function sha1(msg)
{
        var K = [0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6];


     
    msg += String.fromCharCode(0x80);         var l = Math.ceil(msg.length/4) + 2;      var N = Math.ceil(l/16);                  var M = new Array(N);
    for (var i=0; i<N; i++) {
        M[i] = new Array(16);
        for (var j=0; j<16; j++) {              M[i][j] = (msg.charCodeAt(i*64+j*4)<<24) | (msg.charCodeAt(i*64+j*4+1)<<16) | 
                      (msg.charCodeAt(i*64+j*4+2)<<8) | (msg.charCodeAt(i*64+j*4+3));
        }
    }
                M[N-1][14] = ((msg.length-1)*8) / Math.pow(2, 32); M[N-1][14] = Math.floor(M[N-1][14])
    M[N-1][15] = ((msg.length-1)*8) & 0xffffffff;

        var H0 = 0x67452301;
    var H1 = 0xefcdab89;
    var H2 = 0x98badcfe;
    var H3 = 0x10325476;
    var H4 = 0xc3d2e1f0;

        var W = new Array(80); var a, b, c, d, e;
    for (var i=0; i<N; i++) {

                for (var t=0;  t<16; t++) W[t] = M[i][t];
        for (var t=16; t<80; t++) W[t] = rotl(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16], 1);

                a = H0; b = H1; c = H2; d = H3; e = H4;

                for (var t=0; t<80; t++) {
            var s = Math.floor(t/20);             var T = (rotl(a,5) + f(s,b,c,d) + e + K[s] + W[t]) & 0xffffffff;
            e = d;
            d = c;
            c = rotl(b, 30);
            b = a;
            a = T;
        }

                H0 = (H0+a) & 0xffffffff;          H1 = (H1+b) & 0xffffffff; 
        H2 = (H2+c) & 0xffffffff; 
        H3 = (H3+d) & 0xffffffff; 
        H4 = (H4+e) & 0xffffffff;
    }

    return H0.toHexStr() + H1.toHexStr() + H2.toHexStr() + H3.toHexStr() + H4.toHexStr();
}

function f(s, x, y, z) 
{
    switch (s) {
    case 0: return (x & y) ^ (~x & z);               case 1: return x ^ y ^ z;                        case 2: return (x & y) ^ (x & z) ^ (y & z);      case 3: return x ^ y ^ z;                        }
}

function rotl(x, n)
{
    return (x<<n) | (x>>>(32-n));
}

Number.prototype.toHexStr = function()
{
    var s="", v;
    for (var i=7; i>=0; i--) { v = (this>>>(i*4)) & 0xf; s += v.toString(16); }
    return s;
}