用JAVA实现的DES加密解密算法

package Encrypt;
import java.security.*;
import javax.crypto.*;
import sun.misc.*;
/**
    *   使用DES加密与解密,可对byte[],String类型进行加密与解密
    *   密文可使用String,byte[]存储.
    *   方法:
    *   void getKey(String   strKey)从strKey的字条生成一个Key
    *   String getEncString(String strMing)对strMing进行加密,返回String密文
    *   String getDesString(String strMi)对strMin进行解密,返回String明文
    *   byte[] getEncCode(byte[] byteS)byte[]型的加密
    *   byte[] getDesCode(byte[] byteD)byte[]型的解密
    */
public class Encrypt{
  private Key key;
  private byte[] byteMi = null;
  private byte[] byteMing = null;
  private String strMi= "";
  private String strM= "";
  //  根据参数生成KEY
  public void setKey(String strKey){
   try{
        KeyGenerator _generator = KeyGenerator.getInstance("DES");
        _generator.init(new SecureRandom(strKey.getBytes()));
        this.key = _generator.generateKey();
        _generator=null;
        }
    catch(Exception e){
     e.printStackTrace();
     }

    }
  //  加密String明文输入,String密文输出
  public void setEncString(String strMing){
   BASE64Encoder base64en = new BASE64Encoder();
    try {
     this.byteMing = strMing.getBytes("UTF8");
      this.byteMi = this.getEncCode(this.byteMing);
      this.strMi = base64en.encode(this.byteMi);
     }
    catch(Exception e)
    {
     e.printStackTrace();
     }
   finally
     {

      this.byteMing = null;
      this.byteMi = null;
      }
  }
  //加密以byte[]明文输入,byte[]密文输出
  private byte[] getEncCode(byte[] byteS){
   byte[] byteFina = null;
    Cipher cipher;
    try
     {
      cipher = Cipher.getInstance("DES");
      cipher.init(Cipher.ENCRYPT_MODE,key);
      byteFina = cipher.doFinal(byteS);
      }
    catch(Exception e)
     {
      e.printStackTrace();
      }
    finally
    {
     cipher = null;
     }

   return byteFina;
  }
// 解密:以String密文输入,String明文输出
  public void setDesString(String strMi){
   BASE64Decoder base64De = new BASE64Decoder();
    try
    {
     this.byteMi = base64De.decodeBuffer(strMi);
      this.byteMing = this.getDesCode(byteMi);
      this.strM = new String(byteMing,"UTF8");
      }
    catch(Exception e)
     {
      e.printStackTrace();
      }
    finally
     {
      base64De = null;
      byteMing = null;
      byteMi = null;
      }  

  }
  // 解密以byte[]密文输入,以byte[]明文输出
 private byte[] getDesCode(byte[] byteD){
   Cipher cipher;
    byte[] byteFina=null;
    try{
     cipher = Cipher.getInstance("DES");
      cipher.init(Cipher.DECRYPT_MODE,key);
      byteFina = cipher.doFinal(byteD);
      }
   catch(Exception e)
     {
      e.printStackTrace();
      }
   finally
     {
      cipher=null;
      }
    return byteFina;
  }
  //返回加密后的密文strMi
  public String getStrMi()
  {
   return strMi;
  }
  //返回解密后的明文
  public String getStrM()
  {
   return strM;
  }
 }  

用JAVA实现的DES加密解密算法