3des加密解密

var key = “123” //设置的秘钥
var Info =“test” //内容
DES3.encrypt(key,Info);
DES3.decrypt(key,Info);

引入3des.js,具体内容为以下：

/** 
 * 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） 
 */
//des http://www.cnblogs.com/bullub/archive/2013/05/02/3054798.html
//this takes the key, the message, and whether to encrypt or decrypt
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 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 (0x208,0x8020200,0,0x8020008,0x8000200,0,0x20208,0x8000200,0x20008,0x8000008,0x8000008,0x20000,0x8020208,0x20008,0x8020000,0x208,0x8000000,0x8,0x8020200,0x200,0x20200,0x8020000,0x8020008,0x20208,0x8000208,0x20200,0x20000,0x8000208,0x8,0x8020208,0x200,0x8000000,0x8020200,0x8000000,0x20008,0x208,0x20000,0x8020200,0x8000200,0,0x200,0x20008,0x8020208,0x8000200,0x8000008,0x200,0,0x8020008,0x8000208,0x20000,0x8000000,0x8020208,0x8,0x20208,0x20200,0x8000008,0x8020000,0x8000208,0x208,0x8020000,0x20208,0x8,0x8020008,0x20200);
    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 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++) << 8) | message.charCodeAt(m++);
 
        //for Cipher Block Chaining mode, xor the message with the previous result
        if (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 IP
        temp = ((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 message
        for (j=0; j<iterations; j+=3) {
            endloop = looping[j+1];
            loopinc = looping[j+2];
            //now go through and perform the encryption or decryption
            for (i=looping[j]; i!=endloop; i+=loopinc) { //for efficiency
                right1 = right ^ keys[i];
                right2 = ((right >>> 4) | (right << 28)) ^ keys[i+1];
                //the result is attained by passing these bytes through the S selection functions
                temp = 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 right
        left = ((left >>> 1) | (left << 31));
        right = ((right >>> 1) | (right << 31));
 
        //now perform IP-1, which is IP in the opposite direction
        temp = ((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 result
        if (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 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) && (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 bit
    var 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 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++) << 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 side
        temp = (left << 8) | ((right >>> 20) & 0x000000f0);
        //left needs to be put upside down
        left = (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 keys
        for (var i=0; i < shifts.length; i++) {
            //shift the keys either one or two bits to the left
            if (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, S7
            lefttemp = 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 created
    return keys;
} //end of des_createKeys
function 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 = '/ECB/PKCS5Padding';
var DES3 = {
    //3DES加密，CBC/PKCS5Padding
    encrypt:function(key,input){
        var genKey = genkey(key, 0, 24);
        return btoa(des(genKey.key, input, 1, 0, des3iv, 1));
    },
    3DES解密，CBC/PKCS5Padding
    decrypt:function(key,input){
        var genKey = genkey(key, 0, 24); 
        return des(genKey.key, atob(input), 0, 0, des3iv, 1); 
    }
};