Annotation of src/usr.bin/ssh/cipher.h, Revision 1.16
1.1 deraadt 1: /*
1.16 ! markus 2: *
1.9 deraadt 3: * cipher.h
1.16 ! markus 4: *
1.9 deraadt 5: * Author: Tatu Ylonen <ylo@cs.hut.fi>
1.16 ! markus 6: *
1.9 deraadt 7: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8: * All rights reserved
1.16 ! markus 9: *
1.9 deraadt 10: * Created: Wed Apr 19 16:50:42 1995 ylo
1.16 ! markus 11: *
1.9 deraadt 12: */
1.1 deraadt 13:
1.16 ! markus 14: /* RCSID("$Id: cipher.h,v 1.15 2000/04/12 09:39:10 markus Exp $"); */
1.1 deraadt 15:
16: #ifndef CIPHER_H
17: #define CIPHER_H
18:
1.15 markus 19: #include <openssl/des.h>
20: #include <openssl/blowfish.h>
21: #include <openssl/rc4.h>
22: #include <openssl/cast.h>
1.1 deraadt 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. */
1.9 deraadt 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 */
1.1 deraadt 33: #define SSH_CIPHER_BLOWFISH 6
1.12 markus 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
1.1 deraadt 41:
42: typedef struct {
1.9 deraadt 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;
1.12 markus 56: struct {
57: CAST_KEY key;
58: unsigned char iv[8];
59: } cast;
60: RC4_KEY rc4;
1.9 deraadt 61: } u;
62: } CipherContext;
1.10 markus 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: */
1.1 deraadt 68: unsigned int cipher_mask();
1.13 markus 69: unsigned int cipher_mask1();
70: unsigned int cipher_mask2();
1.1 deraadt 71:
72: /* Returns the name of the cipher. */
73: const char *cipher_name(int cipher);
74:
1.10 markus 75: /*
76: * Parses the name of the cipher. Returns the number of the corresponding
77: * cipher, or -1 on error.
78: */
1.9 deraadt 79: int cipher_number(const char *name);
1.14 markus 80:
81: /* returns 1 if all ciphers are supported (ssh2 only) */
82: int ciphers_valid(const char *names);
1.1 deraadt 83:
1.10 markus 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: */
1.16 ! markus 88: void
1.9 deraadt 89: cipher_set_key(CipherContext * context, int cipher,
1.13 markus 90: const unsigned char *key, int keylen);
1.16 ! markus 91: void
1.12 markus 92: cipher_set_key_iv(CipherContext * context, int cipher,
1.16 ! markus 93: const unsigned char *key, int keylen,
1.12 markus 94: const unsigned char *iv, int ivlen);
1.1 deraadt 95:
1.10 markus 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: */
1.16 ! markus 100: void
1.9 deraadt 101: cipher_set_key_string(CipherContext * context, int cipher,
1.13 markus 102: const char *passphrase);
1.1 deraadt 103:
104: /* Encrypts data using the cipher. */
1.16 ! markus 105: void
1.9 deraadt 106: cipher_encrypt(CipherContext * context, unsigned char *dest,
107: const unsigned char *src, unsigned int len);
1.1 deraadt 108:
109: /* Decrypts data using the cipher. */
1.16 ! markus 110: void
1.9 deraadt 111: cipher_decrypt(CipherContext * context, unsigned char *dest,
112: const unsigned char *src, unsigned int len);
1.1 deraadt 113:
1.9 deraadt 114: #endif /* CIPHER_H */