可以处理UTF-8编码的md5函数

转自：http://www.lougoo.com/blog/article.asp?id=805

最近做一个项目时，发现网上流传的as2.0的md5函数，要不然只能使用ASCII编码，不要然就是unicode编码

都不能按UTF-8的编码进行加密，所以一遇到md5中文的话，md5的结果的会与服务器按UTF-8的编码算出的数据不一致。

今天终于在国外网站找到一个可以按UTF-8进行md5的函数，分享给大家

function md5(string) { var x = Array(); var k, AA, BB, CC, DD, a, b, c, d; var S11 = 7, S12 = 12, S13 = 17, S14 = 22; var S21 = 5, S22 = 9, S23 = 14, S24 = 20; var S31 = 4, S32 = 11, S33 = 16, S34 = 23; var S41 = 6, S42 = 10, S43 = 15, S44 = 21; string = Utf8Encode(string); x = ConvertToWordArray(string); a = 0x67452301; b = 0xEFCDAB89; c = 0x98BADCFE; d = 0x10325476; for (k=0; k<x.length; k += 16) { AA = a; BB = b; CC = c; DD = d; a = FF(a, b, c, d, x[k+0], S11, 0xD76AA478); d = FF(d, a, b, c, x[k+1], S12, 0xE8C7B756); c = FF(c, d, a, b, x[k+2], S13, 0x242070DB); b = FF(b, c, d, a, x[k+3], S14, 0xC1BDCEEE); a = FF(a, b, c, d, x[k+4], S11, 0xF57C0FAF); d = FF(d, a, b, c, x[k+5], S12, 0x4787C62A); c = FF(c, d, a, b, x[k+6], S13, 0xA8304613); b = FF(b, c, d, a, x[k+7], S14, 0xFD469501); a = FF(a, b, c, d, x[k+8], S11, 0x698098D8); d = FF(d, a, b, c, x[k+9], S12, 0x8B44F7AF); c = FF(c, d, a, b, x[k+10], S13, 0xFFFF5BB1); b = FF(b, c, d, a, x[k+11], S14, 0x895CD7BE); a = FF(a, b, c, d, x[k+12], S11, 0x6B901122); d = FF(d, a, b, c, x[k+13], S12, 0xFD987193); c = FF(c, d, a, b, x[k+14], S13, 0xA679438E); b = FF(b, c, d, a, x[k+15], S14, 0x49B40821); a = GG(a, b, c, d, x[k+1], S21, 0xF61E2562); d = GG(d, a, b, c, x[k+6], S22, 0xC040B340); c = GG(c, d, a, b, x[k+11], S23, 0x265E5A51); b = GG(b, c, d, a, x[k+0], S24, 0xE9B6C7AA); a = GG(a, b, c, d, x[k+5], S21, 0xD62F105D); d = GG(d, a, b, c, x[k+10], S22, 0x2441453); c = GG(c, d, a, b, x[k+15], S23, 0xD8A1E681); b = GG(b, c, d, a, x[k+4], S24, 0xE7D3FBC8); a = GG(a, b, c, d, x[k+9], S21, 0x21E1CDE6); d = GG(d, a, b, c, x[k+14], S22, 0xC33707D6); c = GG(c, d, a, b, x[k+3], S23, 0xF4D50D87); b = GG(b, c, d, a, x[k+8], S24, 0x455A14ED); a = GG(a, b, c, d, x[k+13], S21, 0xA9E3E905); d = GG(d, a, b, c, x[k+2], S22, 0xFCEFA3F8); c = GG(c, d, a, b, x[k+7], S23, 0x676F02D9); b = GG(b, c, d, a, x[k+12], S24, 0x8D2A4C8A); a = HH(a, b, c, d, x[k+5], S31, 0xFFFA3942); d = HH(d, a, b, c, x[k+8], S32, 0x8771F681); c = HH(c, d, a, b, x[k+11], S33, 0x6D9D6122); b = HH(b, c, d, a, x[k+14], S34, 0xFDE5380C); a = HH(a, b, c, d, x[k+1], S31, 0xA4BEEA44); d = HH(d, a, b, c, x[k+4], S32, 0x4BDECFA9); c = HH(c, d, a, b, x[k+7], S33, 0xF6BB4B60); b = HH(b, c, d, a, x[k+10], S34, 0xBEBFBC70); a = HH(a, b, c, d, x[k+13], S31, 0x289B7EC6); d = HH(d, a, b, c, x[k+0], S32, 0xEAA127FA); c = HH(c, d, a, b, x[k+3], S33, 0xD4EF3085); b = HH(b, c, d, a, x[k+6], S34, 0x4881D05); a = HH(a, b, c, d, x[k+9], S31, 0xD9D4D039); d = HH(d, a, b, c, x[k+12], S32, 0xE6DB99E5); c = HH(c, d, a, b, x[k+15], S33, 0x1FA27CF8); b = HH(b, c, d, a, x[k+2], S34, 0xC4AC5665); a = II(a, b, c, d, x[k+0], S41, 0xF4292244); d = II(d, a, b, c, x[k+7], S42, 0x432AFF97); c = II(c, d, a, b, x[k+14], S43, 0xAB9423A7); b = II(b, c, d, a, x[k+5], S44, 0xFC93A039); a = II(a, b, c, d, x[k+12], S41, 0x655B59C3); d = II(d, a, b, c, x[k+3], S42, 0x8F0CCC92); c = II(c, d, a, b, x[k+10], S43, 0xFFEFF47D); b = II(b, c, d, a, x[k+1], S44, 0x85845DD1); a = II(a, b, c, d, x[k+8], S41, 0x6FA87E4F); d = II(d, a, b, c, x[k+15], S42, 0xFE2CE6E0); c = II(c, d, a, b, x[k+6], S43, 0xA3014314); b = II(b, c, d, a, x[k+13], S44, 0x4E0811A1); a = II(a, b, c, d, x[k+4], S41, 0xF7537E82); d = II(d, a, b, c, x[k+11], S42, 0xBD3AF235); c = II(c, d, a, b, x[k+2], S43, 0x2AD7D2BB); b = II(b, c, d, a, x[k+9], S44, 0xEB86D391); a = AddUnsigned(a, AA); b = AddUnsigned(b, BB); c = AddUnsigned(c, CC); d = AddUnsigned(d, DD); } var temp = WordToHex(a)+WordToHex(b)+WordToHex(c)+WordToHex(d); return temp.toUpperCase(); } function RotateLeft(lValue, iShiftBits) { return (lValue << iShiftBits) | (lValue >>> (32-iShiftBits)); } function AddUnsigned(lX, lY) { var lX4, lY4, lX8, lY8, lResult; lX8 = (lX & 0x80000000); lY8 = (lY & 0x80000000); lX4 = (lX & 0x40000000); lY4 = (lY & 0x40000000); lResult = (lX & 0x3FFFFFFF)+(lY & 0x3FFFFFFF); if (lX4 & lY4) { return (lResult ^ 0x80000000 ^ lX8 ^ lY8); } if (lX4 | lY4) { if (lResult & 0x40000000) { return (lResult ^ 0xC0000000 ^ lX8 ^ lY8); } else { return (lResult ^ 0x40000000 ^ lX8 ^ lY8); } } else { return (lResult ^ lX8 ^ lY8); } } function F(x, y, z) { return (x & y) | ((~x) & z); } function G(x, y, z) { return (x & z) | (y & (~z)); } function H(x, y, z) { return (x ^ y ^ z); } function I(x, y, z) { return (y ^ (x | (~z))); } function FF(a, b, c, d, x, s, ac) { a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac)); return AddUnsigned(RotateLeft(a, s), b); } function GG(a, b, c, d, x, s, ac) { a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac)); return AddUnsigned(RotateLeft(a, s), b); } function HH(a, b, c, d, x, s, ac) { a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac)); return AddUnsigned(RotateLeft(a, s), b); } function II(a, b, c, d, x, s, ac) { a = AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac)); return AddUnsigned(RotateLeft(a, s), b); } function ConvertToWordArray(string) { var lWordCount; var lMessageLength = string.length; var lNumberOfWords_temp1 = lMessageLength+8; var lNumberOfWords_temp2 = (lNumberOfWords_temp1-(lNumberOfWords_temp1%64))/64; var lNumberOfWords = (lNumberOfWords_temp2+1)*16; var lWordArray = Array(lNumberOfWords-1); var lBytePosition = 0; var lByteCount = 0; while (lByteCount<lMessageLength) { lWordCount = (lByteCount-(lByteCount%4))/4; lBytePosition = (lByteCount%4)*8; lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount) << lBytePosition)); lByteCount++; } lWordCount = (lByteCount-(lByteCount%4))/4; lBytePosition = (lByteCount%4)*8; lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80 << lBytePosition); lWordArray[lNumberOfWords-2] = lMessageLength << 3; lWordArray[lNumberOfWords-1] = lMessageLength >>> 29; return lWordArray; } function WordToHex(lValue) { var WordToHexValue = "", WordToHexValue_temp = "", lByte, lCount; for (lCount=0; lCount<=3; lCount++) { lByte = (lValue >>> (lCount*8)) & 255; WordToHexValue_temp = "0"+lByte.toString(16); WordToHexValue = WordToHexValue+WordToHexValue_temp.substr(WordToHexValue_temp.length-2, 2); } return WordToHexValue; } function Utf8Encode(string) { 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; }