crypto/external/bsd/openssh/dist/cipher.h

   1 /*      $NetBSD$        */
   2 /* $OpenBSD: cipher.h,v 1.37 2009/01/26 09:58:15 markus 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
  62 typedef struct Cipher Cipher;
  63 typedef struct CipherContext CipherContext;
  64
  65 struct Cipher;
  66 struct CipherContext {
  67         int     plaintext;
  68         EVP_CIPHER_CTX evp;
  69         Cipher *cipher;
  70 };
  71
  72 u_int    cipher_mask_ssh1(int);
  73 Cipher  *cipher_by_name(const char *);
  74 Cipher  *cipher_by_number(int);
  75 int      cipher_number(const char *);
  76 char    *cipher_name(int);
  77 int      ciphers_valid(const char *);
  78 void     cipher_init(CipherContext *, Cipher *, const u_char *, u_int,
  79     const u_char *, u_int, int);
  80 void     cipher_crypt(CipherContext *, u_char *, const u_char *, u_int);
  81 void     cipher_cleanup(CipherContext *);
  82 void     cipher_set_key_string(CipherContext *, Cipher *, const char *, int);
  83 u_int    cipher_blocksize(const Cipher *);
  84 u_int    cipher_keylen(const Cipher *);
  85 u_int    cipher_is_cbc(const Cipher *);
  86
  87 u_int    cipher_get_number(const Cipher *);
  88 void     cipher_get_keyiv(CipherContext *, u_char *, u_int);
  89 void     cipher_set_keyiv(CipherContext *, u_char *);
  90 int      cipher_get_keyiv_len(const CipherContext *);
  91 int      cipher_get_keycontext(const CipherContext *, u_char *);
  92 void     cipher_set_keycontext(CipherContext *, u_char *);
  93 #endif                          /* CIPHER_H */