ttssh2/ttxssh/cipher.h

/*      $OpenBSD: cipher.h,v 1.34 2003/11/10 16:23:41 jakob Exp $       */

/*
 * 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.
 */

#ifndef CIPHER_H
#define CIPHER_H

#include <openssl/evp.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 CIPHER_ENCRYPT          1
#define CIPHER_DECRYPT          0

typedef struct Cipher Cipher;
typedef struct CipherContext CipherContext;

struct Cipher;
struct CipherContext {
        int     plaintext;
        EVP_CIPHER_CTX *evp;
        Cipher *cipher;
};

u_int    cipher_mask_ssh1(int);
Cipher  *cipher_by_name(const char *);
Cipher  *cipher_by_number(int);
int      cipher_number(const char *);
char    *cipher_name(int);
int      ciphers_valid(const char *);
void     cipher_init(CipherContext *, Cipher *, const u_char *, u_int,
    const u_char *, u_int, int);
void     cipher_crypt(CipherContext *, u_char *, const u_char *, u_int);
void     cipher_cleanup(CipherContext *);
void     cipher_set_key_string(CipherContext *, Cipher *, const char *, int);
u_int    cipher_blocksize(const Cipher *);
u_int    cipher_keylen(const Cipher *);

u_int    cipher_get_number(const Cipher *);
void     cipher_get_keyiv(CipherContext *, u_char *, u_int);
void     cipher_set_keyiv(CipherContext *, u_char *);
int      cipher_get_keyiv_len(const CipherContext *);
int      cipher_get_keycontext(const CipherContext *, u_char *);
void     cipher_set_keycontext(CipherContext *, u_char *);

void cipher_init_SSH2(
        EVP_CIPHER_CTX *evp,
        const u_char *key, u_int keylen,
        const u_char *iv, u_int ivlen,
        int encrypt,
        const EVP_CIPHER *type,
        int discard_len,
        unsigned int authlen,
        PTInstVar pvar
);

void cipher_free_SSH2(EVP_CIPHER_CTX *evp);

#endif                          /* CIPHER_H */