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("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）：

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:

在线md5/hash/sha-1/sha-2/sha-256/sha-512/sha-3/ripemd-160加密工具：

在线sha1/sha224/sha256/sha384/sha512加密工具：

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。