Annotation of src/usr.bin/ssh/cipher.h, Revision 1.3
1.1 deraadt 1: /*
2:
3: cipher.h
4:
5: Author: Tatu Ylonen <ylo@cs.hut.fi>
6:
7: Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8: All rights reserved
9:
10: Created: Wed Apr 19 16:50:42 1995 ylo
11:
12: */
13:
1.3 ! deraadt 14: /* RCSID("$Id: cipher.h,v 1.2 1999/09/26 21:02:15 deraadt Exp $"); */
1.1 deraadt 15:
16: #ifndef CIPHER_H
17: #define CIPHER_H
18:
19: #include "des.h"
20: #ifdef WITH_RC4
21: #include "rc4.h"
22: #endif
23: #include "blowfish.h"
24:
25: /* Cipher types. New types can be added, but old types should not be removed
26: for compatibility. The maximum allowed value is 31. */
27: #define SSH_CIPHER_NOT_SET -1 /* None selected (invalid number). */
28: #define SSH_CIPHER_NONE 0 /* no encryption */
1.2 deraadt 29: #define SSH_CIPHER_IDEA 1 /* IDEA CFB -- not implemented */
1.1 deraadt 30: #define SSH_CIPHER_DES 2 /* DES CBC */
31: #define SSH_CIPHER_3DES 3 /* 3DES CBC */
32: #define SSH_CIPHER_TSS 4 /* TRI's Simple Stream encryption CBC */
33: #define SSH_CIPHER_RC4 5 /* Alleged RC4 */
34: #define SSH_CIPHER_BLOWFISH 6
35:
36: typedef struct {
37: unsigned int type;
38: union {
39: #ifdef WITH_DES
40: struct {
41: des_key_schedule key;
42: des_cblock iv;
43: } des;
44: #endif /* WITH_DES */
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: #ifdef WITH_RC4
53: RC4Context rc4;
54: #endif
55: struct {
56: struct bf_key_st key;
57: unsigned char iv[8];
58: } bf;
59: } u;
60: } CipherContext;
61:
62: /* Returns a bit mask indicating which ciphers are supported by this
63: implementation. The bit mask has the corresponding bit set of each
64: supported cipher. */
65: unsigned int cipher_mask();
66:
67: /* Returns the name of the cipher. */
68: const char *cipher_name(int cipher);
69:
70: /* Parses the name of the cipher. Returns the number of the corresponding
71: cipher, or -1 on error. */
72: int cipher_number(const char *name);
73:
74: /* Selects the cipher to use and sets the key. If for_encryption is true,
75: the key is setup for encryption; otherwise it is setup for decryption. */
76: void cipher_set_key(CipherContext *context, int cipher,
77: const unsigned char *key, int keylen, int for_encryption);
78:
79: /* Sets key for the cipher by computing the MD5 checksum of the passphrase,
80: and using the resulting 16 bytes as the key. */
81: void cipher_set_key_string(CipherContext *context, int cipher,
82: const char *passphrase, int for_encryption);
83:
84: /* Encrypts data using the cipher. */
85: void cipher_encrypt(CipherContext *context, unsigned char *dest,
86: const unsigned char *src, unsigned int len);
87:
88: /* Decrypts data using the cipher. */
89: void cipher_decrypt(CipherContext *context, unsigned char *dest,
90: const unsigned char *src, unsigned int len);
91:
92: /* If and CRC-32 attack is detected this function is called. Defaults
93: * to fatal, changed to packet_disconnect in sshd and ssh. */
94: extern void (*cipher_attack_detected)(const char *fmt, ...);
95:
96: #endif /* CIPHER_H */