1 /* $OpenBSD: cipher.h,v 1.37 2009/01/26 09:58:15 markus 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 <openssl/evp.h> 41 /* 42 * Cipher types for SSH-1. New types can be added, but old types should not 43 * be removed for compatibility. The maximum allowed value is 31. 44 */ 45 #define SSH_CIPHER_SSH2 -3 46 #define SSH_CIPHER_INVALID -2 /* No valid cipher selected. */ 47 #define SSH_CIPHER_NOT_SET -1 /* None selected (invalid number). */ 48 #define SSH_CIPHER_NONE 0 /* no encryption */ 49 #define SSH_CIPHER_IDEA 1 /* IDEA CFB */ 50 #define SSH_CIPHER_DES 2 /* DES CBC */ 51 #define SSH_CIPHER_3DES 3 /* 3DES CBC */ 52 #define SSH_CIPHER_BROKEN_TSS 4 /* TRI's Simple Stream encryption CBC */ 53 #define SSH_CIPHER_BROKEN_RC4 5 /* Alleged RC4 */ 54 #define SSH_CIPHER_BLOWFISH 6 55 #define SSH_CIPHER_RESERVED 7 56 #define SSH_CIPHER_MAX 31 57 58 #define CIPHER_ENCRYPT 1 59 #define CIPHER_DECRYPT 0 60 61 typedef struct Cipher Cipher; 62 typedef struct CipherContext CipherContext; 63 64 struct Cipher; 65 struct CipherContext { 66 int plaintext; 67 EVP_CIPHER_CTX evp; 68 Cipher *cipher; 69 }; 70 71 u_int cipher_mask_ssh1(int); 72 Cipher *cipher_by_name(const char *); 73 Cipher *cipher_by_number(int); 74 int cipher_number(const char *); 75 char *cipher_name(int); 76 int ciphers_valid(const char *); 77 void cipher_init(CipherContext *, Cipher *, const u_char *, u_int, 78 const u_char *, u_int, int); 79 void cipher_crypt(CipherContext *, u_char *, const u_char *, u_int); 80 void cipher_cleanup(CipherContext *); 81 void cipher_set_key_string(CipherContext *, Cipher *, const char *, int); 82 u_int cipher_blocksize(const Cipher *); 83 u_int cipher_keylen(const Cipher *); 84 u_int cipher_is_cbc(const Cipher *); 85 86 u_int cipher_get_number(const Cipher *); 87 void cipher_get_keyiv(CipherContext *, u_char *, u_int); 88 void cipher_set_keyiv(CipherContext *, u_char *); 89 int cipher_get_keyiv_len(const CipherContext *); 90 int cipher_get_keycontext(const CipherContext *, u_char *); 91 void cipher_set_keycontext(CipherContext *, u_char *); 92 #endif /* CIPHER_H */ 93