Annotation of src/usr.bin/ssh/cipher-bf1.c, Revision 1.1.14.1
1.1.14.1! brad 1: /* $OpenBSD: cipher-bf1.c,v 1.5 2006/08/03 03:34:42 deraadt Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2003 Markus Friedl. All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: *
14: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24: */
25:
1.1.14.1! brad 26: #include <sys/types.h>
1.1 markus 27:
28: #include <openssl/evp.h>
1.1.14.1! brad 29:
! 30: #include <string.h>
! 31:
1.1 markus 32: #include "xmalloc.h"
33: #include "log.h"
34: /*
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:
39: const EVP_CIPHER * evp_ssh1_bf(void);
40:
41: static void
42: swap_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: static int (*orig_bf)(EVP_CIPHER_CTX *, u_char *, const u_char *, u_int) = NULL;
61:
62: static int
63: bf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in, u_int len)
64: {
65: int ret;
66:
67: swap_bytes(in, out, len);
68: ret = (*orig_bf)(ctx, out, out, len);
69: swap_bytes(out, out, len);
70: return (ret);
71: }
72:
73: const EVP_CIPHER *
74: evp_ssh1_bf(void)
75: {
76: static EVP_CIPHER ssh1_bf;
77:
78: memcpy(&ssh1_bf, EVP_bf_cbc(), sizeof(EVP_CIPHER));
79: orig_bf = ssh1_bf.do_cipher;
80: ssh1_bf.nid = NID_undef;
81: ssh1_bf.do_cipher = bf_ssh1_cipher;
82: ssh1_bf.key_len = 32;
83: return (&ssh1_bf);
84: }