DES加解密

package tool;
import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class DesEncrypt{
 /**
  *
  * 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
  */

 Key key;

 /**
  * 根据参数生成KEY
  *
  * @param strKey
  */
 public void getKey(String strKey) {
  try {
   //解决linux服务器报错问题
   SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG" );
   secureRandom.setSeed(strKey.getBytes());

   KeyGenerator _generator = KeyGenerator.getInstance("DES");
   _generator.init(secureRandom);
   //   _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
  *
  * @param strMing
  * @return
  */
 public String getEncString(String strMing) {

  byte[] byteMi = null;
  byte[] byteMing = null;
  String strMi = "";
  BASE64Encoder base64en = new BASE64Encoder();
  try {
   byteMing = strMing.getBytes("UTF8");
   byteMi = this.getEncCode(byteMing);
   strMi = base64en.encode(byteMi);
  } catch (Exception e) {
   e.printStackTrace();
  } finally {
   base64en = null;
   byteMing = null;
   byteMi = null;
  }
  return strMi;
 }

 /**
  * 解密 以String密文输入,String明文输出
  *
  * @param strMi
  * @return
  */
 public String getDesString(String strMi) {
  BASE64Decoder base64De = new BASE64Decoder();
  byte[] byteMing = null;
  byte[] byteMi = null;
  String strMing = "";
  try {
   byteMi = base64De.decodeBuffer(strMi);
   byteMing = this.getDesCode(byteMi);
   strMing = new String(byteMing, "UTF8");
  } catch (Exception e) {
   e.printStackTrace();
   System.out.println("strMi:" + strMi + " byteMi:" + byteMi + " byteMing:" + byteMing + " strMing:" + strMing);
  } finally {
   base64De = null;
   byteMing = null;
   byteMi = null;
  }
  return strMing;
 }

 /**
  * 加密以byte[]明文输入,byte[]密文输出
  *
  * @param byteS
  * @return
  */
 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byte[]密文输入,以byte[]明文输出
  *
  * @param byteD
  * @return
  */
 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;
 }

}