function rotateRight(n,x) {return ((x >>> n) | (x << (32 - n)));}
function choice(x,y,z) {return ((x & y) ^ (~x & z));}
function majority(x,y,z) {return ((x & y) ^ (x & z) ^ (y & z));}
function sha256_Sigma0(x) {return (rotateRight(2, x) ^ rotateRight(13, x) ^ rotateRight(22, x));}
function sha256_Sigma1(x) {return (rotateRight(6, x) ^ rotateRight(11, x) ^ rotateRight(25, x));}
function sha256_sigma0(x) {return (rotateRight(7, x) ^ rotateRight(18, x) ^ (x >>> 3));}
function sha256_sigma1(x) {return (rotateRight(17, x) ^ rotateRight(19, x) ^ (x >>> 10));}
function sha256_expand(W, j) {return (W[j&0x0f] += sha256_sigma1(W[(j+14)&0x0f]) + W[(j+9)&0x0f] + sha256_sigma0(W[(j+1)&0x0f]));}

var K256 = new Array(
	0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
	0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
	0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
	0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
	0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
	0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
	0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
	0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
	0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
	0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
	0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
	0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
	0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
	0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
	0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
	0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
);

var ihash, count, buffer;
var sha256_hex_digits = "0123456789abcdef";

function safe_add(x, y)
{
	var lsw = (x & 0xffff) + (y & 0xffff);
	var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
	return (msw << 16) | (lsw & 0xffff);
}

function sha256_init() {
	ihash = new Array(8);
	count = new Array(2);
	buffer = new Array(64);
	count[0] = count[1] = 0;
	ihash[0] = 0x6a09e667;
	ihash[1] = 0xbb67ae85;
	ihash[2] = 0x3c6ef372;
	ihash[3] = 0xa54ff53a;
	ihash[4] = 0x510e527f;
	ihash[5] = 0x9b05688c;
	ihash[6] = 0x1f83d9ab;
	ihash[7] = 0x5be0cd19;
}

function sha256_transform() {
	var a, b, c, d, e, f, g, h, T1, T2;
	var W = new Array(16);

	a = ihash[0];
	b = ihash[1];
	c = ihash[2];
	d = ihash[3];
	e = ihash[4];
	f = ihash[5];
	g = ihash[6];
	h = ihash[7];

	for(var i=0; i<16; i++)
		W[i] = ((buffer[(i<<2)+3]) | (buffer[(i<<2)+2] << 8) | (buffer[(i<<2)+1] << 16) | (buffer[i<<2] << 24));

        for(var j=0; j<64; j++) {
		T1 = h + sha256_Sigma1(e) + choice(e, f, g) + K256[j];
		if(j < 16) T1 += W[j];
		else T1 += sha256_expand(W, j);
		T2 = sha256_Sigma0(a) + majority(a, b, c);
		h = g;
		g = f;
		f = e;
		e = safe_add(d, T1);
		d = c;
		c = b;
		b = a;
		a = safe_add(T1, T2);
        }

	ihash[0] += a;
	ihash[1] += b;
	ihash[2] += c;
	ihash[3] += d;
	ihash[4] += e;
	ihash[5] += f;
	ihash[6] += g;
	ihash[7] += h;
}

function sha256_update(data, inputLen) {
	var i, index, curpos = 0;
	index = ((count[0] >> 3) & 0x3f);
        var remainder = (inputLen & 0x3f);

	if ((count[0] += (inputLen << 3)) < (inputLen << 3)) count[1]++;
	count[1] += (inputLen >> 29);

	for(i=0; i+63<inputLen; i+=64) {
                for(var j=index; j<64; j++)
			buffer[j] = data.charCodeAt(curpos++);
		sha256_transform();
		index = 0;
	}

	for(var j=0; j<remainder; j++)
		buffer[j] = data.charCodeAt(curpos++);
}

function sha256_final() {
	var index = ((count[0] >> 3) & 0x3f);
        buffer[index++] = 0x80;
        if(index <= 56) {
		for(var i=index; i<56; i++)
			buffer[i] = 0;
        } else {
		for(var i=index; i<64; i++)
			buffer[i] = 0;
                sha256_transform();
                for(var i=0; i<56; i++)
			buffer[i] = 0;
	}
        buffer[56] = (count[1] >>> 24) & 0xff;
        buffer[57] = (count[1] >>> 16) & 0xff;
        buffer[58] = (count[1] >>> 8) & 0xff;
        buffer[59] = count[1] & 0xff;
        buffer[60] = (count[0] >>> 24) & 0xff;
        buffer[61] = (count[0] >>> 16) & 0xff;
        buffer[62] = (count[0] >>> 8) & 0xff;
        buffer[63] = count[0] & 0xff;
        sha256_transform();
}

function sha256_encode_bytes() {
        var j=0;
        var output = new Array(32);
	for(var i=0; i<8; i++) {
		output[j++] = ((ihash[i] >>> 24) & 0xff);
		output[j++] = ((ihash[i] >>> 16) & 0xff);
		output[j++] = ((ihash[i] >>> 8) & 0xff);
		output[j++] = (ihash[i] & 0xff);
	}
	return output;
}

function sha256_encode_hex() {
	var output = new String();
	for(var i=0; i<8; i++) {
		for(var j=28; j>=0; j-=4)
			output += sha256_hex_digits.charAt((ihash[i] >>> j) & 0x0f);
	}
	return output;
}
function SHA256(data) {
   return sha256_digest(data);
}
function sha256_digest(data) {
	sha256_init();
	sha256_update(data, data.length);
	sha256_final();
   return sha256_encode_hex();
}

function sha256_self_test(){return sha256_digest("message digest") == "f7846f55cf23e14eebeab5b4e1550cad5b509e3348fbc4efa3a1413d393cb650";}
function drawSHA256(inpSHA,oID){
   $e(oID).innerHTML = inpSHA;
}