| 1 | /* |
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| 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
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| 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
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| 4 | * All rights reserved |
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| 5 | * |
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| 6 | * As far as I am concerned, the code I have written for this software |
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| 7 | * can be used freely for any purpose. Any derived versions of this |
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| 8 | * software must be clearly marked as such, and if the derived work is |
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| 9 | * incompatible with the protocol description in the RFC file, it must be |
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| 10 | * called by a name other than "ssh" or "Secure Shell". |
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| 11 | * |
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| 12 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
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| 13 | * |
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| 14 | * Redistribution and use in source and binary forms, with or without |
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| 15 | * modification, are permitted provided that the following conditions |
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| 16 | * are met: |
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| 17 | * 1. Redistributions of source code must retain the above copyright |
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| 18 | * notice, this list of conditions and the following disclaimer. |
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| 19 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 20 | * notice, this list of conditions and the following disclaimer in the |
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| 21 | * documentation and/or other materials provided with the distribution. |
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| 22 | * |
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| 23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 26 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 29 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 30 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 33 | */ |
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| 34 | |
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| 35 | /* RCSID("$OpenBSD: cipher.h,v 1.29 2001/08/23 11:31:59 markus Exp $"); */ |
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| 36 | |
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| 37 | #ifndef CIPHER_H |
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| 38 | #define CIPHER_H |
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| 39 | |
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| 40 | #include <openssl/des.h> |
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| 41 | #include <openssl/blowfish.h> |
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| 42 | #include <openssl/rc4.h> |
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| 43 | #include <openssl/cast.h> |
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| 44 | #include "rijndael.h" |
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| 45 | /* |
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| 46 | * Cipher types for SSH-1. New types can be added, but old types should not |
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| 47 | * be removed for compatibility. The maximum allowed value is 31. |
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| 48 | */ |
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| 49 | #define SSH_CIPHER_SSH2 -3 |
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| 50 | #define SSH_CIPHER_ILLEGAL -2 /* No valid cipher selected. */ |
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| 51 | #define SSH_CIPHER_NOT_SET -1 /* None selected (invalid number). */ |
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| 52 | #define SSH_CIPHER_NONE 0 /* no encryption */ |
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| 53 | #define SSH_CIPHER_IDEA 1 /* IDEA CFB */ |
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| 54 | #define SSH_CIPHER_DES 2 /* DES CBC */ |
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| 55 | #define SSH_CIPHER_3DES 3 /* 3DES CBC */ |
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| 56 | #define SSH_CIPHER_BROKEN_TSS 4 /* TRI's Simple Stream encryption CBC */ |
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| 57 | #define SSH_CIPHER_BROKEN_RC4 5 /* Alleged RC4 */ |
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| 58 | #define SSH_CIPHER_BLOWFISH 6 |
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| 59 | #define SSH_CIPHER_RESERVED 7 |
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| 60 | #define SSH_CIPHER_MAX 31 |
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| 61 | |
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| 62 | typedef struct Cipher Cipher; |
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| 63 | typedef struct CipherContext CipherContext; |
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| 64 | |
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| 65 | struct CipherContext { |
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| 66 | union { |
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| 67 | struct { |
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| 68 | des_key_schedule key; |
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| 69 | des_cblock iv; |
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| 70 | } des; |
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| 71 | struct { |
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| 72 | des_key_schedule key1; |
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| 73 | des_key_schedule key2; |
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| 74 | des_key_schedule key3; |
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| 75 | des_cblock iv1; |
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| 76 | des_cblock iv2; |
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| 77 | des_cblock iv3; |
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| 78 | } des3; |
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| 79 | struct { |
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| 80 | struct bf_key_st key; |
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| 81 | u_char iv[8]; |
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| 82 | } bf; |
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| 83 | struct { |
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| 84 | CAST_KEY key; |
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| 85 | u_char iv[8]; |
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| 86 | } cast; |
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| 87 | struct { |
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| 88 | u_char iv[16]; |
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| 89 | rijndael_ctx enc; |
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| 90 | rijndael_ctx dec; |
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| 91 | } rijndael; |
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| 92 | RC4_KEY rc4; |
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| 93 | } u; |
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| 94 | Cipher *cipher; |
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| 95 | }; |
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| 96 | struct Cipher { |
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| 97 | char *name; |
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| 98 | int number; /* for ssh1 only */ |
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| 99 | u_int block_size; |
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| 100 | u_int key_len; |
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| 101 | void (*setkey)(CipherContext *, const u_char *, u_int); |
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| 102 | void (*setiv)(CipherContext *, const u_char *, u_int); |
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| 103 | void (*encrypt)(CipherContext *, u_char *, const u_char *, u_int); |
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| 104 | void (*decrypt)(CipherContext *, u_char *, const u_char *, u_int); |
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| 105 | }; |
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| 106 | |
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| 107 | u_int cipher_mask_ssh1(int); |
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| 108 | Cipher *cipher_by_name(const char *); |
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| 109 | Cipher *cipher_by_number(int); |
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| 110 | int cipher_number(const char *); |
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| 111 | char *cipher_name(int); |
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| 112 | int ciphers_valid(const char *); |
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| 113 | void cipher_init(CipherContext *, Cipher *, const u_char *, u_int, |
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| 114 | const u_char *, u_int); |
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| 115 | void cipher_encrypt(CipherContext *, u_char *, const u_char *, u_int); |
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| 116 | void cipher_decrypt(CipherContext *, u_char *, const u_char *, u_int); |
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| 117 | void cipher_set_key_string(CipherContext *, Cipher *, const char *); |
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| 118 | |
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| 119 | #endif /* CIPHER_H */ |
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