sha1Encrypt.js

/**
* Secure Hash Algorithm (SHA1)
* http://www.webtoolkit.info/
**/
function SHA1(msg) {
 function rotate_left(n,s) {
 var t4 = ( n<<s ) | (n>>>(32-s));
 return t4;
 };
 function lsb_hex(val) {
 var str='';
 var i;
 var vh;
 var vl;
 for( i=0; i<=6; i+=2 ) {
 vh = (val>>>(i*4+4))&0x0f;
 vl = (val>>>(i*4))&0x0f;
 str += vh.toString(16) + vl.toString(16);
 }
 return str;
 };
 function cvt_hex(val) {
 var str='';
 var i;
 var v;
 for( i=7; i>=0; i-- ) {
 v = (val>>>(i*4))&0x0f;
 str += v.toString(16);
 }
 return str;
 };
 function Utf8Encode(string) {
 string = string.replace(/\r\n/g,'\n');
 var utftext = '';
 for (var n = 0; n < string.length; n++) {
 var c = string.charCodeAt(n);
 if (c < 128) {
 utftext += String.fromCharCode(c);
 }
 else if((c > 127) && (c < 2048)) {
 utftext += String.fromCharCode((c >> 6) | 192);
 utftext += String.fromCharCode((c & 63) | 128);
 }
 else {
 utftext += String.fromCharCode((c >> 12) | 224);
 utftext += String.fromCharCode(((c >> 6) & 63) | 128);
 utftext += String.fromCharCode((c & 63) | 128);
 }
 }
 return utftext;
 };
 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;
 msg = Utf8Encode(msg);
 var msg_len = msg.length;
 var word_array = new Array();
 for( i=0; i<msg_len-3; i+=4 ) {
 j = msg.charCodeAt(i)<<24 | msg.charCodeAt(i+1)<<16 |
 msg.charCodeAt(i+2)<<8 | msg.charCodeAt(i+3);
 word_array.push( j );
 }
 switch( msg_len % 4 ) {
 case 0:
 i = 0x080000000;
 break;
 case 1:
 i = msg.charCodeAt(msg_len-1)<<24 | 0x0800000;
 break;
 case 2:
 i = msg.charCodeAt(msg_len-2)<<24 | msg.charCodeAt(msg_len-1)<<16 | 0x08000;
 break;
 case 3:
 i = msg.charCodeAt(msg_len-3)<<24 | msg.charCodeAt(msg_len-2)<<16 | msg.charCodeAt(msg_len-1)<<8 | 0x80;
 break;
 }
 word_array.push( i );
 while( (word_array.length % 16) != 14 ) word_array.push( 0 );
 word_array.push( msg_len>>>29 );
 word_array.push( (msg_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;
 }
 var temp = cvt_hex(H0) + cvt_hex(H1) + cvt_hex(H2) + cvt_hex(H3) + cvt_hex(H4);

 return temp.toLowerCase();
}