Annotation of src/usr.bin/ssh/cipher.h, Revision 1.6
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:
1.6 ! deraadt 14: /* RCSID("$Id: cipher.h,v 1.5 1999/09/30 08:34:24 deraadt Exp $"); */
1.1 deraadt 15:
16: #ifndef CIPHER_H
17: #define CIPHER_H
18:
1.6 ! deraadt 19: #include <des.h>
1.1 deraadt 20: #include "blowfish.h"
21:
22: /* Cipher types. New types can be added, but old types should not be removed
23: for compatibility. The maximum allowed value is 31. */
24: #define SSH_CIPHER_NOT_SET -1 /* None selected (invalid number). */
25: #define SSH_CIPHER_NONE 0 /* no encryption */
1.4 provos 26: #define SSH_CIPHER_IDEA 1 /* IDEA CFB */
1.1 deraadt 27: #define SSH_CIPHER_DES 2 /* DES CBC */
28: #define SSH_CIPHER_3DES 3 /* 3DES CBC */
29: #define SSH_CIPHER_TSS 4 /* TRI's Simple Stream encryption CBC */
30: #define SSH_CIPHER_RC4 5 /* Alleged RC4 */
31: #define SSH_CIPHER_BLOWFISH 6
32:
33: typedef struct {
34: unsigned int type;
35: union {
36: struct {
37: des_key_schedule key1;
38: des_key_schedule key2;
39: des_cblock iv2;
40: des_key_schedule key3;
41: des_cblock iv3;
42: } des3;
43: struct {
44: struct bf_key_st key;
45: unsigned char iv[8];
46: } bf;
47: } u;
48: } CipherContext;
49:
50: /* Returns a bit mask indicating which ciphers are supported by this
51: implementation. The bit mask has the corresponding bit set of each
52: supported cipher. */
53: unsigned int cipher_mask();
54:
55: /* Returns the name of the cipher. */
56: const char *cipher_name(int cipher);
57:
58: /* Parses the name of the cipher. Returns the number of the corresponding
59: cipher, or -1 on error. */
60: int cipher_number(const char *name);
61:
62: /* Selects the cipher to use and sets the key. If for_encryption is true,
63: the key is setup for encryption; otherwise it is setup for decryption. */
64: void cipher_set_key(CipherContext *context, int cipher,
65: const unsigned char *key, int keylen, int for_encryption);
66:
67: /* Sets key for the cipher by computing the MD5 checksum of the passphrase,
68: and using the resulting 16 bytes as the key. */
69: void cipher_set_key_string(CipherContext *context, int cipher,
70: const char *passphrase, int for_encryption);
71:
72: /* Encrypts data using the cipher. */
73: void cipher_encrypt(CipherContext *context, unsigned char *dest,
74: const unsigned char *src, unsigned int len);
75:
76: /* Decrypts data using the cipher. */
77: void cipher_decrypt(CipherContext *context, unsigned char *dest,
78: const unsigned char *src, unsigned int len);
79:
80: /* If and CRC-32 attack is detected this function is called. Defaults
81: * to fatal, changed to packet_disconnect in sshd and ssh. */
82: extern void (*cipher_attack_detected)(const char *fmt, ...);
83:
84: #endif /* CIPHER_H */