2 * Copyright (c) 2003 Markus Friedl. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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.
26 RCSID("$OpenBSD: cipher-bf1.c,v 1.1 2003/05/15 03:08:29 markus Exp $");
28 #include <openssl/evp.h>
32 * SSH1 uses a variation on Blowfish, all bytes must be swapped before
33 * and after encryption/decryption. Thus the swap_bytes stuff (yuk).
36 const EVP_CIPHER * evp_ssh1_bf(void);
39 swap_bytes(const u_char *src, u_char *dst, int n)
43 /* Process 4 bytes every lap. */
44 for (n = n / 4; n > 0; n--) {
58 static void bf_ssh1_init (EVP_CIPHER_CTX * ctx, const unsigned char *key,
59 const unsigned char *iv, int enc)
62 memcpy (&(ctx->oiv[0]), iv, 8);
63 memcpy (&(ctx->iv[0]), &(ctx->oiv[0]), 8);
65 BF_set_key (&(ctx->c.bf_ks), EVP_CIPHER_CTX_key_length (ctx),
70 static int (*orig_bf)(EVP_CIPHER_CTX *, u_char *, const u_char *, u_int) = NULL;
73 bf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in, u_int len)
77 swap_bytes(in, out, len);
78 ret = (*orig_bf)(ctx, out, out, len);
79 swap_bytes(out, out, len);
86 static EVP_CIPHER ssh1_bf;
88 memcpy(&ssh1_bf, EVP_bf_cbc(), sizeof(EVP_CIPHER));
89 orig_bf = ssh1_bf.do_cipher;
90 ssh1_bf.nid = NID_undef;
92 ssh1_bf.init = bf_ssh1_init;
94 ssh1_bf.do_cipher = bf_ssh1_cipher;