JavaScript SHA256-UTF8 demo

This is a JavaScript implementation of SHA-256, aiming to be as small as I can make it. The goals are:

ASCII version currently only supports ASCII, so if you need to hash Unicode text you'll need to write a decoder.

Unicode (UTF-8) allowed. Using another script sha256_unicode.js:


Source code sha256_unicode.js (unicode 8-bit supporting) 
var sha256 = //BEGIN function as variable, like sha256.js. If this will be commented, comment ';' in the end of script.
//sha-256 function
function SHA256(s){ //s - string, unicode supporting.
 var chrsz  = 8;
 var hexcase = 0;
 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 S (X, n) { return ( X >>> n ) | (X << (32 - n)); }
 function R (X, n) { return ( X >>> n ); }
 function Ch(x, y, z) { return ((x & y) ^ ((~x) & z)); }
 function Maj(x, y, z) { return ((x & y) ^ (x & z) ^ (y & z)); }
 function Sigma0256(x) { return (S(x, 2) ^ S(x, 13) ^ S(x, 22)); }
 function Sigma1256(x) { return (S(x, 6) ^ S(x, 11) ^ S(x, 25)); }
 function Gamma0256(x) { return (S(x, 7) ^ S(x, 18) ^ R(x, 3)); }
 function Gamma1256(x) { return (S(x, 17) ^ S(x, 19) ^ R(x, 10)); }
 function core_sha256 (m, l) {
 var K = new Array(0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5, 0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5, 0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3, 0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174, 0xE49B69C1, 0xEFBE4786, 0xFC19DC6, 0x240CA1CC, 0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA, 0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7, 0xC6E00BF3, 0xD5A79147, 0x6CA6351, 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 HASH = new Array(0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19);
 var W = new Array(64);
 var a, b, c, d, e, f, g, h, i, j;
 var T1, T2;
 m[l >> 5] |= 0x80 << (24 - l % 32);
 m[((l + 64 >> 9) << 4) + 15] = l;
 for ( var i = 0; i>5] |= (str.charCodeAt(i / chrsz) & mask) << (24 - i%32);
 }
 return bin;
 }
 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;
 }
 function binb2hex (binarray) {
 var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
 var str = "";
 for(var i = 0; i < binarray.length * 4; i++) {
 str += hex_tab.charAt((binarray[i>>2] >> ((3 - i%4)*8+4)) & 0xF) +
 hex_tab.charAt((binarray[i>>2] >> ((3 - i%4)*8 )) & 0xF);
 }
 return str;
 }
 s = Utf8Encode(s);
 return binb2hex(core_sha256(str2binb(s), s.length * chrsz));
}
//test sha256 from specified 'string', by call this as function, withut variable
//document.write(SHA256('test_string_with_text. Unicode: 守护村子')); //show sha256 hash 00ad1ffe387a8e277b81ffa0211c41a67e4580839ed785eea84b751a9e4be546
	;	//END function as variable. Delete this ';' if variable not used.
//test sha256 from specified 'string', by calling this as function binded to variable name
//document.write(sha256('test_string_with_text. Unicode: 守护村子')); //show sha256 hash 00ad1ffe387a8e277b81ffa0211c41a67e4580839ed785eea84b751a9e4be546