前端加密MD5
Posted zhaoxinran997
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今天接触了MD5加密方式，记录一下使用方法，又去搜了搜关于MD5的详细内容
1、下载MD5模块 cnpm install md5 -S 2、引入模块 const md5 = require("md5") 3、加密 const str = "12345"; console.log(md5(str))；
1.MD5介绍
MD5是MD5消息摘要算法的简称（英语：MD5 Message-Digest Algorithm），是一种广泛使用的密码散列函数，可以产生出一个128位（16字节）的散列值（即哈希值），用于确保信息传输的完整性。MD5由罗纳德·李维斯特设计，于1992年公开，用以取代MD4算法。这套算法的程序在RFC 1321 中被加以规范。将数据（如一段文字）运算变为另一固定长度值，是散列算法的基础原理。MD5已经被证实可以被碰撞破解。对于需要高度安全性的数据，专家一般建议改用其他算法，如SHA-2。
2.js加密的好处
（1）用js对私密信息加密可避免在网络中传输明文信息,被人截取数据包而造成数据泄露。
（2）避免缓存中自动缓存密码。比如在使用谷歌浏览器登陆时,输入的用户名和密码会自动缓存,下次登陆时无需输入密码就可以实现登陆,这样就给别人留下漏洞,当别人用你电脑登陆或把input的type改为test 那么你的密码就泄露了.使用js加密时,缓存的加密后的密文,用密文做密码登陆是不成功的,即使泄露也是泄露的密文,对密码不会造成威胁，缺点是每次登陆时都要手动输入密码，较麻烦。
（3）使用js加密,减少了服务器加密时的资源消耗,从理论上提高了服务器的性能。为了安全,很有必要再做服务器端的加密.无论从理论还是实际,两道门比一道门要安全些.至少给攻击者造成了一个障碍。
jquery.md5.js插件代码：
/** * 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(/x0dx0a/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);
使用方法
$.(md5("你想要加密的字符串"));
附上MD5 破解网站：https://www.cmd5.com/ （简单的可以破解，复杂的不能破解）
后来又搜到前端加密方式有很多，可以看看这位博主的文章 https://blog.csdn.net/doulinxu/article/details/60766242 ， 写的很详细！
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