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3b6e3da9 | 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" | |
3b6e3da9 | 26 | |
27 | #include <openssl/evp.h> | |
28 | #include "xmalloc.h" | |
29 | #include "log.h" | |
0a23d79f | 30 | |
31 | #if OPENSSL_VERSION_NUMBER < 0x00906000L | |
32 | #define SSH_OLD_EVP | |
33 | #endif | |
34 | ||
3b6e3da9 | 35 | /* |
36 | * SSH1 uses a variation on Blowfish, all bytes must be swapped before | |
37 | * and after encryption/decryption. Thus the swap_bytes stuff (yuk). | |
38 | */ | |
39 | ||
40 | const EVP_CIPHER * evp_ssh1_bf(void); | |
41 | ||
42 | static void | |
43 | swap_bytes(const u_char *src, u_char *dst, int n) | |
44 | { | |
45 | u_char c[4]; | |
46 | ||
47 | /* Process 4 bytes every lap. */ | |
48 | for (n = n / 4; n > 0; n--) { | |
49 | c[3] = *src++; | |
50 | c[2] = *src++; | |
51 | c[1] = *src++; | |
52 | c[0] = *src++; | |
53 | ||
54 | *dst++ = c[0]; | |
55 | *dst++ = c[1]; | |
56 | *dst++ = c[2]; | |
57 | *dst++ = c[3]; | |
58 | } | |
59 | } | |
60 | ||
61 | #ifdef SSH_OLD_EVP | |
62 | static void bf_ssh1_init (EVP_CIPHER_CTX * ctx, const unsigned char *key, | |
63 | const unsigned char *iv, int enc) | |
64 | { | |
65 | if (iv != NULL) | |
66 | memcpy (&(ctx->oiv[0]), iv, 8); | |
67 | memcpy (&(ctx->iv[0]), &(ctx->oiv[0]), 8); | |
68 | if (key != NULL) | |
69 | BF_set_key (&(ctx->c.bf_ks), EVP_CIPHER_CTX_key_length (ctx), | |
70 | key); | |
71 | } | |
72 | #endif | |
73 | ||
74 | static int (*orig_bf)(EVP_CIPHER_CTX *, u_char *, const u_char *, u_int) = NULL; | |
75 | ||
76 | static int | |
77 | bf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in, u_int len) | |
78 | { | |
79 | int ret; | |
80 | ||
81 | swap_bytes(in, out, len); | |
82 | ret = (*orig_bf)(ctx, out, out, len); | |
83 | swap_bytes(out, out, len); | |
84 | return (ret); | |
85 | } | |
86 | ||
87 | const EVP_CIPHER * | |
88 | evp_ssh1_bf(void) | |
89 | { | |
90 | static EVP_CIPHER ssh1_bf; | |
91 | ||
92 | memcpy(&ssh1_bf, EVP_bf_cbc(), sizeof(EVP_CIPHER)); | |
93 | orig_bf = ssh1_bf.do_cipher; | |
94 | ssh1_bf.nid = NID_undef; | |
95 | #ifdef SSH_OLD_EVP | |
96 | ssh1_bf.init = bf_ssh1_init; | |
97 | #endif | |
98 | ssh1_bf.do_cipher = bf_ssh1_cipher; | |
99 | ssh1_bf.key_len = 32; | |
100 | return (&ssh1_bf); | |
101 | } |