java中的3DES加密算法

package test;/* * 当前文件：ThreeDES.java * 作者：fenglingcompany */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 ThreeDES{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) {ThreeDES des = new ThreeDES();// 实例化一个对像des.getKey("fenglingcompany");// 生成密匙String strEnc = des.getEncString("fengye666666666");// 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);}}