一个用java写的加密解密程序

import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;

//import com.modernmedia.mw.tag.Messages;

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

public class Crypt {// --------------------------------------------------------------------------------------------// 获得密钥public SecretKey getKey(String s) throws Exception {//s ="g8TlgLEc6oqZxdwGe6pDiKB8Y";System.out.println("s=="+s);char[] ss = s.toCharArray();String sss="";    for(int i = 0;i<ss.length;i=i+2)    {    sss = sss + ss[i];    }SecretKeyFactory kf = SecretKeyFactory.getInstance("DES");DESKeySpec ks = new DESKeySpec(sss.substring(0,8).getBytes());SecretKey kd = kf.generateSecret(ks);return kd;}

// --------------------------------------------------------------------------------------------------// 返回加密后的字符串// key是用于生成密钥的字符串，input是要加密的字符串public String getEncryptedString(String key, String input) {String base64 = "";try {Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");cipher.init(Cipher.ENCRYPT_MODE, getKey(key));System.out.print("getKey(key)==="+getKey(key)+"key=="+key);byte[] inputBytes = input.getBytes("UTF8");byte[] outputBytes = cipher.doFinal(inputBytes);BASE64Encoder encoder = new BASE64Encoder();base64 = encoder.encode(outputBytes);} catch (Exception e) {base64 = e.getMessage();}return base64;}

// --------------------------------------------------------------------------------------------------// 返回解密后的字符串// key是用于生成密钥的字符串，input是要解密的字符串public String getDecryptedString(String key, String input) {String result = null;try {Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");cipher.init(Cipher.DECRYPT_MODE, getKey(key));BASE64Decoder decoder = new BASE64Decoder();byte[] raw = decoder.decodeBuffer(input);byte[] stringBytes = cipher.doFinal(raw);result = new String(stringBytes, "UTF8");} catch (Exception e) {result = e.getMessage();}return result;}

public static void main(String[] args){Crypt mycrypt = new Crypt();try {//SecretKey skey = mycrypt.getKey("g8TlgLEc6oqZxdwGe6pDiKB8Y");String ss = mycrypt.getEncryptedString("6678912345678906", "胖子");System.out.println("ss=="+ss);String ss2 = mycrypt.getDecryptedString("6678912345678906",ss);System.out.println("ss2=="+ss2);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}

//String ss = Messages.getString("SendToMemberTag.5");//System.out.print(ss);