Java实现与JS相同的Des加解密算法完整实例

本文实例讲述了Java实现与JS相同的Des加解密算法。分享给大家供大家参考，具体如下：

这里演示java与js实现相同的des加解密算法，不多说，不废话，直接上代码

一、java实现

package com.lyz.base.des;
import java.util.ArrayList;
import java.util.List;
/**
 * DES加密/解密
 *
 * @Copyright Copyright (c) 2015
 * @author liuyazhuang
 * @see DESCore
 */
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 = "jb51.net";
    String str = desObj.strEnc(data, key1, key2, key3);
    System.out.println("小牛知识库测试结果：");
    System.out.println(str);
    String dec = desObj.strDec(str, key1, key2, key3);
    System.out.println(dec);
  }
  /**
   * DES加密/解密
   *
   * @Copyright Copyright (c) 2015
   * @author liuyazhuang
   * @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[n] = tempRight[n];
      }
    }
    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[n] = tempRight[n];
      }
    }
    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;
  }
}

运行结果：

二、JS实现

1、des.js文件

/**
* DES加密/解密
* @Copyright Copyright (c) 2015
* @author liuyazhuang
* @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 && 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[n] = tempRight[n];
  }
 }
 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[n] = tempRight[n];
  }
 }
 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;
}

2、des.html文件

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  <script type="text/javascript" src="des.js"></script>
  <script>
    function getResult(){
      //待加密字符串
      var str = document.getElementById("str").innerHTML;
      //第一个参数必须；第二个、第三个参数可选
      var key1 = document.getElementById("key1").innerHTML;
      var key2 = document.getElementById("key2").innerHTML;
      var key3 = document.getElementById("key3").innerHTML;
      //加密方法
      var enResult = strEnc(str,key1,key2,key3);
      //解密方法
      var deResult = strDec(enResult,key1,key2,key3);
      //展示结果
      document.getElementById("enStr").innerHTML = enResult;
      document.getElementById("dnStr").innerHTML = deResult;
    }
  </script>
</head>
<body>
<input type="button" value="获取加密结果与解密结果" onclick="getResult()" />
  <table>
    <tr>
     <td align="left">字符串：</td>
     <td><span id="str">jb51.net</span></td>
    </tr>
    <tr>
     <td>加密key：</td>
     <td>key1=<span id="key1">1</span>;key2=<span id="key2">2</span>;key3=<span id="key3">3</span></td>
    </tr>
    <tr>
     <td align="left">加密结果：</td>
     <td align="left"><label id = "enStr"></label></td>
    </tr>
    <tr>
     <td align="left">解密结果： </td>
     <td align="left"><label id = "dnStr"></label></td>
    </tr>
  <table>
</body>
</html>

运行结果：

PS：关于加密解密感兴趣的朋友还可以参考本站在线工具：

文字在线加密解密工具（包含AES、DES、RC4等）：
http://tools.jb51.net/password/txt_encode

MD5在线加密工具:
http://tools.jb51.net/password/CreateMD5Password

在线散列/哈希算法加密工具:
http://tools.jb51.net/password/hash_encrypt

在线MD5/hash/SHA-1/SHA-2/SHA-256/SHA-512/SHA-3/RIPEMD-160加密工具：
http://tools.jb51.net/password/hash_md5_sha

在线sha1/sha224/sha256/sha384/sha512加密工具：
http://tools.jb51.net/password/sha_encode

更多关于java相关内容感兴趣的读者可查看本站专题：《Java数学运算技巧总结》、《Java数据结构与算法教程》、《Java字符与字符串操作技巧总结》、《Java操作DOM节点技巧总结》和《Java缓存操作技巧汇总》

希望本文所述对大家java程序设计有所帮助。