diff options
author | Colin Watson <cjwatson@debian.org> | 2003-09-23 18:08:35 +0000 |
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committer | Colin Watson <cjwatson@debian.org> | 2003-09-23 18:08:35 +0000 |
commit | d59fd3e421aa81b8e5e118f3f806081df2aca879 (patch) | |
tree | 356a4e607edc979c625bb33db63c656d771478bd /cipher-3des1.c | |
parent | 7505658c58e96b8d270f1928a0e1fa7f3e0c266b (diff) | |
parent | 45431c9b4677608680cd071768cbf156b316a7e8 (diff) |
Merge 3.7.1p2 to the trunk. I have absolutely no idea yet whether this will
work.
Diffstat (limited to 'cipher-3des1.c')
-rw-r--r-- | cipher-3des1.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/cipher-3des1.c b/cipher-3des1.c new file mode 100644 index 000000000..f9a352397 --- /dev/null +++ b/cipher-3des1.c | |||
@@ -0,0 +1,171 @@ | |||
1 | /* | ||
2 | * Copyright (c) 2003 Markus Friedl. All rights reserved. | ||
3 | * | ||
4 | * Redistribution and use in source and binary forms, with or without | ||
5 | * modification, are permitted provided that the following conditions | ||
6 | * are met: | ||
7 | * 1. Redistributions of source code must retain the above copyright | ||
8 | * notice, this list of conditions and the following disclaimer. | ||
9 | * 2. Redistributions in binary form must reproduce the above copyright | ||
10 | * notice, this list of conditions and the following disclaimer in the | ||
11 | * documentation and/or other materials provided with the distribution. | ||
12 | * | ||
13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | ||
14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | ||
15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | ||
16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | ||
18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | ||
22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
23 | */ | ||
24 | |||
25 | #include "includes.h" | ||
26 | RCSID("$OpenBSD: cipher-3des1.c,v 1.1 2003/05/15 03:08:29 markus Exp $"); | ||
27 | |||
28 | #include <openssl/evp.h> | ||
29 | #include "xmalloc.h" | ||
30 | #include "log.h" | ||
31 | |||
32 | /* | ||
33 | * This is used by SSH1: | ||
34 | * | ||
35 | * What kind of triple DES are these 2 routines? | ||
36 | * | ||
37 | * Why is there a redundant initialization vector? | ||
38 | * | ||
39 | * If only iv3 was used, then, this would till effect have been | ||
40 | * outer-cbc. However, there is also a private iv1 == iv2 which | ||
41 | * perhaps makes differential analysis easier. On the other hand, the | ||
42 | * private iv1 probably makes the CRC-32 attack ineffective. This is a | ||
43 | * result of that there is no longer any known iv1 to use when | ||
44 | * choosing the X block. | ||
45 | */ | ||
46 | struct ssh1_3des_ctx | ||
47 | { | ||
48 | EVP_CIPHER_CTX k1, k2, k3; | ||
49 | }; | ||
50 | |||
51 | const EVP_CIPHER * evp_ssh1_3des(void); | ||
52 | void ssh1_3des_iv(EVP_CIPHER_CTX *, int, u_char *, int); | ||
53 | |||
54 | static int | ||
55 | ssh1_3des_init(EVP_CIPHER_CTX *ctx, const u_char *key, const u_char *iv, | ||
56 | int enc) | ||
57 | { | ||
58 | struct ssh1_3des_ctx *c; | ||
59 | u_char *k1, *k2, *k3; | ||
60 | |||
61 | if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) { | ||
62 | c = xmalloc(sizeof(*c)); | ||
63 | EVP_CIPHER_CTX_set_app_data(ctx, c); | ||
64 | } | ||
65 | if (key == NULL) | ||
66 | return (1); | ||
67 | if (enc == -1) | ||
68 | enc = ctx->encrypt; | ||
69 | k1 = k2 = k3 = (u_char *) key; | ||
70 | k2 += 8; | ||
71 | if (EVP_CIPHER_CTX_key_length(ctx) >= 16+8) { | ||
72 | if (enc) | ||
73 | k3 += 16; | ||
74 | else | ||
75 | k1 += 16; | ||
76 | } | ||
77 | EVP_CIPHER_CTX_init(&c->k1); | ||
78 | EVP_CIPHER_CTX_init(&c->k2); | ||
79 | EVP_CIPHER_CTX_init(&c->k3); | ||
80 | #ifdef SSH_OLD_EVP | ||
81 | EVP_CipherInit(&c->k1, EVP_des_cbc(), k1, NULL, enc); | ||
82 | EVP_CipherInit(&c->k2, EVP_des_cbc(), k2, NULL, !enc); | ||
83 | EVP_CipherInit(&c->k3, EVP_des_cbc(), k3, NULL, enc); | ||
84 | #else | ||
85 | if (EVP_CipherInit(&c->k1, EVP_des_cbc(), k1, NULL, enc) == 0 || | ||
86 | EVP_CipherInit(&c->k2, EVP_des_cbc(), k2, NULL, !enc) == 0 || | ||
87 | EVP_CipherInit(&c->k3, EVP_des_cbc(), k3, NULL, enc) == 0) { | ||
88 | memset(c, 0, sizeof(*c)); | ||
89 | xfree(c); | ||
90 | EVP_CIPHER_CTX_set_app_data(ctx, NULL); | ||
91 | return (0); | ||
92 | } | ||
93 | #endif | ||
94 | return (1); | ||
95 | } | ||
96 | |||
97 | static int | ||
98 | ssh1_3des_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src, u_int len) | ||
99 | { | ||
100 | struct ssh1_3des_ctx *c; | ||
101 | |||
102 | if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) { | ||
103 | error("ssh1_3des_cbc: no context"); | ||
104 | return (0); | ||
105 | } | ||
106 | #ifdef SSH_OLD_EVP | ||
107 | EVP_Cipher(&c->k1, dest, (u_char *)src, len); | ||
108 | EVP_Cipher(&c->k2, dest, dest, len); | ||
109 | EVP_Cipher(&c->k3, dest, dest, len); | ||
110 | #else | ||
111 | if (EVP_Cipher(&c->k1, dest, (u_char *)src, len) == 0 || | ||
112 | EVP_Cipher(&c->k2, dest, dest, len) == 0 || | ||
113 | EVP_Cipher(&c->k3, dest, dest, len) == 0) | ||
114 | return (0); | ||
115 | #endif | ||
116 | return (1); | ||
117 | } | ||
118 | |||
119 | static int | ||
120 | ssh1_3des_cleanup(EVP_CIPHER_CTX *ctx) | ||
121 | { | ||
122 | struct ssh1_3des_ctx *c; | ||
123 | |||
124 | if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) { | ||
125 | memset(c, 0, sizeof(*c)); | ||
126 | xfree(c); | ||
127 | EVP_CIPHER_CTX_set_app_data(ctx, NULL); | ||
128 | } | ||
129 | return (1); | ||
130 | } | ||
131 | |||
132 | void | ||
133 | ssh1_3des_iv(EVP_CIPHER_CTX *evp, int doset, u_char *iv, int len) | ||
134 | { | ||
135 | struct ssh1_3des_ctx *c; | ||
136 | |||
137 | if (len != 24) | ||
138 | fatal("%s: bad 3des iv length: %d", __func__, len); | ||
139 | if ((c = EVP_CIPHER_CTX_get_app_data(evp)) == NULL) | ||
140 | fatal("%s: no 3des context", __func__); | ||
141 | if (doset) { | ||
142 | debug3("%s: Installed 3DES IV", __func__); | ||
143 | memcpy(c->k1.iv, iv, 8); | ||
144 | memcpy(c->k2.iv, iv + 8, 8); | ||
145 | memcpy(c->k3.iv, iv + 16, 8); | ||
146 | } else { | ||
147 | debug3("%s: Copying 3DES IV", __func__); | ||
148 | memcpy(iv, c->k1.iv, 8); | ||
149 | memcpy(iv + 8, c->k2.iv, 8); | ||
150 | memcpy(iv + 16, c->k3.iv, 8); | ||
151 | } | ||
152 | } | ||
153 | |||
154 | const EVP_CIPHER * | ||
155 | evp_ssh1_3des(void) | ||
156 | { | ||
157 | static EVP_CIPHER ssh1_3des; | ||
158 | |||
159 | memset(&ssh1_3des, 0, sizeof(EVP_CIPHER)); | ||
160 | ssh1_3des.nid = NID_undef; | ||
161 | ssh1_3des.block_size = 8; | ||
162 | ssh1_3des.iv_len = 0; | ||
163 | ssh1_3des.key_len = 16; | ||
164 | ssh1_3des.init = ssh1_3des_init; | ||
165 | ssh1_3des.cleanup = ssh1_3des_cleanup; | ||
166 | ssh1_3des.do_cipher = ssh1_3des_cbc; | ||
167 | #ifndef SSH_OLD_EVP | ||
168 | ssh1_3des.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH; | ||
169 | #endif | ||
170 | return (&ssh1_3des); | ||
171 | } | ||