JS实现3des+base64加密解密算法步骤详解

web前端|js教程

3des+base64,javascript,加密解密

web前端-js教程1. index.html：

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var str = "网址：";document.write("原始字符串:"+str);var base64 = BASE64.encoder(str);//返回编码后的字符document.write("BASE64后:"+base64);//alert(base64);var unicode= BASE64.decoder(base64);//返回会解码后的字符串。//alert(unicode);document.write("还原:"+unicode);//var str= "你好123hello";var key = "qXSdHWfbSZaaLeHBRhLgxBiG";//alert(decrypt_3des);var des3en = DES3.encrypt(key,str);document.write("des3加密:"+des3en);document.write("des3解密:"+DES3.decrypt(key,des3en));

2. DES3.js文件：

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/** * DES 加密算法 * * 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 * 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 * 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。 * * 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:

* padding: 可选项, 8字节的输入向量字符串（在 ECB 模式下不使用） *///this takes the key, the message, and whether to encrypt or decryptfunction 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 bit var 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 (0x208,0x800,0,0x8020008,0x8000200,0,0x8,0x8000200,0x20008,0x8000008,0x8000008,0x20000,0x808,0x20008,0x8020000,0x208,0x8000000,0x8,0x800,0x200,0x0,0x8020000,0x8020008,0x8,0x8000208,0x0,0x20000,0x8000208,0x8,0x808,0x200,0x8000000,0x800,0x8000000,0x20008,0x208,0x20000,0x800,0x8000200,0,0x200,0x20008,0x808,0x8000200,0x8000008,0x200,0,0x8020008,0x8000208,0x20000,0x8000000,0x808,0x8,0x8,0x0,0x8000008,0x8020000,0x8000208,0x208,0x8020000,0x8,0x8,0x8020008,0x0); 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 (0x200000,0x4200002,0x4000802,0,0x800,0x4000802,0x02,0x400,0x402,0x200000,0,0x4000002,0x2,0x4000000,0x4200002,0x802,0x4000800,0x02,0x200002,0x4000800,0x4000002,0x4200000,0x400,0x200002,0x4200000,0x800,0x802,0x402,0x00,0x2,0x4000000,0x00,0x4000000,0x00,0x200000,0x4000802,0x4000802,0x4200002,0x4200002,0x2,0x200002,0x4000000,0x4000800,0x200000,0x400,0x802,0x02,0x400,0x802,0x4000002,0x402,0x4200000,0x00,0,0x2,0x402,0,0x02,0x4200000,0x800,0x4000002,0x4000800,0x800,0x200002); 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 need var keys = des_createKeys (key); var m=0, i, j, temp, temp2, right1, right2, left, right, looping; var cbcleft, cbcleft2, cbcright, cbcright2 var endloop, loopinc; var len = message.length; var chunk = 0; //set up the loops for single and triple des var iterations = keys.length == 32 ? 3 : 9; //single or triple des if (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 parameter if (padding == 2) message += " "; //pad the message with spaces else 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 padding else if (!padding) message += "\0\0\0\0\0\0\0\0"; //pad the message out with null bytes //store the result here var result = ""; var tempresult = ""; if (mode == 1) { //CBC mode cbcleft = (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 message while (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++) <>> 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp <>> 16) ^ right) & 0x0000ffff; right ^= temp; left ^= (temp <>> 2) ^ left) & 0x33333333; left ^= temp; right ^= (temp <>> 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp <>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1); left = ((left <>> 31)); right = ((right <>> 31)); //do this either 1 or 3 times for each chunk of the message for (j=0; j>> 4) | (right <>> 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 right left = ((left >>> 1) | (left <>> 1) | (right <>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp <>> 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp <>> 2) ^ left) & 0x33333333; left ^= temp; right ^= (temp <>> 16) ^ right) & 0x0000ffff; right ^= temp; left ^= (temp <>> 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp <>>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 array result += 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 ? 3 : 1; //changed by Paul 16/6/ to use Triple DES for 9+ byte keys //stores the return keys var keys = new Array (32 * iterations); //now define the left shifts which need to be done var shifts = new Array (0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0); //other variables var lefttemp, righttemp, m=0, n=0, temp; for (var j=0; j<iterations; j++) { //either 1 or 3 iterations var 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++) <>> 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp <>> -16) ^ left) & 0x0000ffff; left ^= temp; right ^= (temp <>> 2) ^ right) & 0x33333333; right ^= temp; left ^= (temp <>> -16) ^ left) & 0x0000ffff; left ^= temp; right ^= (temp <>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp <>> 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp <>> 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 side temp = (left <>> 20) & 0x000000f0); //left needs to be put upside down left = (right << 24) | ((right <>> 8) & 0xff00) | ((right >>> 24) & 0xf0); right = temp; //now go through and perform these shifts on the left and right keys for (var i=0; i < shifts.length; i++) {//shift the keys either one or two bits to the leftif (shifts[i]) {left = (left <>> 26); right = (right <>> 26);}else {left = (left <>> 27); right = (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 weve created return keys;} //end of des_createKeysfunction genkey(key, start, end) { //8 byte / 64 bit Key (DES) or 192 bit Key return {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/PKCS5Padding encrypt:function(key,input){ var genKey = genkey(key, 0, 24); return btoa(des(genKey.key, input, 1, 1, des3iv, 1)); }, ////3DES解密，CBC/PKCS5Padding decrypt:function(key,input){ var genKey = genkey(key, 0, 24);return des(genKey.key, atob(input), 0, 1, des3iv, 1); }};

3. Base64.js文件：

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/** *create by 7月9日 http://javascript.css-/ *BASE64 Encode and Decode By UTF-8 unicode *可以和java的BASE64编码和解码互相转化 */ var BASE64_MAPPING = [ 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,,a,,c,d,e,f, g,h,i,j,k,l,m, , o,p,q, ,s, ,u,v, w,x,y,z,,1,2,3, 4,5,6,7,8,9,+,/ ]; /** *ascii convert to binary */ var _toBinary = function(ascii){ var binary = new Array(); while(ascii > 0){var b = ascii%2;ascii = Math.floor(ascii/2);binary.push(b); } /* var len = binary.length; if(6-len > 0){for(var i = 6-len ; i > 0 ; --i){ binary.push(0);} }*/ binary.reverse(); return binary; }; /** *binary convert to decimal */ var _toDecimal = function(binary){ var dec = 0; var p = 0; for(var i = binary.length-1 ; i >= 0 ; --i){var b = binary[i];if(b == 1){ dec += Math.pow(2 , p);}++p; } return dec; }; /** *unicode convert to utf-8 */ var _toUTF8Binary = function(c , binaryArray){ var mustLen = (8-(c+1)) + ((c-1)*6); var fatLen = binaryArray.length; var diff = mustLen - fatLen; while(--diff >= 0){binaryArray.unshift(0); } var binary = []; var _c = c; while(--_c >= 0){binary.push(1); } binary.push(0); var i = 0 , len = 8 - (c+1); for(; i < len ; ++i){binary.push(binaryArray[i]); } for(var j = 0 ; j = 0){ binary.push(binaryArray[i++]);} } return binary; }; var BASE64 = {/** *BASE64 Encode */encoder:function(str){ var base64_Index = []; var binaryArray = []; for(var i = 0 , len = str.length ; i < len ; ++i){var unicode = str.charCodeAt(i);var _tmpBinary = _toBinary(unicode);if(unicode = 0){ _tmpBinary.unshift(0); } binaryArray = binaryArray.concat(_tmpBinary);}else if(unicode >= 0x80 && unicode = 0x800 && unicode = 0x10000 && unicode = 0x200000 && unicode = 4000000 && unicode <= 0x7FFFFFFF){//UTF-8 6byte binaryArray = binaryArray.concat(_toUTF8Binary(6 , _tmpBinary));} } var extra_Zero_Count = 0; for(var i = 0 , len = binaryArray.length ; i 0){// len += extra_Zero_Count+1;//}var _tmpExtra_Zero_Count = extra_Zero_Count;while(--_tmpExtra_Zero_Count >= 0){ binaryArray.push(0);}base64_Index.push(_toDecimal(binaryArray.slice(i , i+6))); } var base64 = \; for(var i = 0 , len = base64_Index.length ; i < len ; ++i){base64 += BASE64_MAPPING[base64_Index[i]]; } for(var i = 0 , len = extra_Zero_Count/2 ; i < len ; ++i){base64 += =; } return base64;},/** *BASE64 Decode for UTF-8 */decoder : function(_base64Str){ var _len = _base64Str.length; var extra_Zero_Count = 0; /** *计算在进行BASE64编码的时候，补了几个0 */ if(_base64Str.charAt(_len-1) == =){//alert(_base64Str.charAt(_len-1));//alert(_base64Str.charAt(_len-2));if(_base64Str.charAt(_len-2) == =){//两个等号说明补了4个0 extra_Zero_Count = 4; _base64Str = _base64Str.substring(0 , _len-2);}else{//一个等号说明补了2个0 extra_Zero_Count = 2; _base64Str = _base64Str.substring(0 , _len - 1);} } var binaryArray = []; for(var i = 0 , len = _base64Str.length; i < len ; ++i){var c = _base64Str.charAt(i);for(var j = 0 , size = BASE64_MAPPING.length ; j 0){for(var k = 6-_tmpLen ; k > 0 ; --k){ _tmp.unshift(0);} } binaryArray = binaryArray.concat(_tmp); break; }} } if(extra_Zero_Count > 0){binaryArray = binaryArray.slice(0 , binaryArray.length - extra_Zero_Count); } var unicode = []; var unicodeBinary = []; for(var i = 0 , len = binaryArray.length ; i < len ; ){if(binaryArray[i] == 0){ unicode=unicode.concat(_toDecimal(binaryArray.slice(i,i+8))); i += 8;}else{ var sum = 0; while(i 1){ unicodeBinary = unicodeBinary.concat(binaryArray.slice(i+2 , i+8)); i += 8; --sum; } unicode = unicode.concat(_toDecimal(unicodeBinary)); unicodeBinary = [];} } //---------直接转换为结果 var strResult = \; for(var i = 0 , len = unicode.length ; i < len ;++i){ strResult += String.fromCharCode(unicode[i]); } return strResult;} };

运行结果：