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      1 /*	$OpenBSD: cipher.h,v 1.33 2002/03/18 17:13:15 markus Exp $	*/
      2 
      3 #ifndef	_CIPHER_H
      4 #define	_CIPHER_H
      5 
      6 #pragma ident	"%Z%%M%	%I%	%E% SMI"
      7 
      8 #ifdef __cplusplus
      9 extern "C" {
     10 #endif
     11 
     12 
     13 /*
     14  * Author: Tatu Ylonen <ylo (at) cs.hut.fi>
     15  * Copyright (c) 1995 Tatu Ylonen <ylo (at) cs.hut.fi>, Espoo, Finland
     16  *                    All rights reserved
     17  *
     18  * As far as I am concerned, the code I have written for this software
     19  * can be used freely for any purpose.  Any derived versions of this
     20  * software must be clearly marked as such, and if the derived work is
     21  * incompatible with the protocol description in the RFC file, it must be
     22  * called by a name other than "ssh" or "Secure Shell".
     23  *
     24  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
     25  *
     26  * Redistribution and use in source and binary forms, with or without
     27  * modification, are permitted provided that the following conditions
     28  * are met:
     29  * 1. Redistributions of source code must retain the above copyright
     30  *    notice, this list of conditions and the following disclaimer.
     31  * 2. Redistributions in binary form must reproduce the above copyright
     32  *    notice, this list of conditions and the following disclaimer in the
     33  *    documentation and/or other materials provided with the distribution.
     34  *
     35  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     36  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     37  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     38  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     39  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     40  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     41  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     42  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     43  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     44  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     45  */
     46 
     47 #include <openssl/evp.h>
     48 /*
     49  * Cipher types for SSH-1.  New types can be added, but old types should not
     50  * be removed for compatibility.  The maximum allowed value is 31.
     51  */
     52 #define SSH_CIPHER_SSH2		-3
     53 #define SSH_CIPHER_ILLEGAL	-2	/* No valid cipher selected. */
     54 #define SSH_CIPHER_NOT_SET	-1	/* None selected (invalid number). */
     55 #define SSH_CIPHER_NONE		0	/* no encryption */
     56 #define SSH_CIPHER_IDEA		1	/* IDEA CFB */
     57 #define SSH_CIPHER_DES		2	/* DES CBC */
     58 #define SSH_CIPHER_3DES		3	/* 3DES CBC */
     59 #define SSH_CIPHER_BROKEN_TSS	4	/* TRI's Simple Stream encryption CBC */
     60 #define SSH_CIPHER_BROKEN_RC4	5	/* Alleged RC4 */
     61 #define SSH_CIPHER_BLOWFISH	6
     62 #define SSH_CIPHER_RESERVED	7
     63 #define SSH_CIPHER_MAX		31
     64 
     65 #define CIPHER_ENCRYPT		1
     66 #define CIPHER_DECRYPT		0
     67 
     68 typedef struct Cipher Cipher;
     69 typedef struct CipherContext CipherContext;
     70 
     71 struct Cipher;
     72 struct CipherContext {
     73 	int	plaintext;
     74 	EVP_CIPHER_CTX evp;
     75 	Cipher *cipher;
     76 };
     77 
     78 u_int	 cipher_mask_ssh1(int);
     79 Cipher	*cipher_by_name(const char *);
     80 Cipher	*cipher_by_number(int);
     81 int	 cipher_number(const char *);
     82 char	*cipher_name(int);
     83 int	 ciphers_valid(const char *);
     84 void	 cipher_init(CipherContext *, Cipher *, const u_char *, u_int,
     85     const u_char *, u_int, int);
     86 void	 cipher_crypt(CipherContext *, u_char *, const u_char *, u_int);
     87 void	 cipher_cleanup(CipherContext *);
     88 void	 cipher_set_key_string(CipherContext *, Cipher *, const char *, int);
     89 u_int	 cipher_blocksize(Cipher *);
     90 u_int	 cipher_keylen(Cipher *);
     91 
     92 u_int	 cipher_get_number(Cipher *);
     93 void	 cipher_get_keyiv(CipherContext *, u_char *, u_int);
     94 void	 cipher_set_keyiv(CipherContext *, u_char *);
     95 int	 cipher_get_keyiv_len(CipherContext *);
     96 int	 cipher_get_keycontext(CipherContext *, u_char *);
     97 void	 cipher_set_keycontext(CipherContext *, u_char *);
     98 
     99 #ifdef __cplusplus
    100 }
    101 #endif
    102 
    103 #endif /* _CIPHER_H */
    104