back.java

我学密码学时做的作业

package des;

public class back {

  /* Table - s1 */
  protected static byte[][] 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 */
  protected static byte[][] 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 */
  protected static byte[][] 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 */
  protected static byte[][] 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 */
  protected static byte[][] 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 */
  protected static byte[][] 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 */
  protected static byte[][] 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 */
  protected static byte[][] 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}};

  //用于 S盒查找以确定对应的4位二进制数据＃
  protected static byte[] binary={
        0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 1,
        0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1,
        1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1,
        1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1 };


  /**
   * 最终生成的密文或解密所得的明文
   */
  protected byte[] output=new byte[64];

  /**
   * 存储将要加密的明文或将要解密的密文
   */
  protected byte[] workData=new byte[64];


 // protected String dataDest;

  //用于数据变换中转
  protected byte[] bufout=new byte[64];

  protected byte[] Ln=new byte[32];
  protected byte[] Rn=new byte[32];
  protected byte[] LR=new byte[32];

  protected byte[] ER=new byte[48];
  protected byte[] temp=new byte[32];
  protected byte[] result=new byte[8];

  protected byte[] ki;

 // protected int readLen;
  protected boolean encFlag;   //1为加密，0为解密
  protected SubKey subKey;


  public back(){

    subKey=new SubKey();

  }

  public back(String key){
     subKey=new SubKey();
     subKey.setInkey(key);
     subKey.setSubKey();
  }

  public void setKey(byte[] inKey){
      subKey.setInKey(inKey);
      subKey.setSubKey();
  }

  //输入
  public void setWorkData(byte[] workData){
      this.workData=workData;
  }

  //输出
  public byte[] getOutput(){
      return this.output;
  }

  /**
  protected void convert4CharTo64bit(String data){
          for (int i = 0; i<64; i++) {
                  workData[i]=0;
        }
        /* Convert from 4-char(coded in unicode) data into 64-bit data */

  /**      for (int i = 0; i < readLen; i++) {
                int j=data.charAt(i);
                workData[16*i+0]=(byte)((j/32768)%2);
                  workData[16*i+1]=(byte)((j/16384)%2);
                  workData[16*i+2]=(byte)((j/8192)%2);
                  workData[16*i+3]=(byte)((j/4096)%2);
                  workData[16*i+4]=(byte)((j/2048)%2);
                  workData[16*i+5]=(byte)((j/1024)%2);
                  workData[16*i+6]=(byte)((j/512)%2);
                  workData[16*i+7]=(byte)((j/256)%2);
                  workData[16*i+8]=(byte)((j/128)%2);
                  workData[16*i+9]=(byte)((j/64)%2);
                  workData[16*i+10]=(byte)((j/32)%2);
                  workData[16*i+11]=(byte)((j/16)%2);
                  workData[16*i+12]=(byte)((j/8)%2);
                  workData[16*i+13]=(byte)((j/4)%2);
                  workData[16*i+14]=(byte)((j/2)%2);
                  workData[16*i+15]=(byte)(j%2);
         }
  }

  protected void convert64bitTo4Char(){
        int j;
        char ch;
        StringBuffer strbuf=new StringBuffer();
        for (int i = 0; i<4; i++) {
                j=0;
                j=32768*output[16*i+0]+16384*output[16*i+1]+8192*output[16*i+2]+4096*output[16*i+3]+
                2048*output[16*i+4]+1024*output[16*i+5]+512*output[16*i+6]+256*output[16*i+7]+
                128*output[16*i+8]+64*output[16*i+9]+32*output[16*i+10]+16*output[16*i+11]+
                8*output[16*i+12]+4*output[16*i+13]+2*output[16*i+14]+output[16*i+15];
                ch=(char)j;
                strbuf.append(ch);
        }
        dataDest=strbuf.toString();
}**/
  /**
   for(int i=0;i<64;i++){
     System.out.print(z[i]+"-");
    }
    System.out.println("aa");
    des1.setWorkData(z);
    des1.dec();
    z=des1.getOutput();
    for(int i=0;i<64;i++){
      System.out.print(z[i]+"-");
    }
    System.out.println("aa");
    des1.setWorkData(z);
    des1.enc();
    z=des1.getOutput();
    for(int i=0;i<64;i++){
     System.out.print(z[i]+"-");
    }**/



  /**
  * 初始置换
  */
  protected void IP(){
          /* Initial Permutation of Data */
        bufout[ 0] = workData[57];
        bufout[ 1] = workData[49];
        bufout[ 2] = workData[41];
        bufout[ 3] = workData[33];
        bufout[ 4] = workData[25];
        bufout[ 5] = workData[17];
        bufout[ 6] = workData[ 9];
        bufout[ 7] = workData[ 1];
        bufout[ 8] = workData[59];
        bufout[ 9] = workData[51];
        bufout[10] = workData[43];
        bufout[11] = workData[35];
        bufout[12] = workData[27];
        bufout[13] = workData[19];
        bufout[14] = workData[11];
        bufout[15] = workData[ 3];
        bufout[16] = workData[61];
        bufout[17] = workData[53];
        bufout[18] = workData[45];
        bufout[19] = workData[37];
        bufout[20] = workData[29];
        bufout[21] = workData[21];
        bufout[22] = workData[13];
        bufout[23] = workData[ 5];
        bufout[24] = workData[63];
        bufout[25] = workData[55];
        bufout[26] = workData[47];
        bufout[27] = workData[39];
        bufout[28] = workData[31];
        bufout[29] = workData[23];
        bufout[30] = workData[15];
        bufout[31] = workData[ 7];
        bufout[32] = workData[56];
        bufout[33] = workData[48];
        bufout[34] = workData[40];
        bufout[35] = workData[32];
        bufout[36] = workData[24];
        bufout[37] = workData[16];
        bufout[38] = workData[ 8];
        bufout[39] = workData[ 0];
        bufout[40] = workData[58];
        bufout[41] = workData[50];
        bufout[42] = workData[42];
        bufout[43] = workData[34];
        bufout[44] = workData[26];
        bufout[45] = workData[18];
        bufout[46] = workData[10];
        bufout[47] = workData[ 2];
        bufout[48] = workData[60];
        bufout[49] = workData[52];
        bufout[50] = workData[44];
        bufout[51] = workData[36];
        bufout[52] = workData[28];
        bufout[53] = workData[20];
        bufout[54] = workData[12];
        bufout[55] = workData[ 4];
        bufout[56] = workData[62];
        bufout[57] = workData[54];
        bufout[58] = workData[46];
        bufout[59] = workData[38];
        bufout[60] = workData[30];
        bufout[61] = workData[22];
        bufout[62] = workData[14];
        bufout[63] = workData[ 6];

  }

  protected void XOR(byte[] op1,byte[] op2){
          int len=op1.length;
          for (int i = 0; i<len; i++) {
                  op1[i]=(byte)(op1[i] ^ op2[i]);
        }
  }

  protected void expand32To48bit(byte[] op){
          /* Permute - E */
        ER[ 0] = op[31];
        ER[ 1] = op[ 0];
        ER[ 2] = op[ 1];
        ER[ 3] = op[ 2];
        ER[ 4] = op[ 3];
        ER[ 5] = op[ 4];
        ER[ 6] = op[ 3];
        ER[ 7] = op[ 4];
        ER[ 8] = op[ 5];
        ER[ 9] = op[ 6];
        ER[10] = op[ 7];
        ER[11] = op[ 8];
        ER[12] = op[ 7];
        ER[13] = op[ 8];
        ER[14] = op[ 9];
        ER[15] = op[10];
        ER[16] = op[11];
        ER[17] = op[12];
        ER[18] = op[11];
        ER[19] = op[12];
        ER[20] = op[13];
        ER[21] = op[14];
        ER[22] = op[15];
        ER[23] = op[16];
        ER[24] = op[15];
        ER[25] = op[16];
        ER[26] = op[17];
        ER[27] = op[18];
        ER[28] = op[19];
        ER[29] = op[20];
        ER[30] = op[19];
        ER[31] = op[20];
        ER[32] = op[21];
        ER[33] = op[22];
        ER[34] = op[23];
        ER[35] = op[24];
        ER[36] = op[23];
        ER[37] = op[24];
        ER[38] = op[25];
        ER[39] = op[26];
        ER[40] = op[27];
        ER[41] = op[28];
        ER[42] = op[27];
        ER[43] = op[28];