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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">   &amp; 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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