| The Sword Project: sapphire.h Source File |
00001 /* sapphire.h -- Interface for the Saphire II stream cipher. 00002 00003 Dedicated to the Public Domain the author and inventor 00004 (Michael Paul Johnson). This code comes with no warranty. 00005 Use it at your own risk. 00006 Ported from the Pascal implementation of the Sapphire Stream 00007 Cipher 9 December 1994. 00008 Added hash-specific functions 27 December 1994. 00009 Made index variable initialization key-dependent, 00010 made the output function more resistant to cryptanalysis, 00011 and renamed to Sapphire II Stream Cipher 2 January 1995. 00012 00013 unsigned char is assumed to be 8 bits. If it is not, the 00014 results of assignments need to be reduced to 8 bits with 00015 & 0xFF or % 0x100, whichever is faster. 00016 */ 00017 00018 #ifndef NULL 00019 #define NULL 0 00020 #endif /* */ 00021 00022 #include <defs.h> 00023 00024 SWORD_NAMESPACE_START 00025 00026 class sapphire 00027 { 00028 00029 // These variables comprise the state of the state machine. 00030 unsigned char cards[256]; // A permutation of 0-255. 00031 unsigned char rotor, // Index that rotates smoothly 00032 ratchet, // Index that moves erratically 00033 avalanche, // Index heavily data dependent 00034 last_plain, // Last plain text byte 00035 last_cipher; // Last cipher text byte 00036 00037 // This function is used by initialize(), which is called by the 00038 // constructor. 00039 unsigned char keyrand (int limit, unsigned char *user_key, 00040 unsigned char keysize, unsigned char *rsum, 00041 unsigned *keypos); public:sapphire (unsigned char 00042 *key = NULL, // Calls initialize if a real 00043 unsigned char keysize = 0); // key is provided. If none 00044 // is provided, call initialize 00045 // before encrypt or decrypt. 00046 ~sapphire (); // Destroy cipher state information. 00047 void initialize (unsigned char *key, // User key is used to set 00048 unsigned char keysize); // up state information. 00049 void hash_init (void); // Set up default hash. 00050 unsigned char encrypt (unsigned char b = 0); // Encrypt byte 00051 // or get a random byte. 00052 unsigned char decrypt (unsigned char b); // Decrypt byte. 00053 void hash_final (unsigned char *hash, // Copy hash value to hash 00054 unsigned char hashlength = 20); // Hash length (16-32) 00055 void burn (void); // Destroy cipher state information. 00056 }; 00057 00058 00059 SWORD_NAMESPACE_END
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