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。