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function sha1(str) {
// discuss at: http://phpjs.org/functions/sha1/
// original by: Webtoolkit.info (http://www.webtoolkit.info/)
// improved by: Michael White (http://getsprink.com)
// improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// input by: Brett Zamir (http://brett-zamir.me)
// example 1: sha1('Kevin van Zonneveld');
// returns 1: '54916d2e62f65b3afa6e192e6a601cdbe5cb5897'
var rotate_left = function (n, s) {
var t4 = (n << s) | (n >>> (32 - s));
return t4;
};
/*var lsb_hex = function (val) {
// Not in use; needed?
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;
};*/
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;
// utf8_encode
str = unescape(encodeURIComponent(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();
}
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