AES加密算法的java实现.docx

packagecom.encryp;

importjava.security.InvalidKeyException;
importjava.security.NoSuchAlgorithmException;
importjava.security.Security;

importjavax.crypto.BadPaddingException;
importjavax.crypto.Cipher;
importjavax.crypto.IllegalBlockSizeException;
importjavax.crypto.KeyGenerator;
importjavax.crypto.NoSuchPaddingException;
importjavax.crypto.SecretKey;

publicclassEncrypAES{

//KeyGenerator提供对称密钥生成器的功能，支持各种算法
privateKeyGeneratorkeygen;

//SecretKey负责保存对称密钥
privateSecretKeydeskey;

//Cipher负责完成加密或解密工作
privateCipherc;

//该字节数组负责保存加密的结果
privatebyte[]cipherByte;

publicEncrypAES()throwsNoSuchAlgorithmException,NoSuchPaddingException{
Security.addProvider(newcom.sun.crypto.provider.SunJCE());
//实例化支持DES算法的密钥生成器(算法名称命名需按规定，否则抛出异常)
keygen=KeyGenerator.getInstance("AES");
//生成密钥
deskey=keygen.generateKey();
//生成Cipher对象,指定其支持的DES算法
c=Cipher.getInstance("AES");
}

/**
*对字符串加密
*
*@paramstr
*@return
*@throwsInvalidKeyException
*@throwsIllegalBlockSizeException
*@throwsBadPaddingException
*/
publicbyte[]Encrytor(Stringstr)throwsInvalidKeyException,IllegalBlockSizeException,BadPaddingException{
//根据密钥，对Cipher对象进行初始化，ENCRYPT_MODE表示加密模式
c.init(Cipher.ENCRYPT_MODE,deskey);
byte[]src=str.getBytes();
//加密，结果保存进cipherByte
cipherByte=c.doFinal(src);
returncipherByte;
}

/**
*对字符串解密
*
*@parambuff
*@return
*@throwsInvalidKeyException
*@throwsIllegalBlockSizeException
*@throwsBadPaddingException
*/
publicbyte[]Decryptor(byte[]buff)throwsInvalidKeyException,IllegalBlockSizeException,BadPaddingException{
//根据密钥，对Cipher对象进行初始化，DECRYPT_MODE表示加密模式
c.init(Cipher.DECRYPT_MODE,deskey);
cipherByte=c.doFinal(buff);
returncipherByte;
}

/**
*@paramargs
*@throwsNoSuchPaddingException
*@throwsNoSuchAlgorithmException
*@throwsBadPaddingException
*@throwsIllegalBlockSizeException
*@throwsInvalidKeyException
*/
publicstaticvoidmain(String[]args)throwsException{
EncrypAESde1=newEncrypAES();
Stringmsg="郭XX-搞笑相声全集";
byte[]encontent=de1.Encrytor(msg);
byte[]decontent=de1.Decryptor(encontent);
System.out.pr