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8efc0c15 | 1 | /* |
6ae2364d | 2 | * |
5260325f | 3 | * cipher.h |
6ae2364d | 4 | * |
5260325f | 5 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
6ae2364d | 6 | * |
5260325f | 7 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
8 | * All rights reserved | |
6ae2364d | 9 | * |
5260325f | 10 | * Created: Wed Apr 19 16:50:42 1995 ylo |
6ae2364d | 11 | * |
5260325f | 12 | */ |
8efc0c15 | 13 | |
14 | /* RCSID("$Id$"); */ | |
15 | ||
16 | #ifndef CIPHER_H | |
17 | #define CIPHER_H | |
18 | ||
19 | #include <openssl/des.h> | |
20 | #include <openssl/blowfish.h> | |
7368a6c8 | 21 | #include <openssl/rc4.h> |
22 | #include <openssl/cast.h> | |
8efc0c15 | 23 | |
24 | /* Cipher types. New types can be added, but old types should not be removed | |
25 | for compatibility. The maximum allowed value is 31. */ | |
5260325f | 26 | #define SSH_CIPHER_NOT_SET -1 /* None selected (invalid number). */ |
27 | #define SSH_CIPHER_NONE 0 /* no encryption */ | |
28 | #define SSH_CIPHER_IDEA 1 /* IDEA CFB */ | |
29 | #define SSH_CIPHER_DES 2 /* DES CBC */ | |
30 | #define SSH_CIPHER_3DES 3 /* 3DES CBC */ | |
31 | #define SSH_CIPHER_BROKEN_TSS 4 /* TRI's Simple Stream encryption CBC */ | |
32 | #define SSH_CIPHER_BROKEN_RC4 5 /* Alleged RC4 */ | |
8efc0c15 | 33 | #define SSH_CIPHER_BLOWFISH 6 |
7368a6c8 | 34 | #define SSH_CIPHER_RESERVED 7 |
35 | ||
36 | /* these ciphers are used in SSH2: */ | |
37 | #define SSH_CIPHER_BLOWFISH_CBC 8 | |
38 | #define SSH_CIPHER_3DES_CBC 9 | |
39 | #define SSH_CIPHER_ARCFOUR 10 /* Alleged RC4 */ | |
40 | #define SSH_CIPHER_CAST128_CBC 11 | |
8efc0c15 | 41 | |
42 | typedef struct { | |
5260325f | 43 | unsigned int type; |
44 | union { | |
45 | struct { | |
46 | des_key_schedule key1; | |
47 | des_key_schedule key2; | |
48 | des_cblock iv2; | |
49 | des_key_schedule key3; | |
50 | des_cblock iv3; | |
51 | } des3; | |
52 | struct { | |
53 | struct bf_key_st key; | |
54 | unsigned char iv[8]; | |
55 | } bf; | |
7368a6c8 | 56 | struct { |
57 | CAST_KEY key; | |
58 | unsigned char iv[8]; | |
59 | } cast; | |
60 | RC4_KEY rc4; | |
5260325f | 61 | } u; |
62 | } CipherContext; | |
aa3378df | 63 | /* |
64 | * Returns a bit mask indicating which ciphers are supported by this | |
65 | * implementation. The bit mask has the corresponding bit set of each | |
66 | * supported cipher. | |
67 | */ | |
8efc0c15 | 68 | unsigned int cipher_mask(); |
8ce64345 | 69 | unsigned int cipher_mask1(); |
70 | unsigned int cipher_mask2(); | |
8efc0c15 | 71 | |
72 | /* Returns the name of the cipher. */ | |
73 | const char *cipher_name(int cipher); | |
74 | ||
aa3378df | 75 | /* |
76 | * Parses the name of the cipher. Returns the number of the corresponding | |
77 | * cipher, or -1 on error. | |
78 | */ | |
5260325f | 79 | int cipher_number(const char *name); |
8efc0c15 | 80 | |
a8be9f80 | 81 | /* returns 1 if all ciphers are supported (ssh2 only) */ |
82 | int ciphers_valid(const char *names); | |
83 | ||
aa3378df | 84 | /* |
85 | * Selects the cipher to use and sets the key. If for_encryption is true, | |
86 | * the key is setup for encryption; otherwise it is setup for decryption. | |
87 | */ | |
6ae2364d | 88 | void |
5260325f | 89 | cipher_set_key(CipherContext * context, int cipher, |
8ce64345 | 90 | const unsigned char *key, int keylen); |
6ae2364d | 91 | void |
7368a6c8 | 92 | cipher_set_key_iv(CipherContext * context, int cipher, |
6ae2364d | 93 | const unsigned char *key, int keylen, |
7368a6c8 | 94 | const unsigned char *iv, int ivlen); |
8efc0c15 | 95 | |
aa3378df | 96 | /* |
97 | * Sets key for the cipher by computing the MD5 checksum of the passphrase, | |
98 | * and using the resulting 16 bytes as the key. | |
99 | */ | |
6ae2364d | 100 | void |
5260325f | 101 | cipher_set_key_string(CipherContext * context, int cipher, |
8ce64345 | 102 | const char *passphrase); |
8efc0c15 | 103 | |
104 | /* Encrypts data using the cipher. */ | |
6ae2364d | 105 | void |
5260325f | 106 | cipher_encrypt(CipherContext * context, unsigned char *dest, |
107 | const unsigned char *src, unsigned int len); | |
8efc0c15 | 108 | |
109 | /* Decrypts data using the cipher. */ | |
6ae2364d | 110 | void |
5260325f | 111 | cipher_decrypt(CipherContext * context, unsigned char *dest, |
112 | const unsigned char *src, unsigned int len); | |
8efc0c15 | 113 | |
5260325f | 114 | #endif /* CIPHER_H */ |