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 * $FreeBSD$ 13 */ 14 15 /* RCSID("$Id: cipher.h,v 1.17 2000/05/08 17:12:15 markus Exp $"); */ 16 17 #ifndef CIPHER_H 18 #define CIPHER_H 19 20 #include <openssl/des.h> 21 #include <openssl/blowfish.h> 22 #include <openssl/rc4.h> 23 #include <openssl/cast.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_ILLEGAL -2 /* No valid cipher selected. */ 28 #define SSH_CIPHER_NOT_SET -1 /* None selected (invalid number). */ 29 #define SSH_CIPHER_NONE 0 /* no encryption */ 30 #define SSH_CIPHER_IDEA 1 /* IDEA CFB */ 31 #define SSH_CIPHER_DES 2 /* DES CBC */ 32 #define SSH_CIPHER_3DES 3 /* 3DES CBC */ 33 #define SSH_CIPHER_BROKEN_TSS 4 /* TRI's Simple Stream encryption CBC */ 34 #define SSH_CIPHER_BROKEN_RC4 5 /* Alleged RC4 */ 35 #define SSH_CIPHER_BLOWFISH 6 36 #define SSH_CIPHER_RESERVED 7 37 38 /* these ciphers are used in SSH2: */ 39 #define SSH_CIPHER_BLOWFISH_CBC 8 40 #define SSH_CIPHER_3DES_CBC 9 41 #define SSH_CIPHER_ARCFOUR 10 /* Alleged RC4 */ 42 #define SSH_CIPHER_CAST128_CBC 11 43 44 typedef struct { 45 unsigned int type; 46 union { 47 struct { 48 des_key_schedule key1; 49 des_key_schedule key2; 50 des_cblock iv2; 51 des_key_schedule key3; 52 des_cblock iv3; 53 } des3; 54 struct { 55 struct bf_key_st key; 56 unsigned char iv[8]; 57 } bf; 58 struct { 59 CAST_KEY key; 60 unsigned char iv[8]; 61 } cast; 62 RC4_KEY rc4; 63 } u; 64 } CipherContext; 65 /* 66 * Returns a bit mask indicating which ciphers are supported by this 67 * implementation. The bit mask has the corresponding bit set of each 68 * supported cipher. 69 */ 70 unsigned int cipher_mask(); 71 unsigned int cipher_mask1(); 72 unsigned int cipher_mask2(); 73 74 /* Returns the name of the cipher. */ 75 const char *cipher_name(int cipher); 76 77 /* 78 * Parses the name of the cipher. Returns the number of the corresponding 79 * cipher, or -1 on error. 80 */ 81 int cipher_number(const char *name); 82 83 /* returns 1 if all ciphers are supported (ssh2 only) */ 84 int ciphers_valid(const char *names); 85 86 /* 87 * Selects the cipher to use and sets the key. If for_encryption is true, 88 * the key is setup for encryption; otherwise it is setup for decryption. 89 */ 90 void 91 cipher_set_key(CipherContext * context, int cipher, 92 const unsigned char *key, int keylen); 93 void 94 cipher_set_key_iv(CipherContext * context, int cipher, 95 const unsigned char *key, int keylen, 96 const unsigned char *iv, int ivlen); 97 98 /* 99 * Sets key for the cipher by computing the MD5 checksum of the passphrase, 100 * and using the resulting 16 bytes as the key. 101 */ 102 void 103 cipher_set_key_string(CipherContext * context, int cipher, 104 const char *passphrase); 105 106 /* Encrypts data using the cipher. */ 107 void 108 cipher_encrypt(CipherContext * context, unsigned char *dest, 109 const unsigned char *src, unsigned int len); 110 111 /* Decrypts data using the cipher. */ 112 void 113 cipher_decrypt(CipherContext * context, unsigned char *dest, 114 const unsigned char *src, unsigned int len); 115 116 #endif /* CIPHER_H */ 117