java MD5,DES加密，解密

package common;

import javax.crypto.*;

import java.io.*;
import java.security.*;

public class Encrypter
{

private Cipher ecipher;
private Cipher dcipher;

// md5编码
public static String md5Encrypt(String s) throws Exception
{

MessageDigest md5 = MessageDigest.getInstance("MD5");

sun.misc.BASE64Encoder base64Encoder = new sun.misc.BASE64Encoder();

return base64Encoder.encode(md5.digest(s.getBytes("utf-8")));

}

public Encrypter()
{
try
{
SecretKey key = KeyGenerator.getInstance("DES").generateKey();
ecipher = Cipher.getInstance("DES");
dcipher = Cipher.getInstance("DES");
ecipher.init(Cipher.ENCRYPT_MODE, key);
dcipher.init(Cipher.DECRYPT_MODE, key);

}
catch (javax.crypto.NoSuchPaddingException e)
{
}
catch (java.security.NoSuchAlgorithmException e)
{
}
catch (java.security.InvalidKeyException e)
{
}
}

// DES编码
public String desEncrypt(String s)
{
try
{
byte[] utf8 = s.getBytes("UTF8");

byte[] enc = ecipher.doFinal(utf8);

return new sun.misc.BASE64Encoder().encode(enc);
}
catch (javax.crypto.BadPaddingException e)
{
}
catch (IllegalBlockSizeException e)
{
}
catch (UnsupportedEncodingException e)
{
}
catch (java.io.IOException e)
{
}
return null;
}

// DES解码
public String desDecrypt(String s)
{
try
{
byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(s);

// 解码
byte[] utf8 = dcipher.doFinal(dec);

return new String(utf8, "UTF8");
}
catch (javax.crypto.BadPaddingException e)
{
}
catch (IllegalBlockSizeException e)
{
}
catch (UnsupportedEncodingException e)
{
}
catch (java.io.IOException e)
{
}
return null;
}

}

From：一号门