javascript md5 encryption code_javascript skills

]<script> var hex_chr = "0123456789abcdef"; function rhex(num) { str = ""; for(j = 0; j <= 3; j++) str += hex_chr.charAt((num >> (j * 8 + 4)) & 0x0F) + hex_chr.charAt((num >> (j * 8)) & 0x0F); return str; } function str2blks_MD5(str) { nblk = ((str.length + 8) >> 6) + 1; blks = new Array(nblk * 16); for(i = 0; i < nblk * 16; i++) blks[i] = 0; for(i = 0; i < str.length; i++) blks[i >> 2] |= str.charCodeAt(i) << ((i % 4) * 8); blks[i >> 2] |= 0x80 << ((i % 4) * 8); blks[nblk * 16 - 2] = str.length * 8; return blks; } function add(x, y) { var lsw = (x & 0xFFFF) + (y & 0xFFFF); var msw = (x >> 16) + (y >> 16) + (lsw >> 16); return (msw << 16) | (lsw & 0xFFFF); } function rol(num, cnt) { return (num << cnt) | (num >>> (32 - cnt)); } function cmn(q, a, b, x, s, t) { return add(rol(add(add(a, q), add(x, t)), s), b); } function ff(a, b, c, d, x, s, t) { return cmn((b & c) | ((~b) & d), a, b, x, s, t); } function gg(a, b, c, d, x, s, t) { return cmn((b & d) | (c & (~d)), a, b, x, s, t); } function hh(a, b, c, d, x, s, t) { return cmn(b ^ c ^ d, a, b, x, s, t); } function ii(a, b, c, d, x, s, t) { return cmn(c ^ (b | (~d)), a, b, x, s, t); } function MD5(str) { x = str2blks_MD5(str); var a = 1732584193; var b = -271733879; var c = -1732584194; var d = 271733878; for(i = 0; i < x.length; i += 16) { var olda = a; var oldb = b; var oldc = c; var oldd = d; a = ff(a, b, c, d, x[i+ 0], 7 , -680876936); d = ff(d, a, b, c, x[i+ 1], 12, -389564586); c = ff(c, d, a, b, x[i+ 2], 17, 606105819); b = ff(b, c, d, a, x[i+ 3], 22, -1044525330); a = ff(a, b, c, d, x[i+ 4], 7 , -176418897); d = ff(d, a, b, c, x[i+ 5], 12, 1200080426); c = ff(c, d, a, b, x[i+ 6], 17, -1473231341); b = ff(b, c, d, a, x[i+ 7], 22, -45705983); a = ff(a, b, c, d, x[i+ 8], 7 , 1770035416); d = ff(d, a, b, c, x[i+ 9], 12, -1958414417); c = ff(c, d, a, b, x[i+10], 17, -42063); b = ff(b, c, d, a, x[i+11], 22, -1990404162); a = ff(a, b, c, d, x[i+12], 7 , 1804603682); d = ff(d, a, b, c, x[i+13], 12, -40341101); c = ff(c, d, a, b, x[i+14], 17, -1502002290); b = ff(b, c, d, a, x[i+15], 22, 1236535329); a = gg(a, b, c, d, x[i+ 1], 5 , -165796510); d = gg(d, a, b, c, x[i+ 6], 9 , -1069501632); c = gg(c, d, a, b, x[i+11], 14, 643717713); b = gg(b, c, d, a, x[i+ 0], 20, -373897302); a = gg(a, b, c, d, x[i+ 5], 5 , -701558691); d = gg(d, a, b, c, x[i+10], 9 , 38016083); c = gg(c, d, a, b, x[i+15], 14, -660478335); b = gg(b, c, d, a, x[i+ 4], 20, -405537848); a = gg(a, b, c, d, x[i+ 9], 5 , 568446438); d = gg(d, a, b, c, x[i+14], 9 , -1019803690); c = gg(c, d, a, b, x[i+ 3], 14, -187363961); b = gg(b, c, d, a, x[i+ 8], 20, 1163531501); a = gg(a, b, c, d, x[i+13], 5 , -1444681467); d = gg(d, a, b, c, x[i+ 2], 9 , -51403784); c = gg(c, d, a, b, x[i+ 7], 14, 1735328473); b = gg(b, c, d, a, x[i+12], 20, -1926607734); a = hh(a, b, c, d, x[i+ 5], 4 , -378558); d = hh(d, a, b, c, x[i+ 8], 11, -2022574463); c = hh(c, d, a, b, x[i+11], 16, 1839030562); b = hh(b, c, d, a, x[i+14], 23, -35309556); a = hh(a, b, c, d, x[i+ 1], 4 , -1530992060); d = hh(d, a, b, c, x[i+ 4], 11, 1272893353); c = hh(c, d, a, b, x[i+ 7], 16, -155497632); b = hh(b, c, d, a, x[i+10], 23, -1094730640); a = hh(a, b, c, d, x[i+13], 4 , 681279174); d = hh(d, a, b, c, x[i+ 0], 11, -358537222); c = hh(c, d, a, b, x[i+ 3], 16, -722521979); b = hh(b, c, d, a, x[i+ 6], 23, 76029189); a = hh(a, b, c, d, x[i+ 9], 4 , -640364487); d = hh(d, a, b, c, x[i+12], 11, -421815835); c = hh(c, d, a, b, x[i+15], 16, 530742520); b = hh(b, c, d, a, x[i+ 2], 23, -995338651); a = ii(a, b, c, d, x[i+ 0], 6 , -198630844); d = ii(d, a, b, c, x[i+ 7], 10, 1126891415); c = ii(c, d, a, b, x[i+14], 15, -1416354905); b = ii(b, c, d, a, x[i+ 5], 21, -57434055); a = ii(a, b, c, d, x[i+12], 6 , 1700485571); d = ii(d, a, b, c, x[i+ 3], 10, -1894986606); c = ii(c, d, a, b, x[i+10], 15, -1051523); b = ii(b, c, d, a, x[i+ 1], 21, -2054922799); a = ii(a, b, c, d, x[i+ 8], 6 , 1873313359); d = ii(d, a, b, c, x[i+15], 10, -30611744); c = ii(c, d, a, b, x[i+ 6], 15, -1560198380); b = ii(b, c, d, a, x[i+13], 21, 1309151649); a = ii(a, b, c, d, x[i+ 4], 6 , -145523070); d = ii(d, a, b, c, x[i+11], 10, -1120210379); c = ii(c, d, a, b, x[i+ 2], 15, 718787259); b = ii(b, c, d, a, x[i+ 9], 21, -343485551); a = add(a, olda); b = add(b, oldb); c = add(c, oldc); d = add(d, oldd); } return rhex(a) + rhex(b) + rhex(c) + rhex(d); } alert(MD5("321")); </script>