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markus@openbsd.org60c2c4e2015-01-14 10:24:42 +00001/* $OpenBSD: cipher-bf1.c,v 1.7 2015/01/14 10:24:42 markus Exp $ */
Damien Miller3a3261f2003-05-15 13:37:19 +10002/*
3 * Copyright (c) 2003 Markus Friedl. All rights reserved.
4 *
markus@openbsd.org60c2c4e2015-01-14 10:24:42 +00005 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
Damien Miller3a3261f2003-05-15 13:37:19 +10008 *
9 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
10 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
11 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
12 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
13 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
14 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
15 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
16 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
17 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
18 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
19 */
20
21#include "includes.h"
Damien Miller3a3261f2003-05-15 13:37:19 +100022
Damien Miller832b7442016-07-15 14:45:34 +100023#if defined(WITH_OPENSSL) && !defined(OPENSSL_NO_BF)
Damien Miller72ef7c12015-01-15 02:21:31 +110024
Damien Millerd7834352006-08-05 12:39:39 +100025#include <sys/types.h>
26
Damien Millerded319c2006-09-01 15:38:36 +100027#include <stdarg.h>
Damien Millere3476ed2006-07-24 14:13:33 +100028#include <string.h>
29
markus@openbsd.org60c2c4e2015-01-14 10:24:42 +000030#include <openssl/evp.h>
Damien Miller5c3a5582003-09-23 22:12:38 +100031
Darren Tuckerda05f482007-03-13 18:50:04 +110032#include "openbsd-compat/openssl-compat.h"
Damien Miller5c3a5582003-09-23 22:12:38 +100033
Damien Miller3a3261f2003-05-15 13:37:19 +100034/*
35 * SSH1 uses a variation on Blowfish, all bytes must be swapped before
36 * and after encryption/decryption. Thus the swap_bytes stuff (yuk).
37 */
38
39const EVP_CIPHER * evp_ssh1_bf(void);
40
41static void
42swap_bytes(const u_char *src, u_char *dst, int n)
43{
44 u_char c[4];
45
46 /* Process 4 bytes every lap. */
47 for (n = n / 4; n > 0; n--) {
48 c[3] = *src++;
49 c[2] = *src++;
50 c[1] = *src++;
51 c[0] = *src++;
52
53 *dst++ = c[0];
54 *dst++ = c[1];
55 *dst++ = c[2];
56 *dst++ = c[3];
57 }
58}
59
60#ifdef SSH_OLD_EVP
61static void bf_ssh1_init (EVP_CIPHER_CTX * ctx, const unsigned char *key,
62 const unsigned char *iv, int enc)
63{
64 if (iv != NULL)
65 memcpy (&(ctx->oiv[0]), iv, 8);
66 memcpy (&(ctx->iv[0]), &(ctx->oiv[0]), 8);
67 if (key != NULL)
68 BF_set_key (&(ctx->c.bf_ks), EVP_CIPHER_CTX_key_length (ctx),
69 key);
70}
71#endif
72
Damien Miller9a3d0dc2010-10-07 22:06:42 +110073static int (*orig_bf)(EVP_CIPHER_CTX *, u_char *,
74 const u_char *, LIBCRYPTO_EVP_INL_TYPE) = NULL;
Damien Miller3a3261f2003-05-15 13:37:19 +100075
76static int
Damien Miller9a3d0dc2010-10-07 22:06:42 +110077bf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in,
78 LIBCRYPTO_EVP_INL_TYPE len)
Damien Miller3a3261f2003-05-15 13:37:19 +100079{
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
88const EVP_CIPHER *
89evp_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}
Damien Miller832b7442016-07-15 14:45:34 +1000103#endif /* defined(WITH_OPENSSL) && !defined(OPENSSL_NO_BF) */