MD5加密处理

无论传送过程和存储方式，都是以明文的方式，很不安全！一旦泄漏，将会造成很大的损失！

插件名称jQuery.MD5.js：

    /**
     * jQuery MD5 hash algorithm function
     *
     *     <code>
     *         Calculate the md5 hash of a String
     *         String $.md5 ( String str )
     *     </code>
     *
     * Calculates the MD5 hash of str using the » RSA Data Security, Inc. MD5 Message-Digest Algorithm, and returns that hash.
     * MD5 (Message-Digest algorithm 5) is a widely-used cryptographic hash function with a 128-bit hash value. MD5 has been employed in a wide variety of security applications, and is also commonly used to check the integrity of data. The generated hash is also non-reversable. Data cannot be retrieved from the message digest, the digest uniquely identifies the data.
     * MD5 was developed by Professor Ronald L. Rivest in 1994. Its 128 bit (16 byte) message digest makes it a faster implementation than SHA-1.
     * This script is used to process a variable length message into a fixed-length output of 128 bits using the MD5 algorithm. It is fully compatible with UTF-8 encoding. It is very useful when u want to transfer encrypted passwords over the internet. If you plan using UTF-8 encoding in your project don't forget to set the page encoding to UTF-8 (Content-Type meta tag).
     * This function orginally get from the WebToolkit and rewrite for using as the jQuery plugin.
     *
     * Example
     *     Code
     *         <code>
     *             $.md5("I'm Persian.");
     *         </code>
     *     Result
     *         <code>
     *             "b8c901d0f02223f9761016cfff9d68df"
     *         </code>
     *
     * @alias Muhammad Hussein Fattahizadeh < muhammad [AT] semnanweb [DOT] com >
     * @link http://www.semnanweb.com/jquery-plugin/md5.html
     * @see http://www.webtoolkit.info/
     * @license http://www.gnu.org/licenses/gpl.html [GNU General Public License]
     * @param {jQuery} {md5:function(string))
     * @return string
     */
    (function($){
        var rotateLeft = function(lValue, iShiftBits) {
            return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits));
        }
        var addUnsigned = function(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);
            }
        }
        var F = function(x, y, z) {
            return (x & y) | ((~ x) & z);
        }
        var G = function(x, y, z) {
            return (x & z) | (y & (~ z));
        }
        var H = function(x, y, z) {
            return (x ^ y ^ z);
        }
        var I = function(x, y, z) {
            return (y ^ (x | (~ z)));
        }
        var FF = function(a, b, c, d, x, s, ac) {
            a = addUnsigned(a, addUnsigned(addUnsigned(F(b, c, d), x), ac));
            return addUnsigned(rotateLeft(a, s), b);
        };
        var GG = function(a, b, c, d, x, s, ac) {
            a = addUnsigned(a, addUnsigned(addUnsigned(G(b, c, d), x), ac));
            return addUnsigned(rotateLeft(a, s), b);
        };
        var HH = function(a, b, c, d, x, s, ac) {
            a = addUnsigned(a, addUnsigned(addUnsigned(H(b, c, d), x), ac));
            return addUnsigned(rotateLeft(a, s), b);
        };
        var II = function(a, b, c, d, x, s, ac) {
            a = addUnsigned(a, addUnsigned(addUnsigned(I(b, c, d), x), ac));
            return addUnsigned(rotateLeft(a, s), b);
        };
        var convertToWordArray = function(string) {
            var lWordCount;
            var lMessageLength = string.length;
            var lNumberOfWordsTempOne = lMessageLength + 8;
            var lNumberOfWordsTempTwo = (lNumberOfWordsTempOne - (lNumberOfWordsTempOne % 64)) / 64;
            var lNumberOfWords = (lNumberOfWordsTempTwo + 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;
        };
        var wordToHex = function(lValue) {
            var WordToHexValue = "", WordToHexValueTemp = "", lByte, lCount;
            for (lCount = 0; lCount <= 3; lCount++) {
                lByte = (lValue >>> (lCount * 8)) & 255;
                WordToHexValueTemp = "0" + lByte.toString(16);
                WordToHexValue = WordToHexValue + WordToHexValueTemp.substr(WordToHexValueTemp.length - 2, 2);
            }
            return WordToHexValue;
        };
        var uTF8Encode = function(string) {
            string = string.replace(/\x0d\x0a/g, "\x0a");
            var output = "";
            for (var n = 0; n < string.length; n++) {
                var c = string.charCodeAt(n);
                if (c < 128) {
                    output += String.fromCharCode(c);
                } else if ((c > 127) && (c < 2048)) {
                    output += String.fromCharCode((c >> 6) | 192);
                    output += String.fromCharCode((c & 63) | 128);
                } else {
                    output += String.fromCharCode((c >> 12) | 224);
                    output += String.fromCharCode(((c >> 6) & 63) | 128);
                    output += String.fromCharCode((c & 63) | 128);
                }
            }
            return output;
        };
        $.extend({
            md5: function(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 tempValue = wordToHex(a) + wordToHex(b) + wordToHex(c) + wordToHex(d);
                return tempValue.toLowerCase();
            }
        });
    })(jQuery);

适用方法：var a=$.MD5("1231231231");

他是不可逆的！不可解密！

更多加密方式：

前台MD5加密后，后台再一次MD5加密。

MD5Class.GetMD5(context.Request.Form["pwd"],32);

可以再加入自己的密码，再MD5：加盐处理

MD5Class.GetMD5(context.Request.Form["pwd"]+"今夜打老虎",32);

C#    MD5Class：