cipher.h revision 323134 
1/* $OpenBSD: cipher.h,v 1.49 2016/08/03 05:41:57 djm Exp $ */
2
3/*
4 * Author: Tatu Ylonen <ylo@cs.hut.fi>
5 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 *                    All rights reserved
7 *
8 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose.  Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
13 *
14 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 *    notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 *    notice, this list of conditions and the following disclaimer in the
23 *    documentation and/or other materials provided with the distribution.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#ifndef CIPHER_H
38#define CIPHER_H
39
40#include <sys/types.h>
41#include <openssl/evp.h>
42#include "cipher-chachapoly.h"
43#include "cipher-aesctr.h"
44
45/*
46 * Cipher types for SSH-1.  New types can be added, but old types should not
47 * be removed for compatibility.  The maximum allowed value is 31.
48 */
49#define SSH_CIPHER_SSH2		-3
50#define SSH_CIPHER_INVALID	-2	/* No valid cipher selected. */
51#define SSH_CIPHER_NOT_SET	-1	/* None selected (invalid number). */
52#define SSH_CIPHER_NONE		0	/* no encryption */
53#define SSH_CIPHER_IDEA		1	/* IDEA CFB */
54#define SSH_CIPHER_DES		2	/* DES CBC */
55#define SSH_CIPHER_3DES		3	/* 3DES CBC */
56#define SSH_CIPHER_BROKEN_TSS	4	/* TRI's Simple Stream encryption CBC */
57#define SSH_CIPHER_BROKEN_RC4	5	/* Alleged RC4 */
58#define SSH_CIPHER_BLOWFISH	6
59#define SSH_CIPHER_RESERVED	7
60#define SSH_CIPHER_MAX		31
61
62#define CIPHER_ENCRYPT		1
63#define CIPHER_DECRYPT		0
64
65struct sshcipher;
66struct sshcipher_ctx;
67
68u_int	 cipher_mask_ssh1(int);
69const struct sshcipher *cipher_by_name(const char *);
70const struct sshcipher *cipher_by_number(int);
71int	 cipher_number(const char *);
72char	*cipher_name(int);
73const char *cipher_warning_message(const struct sshcipher_ctx *);
74int	 ciphers_valid(const char *);
75char	*cipher_alg_list(char, int);
76int	 cipher_init(struct sshcipher_ctx **, const struct sshcipher *,
77    const u_char *, u_int, const u_char *, u_int, int);
78int	 cipher_crypt(struct sshcipher_ctx *, u_int, u_char *, const u_char *,
79    u_int, u_int, u_int);
80int	 cipher_get_length(struct sshcipher_ctx *, u_int *, u_int,
81    const u_char *, u_int);
82void	 cipher_free(struct sshcipher_ctx *);
83int	 cipher_set_key_string(struct sshcipher_ctx **,
84    const struct sshcipher *, const char *, int);
85u_int	 cipher_blocksize(const struct sshcipher *);
86u_int	 cipher_keylen(const struct sshcipher *);
87u_int	 cipher_seclen(const struct sshcipher *);
88u_int	 cipher_authlen(const struct sshcipher *);
89u_int	 cipher_ivlen(const struct sshcipher *);
90u_int	 cipher_is_cbc(const struct sshcipher *);
91
92u_int	 cipher_ctx_is_plaintext(struct sshcipher_ctx *);
93u_int	 cipher_ctx_get_number(struct sshcipher_ctx *);
94
95u_int	 cipher_get_number(const struct sshcipher *);
96int	 cipher_get_keyiv(struct sshcipher_ctx *, u_char *, u_int);
97int	 cipher_set_keyiv(struct sshcipher_ctx *, const u_char *);
98int	 cipher_get_keyiv_len(const struct sshcipher_ctx *);
99int	 cipher_get_keycontext(const struct sshcipher_ctx *, u_char *);
100void	 cipher_set_keycontext(struct sshcipher_ctx *, const u_char *);
101
102#endif				/* CIPHER_H */
103