https://www.novalix-conferences.org/scriptsv3/antalys2.js?antdocvers=20101126181740

1
2var Qqchose = {};  // Qqchose namespace
3
4/**
5 * 
6 * @param {String} msg                String to be hashed
7 * @param {Boolean} [utf8encode=true] Encode msg as UTF-8 before generating hash
8 * @returns {String}                  Hash of msg as hex character string
9 */
10Qqchose.bout = function(msg, utf8encode) {
11  utf8encode =  (typeof utf8encode == 'undefined') ? true : utf8encode;
12  
13  if (utf8encode) msg = Utf8.encode(msg);
14  
15  // constants [§4.2.1]
16  var K = [0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6];
17  
18  // PREPROCESSING 
19  
20  msg += String.fromCharCode(0x80);  // add trailing '1' bit (+ 0's padding) to string [§5.1.1]
21  
22  // convert string msg into 512-bit/16-integer blocks arrays of ints [§5.2.1]
23  var l = msg.length/4 + 2;  // length (in 32-bit integers) of msg + ‘1’ + appended length
24  var N = Math.ceil(l/16);   // number of 16-integer-blocks required to hold 'l' ints
25  var M = new Array(N);
26  
27  for (var i=0; i<N; i++) {
28    M[i] = new Array(16);
29    for (var j=0; j<16; j++) {  // encode 4 chars per integer, big-endian encoding
30      M[i][j] = (msg.charCodeAt(i*64+j*4)<<24) | (msg.charCodeAt(i*64+j*4+1)<<16) | 
31        (msg.charCodeAt(i*64+j*4+2)<<8) | (msg.charCodeAt(i*64+j*4+3));
32    } // note running off the end of msg is ok 'cos bitwise ops on NaN return 0
33  }
34  // add length (in bits) into final pair of 32-bit integers (big-endian) [§5.1.1]
35  // note: most significant word would be (len-1)*8 >>> 32, but since JS converts
36  // bitwise-op args to 32 bits, we need to simulate this by arithmetic operators
37  M[N-1][14] = ((msg.length-1)*8) / Math.pow(2, 32); M[N-1][14] = Math.floor(M[N-1][14])
38  M[N-1][15] = ((msg.length-1)*8) & 0xffffffff;
39  
40  // set initial hash value [§5.3.1]
41  var H0 = 0x67452301;
42  var H1 = 0xefcdab89;
43  var H2 = 0x98badcfe;
44  var H3 = 0x10325476;
45  var H4 = 0xc3d2e1f0;
46  
47  // HASH COMPUTATION [§6.1.2]
48  
49  var W = new Array(80); var a, b, c, d, e;
50  for (var i=0; i<N; i++) {
51  
52    // 1 - prepare message schedule 'W'
53    for (var t=0;  t<16; t++) W[t] = M[i][t];
54    for (var t=16; t<80; t++) W[t] = Qqchose.ROTL(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16], 1);
55    
56    // 2 - initialise five working variables a, b, c, d, e with previous hash value
57    a = H0; b = H1; c = H2; d = H3; e = H4;
58    
59    // 3 - main loop
60    for (var t=0; t<80; t++) {
61      var s = Math.floor(t/20); // seq for blocks of 'f' functions and 'K' constants
62      var T = (Qqchose.ROTL(a,5) + Qqchose.f(s,b,c,d) + e + K[s] + W[t]) & 0xffffffff;
63      e = d;
64      d = c;
65      c = Qqchose.ROTL(b, 30);
66      b = a;
67      a = T;
68    }
69    
70    // 4 - compute the new intermediate hash value
71    H0 = (H0+a) & 0xffffffff;  // note 'addition modulo 2^32'
72    H1 = (H1+b) & 0xffffffff; 
73    H2 = (H2+c) & 0xffffffff; 
74    H3 = (H3+d) & 0xffffffff; 
75    H4 = (H4+e) & 0xffffffff;
76  }
77
78  return Qqchose.toHexStr(H0) + Qqchose.toHexStr(H1) + 
79    Qqchose.toHexStr(H2) + Qqchose.toHexStr(H3) + Qqchose.toHexStr(H4);
80}
81
82//
83// function 'f' [§4.1.1]
84//
85Qqchose.f = function(s, x, y, z)  {
86  switch (s) {
87  case 0: return (x & y) ^ (~x & z);           // Ch()
88  case 1: return x ^ y ^ z;                    // Parity()
89  case 2: return (x & y) ^ (x & z) ^ (y & z);  // Maj()
90  case 3: return x ^ y ^ z;                    // Parity()
91  }
92}
93
94//
95// rotate left (circular left shift) value x by n positions [§3.2.5]
96//
97Qqchose.ROTL = function(x, n) {
98  return (x<<n) | (x>>>(32-n));
99}
100
101//
102// hexadecimal representation of a number 
103//   (note toString(16) is implementation-dependant, and  
104//   in IE returns signed numbers when used on full words)
105//
106Qqchose.toHexStr = function(n) {
107  var s="", v;
108  for (var i=7; i>=0; i--) { v = (n>>>(i*4)) & 0xf; s += v.toString(16); }
109  return s;
110}
111
112
113/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
114/*  Utf8 class: encode / decode between multi-byte Unicode characters and UTF-8 multiple          */
115/*              single-byte character encoding (c) Chris Veness 2002-2010                         */
116/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
117
118var Utf8 = {};  // Utf8 namespace
119
120/**
121 * Encode multi-byte Unicode string into utf-8 multiple single-byte characters 
122 * (BMP / basic multilingual plane only)
123 *
124 * Chars in range U+0080 - U+07FF are encoded in 2 chars, U+0800 - U+FFFF in 3 chars
125 *
126 * @param {String} strUni Unicode string to be encoded as UTF-8
127 * @returns {String} encoded string
128 */
129Utf8.encode = function(strUni) {
130  // use regular expressions & String.replace callback function for better efficiency 
131  // than procedural approaches
132  var strUtf = strUni.replace(
133      /[\u0080-\u07ff]/g,  // U+0080 - U+07FF => 2 bytes 110yyyyy, 10zzzzzz
134      function(c) { 

135        var cc = c.charCodeAt(0);
136        return String.fromCharCode(0xc0 | cc>>6, 0x80 | cc&0x3f); }
137    );
138  strUtf = strUtf.replace(
139      /[\u0800-\uffff]/g,  // U+0800 - U+FFFF => 3 bytes 1110xxxx, 10yyyyyy, 10zzzzzz
140      function(c) { 
141        var cc = c.charCodeAt(0); 
142        return String.fromCharCode(0xe0 | cc>>12, 0x80 | cc>>6&0x3F, 0x80 | cc&0x3f); }
143    );
144  return strUtf;
145}
146
147/**
148 * Decode utf-8 encoded string back into multi-byte Unicode characters
149 *
150 * @param {String} strUtf UTF-8 string to be decoded back to Unicode
151 * @returns {String} decoded string
152 */
153Utf8.decode = function(strUtf) {
154  // note: decode 3-byte chars first as decoded 2-byte strings could appear to be 3-byte char!
155  var strUni = strUtf.replace(
156      /[\u00e0-\u00ef][\u0080-\u00bf][\u0080-\u00bf]/g,  // 3-byte chars
157      function(c) {  // (note parentheses for precence)
158        var cc = ((c.charCodeAt(0)&0x0f)<<12) | ((c.charCodeAt(1)&0x3f)<<6) | ( c.charCodeAt(2)&0x3f); 
159        return String.fromCharCode(cc); }
160    );
161  strUni = strUni.replace(
162      /[\u00c0-\u00df][\u0080-\u00bf]/g,                 // 2-byte chars
163      function(c) {  // (note parentheses for precence)
164        var cc = (c.charCodeAt(0)&0x1f)<<6 | c.charCodeAt(1)&0x3f;
165        return String.fromCharCode(cc); }
166    );
167  return strUni;
168}