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<hr><h1>sapphire.h</h1><div class="fragment"><pre>00001 <font class="comment">/* sapphire.h -- Interface for the Saphire II stream cipher.</font>
00002 <font class="comment"></font>
00003 <font class="comment"> Dedicated to the Public Domain the author and inventor</font>
00004 <font class="comment"> (Michael Paul Johnson). This code comes with no warranty.</font>
00005 <font class="comment"> Use it at your own risk.</font>
00006 <font class="comment"> Ported from the Pascal implementation of the Sapphire Stream</font>
00007 <font class="comment"> Cipher 9 December 1994.</font>
00008 <font class="comment"> Added hash-specific functions 27 December 1994.</font>
00009 <font class="comment"> Made index variable initialization key-dependent,</font>
00010 <font class="comment"> made the output function more resistant to cryptanalysis,</font>
00011 <font class="comment"> and renamed to Sapphire II Stream Cipher 2 January 1995.</font>
00012 <font class="comment"></font>
00013 <font class="comment"> unsigned char is assumed to be 8 bits. If it is not, the</font>
00014 <font class="comment"> results of assignments need to be reduced to 8 bits with</font>
00015 <font class="comment"> & 0xFF or % 0x100, whichever is faster.</font>
00016 <font class="comment">*/</font>
00017
00018 <font class="preprocessor">#ifndef NULL</font>
00019 <font class="preprocessor"></font><font class="preprocessor">#define NULL 0</font>
00020 <font class="preprocessor"></font><font class="preprocessor">#endif </font><font class="comment">/* */</font>
00021 <font class="keyword">class </font>sapphire
00022 {
00023
00024 <font class="comment">// These variables comprise the state of the state machine.</font>
00025 <font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> cards[256]; <font class="comment">// A permutation of 0-255.</font>
00026 <font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> rotor, <font class="comment">// Index that rotates smoothly</font>
00027 ratchet, <font class="comment">// Index that moves erratically</font>
00028 avalanche, <font class="comment">// Index heavily data dependent</font>
00029 last_plain, <font class="comment">// Last plain text byte</font>
00030 last_cipher; <font class="comment">// Last cipher text byte</font>
00031
00032 <font class="comment">// This function is used by initialize(), which is called by the</font>
00033 <font class="comment">// constructor.</font>
00034 <font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> keyrand (<font class="keywordtype">int</font> limit, <font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> *user_key,
00035 <font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> keysize, <font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> *rsum,
00036 <font class="keywordtype">unsigned</font> *keypos); <font class="keyword">public</font>:sapphire (<font class="keywordtype">unsigned</font> <font class="keywordtype">char</font>
00037 *key = NULL, <font class="comment">// Calls initialize if a real</font>
00038 <font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> keysize = 0); <font class="comment">// key is provided. If none</font>
00039 <font class="comment">// is provided, call initialize</font>
00040 <font class="comment">// before encrypt or decrypt.</font>
00041 ~sapphire (); <font class="comment">// Destroy cipher state information.</font>
00042 <font class="keywordtype">void</font> initialize (<font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> *key, <font class="comment">// User key is used to set</font>
00043 <font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> keysize); <font class="comment">// up state information.</font>
00044 <font class="keywordtype">void</font> hash_init (<font class="keywordtype">void</font>); <font class="comment">// Set up default hash.</font>
00045 <font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> encrypt (<font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> b = 0); <font class="comment">// Encrypt byte</font>
00046 <font class="comment">// or get a random byte.</font>
00047 <font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> decrypt (<font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> b); <font class="comment">// Decrypt byte.</font>
00048 <font class="keywordtype">void</font> hash_final (<font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> *hash, <font class="comment">// Copy hash value to hash</font>
00049 <font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> hashlength = 20); <font class="comment">// Hash length (16-32)</font>
00050 <font class="keywordtype">void</font> burn (<font class="keywordtype">void</font>); <font class="comment">// Destroy cipher state information.</font>
00051 };
00052
00053
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