3DES加密java的实现代码

/* * 当前文件：DesEncrypt.java * 创建日期：2005-7-29 * 版 本 号：1.0 * 作者：kang1 *  */

import java.security.Key;import java.security.SecureRandom;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;

import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;

/** *  * 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 DesEncrypt{Key key;

/** * 根据参数生成KEY * @param strKey */public void getKey(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 * @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();}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;

}

public static void main(String[] args){  System.out.println("hello"); DesEncrypt des=new DesEncrypt();//实例化一个对像 des.getKey("aadd");//生成密匙

 String strEnc = des.getEncString("钟汉康");//加密字符串,返回String的密文 System.out.println(strEnc);

 String strDes = des.getDesString(strEnc);//把String 类型的密文解密 System.out.println(strDes);

}

}