function sha1Hash(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
}