AES加密--适用于RC2、RC4和Blowfish

package test;

import java.security.GeneralSecurityException;

import java.security.Key;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;

import javax.crypto.spec.SecretKeySpec;

public class AESCoder
{

        public static final String KEY_ALGORITHM= "AES";

       

        public static final String CIPHER_ALGORITHM= "AES/EBC/PKCS5Padding";

       

        //密钥算法

        private static Key
toKey(byte[] key){

              SecretKey secretkey = new SecretKeySpec(key,KEY_ALGORITHM);

               return secretkey;

       }

       

        public static byte[]
decrypt(byte[] data, byte[]
key) throws Exception, GeneralSecurityException{

              Key k= toKey(key);

              Cipher cipher=Cipher. getInstance(CIPHER_ALGORITHM);

              cipher.init(Cipher. DECRYPT_MODE,
k);

               return cipher.doFinal(data);

       }

       

        public static byte[]
encrytp(byte[] data, byte[]
key) throws Exception, GeneralSecurityException{

              

              Key k= toKey(key);

              

              Cipher cipher=Cipher. getInstance(CIPHER_ALGORITHM);

              

              cipher.init(Cipher. ENCRYPT_MODE,
k);

               return cipher.doFinal(data);

       }

       

        public static byte[]
initKey() throws Exception{

              KeyGenerator kg=KeyGenerator. getInstance(KEY_ALGORITHM);

              kg.init(256);

              SecretKey secretKey=kg.generateKey();

               //获取密钥的二进制编码形式

               return secretKey.getEncoded();

       }

}

对密钥规范的要求降低了，无需实现密钥规范类。