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/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
*
* As far as I am concerned, the code I have written for this software
* can be used freely for any purpose. Any derived versions of this
* software must be clearly marked as such, and if the derived work is
* incompatible with the protocol description in the RFC file, it must be
* called by a name other than "ssh" or "Secure Shell".
*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* RCSID("$OpenBSD: cipher.h,v 1.22 2000/10/13 18:59:14 markus Exp $"); */
#ifndef CIPHER_H
#define CIPHER_H
#include <openssl/des.h>
#include <openssl/blowfish.h>
#include <openssl/rc4.h>
#include <openssl/cast.h>
#include "rijndael.h"
/*
* Cipher types for SSH-1. New types can be added, but old types should not
* be removed for compatibility. The maximum allowed value is 31.
*/
#define SSH_CIPHER_SSH2 -3
#define SSH_CIPHER_ILLEGAL -2 /* No valid cipher selected. */
#define SSH_CIPHER_NOT_SET -1 /* None selected (invalid number). */
#define SSH_CIPHER_NONE 0 /* no encryption */
#define SSH_CIPHER_IDEA 1 /* IDEA CFB */
#define SSH_CIPHER_DES 2 /* DES CBC */
#define SSH_CIPHER_3DES 3 /* 3DES CBC */
#define SSH_CIPHER_BROKEN_TSS 4 /* TRI's Simple Stream encryption CBC */
#define SSH_CIPHER_BROKEN_RC4 5 /* Alleged RC4 */
#define SSH_CIPHER_BLOWFISH 6
#define SSH_CIPHER_RESERVED 7
#define SSH_CIPHER_MAX 31
typedef struct Cipher Cipher;
typedef struct CipherContext CipherContext;
struct CipherContext {
union {
struct {
des_key_schedule key;
des_cblock iv;
} des;
struct {
des_key_schedule key1;
des_key_schedule key2;
des_cblock iv2;
des_key_schedule key3;
des_cblock iv3;
} des3;
struct {
struct bf_key_st key;
u_char iv[8];
} bf;
struct {
CAST_KEY key;
u_char iv[8];
} cast;
struct {
u4byte iv[4];
rijndael_ctx enc;
rijndael_ctx dec;
} rijndael;
RC4_KEY rc4;
} u;
Cipher *cipher;
};
struct Cipher {
char *name;
int number; /* for ssh1 only */
u_int block_size;
u_int key_len;
void (*setkey)(CipherContext *, const u_char *, u_int);
void (*setiv)(CipherContext *, const u_char *, u_int);
void (*encrypt)(CipherContext *, u_char *, const u_char *, u_int);
void (*decrypt)(CipherContext *, u_char *, const u_char *, u_int);
};
unsigned int cipher_mask_ssh1(int client);
Cipher *cipher_by_name(const char *name);
Cipher *cipher_by_number(int id);
int cipher_number(const char *name);
char *cipher_name(int id);
int ciphers_valid(const char *names);
void cipher_init(CipherContext *, Cipher *, const u_char *, u_int, const u_char *, u_int);
void cipher_encrypt(CipherContext *context, u_char *dest, const u_char *src, u_int len);
void cipher_decrypt(CipherContext *context, u_char *dest, const u_char *src, u_int len);
void cipher_set_key_string(CipherContext *context, Cipher *cipher, const char *passphrase);
#endif /* CIPHER_H */
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