DES加密算法js实现

DES 加密算法 1） 该函数接受一个 8 字节字符串作为普通 DES 算法的密钥（也就是 64 位，但是算法只使用 56 位），或者接受一个 24 字节字符串作为 3DES 2） 算法的密钥；第二个参数是要加密或解密的信息字符串；第三个布尔值参数用来说明信息是加密还是解密；接下来的可选参数 mode 如果是 0 表示 ECB 3）模式，1 表示 CBC 模式，默认是 ECB 模式；最后一个可选项是一个 8 字节的输入向量字符串（在 ECB 模式下不使用）。返回的密文是字符串。 4） 参数：* key: 8字节字符串作为普通 DES 算法的密钥,或 24 字节字符串作为 3DES * message： 加密或解密的信息字符串* encrypt: 布尔值参数用来说明信息是加密还是解密* mode: 1:CBC模式，0:ECB模式(默认)* iv: 可选项，初始化向量* padding: 可选项, 8字节的输入向量字符串（在 ECB 模式下不使用）

des.js代码

function des (key, message, encrypt, mode, iv, padding) {if(encrypt) //如果是加密的话，首先转换编码message = unescape(encodeURIComponent(message));//declaring this locally speeds things up a bitvar spfunction1 = new Array (0x1010400,0,0x10000,0x1010404,0x1010004,0x10404,0x4,0x10000,0x400,0x1010400,0x1010404,0x400,0x1000404,0x1010004,0x1000000,0x4,0x404,0x1000400,0x1000400,0x10400,0x10400,0x1010000,0x1010000,0x1000404,0x10004,0x1000004,0x1000004,0x10004,0,0x404,0x10404,0x1000000,0x10000,0x1010404,0x4,0x1010000,0x1010400,0x1000000,0x1000000,0x400,0x1010004,0x10000,0x10400,0x1000004,0x400,0x4,0x1000404,0x10404,0x1010404,0x10004,0x1010000,0x1000404,0x1000004,0x404,0x10404,0x1010400,0x404,0x1000400,0x1000400,0,0x10004,0x10400,0,0x1010004);var spfunction2 = new Array (-0x7fef7fe0,-0x7fff8000,0x8000,0x108020,0x100000,0x20,-0x7fefffe0,-0x7fff7fe0,-0x7fffffe0,-0x7fef7fe0,-0x7fef8000,-0x80000000,-0x7fff8000,0x100000,0x20,-0x7fefffe0,0x108000,0x100020,-0x7fff7fe0,0,-0x80000000,0x8000,0x108020,-0x7ff00000,0x100020,-0x7fffffe0,0,0x108000,0x8020,-0x7fef8000,-0x7ff00000,0x8020,0,0x108020,-0x7fefffe0,0x100000,-0x7fff7fe0,-0x7ff00000,-0x7fef8000,0x8000,-0x7ff00000,-0x7fff8000,0x20,-0x7fef7fe0,0x108020,0x20,0x8000,-0x80000000,0x8020,-0x7fef8000,0x100000,-0x7fffffe0,0x100020,-0x7fff7fe0,-0x7fffffe0,0x100020,0x108000,0,-0x7fff8000,0x8020,-0x80000000,-0x7fefffe0,-0x7fef7fe0,0x108000);var spfunction3 = new Array (0x208,0x8020200,0,0x8020008,0x8000200,0,0x20208,0x8000200,0x20008,0x8000008,0x8000008,0x20000,0x8020208,0x20008,0x8020000,0x208,0x8000000,0x8,0x8020200,0x200,0x20200,0x8020000,0x8020008,0x20208,0x8000208,0x20200,0x20000,0x8000208,0x8,0x8020208,0x200,0x8000000,0x8020200,0x8000000,0x20008,0x208,0x20000,0x8020200,0x8000200,0,0x200,0x20008,0x8020208,0x8000200,0x8000008,0x200,0,0x8020008,0x8000208,0x20000,0x8000000,0x8020208,0x8,0x20208,0x20200,0x8000008,0x8020000,0x8000208,0x208,0x8020000,0x20208,0x8,0x8020008,0x20200);var spfunction4 = new Array (0x802001,0x2081,0x2081,0x80,0x802080,0x800081,0x800001,0x2001,0,0x802000,0x802000,0x802081,0x81,0,0x800080,0x800001,0x1,0x2000,0x800000,0x802001,0x80,0x800000,0x2001,0x2080,0x800081,0x1,0x2080,0x800080,0x2000,0x802080,0x802081,0x81,0x800080,0x800001,0x802000,0x802081,0x81,0,0,0x802000,0x2080,0x800080,0x800081,0x1,0x802001,0x2081,0x2081,0x80,0x802081,0x81,0x1,0x2000,0x800001,0x2001,0x802080,0x800081,0x2001,0x2080,0x800000,0x802001,0x80,0x800000,0x2000,0x802080);var spfunction5 = new Array (0x100,0x2080100,0x2080000,0x42000100,0x80000,0x100,0x40000000,0x2080000,0x40080100,0x80000,0x2000100,0x40080100,0x42000100,0x42080000,0x80100,0x40000000,0x2000000,0x40080000,0x40080000,0,0x40000100,0x42080100,0x42080100,0x2000100,0x42080000,0x40000100,0,0x42000000,0x2080100,0x2000000,0x42000000,0x80100,0x80000,0x42000100,0x100,0x2000000,0x40000000,0x2080000,0x42000100,0x40080100,0x2000100,0x40000000,0x42080000,0x2080100,0x40080100,0x100,0x2000000,0x42080000,0x42080100,0x80100,0x42000000,0x42080100,0x2080000,0,0x40080000,0x42000000,0x80100,0x2000100,0x40000100,0x80000,0,0x40080000,0x2080100,0x40000100);var spfunction6 = new Array (0x20000010,0x20400000,0x4000,0x20404010,0x20400000,0x10,0x20404010,0x400000,0x20004000,0x404010,0x400000,0x20000010,0x400010,0x20004000,0x20000000,0x4010,0,0x400010,0x20004010,0x4000,0x404000,0x20004010,0x10,0x20400010,0x20400010,0,0x404010,0x20404000,0x4010,0x404000,0x20404000,0x20000000,0x20004000,0x10,0x20400010,0x404000,0x20404010,0x400000,0x4010,0x20000010,0x400000,0x20004000,0x20000000,0x4010,0x20000010,0x20404010,0x404000,0x20400000,0x404010,0x20404000,0,0x20400010,0x10,0x4000,0x20400000,0x404010,0x4000,0x400010,0x20004010,0,0x20404000,0x20000000,0x400010,0x20004010);var spfunction7 = new Array (0x200000,0x4200002,0x4000802,0,0x800,0x4000802,0x200802,0x4200800,0x4200802,0x200000,0,0x4000002,0x2,0x4000000,0x4200002,0x802,0x4000800,0x200802,0x200002,0x4000800,0x4000002,0x4200000,0x4200800,0x200002,0x4200000,0x800,0x802,0x4200802,0x200800,0x2,0x4000000,0x200800,0x4000000,0x200800,0x200000,0x4000802,0x4000802,0x4200002,0x4200002,0x2,0x200002,0x4000000,0x4000800,0x200000,0x4200800,0x802,0x200802,0x4200800,0x802,0x4000002,0x4200802,0x4200000,0x200800,0,0x2,0x4200802,0,0x200802,0x4200000,0x800,0x4000002,0x4000800,0x800,0x200002);var spfunction8 = new Array (0x10001040,0x1000,0x40000,0x10041040,0x10000000,0x10001040,0x40,0x10000000,0x40040,0x10040000,0x10041040,0x41000,0x10041000,0x41040,0x1000,0x40,0x10040000,0x10000040,0x10001000,0x1040,0x41000,0x40040,0x10040040,0x10041000,0x1040,0,0,0x10040040,0x10000040,0x10001000,0x41040,0x40000,0x41040,0x40000,0x10041000,0x1000,0x40,0x10040040,0x1000,0x41040,0x10001000,0x40,0x10000040,0x10040000,0x10040040,0x10000000,0x40000,0x10001040,0,0x10041040,0x40040,0x10000040,0x10040000,0x10001000,0x10001040,0,0x10041040,0x41000,0x41000,0x1040,0x1040,0x40040,0x10000000,0x10041000);//create the 16 or 48 subkeys we will needvar keys = des_createKeys (key);var m=0, i, j, temp, temp2, right1, right2, left, right, looping;var cbcleft, cbcleft2, cbcright, cbcright2var endloop, loopinc;var len = message.length;var chunk = 0;//set up the loops for single and triple desvar iterations = keys.length == 32 ? 3 : 9; //single or triple desif (iterations == 3) {looping = encrypt ? new Array (0, 32, 2) : new Array (30, -2, -2);}else {looping = encrypt ? new Array (0, 32, 2, 62, 30, -2, 64, 96, 2) : new Array (94, 62, -2, 32, 64, 2, 30, -2, -2);}//pad the message depending on the padding parameterif (padding == 2) message += "    "; //pad the message with spaceselse if (padding == 1) {if(encrypt) {temp = 8-(len%8);message += String.fromCharCode(temp,temp,temp,temp,temp,temp,temp,temp);if (temp===8) len+=8;}} //PKCS7 paddingelse if (!padding) message += "\0\0\0\0\0\0\0\0"; //pad the message out with null bytes//store the result herevar result = "";var tempresult = "";if (mode == 1) { //CBC modecbcleft = (iv.charCodeAt(m++) << 24) | (iv.charCodeAt(m++) << 16) | (iv.charCodeAt(m++) << 8) | iv.charCodeAt(m++);cbcright = (iv.charCodeAt(m++) << 24) | (iv.charCodeAt(m++) << 16) | (iv.charCodeAt(m++) << 8) | iv.charCodeAt(m++);m=0;}//loop through each 64 bit chunk of the messagewhile (m < len) {left = (message.charCodeAt(m++) << 24) | (message.charCodeAt(m++) << 16) | (message.charCodeAt(m++) << 8) | message.charCodeAt(m++);right = (message.charCodeAt(m++) << 24) | (message.charCodeAt(m++) << 16) | (message.charCodeAt(m++) << 8) | message.charCodeAt(m++);//for Cipher Block Chaining mode, xor the message with the previous resultif (mode == 1) {if (encrypt) {left ^= cbcleft; right ^= cbcright;} else {cbcleft2 = cbcleft; cbcright2 = cbcright; cbcleft = left; cbcright = right;}}//first each 64 but chunk of the message must be permuted according to IPtemp = ((left >>> 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp << 4);temp = ((left >>> 16) ^ right) & 0x0000ffff; right ^= temp; left ^= (temp << 16);temp = ((right >>> 2) ^ left) & 0x33333333; left ^= temp; right ^= (temp << 2);temp = ((right >>> 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp << 8);temp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1);left = ((left << 1) | (left >>> 31));right = ((right << 1) | (right >>> 31));//do this either 1 or 3 times for each chunk of the messagefor (j=0; j<iterations; j+=3) {endloop = looping[j+1];loopinc = looping[j+2];//now go through and perform the encryption or decryptionfor (i=looping[j]; i!=endloop; i+=loopinc) { //for efficiencyright1 = right ^ keys[i];right2 = ((right >>> 4) | (right << 28)) ^ keys[i+1];//the result is attained by passing these bytes through the S selection functionstemp = left;left = right;right = temp ^ (spfunction2[(right1 >>> 24) & 0x3f] | spfunction4[(right1 >>> 16) & 0x3f]| spfunction6[(right1 >>> 8) & 0x3f] | spfunction8[right1 & 0x3f]| spfunction1[(right2 >>> 24) & 0x3f] | spfunction3[(right2 >>> 16) & 0x3f]| spfunction5[(right2 >>> 8) & 0x3f] | spfunction7[right2 & 0x3f]);}temp = left; left = right; right = temp; //unreverse left and right} //for either 1 or 3 iterations//move then each one bit to the rightleft = ((left >>> 1) | (left << 31));right = ((right >>> 1) | (right << 31));//now perform IP-1, which is IP in the opposite directiontemp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1);temp = ((right >>> 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp << 8);temp = ((right >>> 2) ^ left) & 0x33333333; left ^= temp; right ^= (temp << 2);temp = ((left >>> 16) ^ right) & 0x0000ffff; right ^= temp; left ^= (temp << 16);temp = ((left >>> 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp << 4);//for Cipher Block Chaining mode, xor the message with the previous resultif (mode == 1) {if (encrypt) {cbcleft = left; cbcright = right;} else {left ^= cbcleft2; right ^= cbcright2;}}tempresult += String.fromCharCode ((left>>>24), ((left>>>16) & 0xff), ((left>>>8) & 0xff), (left & 0xff), (right>>>24), ((right>>>16) & 0xff), ((right>>>8) & 0xff), (right & 0xff));chunk += 8;if (chunk == 512) {result += tempresult; tempresult = ""; chunk = 0;}} //for every 8 characters, or 64 bits in the message//return the result as an arrayresult += tempresult;result = result.replace(/\0*$/g, "");if(!encrypt ) { //如果是解密的话，解密结束后对PKCS7 padding进行解码，并转换成utf-8编码if(padding === 1) { //PKCS7 padding解码var len = result.length, paddingChars = 0;len && (paddingChars = result.charCodeAt(len-1));(paddingChars <= 8) && (result = result.substring(0, len - paddingChars));}//转换成UTF-8编码result = decodeURIComponent(escape(result));}return result;
} //end of des
//des_createKeys
//this takes as input a 64 bit key (even though only 56 bits are used)
//as an array of 2 integers, and returns 16 48 bit keys
function des_createKeys (key) {//declaring this locally speeds things up a bitvar pc2bytes0 = new Array (0,0x4,0x20000000,0x20000004,0x10000,0x10004,0x20010000,0x20010004,0x200,0x204,0x20000200,0x20000204,0x10200,0x10204,0x20010200,0x20010204);var pc2bytes1 = new Array (0,0x1,0x100000,0x100001,0x4000000,0x4000001,0x4100000,0x4100001,0x100,0x101,0x100100,0x100101,0x4000100,0x4000101,0x4100100,0x4100101);var pc2bytes2 = new Array (0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808,0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808);var pc2bytes3 = new Array (0,0x200000,0x8000000,0x8200000,0x2000,0x202000,0x8002000,0x8202000,0x20000,0x220000,0x8020000,0x8220000,0x22000,0x222000,0x8022000,0x8222000);var pc2bytes4 = new Array (0,0x40000,0x10,0x40010,0,0x40000,0x10,0x40010,0x1000,0x41000,0x1010,0x41010,0x1000,0x41000,0x1010,0x41010);var pc2bytes5 = new Array (0,0x400,0x20,0x420,0,0x400,0x20,0x420,0x2000000,0x2000400,0x2000020,0x2000420,0x2000000,0x2000400,0x2000020,0x2000420);var pc2bytes6 = new Array (0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002,0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002);var pc2bytes7 = new Array (0,0x10000,0x800,0x10800,0x20000000,0x20010000,0x20000800,0x20010800,0x20000,0x30000,0x20800,0x30800,0x20020000,0x20030000,0x20020800,0x20030800);var pc2bytes8 = new Array (0,0x40000,0,0x40000,0x2,0x40002,0x2,0x40002,0x2000000,0x2040000,0x2000000,0x2040000,0x2000002,0x2040002,0x2000002,0x2040002);var pc2bytes9 = new Array (0,0x10000000,0x8,0x10000008,0,0x10000000,0x8,0x10000008,0x400,0x10000400,0x408,0x10000408,0x400,0x10000400,0x408,0x10000408);var pc2bytes10 = new Array (0,0x20,0,0x20,0x100000,0x100020,0x100000,0x100020,0x2000,0x2020,0x2000,0x2020,0x102000,0x102020,0x102000,0x102020);var pc2bytes11 = new Array (0,0x1000000,0x200,0x1000200,0x200000,0x1200000,0x200200,0x1200200,0x4000000,0x5000000,0x4000200,0x5000200,0x4200000,0x5200000,0x4200200,0x5200200);var pc2bytes12 = new Array (0,0x1000,0x8000000,0x8001000,0x80000,0x81000,0x8080000,0x8081000,0x10,0x1010,0x8000010,0x8001010,0x80010,0x81010,0x8080010,0x8081010);var pc2bytes13 = new Array (0,0x4,0x100,0x104,0,0x4,0x100,0x104,0x1,0x5,0x101,0x105,0x1,0x5,0x101,0x105);//how many iterations (1 for des, 3 for triple des)var iterations = key.length > 8 ? 3 : 1; //changed by Paul 16/6/2007 to use Triple DES for 9+ byte keys//stores the return keysvar keys = new Array (32 * iterations);//now define the left shifts which need to be donevar shifts = new Array (0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0);//other variablesvar lefttemp, righttemp, m=0, n=0, temp;for (var j=0; j<iterations; j++) { //either 1 or 3 iterationsvar left = (key.charCodeAt(m++) << 24) | (key.charCodeAt(m++) << 16) | (key.charCodeAt(m++) << 8) | key.charCodeAt(m++);var right = (key.charCodeAt(m++) << 24) | (key.charCodeAt(m++) << 16) | (key.charCodeAt(m++) << 8) | key.charCodeAt(m++);temp = ((left >>> 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp << 4);temp = ((right >>> -16) ^ left) & 0x0000ffff; left ^= temp; right ^= (temp << -16);temp = ((left >>> 2) ^ right) & 0x33333333; right ^= temp; left ^= (temp << 2);temp = ((right >>> -16) ^ left) & 0x0000ffff; left ^= temp; right ^= (temp << -16);temp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1);temp = ((right >>> 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp << 8);temp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1);//the right side needs to be shifted and to get the last four bits of the left sidetemp = (left << 8) | ((right >>> 20) & 0x000000f0);//left needs to be put upside downleft = (right << 24) | ((right << 8) & 0xff0000) | ((right >>> 8) & 0xff00) | ((right >>> 24) & 0xf0);right = temp;//now go through and perform these shifts on the left and right keysfor (var i=0; i < shifts.length; i++) {//shift the keys either one or two bits to the leftif (shifts[i]) {left = (left << 2) | (left >>> 26); right = (right << 2) | (right >>> 26);}else {left = (left << 1) | (left >>> 27); right = (right << 1) | (right >>> 27);}left &= -0xf; right &= -0xf;//now apply PC-2, in such a way that E is easier when encrypting or decrypting//this conversion will look like PC-2 except only the last 6 bits of each byte are used//rather than 48 consecutive bits and the order of lines will be according to//how the S selection functions will be applied: S2, S4, S6, S8, S1, S3, S5, S7lefttemp = pc2bytes0[left >>> 28] | pc2bytes1[(left >>> 24) & 0xf]| pc2bytes2[(left >>> 20) & 0xf] | pc2bytes3[(left >>> 16) & 0xf]| pc2bytes4[(left >>> 12) & 0xf] | pc2bytes5[(left >>> 8) & 0xf]| pc2bytes6[(left >>> 4) & 0xf];righttemp = pc2bytes7[right >>> 28] | pc2bytes8[(right >>> 24) & 0xf]| pc2bytes9[(right >>> 20) & 0xf] | pc2bytes10[(right >>> 16) & 0xf]| pc2bytes11[(right >>> 12) & 0xf] | pc2bytes12[(right >>> 8) & 0xf]| pc2bytes13[(right >>> 4) & 0xf];temp = ((righttemp >>> 16) ^ lefttemp) & 0x0000ffff;keys[n++] = lefttemp ^ temp; keys[n++] = righttemp ^ (temp << 16);}} //for each iterations//return the keys we've createdreturn keys;
} //end of des_createKeys
function genkey(key, start, end) {//8 byte / 64 bit Key (DES) or 192 bit Keyreturn {key:pad(key.slice(start, end)),vector: 1};
}
function pad(key) {for (var i = key.length; i<24; i++) {key+="0";}return key;
}
var des3iv = '12345678';
var DES3 = {//3DES加密，CBC/PKCS5Paddingencrypt:function(key,input){var genKey = genkey(key, 0, 24);return btoa(des(genKey.key, input, 1, 1, des3iv, 1));},3DES解密，CBC/PKCS5Paddingdecrypt:function(key,input){var genKey = genkey(key, 0, 24); return des(genKey.key, atob(input), 0, 1, des3iv, 1); }
};

在HTML中测试


<head><title>www.jb51.net BASE64编码</title><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><script type="text/javascript" src="./des.js"></script><script type="text/javascript" src="./Base64.js"></script>
</head>
<body>
<script type="text/javascript">
var str = "trr Why are you so cute?";
document.write("真实数据:  "+str);//var base64 = BASE64.encoder(str);//返回编码后的字符
//document.write("</br>BASE64后:</br>"+base64);
//var unicode= BASE64.decoder(base64);//返回会解码后的字符串。
//document.write("</br>还原:</br>"+unicode);function getRandomCode(length) {if (length > 0) {var data = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"];var nums = "";for (var i = 0; i < length; i++) {var r = parseInt(Math.random() * 61);nums += data[r];}return nums;} else {return false;}
}var key = getRandomCode(26);
var des3en = DES3.encrypt(key,str);
document.write("</br>des3加密后:  "+des3en);
document.write("</br>des3解密后:  "+DES3.decrypt(key,des3en));</script>
</body>

运行结果：

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<信息安全技术>这门课又在讲 DES 加密算法了,以前用纯C写过一次,这次我用 C++ 重新写了一个,写篇文章以备后用.本文介绍了 DES 算法加密的大致步骤和整体流程. 一.DES算法原 ...
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