加密技术-des前后台加密

js代码：

/**
* DES加密/解密
* @Copyright Copyright (c) 2006
* @author Guapo
* @see DESCore
*/

/*
* encrypt the string to string made up of hex
* return the encrypted string
*/
function strEnc(data,firstKey,secondKey,thirdKey){

var leng = data.length;
var encData = "";
var firstKeyBt,secondKeyBt,thirdKeyBt,firstLength,secondLength,thirdLength;
if(firstKey != null && firstKey != ""){
firstKeyBt = getKeyBytes(firstKey);
firstLength = firstKeyBt.length;
}
if(secondKey != null && secondKey != ""){
secondKeyBt = getKeyBytes(secondKey);
secondLength = secondKeyBt.length;
}
if(thirdKey != null && thirdKey != ""){
thirdKeyBt = getKeyBytes(thirdKey);
thirdLength = thirdKeyBt.length;
}

if(leng > 0){
if(leng < 4){
var bt = strToBt(data);
var encByte ;
if(firstKey != null && firstKey !="" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != ""){
var tempBt;
var x,y,z;
tempBt = bt;
for(x = 0;x < firstLength ;x ++){
tempBt = enc(tempBt,firstKeyBt[x]);
}
for(y = 0;y < secondLength ;y ++){
tempBt = enc(tempBt,secondKeyBt[y]);
}
for(z = 0;z < thirdLength ;z ++){
tempBt = enc(tempBt,thirdKeyBt[z]);
}
encByte = tempBt;
}else{
if(firstKey != null && firstKey !="" && secondKey != null && secondKey != ""){
var tempBt;
var x,y;
tempBt = bt;
for(x = 0;x < firstLength ;x ++){
tempBt = enc(tempBt,firstKeyBt[x]);
}
for(y = 0;y < secondLength ;y ++){
tempBt = enc(tempBt,secondKeyBt[y]);
}
encByte = tempBt;
}else{
if(firstKey != null && firstKey !=""){
var tempBt;
var x = 0;
tempBt = bt;
for(x = 0;x < firstLength ;x ++){
tempBt = enc(tempBt,firstKeyBt[x]);
}
encByte = tempBt;
}
}
}
encData = bt64ToHex(encByte);
}else{
var iterator = parseInt(leng/4);
var remainder = leng%4;
var i=0;
for(i = 0;i < iterator;i++){
var tempData = data.substring(i*4+0,i*4+4);
var tempByte = strToBt(tempData);
var encByte ;
if(firstKey != null && firstKey !="" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != ""){
var tempBt;
var x,y,z;
tempBt = tempByte;
for(x = 0;x < firstLength ;x ++){
tempBt = enc(tempBt,firstKeyBt[x]);
}
for(y = 0;y < secondLength ;y ++){
tempBt = enc(tempBt,secondKeyBt[y]);
}
for(z = 0;z < thirdLength ;z ++){
tempBt = enc(tempBt,thirdKeyBt[z]);
}
encByte = tempBt;
}else{
if(firstKey != null && firstKey !="" && secondKey != null && secondKey != ""){
var tempBt;
var x,y;
tempBt = tempByte;
for(x = 0;x < firstLength ;x ++){
tempBt = enc(tempBt,firstKeyBt[x]);
}
for(y = 0;y < secondLength ;y ++){
tempBt = enc(tempBt,secondKeyBt[y]);
}
encByte = tempBt;
}else{
if(firstKey != null && firstKey !=""){
var tempBt;
var x;
tempBt = tempByte;
for(x = 0;x < firstLength ;x ++){
tempBt = enc(tempBt,firstKeyBt[x]);
}
encByte = tempBt;
}
}
}
encData += bt64ToHex(encByte);
}
if(remainder > 0){
var remainderData = data.substring(iterator*4+0,leng);
var tempByte = strToBt(remainderData);
var encByte ;
if(firstKey != null && firstKey !="" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != ""){
var tempBt;
var x,y,z;
tempBt = tempByte;
for(x = 0;x < firstLength ;x ++){
tempBt = enc(tempBt,firstKeyBt[x]);
}
for(y = 0;y < secondLength ;y ++){
tempBt = enc(tempBt,secondKeyBt[y]);
}
for(z = 0;z < thirdLength ;z ++){
tempBt = enc(tempBt,thirdKeyBt[z]);
}
encByte = tempBt;
}else{
if(firstKey != null && firstKey !="" && secondKey != null && secondKey != ""){
var tempBt;
var x,y;
tempBt = tempByte;
for(x = 0;x < firstLength ;x ++){
tempBt = enc(tempBt,firstKeyBt[x]);
}
for(y = 0;y < secondLength ;y ++){
tempBt = enc(tempBt,secondKeyBt[y]);
}
encByte = tempBt;
}else{
if(firstKey != null && firstKey !=""){
var tempBt;
var x;
tempBt = tempByte;
for(x = 0;x < firstLength ;x ++){
tempBt = enc(tempBt,firstKeyBt[x]);
}
encByte = tempBt;
}
}
}
encData += bt64ToHex(encByte);
}
}
}
return encData;
}

/*
* decrypt the encrypted string to the original string
*
* return the original string
*/
function strDec(data,firstKey,secondKey,thirdKey){
var leng = data.length;
var decStr = "";
var firstKeyBt,secondKeyBt,thirdKeyBt,firstLength,secondLength,thirdLength;
if(firstKey != null && firstKey != ""){
firstKeyBt = getKeyBytes(firstKey);
firstLength = firstKeyBt.length;
}
if(secondKey != null && secondKey != ""){
secondKeyBt = getKeyBytes(secondKey);
secondLength = secondKeyBt.length;
}
if(thirdKey != null
1811e
&& thirdKey != ""){
thirdKeyBt = getKeyBytes(thirdKey);
thirdLength = thirdKeyBt.length;
}

var iterator = parseInt(leng/16);
var i=0;
for(i = 0;i < iterator;i++){
var tempData = data.substring(i*16+0,i*16+16);
var strByte = hexToBt64(tempData);
var intByte = new Array(64);
var j = 0;
for(j = 0;j < 64; j++){
intByte[j] = parseInt(strByte.substring(j,j+1));
}
var decByte;
if(firstKey != null && firstKey !="" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != ""){
var tempBt;
var x,y,z;
tempBt = intByte;
for(x = thirdLength - 1;x >= 0;x --){
tempBt = dec(tempBt,thirdKeyBt[x]);
}
for(y = secondLength - 1;y >= 0;y --){
tempBt = dec(tempBt,secondKeyBt[y]);
}
for(z = firstLength - 1;z >= 0 ;z --){
tempBt = dec(tempBt,firstKeyBt[z]);
}
decByte = tempBt;
}else{
if(firstKey != null && firstKey !="" && secondKey != null && secondKey != ""){
var tempBt;
var x,y,z;
tempBt = intByte;
for(x = secondLength - 1;x >= 0 ;x --){
tempBt = dec(tempBt,secondKeyBt[x]);
}
for(y = firstLength - 1;y >= 0 ;y --){
tempBt = dec(tempBt,firstKeyBt[y]);
}
decByte = tempBt;
}else{
if(firstKey != null && firstKey !=""){
var tempBt;
var x,y,z;
tempBt = intByte;
for(x = firstLength - 1;x >= 0 ;x --){
tempBt = dec(tempBt,firstKeyBt[x]);
}
decByte = tempBt;
}
}
}
decStr += byteToString(decByte);
}
return decStr;
}
/*
* chang the string into the bit array
*
* return bit array(it's length % 64 = 0)
*/
function getKeyBytes(key){
var keyBytes = new Array();
var leng = key.length;
var iterator = parseInt(leng/4);
var remainder = leng%4;
var i = 0;
for(i = 0;i < iterator; i ++){
keyBytes[i] = strToBt(key.substring(i*4+0,i*4+4));
}
if(remainder > 0){
keyBytes[i] = strToBt(key.substring(i*4+0,leng));
}
return keyBytes;
}

/*
* chang the string(it's length <= 4) into the bit array
*
* return bit array(it's length = 64)
*/
function strToBt(str){
var leng = str.length;
var bt = new Array(64);
if(leng < 4){
var i=0,j=0,p=0,q=0;
for(i = 0;i<leng;i++){
var k = str.charCodeAt(i);
for(j=0;j<16;j++){
var pow=1,m=0;
for(m=15;m>j;m--){
pow *= 2;
}
bt[16*i+j]=parseInt(k/pow)%2;
}
}
for(p = leng;p<4;p++){
var k = 0;
for(q=0;q<16;q++){
var pow=1,m=0;
for(m=15;m>q;m--){
pow *= 2;
}
bt[16*p+q]=parseInt(k/pow)%2;
}
}
}else{
for(i = 0;i<4;i++){
var k = str.charCodeAt(i);
for(j=0;j<16;j++){
var pow=1;
for(m=15;m>j;m--){
pow *= 2;
}
bt[16*i+j]=parseInt(k/pow)%2;
}
}
}
return bt;
}

/*
* chang the bit(it's length = 4) into the hex
*
* return hex
*/
function bt4ToHex(binary) {
var hex;
switch (binary) {
case "0000" : hex = "0"; break;
case "0001" : hex = "1"; break;
case "0010" : hex = "2"; break;
case "0011" : hex = "3"; break;
case "0100" : hex = "4"; break;
case "0101" : hex = "5"; break;
case "0110" : hex = "6"; break;
case "0111" : hex = "7"; break;
case "1000" : hex = "8"; break;
case "1001" : hex = "9"; break;
case "1010" : hex = "A"; break;
case "1011" : hex = "B"; break;
case "1100" : hex = "C"; break;
case "1101" : hex = "D"; break;
case "1110" : hex = "E"; break;
case "1111" : hex = "F"; break;
}
return hex;
}

/*
* chang the hex into the bit(it's length = 4)
*
* return the bit(it's length = 4)
*/
function hexToBt4(hex) {
var binary;
switch (hex) {
case "0" : binary = "0000"; break;
case "1" : binary = "0001"; break;
case "2" : binary = "0010"; break;
case "3" : binary = "0011"; break;
case "4" : binary = "0100"; break;
case "5" : binary = "0101"; break;
case "6" : binary = "0110"; break;
case "7" : binary = "0111"; break;
case "8" : binary = "1000"; break;
case "9" : binary = "1001"; break;
case "A" : binary = "1010"; break;
case "B" : binary = "1011"; break;
case "C" : binary = "1100"; break;
case "D" : binary = "1101"; break;
case "E" : binary = "1110"; break;
case "F" : binary = "1111"; break;
}
return binary;
}

/*
* chang the bit(it's length = 64) into the string
*
* return string
*/
function byteToString(byteData){
var str="";
for(i = 0;i<4;i++){
var count=0;
for(j=0;j<16;j++){
var pow=1;
for(m=15;m>j;m--){
pow*=2;
}
count+=byteData[16*i+j]*pow;
}
if(count != 0){
str+=String.fromCharCode(count);
}
}
return str;
}

function bt64ToHex(byteData){
var hex = "";
for(i = 0;i<16;i++){
var bt = "";
for(j=0;j<4;j++){
bt += byteData[i*4+j];
}
hex+=bt4ToHex(bt);
}
return hex;
}

function hexToBt64(hex){
var binary = "";
for(i = 0;i<16;i++){
binary+=hexToBt4(hex.substring(i,i+1));
}
return binary;
}

/*
* the 64 bit des core arithmetic
*/

function enc(dataByte,keyByte){
var keys = generateKeys(keyByte);
var ipByte = initPermute(dataByte);
var ipLeft = new Array(32);
var ipRight = new Array(32);
var tempLeft = new Array(32);
var i = 0,j = 0,k = 0,m = 0, n = 0;
for(k = 0;k < 32;k ++){
ipLeft[k] = ipByte[k];
ipRight[k] = ipByte[32+k];
}
for(i = 0;i < 16;i ++){
for(j = 0;j < 32;j ++){
tempLeft[j] = ipLeft[j];
ipLeft[j] = ipRight[j];
}
var key = new Array(48);
for(m = 0;m < 48;m ++){
key[m] = keys[i][m];
}
var tempRight = xor(pPermute(sBoxPermute(xor(expandPermute(ipRight),key))), tempLeft);
for(n = 0;n < 32;n ++){
ipRight
= tempRight
;
}

}

var finalData =new Array(64);
for(i = 0;i < 32;i ++){
finalData[i] = ipRight[i];
finalData[32+i] = ipLeft[i];
}
return finallyPermute(finalData);
}

function dec(dataByte,keyByte){
var keys = generateKeys(keyByte);
var ipByte = initPermute(dataByte);
var ipLeft = new Array(32);
var ipRight = new Array(32);
var tempLeft = new Array(32);
var i = 0,j = 0,k = 0,m = 0, n = 0;
for(k = 0;k < 32;k ++){
ipLeft[k] = ipByte[k];
ipRight[k] = ipByte[32+k];
}
for(i = 15;i >= 0;i --){
for(j = 0;j < 32;j ++){
tempLeft[j] = ipLeft[j];
ipLeft[j] = ipRight[j];
}
var key = new Array(48);
for(m = 0;m < 48;m ++){
key[m] = keys[i][m];
}

var tempRight = xor(pPermute(sBoxPermute(xor(expandPermute(ipRight),key))), tempLeft);
for(n = 0;n < 32;n ++){
ipRight
= tempRight
;
}
}

var finalData =new Array(64);
for(i = 0;i < 32;i ++){
finalData[i] = ipRight[i];
finalData[32+i] = ipLeft[i];
}
return finallyPermute(finalData);
}

function initPermute(originalData){
var ipByte = new Array(64);
for (i = 0, m = 1, n = 0; i < 4; i++, m += 2, n += 2) {
for (j = 7, k = 0; j >= 0; j--, k++) {
ipByte[i * 8 + k] = originalData[j * 8 + m];
ipByte[i * 8 + k + 32] = originalData[j * 8 + n];
}
}
return ipByte;
}

function expandPermute(rightData){
var epByte = new Array(48);
for (i = 0; i < 8; i++) {
if (i == 0) {
epByte[i * 6 + 0] = rightData[31];
} else {
epByte[i * 6 + 0] = rightData[i * 4 - 1];
}
epByte[i * 6 + 1] = rightData[i * 4 + 0];
epByte[i * 6 + 2] = rightData[i * 4 + 1];
epByte[i * 6 + 3] = rightData[i * 4 + 2];
epByte[i * 6 + 4] = rightData[i * 4 + 3];
if (i == 7) {
epByte[i * 6 + 5] = rightData[0];
} else {
epByte[i * 6 + 5] = rightData[i * 4 + 4];
}
}
return epByte;
}

function xor(byteOne,byteTwo){
var xorByte = new Array(byteOne.length);
for(i = 0;i < byteOne.length; i ++){
xorByte[i] = byteOne[i] ^ byteTwo[i];
}
return xorByte;
}

function sBoxPermute(expandByte){

var sBoxByte = new Array(32);
var binary = "";
var s1 = [
[14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7],
[0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8],
[4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0],
[15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13 ]];

/* Table - s2 */
var s2 = [
[15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10],
[3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5],
[0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15],
[13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9 ]];

/* Table - s3 */
var s3= [
[10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8],
[13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1],
[13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7],
[1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12 ]];
/* Table - s4 */
var s4 = [
[7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15],
[13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9],
[10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4],
[3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14 ]];

/* Table - s5 */
var s5 = [
[2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9],
[14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6],
[4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14],
[11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3 ]];

/* Table - s6 */
var s6 = [
[12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11],
[10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8],
[9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6],
[4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13 ]];

/* Table - s7 */
var s7 = [
[4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1],
[13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6],
[1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2],
[6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12]];

/* Table - s8 */
var s8 = [
[13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7],
[1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2],
[7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8],
[2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11]];

for(m=0;m<8;m++){
var i=0,j=0;
i = expandByte[m*6+0]*2+expandByte[m*6+5];
j = expandByte[m * 6 + 1] * 2 * 2 * 2
+ expandByte[m * 6 + 2] * 2* 2
+ expandByte[m * 6 + 3] * 2
+ expandByte[m * 6 + 4];
switch (m) {
case 0 :
binary = getBoxBinary(s1[i][j]);
break;
case 1 :
binary = getBoxBinary(s2[i][j]);
break;
case 2 :
binary = getBoxBinary(s3[i][j]);
break;
case 3 :
binary = getBoxBinary(s4[i][j]);
break;
case 4 :
binary = getBoxBinary(s5[i][j]);
break;
case 5 :
binary = getBoxBinary(s6[i][j]);
break;
case 6 :
binary = getBoxBinary(s7[i][j]);
break;
case 7 :
binary = getBoxBinary(s8[i][j]);
break;
}
sBoxByte[m*4+0] = parseInt(binary.substring(0,1));
sBoxByte[m*4+1] = parseInt(binary.substring(1,2));
sBoxByte[m*4+2] = parseInt(binary.substring(2,3));
sBoxByte[m*4+3] = parseInt(binary.substring(3,4));
}
return sBoxByte;
}

function pPermute(sBoxByte){
var pBoxPermute = new Array(32);
pBoxPermute[ 0] = sBoxByte[15];
pBoxPermute[ 1] = sBoxByte[ 6];
pBoxPermute[ 2] = sBoxByte[19];
pBoxPermute[ 3] = sBoxByte[20];
pBoxPermute[ 4] = sBoxByte[28];
pBoxPermute[ 5] = sBoxByte[11];
pBoxPermute[ 6] = sBoxByte[27];
pBoxPermute[ 7] = sBoxByte[16];
pBoxPermute[ 8] = sBoxByte[ 0];
pBoxPermute[ 9] = sBoxByte[14];
pBoxPermute[10] = sBoxByte[22];
pBoxPermute[11] = sBoxByte[25];
pBoxPermute[12] = sBoxByte[ 4];
pBoxPermute[13] = sBoxByte[17];
pBoxPermute[14] = sBoxByte[30];
pBoxPermute[15] = sBoxByte[ 9];
pBoxPermute[16] = sBoxByte[ 1];
pBoxPermute[17] = sBoxByte[ 7];
pBoxPermute[18] = sBoxByte[23];
pBoxPermute[19] = sBoxByte[13];
pBoxPermute[20] = sBoxByte[31];
pBoxPermute[21] = sBoxByte[26];
pBoxPermute[22] = sBoxByte[ 2];
pBoxPermute[23] = sBoxByte[ 8];
pBoxPermute[24] = sBoxByte[18];
pBoxPermute[25] = sBoxByte[12];
pBoxPermute[26] = sBoxByte[29];
pBoxPermute[27] = sBoxByte[ 5];
pBoxPermute[28] = sBoxByte[21];
pBoxPermute[29] = sBoxByte[10];
pBoxPermute[30] = sBoxByte[ 3];
pBoxPermute[31] = sBoxByte[24];
return pBoxPermute;
}

function finallyPermute(endByte){
var fpByte = new Array(64);
fpByte[ 0] = endByte[39];
fpByte[ 1] = endByte[ 7];
fpByte[ 2] = endByte[47];
fpByte[ 3] = endByte[15];
fpByte[ 4] = endByte[55];
fpByte[ 5] = endByte[23];
fpByte[ 6] = endByte[63];
fpByte[ 7] = endByte[31];
fpByte[ 8] = endByte[38];
fpByte[ 9] = endByte[ 6];
fpByte[10] = endByte[46];
fpByte[11] = endByte[14];
fpByte[12] = endByte[54];
fpByte[13] = endByte[22];
fpByte[14] = endByte[62];
fpByte[15] = endByte[30];
fpByte[16] = endByte[37];
fpByte[17] = endByte[ 5];
fpByte[18] = endByte[45];
fpByte[19] = endByte[13];
fpByte[20] = endByte[53];
fpByte[21] = endByte[21];
fpByte[22] = endByte[61];
fpByte[23] = endByte[29];
fpByte[24] = endByte[36];
fpByte[25] = endByte[ 4];
fpByte[26] = endByte[44];
fpByte[27] = endByte[12];
fpByte[28] = endByte[52];
fpByte[29] = endByte[20];
fpByte[30] = endByte[60];
fpByte[31] = endByte[28];
fpByte[32] = endByte[35];
fpByte[33] = endByte[ 3];
fpByte[34] = endByte[43];
fpByte[35] = endByte[11];
fpByte[36] = endByte[51];
fpByte[37] = endByte[19];
fpByte[38] = endByte[59];
fpByte[39] = endByte[27];
fpByte[40] = endByte[34];
fpByte[41] = endByte[ 2];
fpByte[42] = endByte[42];
fpByte[43] = endByte[10];
fpByte[44] = endByte[50];
fpByte[45] = endByte[18];
fpByte[46] = endByte[58];
fpByte[47] = endByte[26];
fpByte[48] = endByte[33];
fpByte[49] = endByte[ 1];
fpByte[50] = endByte[41];
fpByte[51] = endByte[ 9];
fpByte[52] = endByte[49];
fpByte[53] = endByte[17];
fpByte[54] = endByte[57];
fpByte[55] = endByte[25];
fpByte[56] = endByte[32];
fpByte[57] = endByte[ 0];
fpByte[58] = endByte[40];
fpByte[59] = endByte[ 8];
fpByte[60] = endByte[48];
fpByte[61] = endByte[16];
fpByte[62] = endByte[56];
fpByte[63] = endByte[24];
return fpByte;
}

function getBoxBinary(i) {
var binary = "";
switch (i) {
case 0 :binary = "0000";break;
case 1 :binary = "0001";break;
case 2 :binary = "0010";break;
case 3 :binary = "0011";break;
case 4 :binary = "0100";break;
case 5 :binary = "0101";break;
case 6 :binary = "0110";break;
case 7 :binary = "0111";break;
case 8 :binary = "1000";break;
case 9 :binary = "1001";break;
case 10 :binary = "1010";break;
case 11 :binary = "1011";break;
case 12 :binary = "1100";break;
case 13 :binary = "1101";break;
case 14 :binary = "1110";break;
case 15 :binary = "1111";break;
}
return binary;
}
/*
* generate 16 keys for xor
*
*/
function generateKeys(keyByte){
var key = new Array(56);
var keys = new Array();

keys[ 0] = new Array();
keys[ 1] = new Array();
keys[ 2] = new Array();
keys[ 3] = new Array();
keys[ 4] = new Array();
keys[ 5] = new Array();
keys[ 6] = new Array();
keys[ 7] = new Array();
keys[ 8] = new Array();
keys[ 9] = new Array();
keys[10] = new Array();
keys[11] = new Array();
keys[12] = new Array();
keys[13] = new Array();
keys[14] = new Array();
keys[15] = new Array();
var loop = [1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1];

for(i=0;i<7;i++){
for(j=0,k=7;j<8;j++,k--){
key[i*8+j]=keyByte[8*k+i];
}
}

var i = 0;
for(i = 0;i < 16;i ++){
var tempLeft=0;
var tempRight=0;
for(j = 0; j < loop[i];j ++){
tempLeft = key[0];
tempRight = key[28];
for(k = 0;k < 27 ;k ++){
key[k] = key[k+1];
key[28+k] = key[29+k];
}
key[27]=tempLeft;
key[55]=tempRight;
}
var tempKey = new Array(48);
tempKey[ 0] = key[13];
tempKey[ 1] = key[16];
tempKey[ 2] = key[10];
tempKey[ 3] = key[23];
tempKey[ 4] = key[ 0];
tempKey[ 5] = key[ 4];
tempKey[ 6] = key[ 2];
tempKey[ 7] = key[27];
tempKey[ 8] = key[14];
tempKey[ 9] = key[ 5];
tempKey[10] = key[20];
tempKey[11] = key[ 9];
tempKey[12] = key[22];
tempKey[13] = key[18];
tempKey[14] = key[11];
tempKey[15] = key[ 3];
tempKey[16] = key[25];
tempKey[17] = key[ 7];
tempKey[18] = key[15];
tempKey[19] = key[ 6];
tempKey[20] = key[26];
tempKey[21] = key[19];
tempKey[22] = key[12];
tempKey[23] = key[ 1];
tempKey[24] = key[40];
tempKey[25] = key[51];
tempKey[26] = key[30];
tempKey[27] = key[36];
tempKey[28] = key[46];
tempKey[29] = key[54];
tempKey[30] = key[29];
tempKey[31] = key[39];
tempKey[32] = key[50];
tempKey[33] = key[44];
tempKey[34] = key[32];
tempKey[35] = key[47];
tempKey[36] = key[43];
tempKey[37] = key[48];
tempKey[38] = key[38];
tempKey[39] = key[55];
tempKey[40] = key[33];
tempKey[41] = key[52];
tempKey[42] = key[45];
tempKey[43] = key[41];
tempKey[44] = key[49];
tempKey[45] = key[35];
tempKey[46] = key[28];
tempKey[47] = key[31];
switch(i){
case 0: for(m=0;m < 48 ;m++){ keys[ 0][m] = tempKey[m]; } break;
case 1: for(m=0;m < 48 ;m++){ keys[ 1][m] = tempKey[m]; } break;
case 2: for(m=0;m < 48 ;m++){ keys[ 2][m] = tempKey[m]; } break;
case 3: for(m=0;m < 48 ;m++){ keys[ 3][m] = tempKey[m]; } break;
case 4: for(m=0;m < 48 ;m++){ keys[ 4][m] = tempKey[m]; } break;
case 5: for(m=0;m < 48 ;m++){ keys[ 5][m] = tempKey[m]; } break;
case 6: for(m=0;m < 48 ;m++){ keys[ 6][m] = tempKey[m]; } break;
case 7: for(m=0;m < 48 ;m++){ keys[ 7][m] = tempKey[m]; } break;
case 8: for(m=0;m < 48 ;m++){ keys[ 8][m] = tempKey[m]; } break;
case 9: for(m=0;m < 48 ;m++){ keys[ 9][m] = tempKey[m]; } break;
case 10: for(m=0;m < 48 ;m++){ keys[10][m] = tempKey[m]; } break;
case 11: for(m=0;m < 48 ;m++){ keys[11][m] = tempKey[m]; } break;
case 12: for(m=0;m < 48 ;m++){ keys[12][m] = tempKey[m]; } break;
case 13: for(m=0;m < 48 ;m++){ keys[13][m] = tempKey[m]; } break;
case 14: for(m=0;m < 48 ;m++){ keys[14][m] = tempKey[m]; } break;
case 15: for(m=0;m < 48 ;m++){ keys[15][m] = tempKey[m]; } break;
}
}
return keys;
}
//end-------------------------------------------------------------------------------------------------------------
/*
function test() {

var msg = "abcdefgh";
var bt = strToBt(msg);

var key = "12345678";
var keyB = strToBt(key);

var encByte = enc(bt,keyB);

var enchex = bt64ToHex(encByte);
endata.value=enchex;

var encStr = hexToBt64(enchex);
alert("encStr="+encStr);
var eByte = new Array();
for(m=0;m<encStr.length;m++){
eByte[m] = parseInt(encStr.substring(m,m+1));
}
var decbyte= dec(eByte,keyB)
var decmsg= byteToString(decbyte);
alert("decbyte="+decbyte);
alert("decmsg="+decmsg);
}*/

java代码：
package com.daorigin.util;

import java.util.ArrayList;
import java.util.List;

public class DES {
public DES() {
}
public static void main(String[] args) {
DES desObj = new DES();
String key1 = "1";
String key2 = "2";
String key3 = "3";
String data = "admin";
String str = desObj.strEnc(data, key1, key2, key3);
System.out.println(str);
String dec = desObj.strDec(str, key1, key2, key3);
System.out.println(dec);
}

/**
* DES加密/解密
*
* @Copyright Copyright (c) 2006
* @author Guapo
* @see DESCore
*/

/*
* encrypt the string to string made up of hex return the encrypted string
*/
public String strEnc(String data, String firstKey, String secondKey,
String thirdKey) {

int leng = data.length();
String encData = "";
List firstKeyBt = null, secondKeyBt = null, thirdKeyBt = null;
int firstLength = 0, secondLength = 0, thirdLength = 0;
if (firstKey != null && firstKey != "") {
firstKeyBt = getKeyBytes(firstKey);
firstLength = firstKeyBt.size();
}
if (secondKey != null && secondKey != "") {
secondKeyBt = getKeyBytes(secondKey);
secondLength = secondKeyBt.size();
}
if (thirdKey != null && thirdKey != "") {
thirdKeyBt = getKeyBytes(thirdKey);
thirdLength = thirdKeyBt.size();
}

if (leng > 0) {
if (leng < 4) {
int[] bt = strToBt(data);
int[] encByte = null;
if (firstKey != null && firstKey != "" && secondKey != null
&& secondKey != "" && thirdKey != null
&& thirdKey != "") {
int[] tempBt;
int x, y, z;
tempBt = bt;
for (x = 0; x < firstLength; x++) {
tempBt = enc(tempBt, (int[]) firstKeyBt.get(x));
}
for (y = 0; y < secondLength; y++) {
tempBt = enc(tempBt, (int[]) secondKeyBt.get(y));
}
for (z = 0; z < thirdLength; z++) {
tempBt = enc(tempBt, (int[]) thirdKeyBt.get(z));
}
encByte = tempBt;
} else {
if (firstKey != null && firstKey != "" && secondKey != null
&& secondKey != "") {
int[] tempBt;
int x, y;
tempBt = bt;
for (x = 0; x < firstLength; x++) {
tempBt = enc(tempBt, (int[]) firstKeyBt.get(x));
}
for (y = 0; y < secondLength; y++) {
tempBt = enc(tempBt, (int[]) secondKeyBt.get(y));
}
encByte = tempBt;
} else {
if (firstKey != null && firstKey != "") {
int[] tempBt;
int x = 0;
tempBt = bt;
for (x = 0; x < firstLength; x++) {
tempBt = enc(tempBt, (int[]) firstKeyBt.get(x));
}
encByte = tempBt;
}
}
}
encData = bt64ToHex(encByte);
} else {
int iterator = (leng / 4);
int remainder = leng % 4;
int i = 0;
for (i = 0; i < iterator; i++) {
String tempData = data.substring(i * 4 + 0, i * 4 + 4);
int[] tempByte = strToBt(tempData);
int[] encByte = null;
if (firstKey != null && firstKey != "" && secondKey != null
&& secondKey != "" && thirdKey != null
&& thirdKey != "") {
int[] tempBt;
int x, y, z;
tempBt = tempByte;
for (x = 0; x < firstLength; x++) {
tempBt = enc(tempBt, (int[]) firstKeyBt.get(x));
}
for (y = 0; y < secondLength; y++) {
tempBt = enc(tempBt, (int[]) secondKeyBt.get(y));
}
for (z = 0; z < thirdLength; z++) {
tempBt = enc(tempBt, (int[]) thirdKeyBt.get(z));
}
encByte = tempBt;
} else {
if (firstKey != null && firstKey != ""
&& secondKey != null && secondKey != "") {
int[] tempBt;
int x, y;
tempBt = tempByte;
for (x = 0; x < firstLength; x++) {
tempBt = enc(tempBt, (int[]) firstKeyBt.get(x));
}
for (y = 0; y < secondLength; y++) {
tempBt = enc(tempBt, (int[]) secondKeyBt.get(y));
}
encByte = tempBt;
} else {
if (firstKey != null && firstKey != "") {
int[] tempBt;
int x;
tempBt = tempByte;
for (x = 0; x < firstLength; x++) {
tempBt = enc(tempBt, (int[]) firstKeyBt
.get(x));
}
encByte = tempBt;
}
}
}
encData += bt64ToHex(encByte);
}
if (remainder > 0) {
String remainderData = data.substring(iterator * 4 + 0,
leng);
int[] tempByte = strToBt(remainderData);
int[] encByte = null;
if (firstKey != null && firstKey != "" && secondKey != null
&& secondKey != "" && thirdKey != null
&& thirdKey != "") {
int[] tempBt;
int x, y, z;
tempBt = tempByte;
for (x = 0; x < firstLength; x++) {
tempBt = enc(tempBt, (int[]) firstKeyBt.get(x));
}
for (y = 0; y < secondLength; y++) {
tempBt = enc(tempBt, (int[]) secondKeyBt.get(y));
}
for (z = 0; z < thirdLength; z++) {
tempBt = enc(tempBt, (int[]) thirdKeyBt.get(z));
}
encByte = tempBt;
} else {
if (firstKey != null && firstKey != ""
&& secondKey != null && secondKey != "") {
int[] tempBt;
int x, y;
tempBt = tempByte;
for (x = 0; x < firstLength; x++) {
tempBt = enc(tempBt, (int[]) firstKeyBt.get(x));
}
for (y = 0; y < secondLength; y++) {
tempBt = enc(tempBt, (int[]) secondKeyBt.get(y));
}
encByte = tempBt;
} else {
if (firstKey != null && firstKey != "") {
int[] tempBt;
int x;
tempBt = tempByte;
for (x = 0; x < firstLength; x++) {
tempBt = enc(tempBt, (int[]) firstKeyBt
.get(x));
}
encByte = tempBt;
}
}
}
encData += bt64ToHex(encByte);
}
}
}
return encData;
}

/*
* decrypt the encrypted string to the original string
*
* return the original string
*/
public String strDec(String data, String firstKey, String secondKey,
String thirdKey) {
int leng = data.length();
String decStr = "";
List firstKeyBt = null, secondKeyBt = null, thirdKeyBt = null;
int firstLength = 0, secondLength = 0, thirdLength = 0;
if (firstKey != null && firstKey != "") {
firstKeyBt = getKeyBytes(firstKey);
firstLength = firstKeyBt.size();
}
if (secondKey != null && secondKey != "") {
secondKeyBt = getKeyBytes(secondKey);
secondLength = secondKeyBt.size();
}
if (thirdKey != null && thirdKey != "") {
thirdKeyBt = getKeyBytes(thirdKey);
thirdLength = thirdKeyBt.size();
}

int iterator = leng / 16;
int i = 0;
for (i = 0; i < iterator; i++) {
String tempData = data.substring(i * 16 + 0, i * 16 + 16);
String strByte = hexToBt64(tempData);
int[] intByte = new int[64];
int j = 0;
for (j = 0; j < 64; j++) {
intByte[j] = Integer.parseInt(strByte.substring(j, j + 1));
}
int[] decByte = null;
if (firstKey != null && firstKey != "" && secondKey != null
&& secondKey != "" && thirdKey != null && thirdKey != "") {
int[] tempBt;
int x, y, z;
tempBt = intByte;
for (x = thirdLength - 1; x >= 0; x--) {
tempBt = dec(tempBt, (int[]) thirdKeyBt.get(x));
}
for (y = secondLength - 1; y >= 0; y--) {
tempBt = dec(tempBt, (int[]) secondKeyBt.get(y));
}
for (z = firstLength - 1; z >= 0; z--) {
tempBt = dec(tempBt, (int[]) firstKeyBt.get(z));
}
decByte = tempBt;
} else {
if (firstKey != null && firstKey != "" && secondKey != null
&& secondKey != "") {
int[] tempBt;
int x, y, z;
tempBt = intByte;
for (x = secondLength - 1; x >= 0; x--) {
tempBt = dec(tempBt, (int[]) secondKeyBt.get(x));
}
for (y = firstLength - 1; y >= 0; y--) {
tempBt = dec(tempBt, (int[]) firstKeyBt.get(y));
}
decByte = tempBt;
} else {
if (firstKey != null && firstKey != "") {
int[] tempBt;
int x, y, z;
tempBt = intByte;
for (x = firstLength - 1; x >= 0; x--) {
tempBt = dec(tempBt, (int[]) firstKeyBt.get(x));
}
decByte = tempBt;
}
}
}
decStr += byteToString(decByte);
}
return decStr;
}

/*
* chang the string into the bit array
*
* return bit array(it's length % 64 = 0)
*/
public List getKeyBytes(String key) {
List keyBytes = new ArrayList();
int leng = key.length();
int iterator = (leng / 4);
int remainder = leng % 4;
int i = 0;
for (i = 0; i < iterator; i++) {
keyBytes.add(i, strToBt(key.substring(i * 4 + 0, i * 4 + 4)));
}
if (remainder > 0) {
// keyBytes[i] = strToBt(key.substring(i*4+0,leng));
keyBytes.add(i, strToBt(key.substring(i * 4 + 0, leng)));
}
return keyBytes;
}

/*
* chang the string(it's length <= 4) into the bit array
*
* return bit array(it's length = 64)
*/
public int[] strToBt(String str) {
int leng = str.length();
int[] bt = new int[64];
if (leng < 4) {
int i = 0, j = 0, p = 0, q = 0;
for (i = 0; i < leng; i++) {
int k = str.charAt(i);
for (j = 0; j < 16; j++) {
int pow = 1, m = 0;
for (m = 15; m > j; m--) {
pow *= 2;
}
// bt.set(16*i+j,""+(k/pow)%2));
bt[16 * i + j] = (k / pow) % 2;
}
}
for (p = leng; p < 4; p++) {
int k = 0;
for (q = 0; q < 16; q++) {
int pow = 1, m = 0;
for (m = 15; m > q; m--) {
pow *= 2;
}
// bt[16*p+q]=parseInt(k/pow)%2;
// bt.add(16*p+q,""+((k/pow)%2));
bt[16 * p + q] = (k / pow) % 2;
}
}
} else {
for (int i = 0; i < 4; i++) {
int k = str.charAt(i);
for (int j = 0; j < 16; j++) {
int pow = 1;
for (int m = 15; m > j; m--) {
pow *= 2;
}
// bt[16*i+j]=parseInt(k/pow)%2;
// bt.add(16*i+j,""+((k/pow)%2));
bt[16 * i + j] = (k / pow) % 2;
}
}
}
return bt;
}

/*
* chang the bit(it's length = 4) into the hex
*
* return hex
*/
public String bt4ToHex(String binary) {
String hex = "";
if (binary.equalsIgnoreCase("0000")) {
hex = "0";
} else if (binary.equalsIgnoreCase("0001")) {
hex = "1";
} else if (binary.equalsIgnoreCase("0010")) {
hex = "2";
} else if (binary.equalsIgnoreCase("0011")) {
hex = "3";
} else if (binary.equalsIgnoreCase("0100")) {
hex = "4";
} else if (binary.equalsIgnoreCase("0101")) {
hex = "5";
} else if (binary.equalsIgnoreCase("0110")) {
hex = "6";
} else if (binary.equalsIgnoreCase("0111")) {
hex = "7";
} else if (binary.equalsIgnoreCase("1000")) {
hex = "8";
} else if (binary.equalsIgnoreCase("1001")) {
hex = "9";
} else if (binary.equalsIgnoreCase("1010")) {
hex = "A";
} else if (binary.equalsIgnoreCase("1011")) {
hex = "B";
} else if (binary.equalsIgnoreCase("1100")) {
hex = "C";
} else if (binary.equalsIgnoreCase("1101")) {
hex = "D";
} else if (binary.equalsIgnoreCase("1110")) {
hex = "E";
} else if (binary.equalsIgnoreCase("1111")) {
hex = "F";
}

return hex;
}

/*
* chang the hex into the bit(it's length = 4)
*
* return the bit(it's length = 4)
*/
public String hexToBt4(String hex) {
String binary = "";
if (hex.equalsIgnoreCase("0")) {
binary = "0000";
} else if (hex.equalsIgnoreCase("1")) {
binary = "0001";
}
if (hex.equalsIgnoreCase("2")) {
binary = "0010";
}
if (hex.equalsIgnoreCase("3")) {
binary = "0011";
}
if (hex.equalsIgnoreCase("4")) {
binary = "0100";
}
if (hex.equalsIgnoreCase("5")) {
binary = "0101";
}
if (hex.equalsIgnoreCase("6")) {
binary = "0110";
}
if (hex.equalsIgnoreCase("7")) {
binary = "0111";
}
if (hex.equalsIgnoreCase("8")) {
binary = "1000";
}
if (hex.equalsIgnoreCase("9")) {
binary = "1001";
}
if (hex.equalsIgnoreCase("A")) {
binary = "1010";
}
if (hex.equalsIgnoreCase("B")) {
binary = "1011";
}
if (hex.equalsIgnoreCase("C")) {
binary = "1100";
}
if (hex.equalsIgnoreCase("D")) {
binary = "1101";
}
if (hex.equalsIgnoreCase("E")) {
binary = "1110";
}
if (hex.equalsIgnoreCase("F")) {
binary = "1111";
}
return binary;
}

/*
* chang the bit(it's length = 64) into the string
*
* return string
*/
public String byteToString(int[] byteData) {
String str = "";
for (int i = 0; i < 4; i++) {
int count = 0;
for (int j = 0; j < 16; j++) {
int pow = 1;
for (int m = 15; m > j; m--) {
pow *= 2;
}
count += byteData[16 * i + j] * pow;
}
if (count != 0) {
str += "" + (char) (count);
}
}
return str;
}

public String bt64ToHex(int[] byteData) {
String hex = "";
for (int i = 0; i < 16; i++) {
String bt = "";
for (int j = 0; j < 4; j++) {
bt += byteData[i * 4 + j];
}
hex += bt4ToHex(bt);
}
return hex;
}

public String hexToBt64(String hex) {
String binary = "";
for (int i = 0; i < 16; i++) {
binary += hexToBt4(hex.substring(i, i + 1));
}
return binary;
}

/*
* the 64 bit des core arithmetic
*/

public int[] enc(int[] dataByte, int[] keyByte) {
int[][] keys = generateKeys(keyByte);
int[] ipByte = initPermute(dataByte);
int[] ipLeft = new int[32];
int[] ipRight = new int[32];
int[] tempLeft = new int[32];
int i = 0, j = 0, k = 0, m = 0, n = 0;
for (k = 0; k < 32; k++) {
ipLeft[k] = ipByte[k];
ipRight[k] = ipByte[32 + k];
}
for (i = 0; i < 16; i++) {
for (j = 0; j < 32; j++) {
tempLeft[j] = ipLeft[j];
ipLeft[j] = ipRight[j];
}
int[] key = new int[48];
for (m = 0; m < 48; m++) {
key[m] = keys[i][m];
}
int[] tempRight = xor(pPermute(sBoxPermute(xor(
expandPermute(ipRight), key))), tempLeft);
for (n = 0; n < 32; n++) {
ipRight
= tempRight
;
}

}

int[] finalData = new int[64];
for (i = 0; i < 32; i++) {
finalData[i] = ipRight[i];
finalData[32 + i] = ipLeft[i];
}
return finallyPermute(finalData);
}

public int[] dec(int[] dataByte, int[] keyByte) {
int[][] keys = generateKeys(keyByte);
int[] ipByte = initPermute(dataByte);
int[] ipLeft = new int[32];
int[] ipRight = new int[32];
int[] tempLeft = new int[32];
int i = 0, j = 0, k = 0, m = 0, n = 0;
for (k = 0; k < 32; k++) {
ipLeft[k] = ipByte[k];
ipRight[k] = ipByte[32 + k];
}
for (i = 15; i >= 0; i--) {
for (j = 0; j < 32; j++) {
tempLeft[j] = ipLeft[j];
ipLeft[j] = ipRight[j];
}
int[] key = new int[48];
for (m = 0; m < 48; m++) {
key[m] = keys[i][m];
}

int[] tempRight = xor(pPermute(sBoxPermute(xor(
expandPermute(ipRight), key))), tempLeft);
for (n = 0; n < 32; n++) {
ipRight
= tempRight
;
}
}

int[] finalData = new int[64];
for (i = 0; i < 32; i++) {
finalData[i] = ipRight[i];
finalData[32 + i] = ipLeft[i];
}
return finallyPermute(finalData);
}

public int[] initPermute(int[] originalData) {
int[] ipByte = new int[64];
int i = 0, m = 1, n = 0, j, k;
for (i = 0, m = 1, n = 0; i < 4; i++, m += 2, n += 2) {
for (j = 7, k = 0; j >= 0; j--, k++) {
ipByte[i * 8 + k] = originalData[j * 8 + m];
ipByte[i * 8 + k + 32] = originalData[j * 8 + n];
}
}
return ipByte;
}

public int[] expandPermute(int[] rightData) {
int[] epByte = new int[48];
int i, j;
for (i = 0; i < 8; i++) {
if (i == 0) {
epByte[i * 6 + 0] = rightData[31];
} else {
epByte[i * 6 + 0] = rightData[i * 4 - 1];
}
epByte[i * 6 + 1] = rightData[i * 4 + 0];
epByte[i * 6 + 2] = rightData[i * 4 + 1];
epByte[i * 6 + 3] = rightData[i * 4 + 2];
epByte[i * 6 + 4] = rightData[i * 4 + 3];
if (i == 7) {
epByte[i * 6 + 5] = rightData[0];
} else {
epByte[i * 6 + 5] = rightData[i * 4 + 4];
}
}
return epByte;
}

public int[] xor(int[] byteOne, int[] byteTwo) {
// var xorByte = new Array(byteOne.length);
// for(int i = 0;i < byteOne.length; i ++){
// xorByte[i] = byteOne[i] ^ byteTwo[i];
// }
// return xorByte;
int[] xorByte = new int[byteOne.length];
for (int i = 0; i < byteOne.length; i++) {
xorByte[i] = byteOne[i] ^ byteTwo[i];
}
return xorByte;
}

public int[] sBoxPermute(int[] expandByte) {

// var sBoxByte = new Array(32);
int[] sBoxByte = new int[32];
String binary = "";
int[][] s1 = {
{ 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7 },
{ 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8 },
{ 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0 },
{ 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13 } };

/* Table - s2 */
int[][] s2 = {
{ 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10 },
{ 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5 },
{ 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15 },
{ 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9 } };

/* Table - s3 */
int[][] s3 = {
{ 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8 },
{ 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1 },
{ 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7 },
{ 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12 } };
/* Table - s4 */
int[][] s4 = {
{ 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15 },
{ 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9 },
{ 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4 },
{ 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14 } };

/* Table - s5 */
int[][] s5 = {
{ 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9 },
{ 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6 },
{ 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14 },
{ 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3 } };

/* Table - s6 */
int[][] s6 = {
{ 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11 },
{ 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8 },
{ 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6 },
{ 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13 } };

/* Table - s7 */
int[][] s7 = {
{ 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1 },
{ 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6 },
{ 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2 },
{ 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12 } };

/* Table - s8 */
int[][] s8 = {
{ 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7 },
{ 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2 },
{ 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8 },
{ 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 } };

for (int m = 0; m < 8; m++) {
int i = 0, j = 0;
i = expandByte[m * 6 + 0] * 2 + expandByte[m * 6 + 5];
j = expandByte[m * 6 + 1] * 2 * 2 * 2 + expandByte[m * 6 + 2] * 2
* 2 + expandByte[m * 6 + 3] * 2 + expandByte[m * 6 + 4];
switch (m) {
case 0:
binary = getBoxBinary(s1[i][j]);
break;
case 1:
binary = getBoxBinary(s2[i][j]);
break;
case 2:
binary = getBoxBinary(s3[i][j]);
break;
case 3:
binary = getBoxBinary(s4[i][j]);
break;
case 4:
binary = getBoxBinary(s5[i][j]);
break;
case 5:
binary = getBoxBinary(s6[i][j]);
break;
case 6:
binary = getBoxBinary(s7[i][j]);
break;
case 7:
binary = getBoxBinary(s8[i][j]);
break;
}
sBoxByte[m * 4 + 0] = Integer.parseInt(binary.substring(0, 1));
sBoxByte[m * 4 + 1] = Integer.parseInt(binary.substring(1, 2));
sBoxByte[m * 4 + 2] = Integer.parseInt(binary.substring(2, 3));
sBoxByte[m * 4 + 3] = Integer.parseInt(binary.substring(3, 4));
}
return sBoxByte;
}

public int[] pPermute(int[] sBoxByte) {
int[] pBoxPermute = new int[32];
pBoxPermute[0] = sBoxByte[15];
pBoxPermute[1] = sBoxByte[6];
pBoxPermute[2] = sBoxByte[19];
pBoxPermute[3] = sBoxByte[20];
pBoxPermute[4] = sBoxByte[28];
pBoxPermute[5] = sBoxByte[11];
pBoxPermute[6] = sBoxByte[27];
pBoxPermute[7] = sBoxByte[16];
pBoxPermute[8] = sBoxByte[0];
pBoxPermute[9] = sBoxByte[14];
pBoxPermute[10] = sBoxByte[22];
pBoxPermute[11] = sBoxByte[25];
pBoxPermute[12] = sBoxByte[4];
pBoxPermute[13] = sBoxByte[17];
pBoxPermute[14] = sBoxByte[30];
pBoxPermute[15] = sBoxByte[9];
pBoxPermute[16] = sBoxByte[1];
pBoxPermute[17] = sBoxByte[7];
pBoxPermute[18] = sBoxByte[23];
pBoxPermute[19] = sBoxByte[13];
pBoxPermute[20] = sBoxByte[31];
pBoxPermute[21] = sBoxByte[26];
pBoxPermute[22] = sBoxByte[2];
pBoxPermute[23] = sBoxByte[8];
pBoxPermute[24] = sBoxByte[18];
pBoxPermute[25] = sBoxByte[12];
pBoxPermute[26] = sBoxByte[29];
pBoxPermute[27] = sBoxByte[5];
pBoxPermute[28] = sBoxByte[21];
pBoxPermute[29] = sBoxByte[10];
pBoxPermute[30] = sBoxByte[3];
pBoxPermute[31] = sBoxByte[24];
return pBoxPermute;
}

public int[] finallyPermute(int[] endByte) {
int[] fpByte = new int[64];
fpByte[0] = endByte[39];
fpByte[1] = endByte[7];
fpByte[2] = endByte[47];
fpByte[3] = endByte[15];
fpByte[4] = endByte[55];
fpByte[5] = endByte[23];
fpByte[6] = endByte[63];
fpByte[7] = endByte[31];
fpByte[8] = endByte[38];
fpByte[9] = endByte[6];
fpByte[10] = endByte[46];
fpByte[11] = endByte[14];
fpByte[12] = endByte[54];
fpByte[13] = endByte[22];
fpByte[14] = endByte[62];
fpByte[15] = endByte[30];
fpByte[16] = endByte[37];
fpByte[17] = endByte[5];
fpByte[18] = endByte[45];
fpByte[19] = endByte[13];
fpByte[20] = endByte[53];
fpByte[21] = endByte[21];
fpByte[22] = endByte[61];
fpByte[23] = endByte[29];
fpByte[24] = endByte[36];
fpByte[25] = endByte[4];
fpByte[26] = endByte[44];
fpByte[27] = endByte[12];
fpByte[28] = endByte[52];
fpByte[29] = endByte[20];
fpByte[30] = endByte[60];
fpByte[31] = endByte[28];
fpByte[32] = endByte[35];
fpByte[33] = endByte[3];
fpByte[34] = endByte[43];
fpByte[35] = endByte[11];
fpByte[36] = endByte[51];
fpByte[37] = endByte[19];
fpByte[38] = endByte[59];
fpByte[39] = endByte[27];
fpByte[40] = endByte[34];
fpByte[41] = endByte[2];
fpByte[42] = endByte[42];
fpByte[43] = endByte[10];
fpByte[44] = endByte[50];
fpByte[45] = endByte[18];
fpByte[46] = endByte[58];
fpByte[47] = endByte[26];
fpByte[48] = endByte[33];
fpByte[49] = endByte[1];
fpByte[50] = endByte[41];
fpByte[51] = endByte[9];
fpByte[52] = endByte[49];
fpByte[53] = endByte[17];
fpByte[54] = endByte[57];
fpByte[55] = endByte[25];
fpByte[56] = endByte[32];
fpByte[57] = endByte[0];
fpByte[58] = endByte[40];
fpByte[59] = endByte[8];
fpByte[60] = endByte[48];
fpByte[61] = endByte[16];
fpByte[62] = endByte[56];
fpByte[63] = endByte[24];
return fpByte;
}

public String getBoxBinary(int i) {
String binary = "";
switch (i) {
case 0:
binary = "0000";
break;
case 1:
binary = "0001";
break;
case 2:
binary = "0010";
break;
case 3:
binary = "0011";
break;
case 4:
binary = "0100";
break;
case 5:
binary = "0101";
break;
case 6:
binary = "0110";
break;
case 7:
binary = "0111";
break;
case 8:
binary = "1000";
break;
case 9:
binary = "1001";
break;
case 10:
binary = "1010";
break;
case 11:
binary = "1011";
break;
case 12:
binary = "1100";
break;
case 13:
binary = "1101";
break;
case 14:
binary = "1110";
break;
case 15:
binary = "1111";
break;
}
return binary;
}

/*
* generate 16 keys for xor
*
*/
public int[][] generateKeys(int[] keyByte) {
int[] key = new int[56];
int[][] keys = new int[16][48];

// keys[ 0] = new Array();
// keys[ 1] = new Array();
// keys[ 2] = new Array();
// keys[ 3] = new Array();
// keys[ 4] = new Array();
// keys[ 5] = new Array();
// keys[ 6] = new Array();
// keys[ 7] = new Array();
// keys[ 8] = new Array();
// keys[ 9] = new Array();
// keys[10] = new Array();
// keys[11] = new Array();
// keys[12] = new Array();
// keys[13] = new Array();
// keys[14] = new Array();
// keys[15] = new Array();
int[] loop = new int[] { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 };

for (int i = 0; i < 7; i++) {
for (int j = 0, k = 7; j < 8; j++, k--) {
key[i * 8 + j] = keyByte[8 * k + i];
}
}

int i = 0;
for (i = 0; i < 16; i++) {
int tempLeft = 0;
int tempRight = 0;
for (int j = 0; j < loop[i]; j++) {
tempLeft = key[0];
tempRight = key[28];
for (int k = 0; k < 27; k++) {
key[k] = key[k + 1];
key[28 + k] = key[29 + k];
}
key[27] = tempLeft;
key[55] = tempRight;
}
// var tempKey = new Array(48);
int[] tempKey = new int[48];
tempKey[0] = key[13];
tempKey[1] = key[16];
tempKey[2] = key[10];
tempKey[3] = key[23];
tempKey[4] = key[0];
tempKey[5] = key[4];
tempKey[6] = key[2];
tempKey[7] = key[27];
tempKey[8] = key[14];
tempKey[9] = key[5];
tempKey[10] = key[20];
tempKey[11] = key[9];
tempKey[12] = key[22];
tempKey[13] = key[18];
tempKey[14] = key[11];
tempKey[15] = key[3];
tempKey[16] = key[25];
tempKey[17] = key[7];
tempKey[18] = key[15];
tempKey[19] = key[6];
tempKey[20] = key[26];
tempKey[21] = key[19];
tempKey[22] = key[12];
tempKey[23] = key[1];
tempKey[24] = key[40];
tempKey[25] = key[51];
tempKey[26] = key[30];
tempKey[27] = key[36];
tempKey[28] = key[46];
tempKey[29] = key[54];
tempKey[30] = key[29];
tempKey[31] = key[39];
tempKey[32] = key[50];
tempKey[33] = key[44];
tempKey[34] = key[32];
tempKey[35] = key[47];
tempKey[36] = key[43];
tempKey[37] = key[48];
tempKey[38] = key[38];
tempKey[39] = key[55];
tempKey[40] = key[33];
tempKey[41] = key[52];
tempKey[42] = key[45];
tempKey[43] = key[41];
tempKey[44] = key[49];
tempKey[45] = key[35];
tempKey[46] = key[28];
tempKey[47] = key[31];
int m;
switch (i) {
case 0:
for (m = 0; m < 48; m++) {
keys[0][m] = tempKey[m];
}
break;
case 1:
for (m = 0; m < 48; m++) {
keys[1][m] = tempKey[m];
}
break;
case 2:
for (m = 0; m < 48; m++) {
keys[2][m] = tempKey[m];
}
break;
case 3:
for (m = 0; m < 48; m++) {
keys[3][m] = tempKey[m];
}
break;
case 4:
for (m = 0; m < 48; m++) {
keys[4][m] = tempKey[m];
}
break;
case 5:
for (m = 0; m < 48; m++) {
keys[5][m] = tempKey[m];
}
break;
case 6:
for (m = 0; m < 48; m++) {
keys[6][m] = tempKey[m];
}
break;
case 7:
for (m = 0; m < 48; m++) {
keys[7][m] = tempKey[m];
}
break;
case 8:
for (m = 0; m < 48; m++) {
keys[8][m] = tempKey[m];
}
break;
case 9:
for (m = 0; m < 48; m++) {
keys[9][m] = tempKey[m];
}
break;
case 10:
for (m = 0; m < 48; m++) {
keys[10][m] = tempKey[m];
}
break;
case 11:
for (m = 0; m < 48; m++) {
keys[11][m] = tempKey[m];
}
break;
case 12:
for (m = 0; m < 48; m++) {
keys[12][m] = tempKey[m];
}
break;
case 13:
for (m = 0; m < 48; m++) {
keys[13][m] = tempKey[m];
}
break;
case 14:
for (m = 0; m < 48; m++) {
keys[14][m] = tempKey[m];
}
break;
case 15:
for (m = 0; m < 48; m++) {
keys[15][m] = tempKey[m];
}
break;
}
}
return keys;
}
}

调用代码：
strEnc(str,'key1','key2','key3');//加密 key1必须 key2,key3非必须
<pre name="code" class="javascript">strDec(str,'key1','key2','key3');//解密 key1必须 key2,key3非必须

DES des = new DES();
des.strDec(str, "key1", "key2", "key3");//加密 key1必须 key2,key3非必须
des.strEnc(str, "key1", "key2", "key3");//解密 key1必须 key2,key3非必须