加密啊

package com.skmbw.util.cryption;

import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;

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

/**
* DES对称加密和解密方法
* @author yinlei
* date 2012-7-16 下午4:54:51
*/
public class DESUtils {
private static Key key;
private static String ENCRYPTION_KEY = "sKmBWVteFlFyiNLeI";

static {
try {
SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
random.setSeed(ENCRYPTION_KEY.getBytes());
KeyGenerator generator = KeyGenerator.getInstance("DES");
generator.init(random);//new SecureRandom(ENCRYPTION_KEY.getBytes()));
key = generator.generateKey();
generator = null;
//key = generateKey(ENCRYPTION_KEY);
} catch (Exception e) {
throw new RuntimeException(e);
}
}

/**
* 获得密钥
* @param secretKey 加密盐salt
* @return SecretKey密钥实例
* @throws NoSuchAlgorithmException
* @throws InvalidKeyException
* @throws InvalidKeySpecException
*/
protected static SecretKey generateKey(String secretKey) throws NoSuchAlgorithmException,InvalidKeyException,InvalidKeySpecException { 
     
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); 
    DESKeySpec keySpec = new DESKeySpec(secretKey.getBytes()); 
    keyFactory.generateSecret(keySpec); 
    return keyFactory.generateSecret(keySpec); 
}

/**
* 对字符串进行DES加密，并返回BASE64加密的字符创
* @param original 源字符
* @return 加密后的字符
* @author yinlei
* date 2012-7-16 下午4:55:30
*/
public static String getEncryptString(String original) {
try {
byte[] strBytes = original.getBytes();
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] encryptStrByte = cipher.doFinal(strBytes);
return EncodeUtils.base64Encode(encryptStrByte);
} catch (Exception e) {
throw new RuntimeException(e);
}
}

/**
* 对DES加密和BASE64加密后的字符解密
* @param encryptStr 加密过的字符
* @return 解密后的原始字符
* @author yinlei
* date 2012-7-16 下午4:56:45
*/
public static String getDecryptString(String encryptStr) {
try {
byte[] strBytes = EncodeUtils.base64Decode(encryptStr);
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] decryptStrByte = cipher.doFinal(strBytes);
return new String(decryptStrByte, "UTF-8");
} catch (Exception e) {
throw new RuntimeException(e);
}
}

public static void main(String[] args) {
String str = "root";
String pass = "0558yinlei3416763";
String enstr = getEncryptString(str);
String enpass = getEncryptString(pass);
System.out.println(enstr);
System.out.println(enpass);
System.out.println(getDecryptString(enstr));
System.out.println(getDecryptString(enpass));
}
}