061 RL |
65 | int RSA_padding_add_SSLv23(unsigned char *to, int tlen, |
66 | const unsigned char *from, int flen) | |
58964a49 RE |
67 | { |
68 | int i,j; | |
69 | unsigned char *p; | |
70 | ||
71 | if (flen > (tlen-11)) | |
72 | { | |
73 | RSAerr(RSA_F_RSA_PADDING_ADD_SSLV23,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); | |
74 | return(0); | |
75 | } | |
76 | ||
77 | p=(unsigned char *)to; | |
78 | ||
79 | *(p++)=0; | |
80 | *(p++)=2; /* Public Key BT (Block Type) */ | |
81 | ||
82 | /* pad out with non-zero random data */ | |
83 | j=tlen-3-8-flen; | |
84 | ||
eb952088 UM |
85 | if (RAND_bytes(p,j) <= 0) |
86 | return(0); | |
58964a49 RE |
87 | for (i=0; i<j; i++) |
88 | { | |
89 | if (*p == '\0') | |
90 | do { | |
eb952088 UM |
91 | if (RAND_bytes(p,1) <= 0) |
92 | return(0); | |
58964a49 RE |
93 | } while (*p == '\0'); |
94 | p++; | |
95 | } | |
96 | ||
97 | memset(p,3,8); | |
98 | p+=8; | |
99 | *(p++)='\0'; | |
100 | ||
101 | memcpy(p,from,(unsigned int)flen); | |
102 | return(1); | |
103 | } | |
104 | ||
29c1f061 RL |
105 | int RSA_padding_check_SSLv23(unsigned char *to, int tlen, |
106 | const unsigned char *from, int flen, int num) | |
58964a49 RE |
107 | { |
108 | int i,j,k; | |
29c1f061 | 109 | const unsigned char *p; |
58964a49 RE |
110 | |
111 | p=from; | |
112 | if (flen < 10) | |
113 | { | |
114 | RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23,RSA_R_DATA_TOO_SMALL); | |
115 | return(-1); | |
116 | } | |
dfeab068 | 117 | if ((num != (flen+1)) || (*(p++) != 02)) |
58964a49 RE |
118 | { |
119 | RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23,RSA_R_BLOCK_TYPE_IS_NOT_02); | |
120 | return(-1); | |
121 | } | |
122 | ||
123 | /* scan over padding data */ | |
124 | j=flen-1; /* one for type */ | |
125 | for (i=0; i<j; i++) | |
126 | if (*(p++) == 0) break; | |
127 | ||
128 | if ((i == j) || (i < 8)) | |
129 | { | |
130 | RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23,RSA_R_NULL_BEFORE_BLOCK_MISSING); | |
131 | return(-1); | |
132 | } | |
133 | for (k= -8; k<0; k++) | |
134 | { | |
135 | if (p[k] != 0x03) break; | |
136 | } | |
37569e64 | 137 | if (k == -1) |
58964a49 RE |
138 | { |
139 | RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23,RSA_R_SSLV3_ROLLBACK_ATTACK); | |
140 | return(-1); | |
141 | } | |
142 | ||
143 | i++; /* Skip over the '\0' */ | |
144 | j-=i; | |
17ef2916 UM |
145 | if (j > tlen) |
146 | { | |
147 | RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23,RSA_R_DATA_TOO_LARGE); | |
148 | return(-1); | |
149 | } | |
58964a49 RE |
150 | memcpy(to,p,(unsigned int)j); |
151 | ||
152 | return(j); | |
153 | } | |
154 |