Des源碼

packagecom.agiers.util;

publicclassDes {

  byte[] bytekey;

  publicDes(String strKey) {
    intlen = strKey.length();
    if(len< 8) {
      for(inti = len; i< 8; i++) {
        strKey += " ";
      }
    }
    this.bytekey = strKey.getBytes();
  }

  // 聲明常量字節數組
  privatestaticfinalint[] IP = { 58, 50, 42, 34, 26, 18, 10, 2,
      60, 52, 44, 36, 28, 20, 12, 4, 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48,
      40, 32, 24, 16, 8, 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19,
      11, 3, 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7}; // 64
  privatestaticfinalint[] IP_1 = { 40, 8, 48, 16, 56, 24, 64, 32,
      39, 7, 47, 15, 55, 23, 63, 31, 38, 6, 46, 14, 54, 22, 62, 30, 37, 5, 45,
      13, 53, 21, 61, 29, 36, 4, 44, 12, 52, 20, 60, 28, 35, 3, 43, 11, 51, 19,
      59, 27, 34, 2, 42, 10, 50, 18, 58, 26, 33, 1, 41, 9, 49, 17, 57, 25}; // 64
  privatestaticfinalint[] PC_1 = { 57, 49, 41, 33, 25, 17, 9, 1, 58,
      50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36,
      63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45,
      37, 29, 21, 13, 5, 28, 20, 12, 4}; // 56
  privatestaticfinalint[] PC_2 = { 14, 17, 11, 24, 1, 5, 3, 28, 15,
      6, 21, 10, 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2, 41, 52, 31, 37,
      47, 55, 30, 40, 51, 45, 33, 48, 44, 49, 39, 56, 34, 53, 46, 42, 50, 36,
      29, 32}; // 48
  privatestaticfinalint[] E = { 32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8,
      9, 8, 9, 10, 11, 12, 13, 12, 13, 14, 15, 16, 17, 16, 17, 18, 19, 20, 21,
      20, 21, 22, 23, 24, 25, 24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32, 1}; // 48
  privatestaticfinalint[] P = { 16, 7, 20, 21, 29, 12, 28, 17, 1,
      15, 23, 26, 5, 18, 31, 10, 2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22,
      11, 4, 25}; // 32
  privatestaticfinalint[][][] S_Box = {
      { { 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} }, { // S_Box[1]
      { 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} }, { // S_Box[2]
      { 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} }, { // S_Box[3]
      { 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} }, { // S_Box[4]
      { 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} }, { // S_Box[5]
      { 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} }, { // S_Box[6]
      { 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} }, { // S_Box[7]
      { 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} } // S_Box[8]
  };
  privatestaticfinalint[] LeftMove = { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2,
      2, 2, 2, 2, 1}; // 左移位置列表

  privatebyte[] UnitDes(byte[] des_key, byte[] des_data, intflag) {
    // 檢測輸入參數格式是否正確，錯誤直接返回空值（null）
    if((des_key.length != 8) || (des_data.length != 8)
        || ((flag != 1)&& (flag != 0))) {
      thrownewRuntimeException("Data Format Error !");
    }

    intflags = flag;

    // 二進制加密密鑰
    int[] keydata = newint[64];

    // 二進制加密數據
    int[] encryptdata = newint[64];

    // 加密操作完成後的字節數組
    byte[] EncryptCode = newbyte[8];

    // 密鑰初試化成二維數組
    int[][] KeyArray = newint[16][48];
    // 將密鑰字節數組轉換成二進制字節數組
    keydata = ReadDataToBirnaryIntArray(des_key);
    // 將加密數據字節數組轉換成二進制字節數組
    encryptdata = ReadDataToBirnaryIntArray(des_data);
    // 初試化密鑰爲二維密鑰數組
    KeyInitialize(keydata, KeyArray);
    // 執行加密解密操作
    EncryptCode = Encrypt(encryptdata, flags, KeyArray);

    returnEncryptCode;
  }

  // 初試化密鑰數組
  privatevoidKeyInitialize(int[] key, int[][] keyarray) {
    inti;
    intj;
    int[] K0 = newint[56];

    // 特別注意：xxx[IP[i]-1]等類似變換
    for(i = 0; i< 56; i++) {
      K0[i] = key[PC_1[i] - 1]; // 密鑰進行PC-1變換
    }

    for(i = 0; i< 16; i++) {
      LeftBitMove(K0, LeftMove[i]);

      // 特別注意：xxx[IP[i]-1]等類似變換
      for(j = 0; j< 48; j++) {
        keyarray[i][j] = K0[PC_2[j] - 1]; // 生成子密鑰keyarray[i][j]
      }
    }
  }

  // 執行加密解密操作
  privatebyte[] Encrypt(int[] timeData, intflag, int[][] keyarray) {
    inti;
    byte[] encrypt = newbyte[8];
    intflags = flag;
    int[] M = newint[64];
    int[] MIP_1 = newint[64];

    // 特別注意：xxx[IP[i]-1]等類似變換
    for(i = 0; i< 64; i++) {
      M[i] = timeData[IP[i] - 1]; // 明文IP變換
    }

    if(flags == 1) { // 加密

      for(i = 0; i< 16; i++) {
        LoopF(M, i, flags, keyarray);
      }
    }
    elseif(flags == 0) { // 解密

      for(i = 15; i > -1; i--) {
        LoopF(M, i, flags, keyarray);
      }
    }

    for(i = 0; i< 64; i++) {
      MIP_1[i] = M[IP_1[i] - 1]; // 進行IP-1運算
    }

    GetEncryptResultOfByteArray(MIP_1, encrypt);

    // 返回加密數據
    returnencrypt;
  }

  privateint[] ReadDataToBirnaryIntArray(byte[] intdata) {
    inti;
    intj;

    // 將數據轉換爲二進制數，存儲到數組
    int[] IntDa = newint[8];

    for(i = 0; i< 8; i++) {
      IntDa[i] = intdata[i];

      if(IntDa[i]< 0) {
        IntDa[i] += 256;
        IntDa[i] %= 256;
      }
    }

    int[] IntVa = newint[64];

    for(i = 0; i< 8; i++) {
      for(j = 0; j< 8; j++) {
        IntVa[((i * 8) + 7) - j] = IntDa[i] % 2;
        IntDa[i] = IntDa[i] / 2;
      }
    }

    returnIntVa;
  }

  privatevoidLeftBitMove(int[] k, intoffset) {
    inti;

    // 循環移位操作函數
    int[] c0 = newint[28];
    int[] d0 = newint[28];
    int[] c1 = newint[28];
    int[] d1 = newint[28];

    for(i = 0; i< 28; i++) {
      c0[i] = k[i];
      d0[i] = k[i + 28];
    }

    if(offset == 1) {
      for(i = 0; i< 27; i++) { // 循環左移一位
        c1[i] = c0[i + 1];
        d1[i] = d0[i + 1];
      }

      c1[27] = c0[0];
      d1[27] = d0[0];
    }
    elseif(offset == 2) {
      for(i = 0; i< 26; i++) { // 循環左移兩位
        c1[i] = c0[i + 2];
        d1[i] = d0[i + 2];
      }

      c1[26] = c0[0];
      d1[26] = d0[0];
      c1[27] = c0[1];
      d1[27] = d0[1];
    }

    for(i = 0; i< 28; i++) {
      k[i] = c1[i];
      k[i + 28] = d1[i];
    }
  }

  privatevoidLoopF(int[] M, inttimes, intflag, int[][] keyarray) {
    inti;
    intj;
    int[] L0 = newint[32];
    int[] R0 = newint[32];
    int[] L1 = newint[32];
    int[] R1 = newint[32];
    int[] RE = newint[48];
    int[][] S = newint[8][6];
    int[] sBoxData = newint[8];
    int[] sValue = newint[32];
    int[] RP = newint[32];

    for(i = 0; i< 32; i++) {
      L0[i] = M[i]; // 明文左側的初始化
      R0[i] = M[i + 32]; // 明文右側的初始化
    }

    for(i = 0; i< 48; i++) {
      RE[i] = R0[E[i] - 1]; // 經過E變換擴充，由32位變爲48位
      RE[i] = RE[i] + keyarray[times][i]; // 與KeyArray[times][i]按位作不進位加法運算

      if(RE[i] == 2) {
        RE[i] = 0;
      }
    }

    for(i = 0; i< 8; i++) { // 48位分成8組

      for(j = 0; j< 6; j++) {
        S[i][j] = RE[(i * 6) + j];
      }

      // 下面經過S盒，得到8個數
      sBoxData[i] = S_Box[i][(S[i][0]<< 1) + S[i][5]][(S[i][1]<< 3)
          + (S[i][2]<< 2) + (S[i][3]<< 1) + S[i][4]];

      // 8個數變換輸出二進制
      for(j = 0; j< 4; j++) {
        sValue[((i * 4) + 3) - j] = sBoxData[i] % 2;
        sBoxData[i] = sBoxData[i] / 2;
      }
    }

    for(i = 0; i< 32; i++) {
      RP[i] = sValue[P[i] - 1]; // 經過P變換
      L1[i] = R0[i]; // 右邊移到左邊
      R1[i] = L0[i] + RP[i];

      if(R1[i] == 2) {
        R1[i] = 0;
      }

      // 重新合成M，返回數組M
      // 最後一次變換時，左右不進行互換。此處採用兩次變換實現不變
      if(((flag == 0)&& (times == 0)) || ((flag == 1)&& (times == 15))) {
        M[i] = R1[i];
        M[i + 32] = L1[i];
      }
      else{
        M[i] = L1[i];
        M[i + 32] = R1[i];
      }
    }
  }

  privatevoidGetEncryptResultOfByteArray(int[] data, byte[] value) {
    inti;
    intj;

    // 將存儲64位二進制數據的數組中的數據轉換爲八個整數（byte）
    for(i = 0; i< 8; i++) {
      for(j = 0; j< 8; j++) {
        value[i] += (data[(i<< 3) + j]<< (7- j));
      }
    }

    for(i = 0; i< 8; i++) {
      value[i] %= 256;

      if(value[i] > 128) {
        value[i] -= 255;
      }
    }
  }

  privatebyte[] ByteDataFormat(byte[] data, intflag) {
    intlen = data.length;
    intpadlen = 8- (len % 8);
    intnewlen = len + padlen;
    byte[] newdata = newbyte[newlen];
    System.arraycopy(data, 0, newdata, 0, len);

    for(inti = len; i< newlen; i++) {
      newdata[i] = (byte) padlen;
    }

    returnnewdata;
  }

  publicbyte[] DesEncrypt(byte[] des_data, intflag) {
    byte[] format_key = ByteDataFormat(bytekey, flag);
    byte[] format_data = ByteDataFormat(des_data, flag);
    intdatalen = format_data.length;
    intunitcount = datalen / 8;
    byte[] result_data = newbyte[datalen];

    for(inti = 0; i< unitcount; i++) {
      byte[] tmpkey = newbyte[8];
      byte[] tmpdata = newbyte[8];
      System.arraycopy(format_key, 0, tmpkey, 0, 8);
      System.arraycopy(format_data, i * 8, tmpdata, 0, 8);

      byte[] tmpresult = UnitDes(tmpkey, tmpdata, flag);
      System.arraycopy(tmpresult, 0, result_data, i * 8, 8);
    }

    // 當前爲解密過程，去掉加密時產生的填充位
    byte[] decryptbytearray = null;

    if(flag == 0) {
      inttotal_len = datalen;
      intdelete_len = result_data[total_len - 8- 1];
      delete_len = ((delete_len >= 1)&& (delete_len< = 8)) ? delete_len : 0;
      decryptbytearray = newbyte[total_len - delete_len - 8];

      booleandel_flag = true;

      for(intk = 0; k< delete_len; k++) {
        if(delete_len != result_data[total_len - 8- (k + 1)]) {
          del_flag = false;
        }
      }

          if(del_flag == true) {
        System.arraycopy(result_data, 0, decryptbytearray, 0, total_len
            - delete_len - 8);
      }
    }
    return(flag == 1) ? result_data : decryptbytearray;
  }
}