The encryption class:

package cn.com.smartcost.qy.util;

import java.security.Key;
import java.security.Security; import javax.crypto.Cipher; /**
* encrypt and decryption
* @author wangfeng
* @since 2013-4-27 15:50:26
* @version 1.0
*
*/
public class EncryptionDecryption {
private static String strDefaultKey = "wfkey"; //encrypt
private Cipher encryptCipher = null; // decryption
private Cipher decryptCipher = null; /**
* byte array to hexadecimal
* @param arrB
* @return 16
* @throws Exception
*/
public static String byteArr2HexStr(byte[] arrB) throws Exception{
int bLen = arrB.length;
//
StringBuffer strBuffer = new StringBuffer(bLen*2);
for(int i=0; i != bLen; ++i){
int intTmp = arrB[i];
//
while(intTmp < 0){
intTmp = intTmp + 256;//
}
//
if(intTmp < 16){
strBuffer.append("0");
}
strBuffer.append(Integer.toString(intTmp,16));
}
return strBuffer.toString();
} /**
* hex to byte array
* @param hexStr
* @return
* @throws Exception
*/
public static byte[] hexStr2ByteArr(String hexStr) throws Exception{
byte[] arrB = hexStr.getBytes();
int bLen = arrB.length;
byte[] arrOut = new byte[bLen/2];
for(int i=0; i<bLen; i = i+2){
String strTmp = new String(arrB,i,2);
arrOut[i/2] = (byte)Integer.parseInt(strTmp,16);
}
return arrOut;
} /**
* encrypt
* @throws Exception
*/
public EncryptionDecryption() throws Exception {
this(strDefaultKey);
} /**
* encryption
* @param strKey
* @throws Exception
*/
@SuppressWarnings("restriction")
public EncryptionDecryption(String strKey) throws Exception {
Security.addProvider(new com.sun.crypto.provider.SunJCE());
Key key = getKey(strKey.getBytes()); encryptCipher = Cipher.getInstance("DES");
encryptCipher.init(Cipher.ENCRYPT_MODE, key); decryptCipher = Cipher.getInstance("DES");
decryptCipher.init(Cipher.DECRYPT_MODE, key);
} /**
* encrypt
* @param arrB
* @return
* @throws Exception
*/
public byte[] encrypt(byte[] arrB) throws Exception{
return encryptCipher.doFinal(arrB);
} /**
* encrypt
* @param strIn
* @return
* @throws Exception
*/
public String encrypt(String strIn) throws Exception{
return byteArr2HexStr(encrypt(strIn.getBytes()));
} /**
* decrypt
* @param arrB
* @return
* @throws Exception
*/
public byte[] decrypt(byte[] arrB) throws Exception{
return decryptCipher.doFinal(arrB);
} /**
* decrypt
* @param strIn
* @return
* @throws Exception
*/
public String decrypt(String strIn) throws Exception{
try{
return new String(decrypt(hexStr2ByteArr(strIn)));
}catch (Exception e) {
return "";
}
} /**
* get the key
* @param arrBTmp
* @return
* @throws Exception
*/
private Key getKey(byte[] arrBTmp) throws Exception{
byte[] arrB = new byte[8]; //
for(int i=0; i<arrBTmp.length && i < arrB.length; ++i){
arrB[i] = arrBTmp[i];
} //
Key key = new javax.crypto.spec.SecretKeySpec(arrB,"DES");
return key;
} }

  Attention:

This class nees a jar:sunjce_provider.jar. u can download it from here: http://pan.baidu.com/s/1ntqkU4h

To use:

private EncryptionDecryption des = new  EncryptionDecryption("wang");
//encrypt
String password = "123456";
password = des.encrypt(password);
//decrypt
password =des.decrypt(password);

  

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