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70791e56 | 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-bf1.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 | #if OPENSSL_VERSION_NUMBER < 0x00906000L | |
33 | #define SSH_OLD_EVP | |
34 | #endif | |
35 | ||
36 | /* | |
37 | * SSH1 uses a variation on Blowfish, all bytes must be swapped before | |
38 | * and after encryption/decryption. Thus the swap_bytes stuff (yuk). | |
39 | */ | |
40 | ||
41 | const EVP_CIPHER * evp_ssh1_bf(void); | |
42 | ||
43 | static void | |
44 | swap_bytes(const u_char *src, u_char *dst, int n) | |
45 | { | |
46 | u_char c[4]; | |
47 | ||
48 | /* Process 4 bytes every lap. */ | |
49 | for (n = n / 4; n > 0; n--) { | |
50 | c[3] = *src++; | |
51 | c[2] = *src++; | |
52 | c[1] = *src++; | |
53 | c[0] = *src++; | |
54 | ||
55 | *dst++ = c[0]; | |
56 | *dst++ = c[1]; | |
57 | *dst++ = c[2]; | |
58 | *dst++ = c[3]; | |
59 | } | |
60 | } | |
61 | ||
62 | #ifdef SSH_OLD_EVP | |
63 | static void bf_ssh1_init (EVP_CIPHER_CTX * ctx, const unsigned char *key, | |
64 | const unsigned char *iv, int enc) | |
65 | { | |
66 | if (iv != NULL) | |
67 | memcpy (&(ctx->oiv[0]), iv, 8); | |
68 | memcpy (&(ctx->iv[0]), &(ctx->oiv[0]), 8); | |
69 | if (key != NULL) | |
70 | BF_set_key (&(ctx->c.bf_ks), EVP_CIPHER_CTX_key_length (ctx), | |
71 | key); | |
72 | } | |
73 | #endif | |
74 | ||
75 | static int (*orig_bf)(EVP_CIPHER_CTX *, u_char *, const u_char *, u_int) = NULL; | |
76 | ||
77 | static int | |
78 | bf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in, u_int len) | |
79 | { | |
80 | int ret; | |
81 | ||
82 | swap_bytes(in, out, len); | |
83 | ret = (*orig_bf)(ctx, out, out, len); | |
84 | swap_bytes(out, out, len); | |
85 | return (ret); | |
86 | } | |
87 | ||
88 | const EVP_CIPHER * | |
89 | evp_ssh1_bf(void) | |
90 | { | |
91 | static EVP_CIPHER ssh1_bf; | |
92 | ||
93 | memcpy(&ssh1_bf, EVP_bf_cbc(), sizeof(EVP_CIPHER)); | |
94 | orig_bf = ssh1_bf.do_cipher; | |
95 | ssh1_bf.nid = NID_undef; | |
96 | #ifdef SSH_OLD_EVP | |
97 | ssh1_bf.init = bf_ssh1_init; | |
98 | #endif | |
99 | ssh1_bf.do_cipher = bf_ssh1_cipher; | |
100 | ssh1_bf.key_len = 32; | |
101 | return (&ssh1_bf); | |
102 | } |