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added sha1 lib

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1 parent 8bf30af commit c2155c61bb3756ba93e5da209eca669981bcd31e @xantus committed Jul 8, 2010
Showing with 176 additions and 0 deletions.
  1. +176 −0 lib/socket.io/util/sha1.js
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@@ -0,0 +1,176 @@
+/**
+*
+* 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();
+
+}
+
+exports.sha1 = SHA1;

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