1 /* 2 * Author: Tatu Ylonen <ylo@cs.hut.fi> 3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 4 * All rights reserved 5 * 6 * As far as I am concerned, the code I have written for this software 7 * can be used freely for any purpose. Any derived versions of this 8 * software must be clearly marked as such, and if the derived work is 9 * incompatible with the protocol description in the RFC file, it must be 10 * called by a name other than "ssh" or "Secure Shell". 11 */ 12 13 /* RCSID("$OpenBSD: cipher.h,v 1.19 2000/09/07 20:27:50 deraadt Exp $"); */ 14 /* $FreeBSD$ */ 15 16 #ifndef CIPHER_H 17 #define CIPHER_H 18 19 #include <openssl/des.h> 20 #include <openssl/blowfish.h> 21 #include <openssl/rc4.h> 22 #include <openssl/cast.h> 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. */ 26 #define SSH_CIPHER_ILLEGAL -2 /* No valid cipher selected. */ 27 #define SSH_CIPHER_NOT_SET -1 /* None selected (invalid number). */ 28 #define SSH_CIPHER_NONE 0 /* no encryption */ 29 #define SSH_CIPHER_IDEA 1 /* IDEA CFB */ 30 #define SSH_CIPHER_DES 2 /* DES CBC */ 31 #define SSH_CIPHER_3DES 3 /* 3DES CBC */ 32 #define SSH_CIPHER_BROKEN_TSS 4 /* TRI's Simple Stream encryption CBC */ 33 #define SSH_CIPHER_BROKEN_RC4 5 /* Alleged RC4 */ 34 #define SSH_CIPHER_BLOWFISH 6 35 #define SSH_CIPHER_RESERVED 7 36 37 /* these ciphers are used in SSH2: */ 38 #define SSH_CIPHER_BLOWFISH_CBC 8 39 #define SSH_CIPHER_3DES_CBC 9 40 #define SSH_CIPHER_ARCFOUR 10 /* Alleged RC4 */ 41 #define SSH_CIPHER_CAST128_CBC 11 42 43 typedef struct { 44 unsigned int type; 45 union { 46 struct { 47 des_key_schedule key1; 48 des_key_schedule key2; 49 des_cblock iv2; 50 des_key_schedule key3; 51 des_cblock iv3; 52 } des3; 53 struct { 54 struct bf_key_st key; 55 unsigned char iv[8]; 56 } bf; 57 struct { 58 CAST_KEY key; 59 unsigned char iv[8]; 60 } cast; 61 RC4_KEY rc4; 62 } u; 63 } CipherContext; 64 /* 65 * Returns a bit mask indicating which ciphers are supported by this 66 * implementation. The bit mask has the corresponding bit set of each 67 * supported cipher. 68 */ 69 unsigned int cipher_mask(); 70 unsigned int cipher_mask1(); 71 unsigned int cipher_mask2(); 72 73 /* Returns the name of the cipher. */ 74 const char *cipher_name(int cipher); 75 76 /* 77 * Parses the name of the cipher. Returns the number of the corresponding 78 * cipher, or -1 on error. 79 */ 80 int cipher_number(const char *name); 81 82 /* returns 1 if all ciphers are supported (ssh2 only) */ 83 int ciphers_valid(const char *names); 84 85 /* 86 * Selects the cipher to use and sets the key. If for_encryption is true, 87 * the key is setup for encryption; otherwise it is setup for decryption. 88 */ 89 void 90 cipher_set_key(CipherContext * context, int cipher, 91 const unsigned char *key, int keylen); 92 void 93 cipher_set_key_iv(CipherContext * context, int cipher, 94 const unsigned char *key, int keylen, 95 const unsigned char *iv, int ivlen); 96 97 /* 98 * Sets key for the cipher by computing the MD5 checksum of the passphrase, 99 * and using the resulting 16 bytes as the key. 100 */ 101 void 102 cipher_set_key_string(CipherContext * context, int cipher, 103 const char *passphrase); 104 105 /* Encrypts data using the cipher. */ 106 void 107 cipher_encrypt(CipherContext * context, unsigned char *dest, 108 const unsigned char *src, unsigned int len); 109 110 /* Decrypts data using the cipher. */ 111 void 112 cipher_decrypt(CipherContext * context, unsigned char *dest, 113 const unsigned char *src, unsigned int len); 114 115 #endif /* CIPHER_H */ 116