izymodtask/encodedecode/sha1.js

modtask components for Izyware

var modtask =
{
	utf8_encode : function (argString) {
 	  if (argString === null || typeof argString === "undefined") {
	    return "";
	  }

	  var string = (argString + ''); // .replace(/\r\n/g, "\n").replace(/\r/g, "\n");
	  var utftext = '',
	    start, end, stringl = 0;

	  start = end = 0;
	  stringl = string.length;
	  for (var n = 0; n < stringl; n++) {
	    var c1 = string.charCodeAt(n);
	    var enc = null;

	    if (c1 < 128) {
	      end++;
	    } else if (c1 > 127 && c1 < 2048) {
	      enc = String.fromCharCode((c1 >> 6) | 192, (c1 & 63) | 128);
	    } else {
	      enc = String.fromCharCode((c1 >> 12) | 224, ((c1 >> 6) & 63) | 128, (c1 & 63) | 128);
	    }
	    if (enc !== null) {
	      if (end > start) {
		utftext += string.slice(start, end);
	      }
	      utftext += enc;
	      start = end = n + 1;
	    }
	  }

	  if (end > start) {
	    utftext += string.slice(start, stringl);
	  }

	  return utftext;
	},
		    
	sha1 : function (str) {
 	  var rotate_left = function (n, s) {
	    var t4 = (n << s) | (n >>> (32 - s));
	    return t4;
	  };
 

	  var cvt_hex = function (val) {
	    var str = "";
	    var i;
	    var v;

	    for (i = 7; i >= 0; i--) {
	      v = (val >>> (i * 4)) & 0x0f;
	      str += v.toString(16);
	    }
	    return str;
	  };

	  var blockstart;
	  var i, j;
	  var W = new Array(80);
	  var H0 = 0x67452301;
	  var H1 = 0xEFCDAB89;
	  var H2 = 0x98BADCFE;
	  var H3 = 0x10325476;
	  var H4 = 0xC3D2E1F0;
	  var A, B, C, D, E;
	  var temp;

	  str = modtask.utf8_encode(str);
	  var str_len = str.length;

	  var word_array = [];
	  for (i = 0; i < str_len - 3; i += 4) {
	    j = str.charCodeAt(i) << 24 | str.charCodeAt(i + 1) << 16 | str.charCodeAt(i + 2) << 8 | str.charCodeAt(i + 3);
	    word_array.push(j);
	  }

	  switch (str_len % 4) {
	  case 0:
	    i = 0x080000000;
	    break;
	  case 1:
	    i = str.charCodeAt(str_len - 1) << 24 | 0x0800000;
	    break;
	  case 2:
	    i = str.charCodeAt(str_len - 2) << 24 | str.charCodeAt(str_len - 1) << 16 | 0x08000;
	    break;
	  case 3:
	    i = str.charCodeAt(str_len - 3) << 24 | str.charCodeAt(str_len - 2) << 16 | str.charCodeAt(str_len - 1) << 8 | 0x80;
	    break;
	  }

	  word_array.push(i);

	  while ((word_array.length % 16) != 14) {
	    word_array.push(0);
	  }

	  word_array.push(str_len >>> 29);
	  word_array.push((str_len << 3) & 0x0ffffffff);

	  for (blockstart = 0; blockstart < word_array.length; blockstart += 16) {
	    for (i = 0; i < 16; i++) {
	      W[i] = word_array[blockstart + i];
	    }
	    for (i = 16; i <= 79; i++) {
	      W[i] = rotate_left(W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16], 1);
	    }


	    A = H0;
	    B = H1;
	    C = H2;
	    D = H3;
	    E = H4;

	    for (i = 0; i <= 19; i++) {
	      temp = (rotate_left(A, 5) + ((B & C) | (~B & D)) + E + W[i] + 0x5A827999) & 0x0ffffffff;
	      E = D;
	      D = C;
	      C = rotate_left(B, 30);
	      B = A;
	      A = temp;
	    }

	    for (i = 20; i <= 39; i++) {
	      temp = (rotate_left(A, 5) + (B ^ C ^ D) + E + W[i] + 0x6ED9EBA1) & 0x0ffffffff;
	      E = D;
	      D = C;
	      C = rotate_left(B, 30);
	      B = A;
	      A = temp;
	    }

	    for (i = 40; i <= 59; i++) {
	      temp = (rotate_left(A, 5) + ((B & C) | (B & D) | (C & D)) + E + W[i] + 0x8F1BBCDC) & 0x0ffffffff;
	      E = D;
	      D = C;
	      C = rotate_left(B, 30);
	      B = A;
	      A = temp;
	    }

	    for (i = 60; i <= 79; i++) {
	      temp = (rotate_left(A, 5) + (B ^ C ^ D) + E + W[i] + 0xCA62C1D6) & 0x0ffffffff;
	      E = D;
	      D = C;
	      C = rotate_left(B, 30);
	      B = A;
	      A = temp;
	    }

	    H0 = (H0 + A) & 0x0ffffffff;
	    H1 = (H1 + B) & 0x0ffffffff;
	    H2 = (H2 + C) & 0x0ffffffff;
	    H3 = (H3 + D) & 0x0ffffffff;
	    H4 = (H4 + E) & 0x0ffffffff;
	  }

	  temp = cvt_hex(H0) + cvt_hex(H1) + cvt_hex(H2) + cvt_hex(H3) + cvt_hex(H4);
	  return temp.toLowerCase();
	}
	


}