1 /* $OpenBSD: cipher-bf1.c,v 1.7 2015/01/14 10:24:42 markus Exp $ */
3 * Copyright (c) 2003 Markus Friedl. All rights reserved.
5 * 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.
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.
23 #if defined(WITH_OPENSSL) && !defined(OPENSSL_NO_BF)
25 #include <sys/types.h>
30 #include <openssl/evp.h>
32 #include "openbsd-compat/openssl-compat.h"
35 * SSH1 uses a variation on Blowfish, all bytes must be swapped before
36 * and after encryption/decryption. Thus the swap_bytes stuff (yuk).
39 const EVP_CIPHER
* evp_ssh1_bf(void);
42 swap_bytes(const u_char
*src
, u_char
*dst
, int n
)
46 /* Process 4 bytes every lap. */
47 for (n
= n
/ 4; n
> 0; n
--) {
61 static void bf_ssh1_init (EVP_CIPHER_CTX
* ctx
, const unsigned char *key
,
62 const unsigned char *iv
, int enc
)
65 memcpy (&(ctx
->oiv
[0]), iv
, 8);
66 memcpy (&(ctx
->iv
[0]), &(ctx
->oiv
[0]), 8);
68 BF_set_key (&(ctx
->c
.bf_ks
), EVP_CIPHER_CTX_key_length (ctx
),
73 static int (*orig_bf
)(EVP_CIPHER_CTX
*, u_char
*,
74 const u_char
*, LIBCRYPTO_EVP_INL_TYPE
) = NULL
;
77 bf_ssh1_cipher(EVP_CIPHER_CTX
*ctx
, u_char
*out
, const u_char
*in
,
78 LIBCRYPTO_EVP_INL_TYPE len
)
82 swap_bytes(in
, out
, len
);
83 ret
= (*orig_bf
)(ctx
, out
, out
, len
);
84 swap_bytes(out
, out
, len
);
91 static EVP_CIPHER ssh1_bf
;
93 memcpy(&ssh1_bf
, EVP_bf_cbc(), sizeof(EVP_CIPHER
));
94 orig_bf
= ssh1_bf
.do_cipher
;
95 ssh1_bf
.nid
= NID_undef
;
97 ssh1_bf
.init
= bf_ssh1_init
;
99 ssh1_bf
.do_cipher
= bf_ssh1_cipher
;
100 ssh1_bf
.key_len
= 32;
103 #endif /* defined(WITH_OPENSSL) && !defined(OPENSSL_NO_BF) */