개발 자 블 로그:
http://www.developsearch.com/**
* 、 cipher
* javax.crypto.*、java.security.*、org.apache.commons.codec.binary.Base64
* 、 。 , API , 、
* ; 、 JDK ;
*
* @author chenxin
* @version [ , 2012-5-21]
* @see [ / ]
* @since [ / ]
*/
public class CryptUtil {
/**
*
*/
private static final CryptUtil instance = new CryptUtil();
/**
* Base64
*/
private static final BASE64Decoder base64De = new BASE64Decoder();
/**
* Base64
*/
private static final BASE64Encoder base64En = new BASE64Encoder();
/**
*
* @author ahli
* @version IMPV100R001DA0, Nov 18, 2009
* @since CMS IMPV100R001DA0
*/
public enum CipherType{
AES,
DES
}
/**
* ,
*/
private CryptUtil()
{
};
/**
*
* @return
*/
public static CryptUtil getInstance()
{
return instance;
}
/**
*
* :“xjPk2rOSU1n5v70a84M+vw==”
* @return
*/
public String genRandomKeyStr(CipherType type)
{
SecretKey key;
try
{
key = KeyGenerator.getInstance(type.toString()).generateKey();
return base64En.encode(key.getEncoded());
}
catch (NoSuchAlgorithmException e)
{
return null;
}
}
/**
*
* @param str
* @param key
* @param type
* @return
*/
public String encrypt(String str, String key, CipherType type)
{
try
{
Cipher cipher = Cipher.getInstance(type.toString());
cipher.init(Cipher.ENCRYPT_MODE, initKey(type.toString(), key));
return new String(Base64.encodeBase64(cipher.doFinal(str.getBytes("UTF-8"))));
}
catch (IOException e)
{
e.printStackTrace();
}
catch (GeneralSecurityException e)
{
e.printStackTrace();
}
return null;
}
/**
*
* @param str
* @param key
* @param type
* @return
*/
public String decrypt(String str, String key, CipherType type)
{
try
{
Cipher cipher = Cipher.getInstance(type.toString());
cipher.init(Cipher.DECRYPT_MODE, initKey(type.toString(), key));
return new String(cipher.doFinal( base64De.decodeBuffer(str)), "UTF-8");
}
catch (IOException e)
{
e.printStackTrace();
}
catch (GeneralSecurityException e)
{
e.printStackTrace();
}
return null;
}
/**
*
* @param cryptType
* @param key
* @return
* @throws UnsupportedEncodingException
*/
private Key initKey(String cryptType, String key) throws UnsupportedEncodingException{
SecretKey secretKey = new SecretKeySpec(Base64.decodeBase64(key.getBytes("UTF-8")), cryptType);
return secretKey;
}
public static void main(String[] args)
{
// String randomKey = CryptUtil.getInstance().genRandomKeyStr(CipherType.AES);
String randomKey = "C1ZZsBNd0JY/8Yx2nPEg2g==";
System.out.println("randomKey:" + randomKey);
String message = "cms4a";
System.out.println(" :" + message);
String s1 = CryptUtil.getInstance().encrypt(message, randomKey, CipherType.AES);
System.out.println(" :" + s1);
String s2 = CryptUtil.getInstance().decrypt(s1, randomKey, CipherType.AES);
System.out.println(" :" + s2);
}
}