cipher.h revision 1.5 
1/*	$NetBSD: cipher.h,v 1.5 2013/11/08 19:18:25 christos Exp $	*/
2/* $OpenBSD: cipher.h,v 1.40 2013/04/19 01:06:50 djm Exp $ */
3
4/*
5 * Author: Tatu Ylonen <ylo@cs.hut.fi>
6 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
7 *                    All rights reserved
8 *
9 * As far as I am concerned, the code I have written for this software
10 * can be used freely for any purpose.  Any derived versions of this
11 * software must be clearly marked as such, and if the derived work is
12 * incompatible with the protocol description in the RFC file, it must be
13 * called by a name other than "ssh" or "Secure Shell".
14 *
15 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 *    notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 *    notice, this list of conditions and the following disclaimer in the
24 *    documentation and/or other materials provided with the distribution.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#ifndef CIPHER_H
39#define CIPHER_H
40
41#include <openssl/evp.h>
42/*
43 * Cipher types for SSH-1.  New types can be added, but old types should not
44 * be removed for compatibility.  The maximum allowed value is 31.
45 */
46#define SSH_CIPHER_SSH2		-3
47#define SSH_CIPHER_INVALID	-2	/* No valid cipher selected. */
48#define SSH_CIPHER_NOT_SET	-1	/* None selected (invalid number). */
49#define SSH_CIPHER_NONE		0	/* no encryption */
50#define SSH_CIPHER_IDEA		1	/* IDEA CFB */
51#define SSH_CIPHER_DES		2	/* DES CBC */
52#define SSH_CIPHER_3DES		3	/* 3DES CBC */
53#define SSH_CIPHER_BROKEN_TSS	4	/* TRI's Simple Stream encryption CBC */
54#define SSH_CIPHER_BROKEN_RC4	5	/* Alleged RC4 */
55#define SSH_CIPHER_BLOWFISH	6
56#define SSH_CIPHER_RESERVED	7
57#define SSH_CIPHER_MAX		31
58
59#define CIPHER_ENCRYPT		1
60#define CIPHER_DECRYPT		0
61
62typedef struct Cipher Cipher;
63typedef struct CipherContext CipherContext;
64
65struct Cipher;
66struct CipherContext {
67	int	plaintext;
68	int	encrypt;
69	EVP_CIPHER_CTX evp;
70	const Cipher *cipher;
71};
72
73u_int	 cipher_mask_ssh1(int);
74const Cipher	*cipher_by_name(const char *);
75const Cipher	*cipher_by_number(int);
76int	 cipher_number(const char *);
77const char	*cipher_name(int);
78int	 ciphers_valid(const char *);
79char	*cipher_alg_list(void);
80void	 cipher_init(CipherContext *, const Cipher *, const u_char *, u_int,
81    const u_char *, u_int, int);
82void	 cipher_crypt(CipherContext *, u_char *, const u_char *,
83    u_int, u_int, u_int);
84void	 cipher_cleanup(CipherContext *);
85void	 cipher_set_key_string(CipherContext *, const Cipher *, const char *, int);
86u_int	 cipher_blocksize(const Cipher *);
87u_int	 cipher_keylen(const Cipher *);
88u_int	 cipher_authlen(const Cipher *);
89u_int	 cipher_ivlen(const Cipher *);
90u_int	 cipher_is_cbc(const Cipher *);
91
92u_int	 cipher_get_number(const Cipher *);
93void	 cipher_get_keyiv(CipherContext *, u_char *, u_int);
94void	 cipher_set_keyiv(CipherContext *, u_char *);
95int	 cipher_get_keyiv_len(const CipherContext *);
96int	 cipher_get_keycontext(const CipherContext *, u_char *);
97void	 cipher_set_keycontext(CipherContext *, u_char *);
98#endif				/* CIPHER_H */
99