import?java.security.Key;
import?java.security.SecureRandom;

import?javax.crypto.Cipher;
import?javax.crypto.KeyGenerator;
import?javax.crypto.SecretKey;
import?javax.crypto.SecretKeyFactory;
import?javax.crypto.spec.DESKeySpec;
import?javax.crypto.spec.SecretKeySpec;



public?abstract?class?AESCoder?extends?Coder?{
	/**
	?*?ALGORITHM?算法?
	?*?可替換為以下任意一種算法，同時key值的size相應(yīng)改變。
	?*?DES??????????		key?size?must?be?equal?to?56
	?*?DESede（TripleDES）?	key?size?must?be?equal?to?112?or?168
	?*?AES??????????		key?size?must?be?equal?to?128?192?or?256but?192?and?256?bits?may?not?be?available
	?*?Blowfish?????		key?size?must?be?multiple?of?8?and?can?only?range?from?32?to?448?（inclusive）
	?*?RC2??????????		key?size?must?be?between?40?and?1024?bits
	?*?RC4（ARCFOUR）?		key?size?must?be?between?40?and?1024?bits
	?*?在Key?toKey（byte[]?key）方法中使用下述代碼
	?*?SecretKey?secretKey?=?new?SecretKeySpec（key?ALGORITHM）;替換
	?*?DESKeySpec?dks?=?new?DESKeySpec（key）;
	?*?SecretKeyFactory?keyFactory?=?SecretKeyFactory.getInstance（ALGORITHM）;
	?*?SecretKey?secretKey?=?keyFactory.generateSecret（dks）;
	?*/
	public?static?final?String?ALGORITHM?=?“AES“;

	/**
	?*?轉(zhuǎn)換密鑰

	?*?
	?*?@param?key
	?*?@return
	?*?@throws?Exception
	?*/
	private?static?Key?toKey（byte[]?key）?throws?Exception?{
	/*
	?*?	DESKeySpec?dks?=?new?DESKeySpec（key）;
		SecretKeyFactory?keyFactory?=?SecretKeyFactory.getInstance（ALGORITHM）;
		SecretKey?secretKey?=?keyFactory.generateSecret（dks）;
??????*/
		//?當使用其他對稱加密算法時，如AES、Blowfish等算法時，用下述代碼替換上述三行代碼
		SecretKey?secretKey?=?new?SecretKeySpec（key?ALGORITHM）;

		return?secretKey;
	}

	/**
	?*?解密
	?*?
	?*?@param?data
	?*?@param?key
	?*?@return
	?*?@throws?Exception
	?*/
	public?static?byte[]?decrypt（byte[]?data?String?key）?throws?Exception?{
		Key?k?=?toKey（decryptbase64（key））;

		Cipher?cipher?=?Cipher.getInstance（ALGORITHM）;
		cipher.init（Cipher.DECRYPT_MODE?k）;

		return?cipher.doFinal（data）;
	}

	/**
	?*?加密
	?*?
	?*?@param?data
	?*?@param?key
	?*?@return
	?*?@throws?Exception
	?*/
	public?static?byte[]?encrypt（byte[]?data?String?key）?throws?Exception?{
		Key?k?=?toKey（decryptbase64（key））;
		Cipher?cipher?=?Cipher.getInstance（ALGORITHM）;
		cipher.init（Cipher.ENCRYPT_MODE?k）;

		return?cipher.doFinal（data）;
	}

	/**
	?*?生成密鑰
	?*?
	?*?@return
	?*?@throws?Exception
	?*/
	public?static?String?initKey（）?throws?Exception?{
		return?initKey（null）;
	}

	/**
	?*?生成密鑰
	?*?
	?*?@param?seed
	?*?@return
	?*?@throws?Exception
	?*/
	public?static?String?initKey（String?seed）?throws?Exception?{
		SecureRandom?secureRandom?=?null;

		if?（seed?!=?null）?{
			secureRandom?=?new?SecureRandom（decryptbase64（seed））;
		}?else?{
			secureRandom?=?new?SecureRandom（）;
		}

		KeyGenerator?kg?=?KeyGenerator.getInstance（ALGORITHM）;
		kg.init（secureRandom）;

		SecretKey?secretKey?=?kg.generateKey（）;

		return?encryptbase64（secretKey.getEncoded（））;
	}
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????301??2014-05-07?16:32??RSAwithAES\.classpath

?????文件????????386??2014-05-07?16:32??RSAwithAES\.project

?????文件????????629??2014-05-07?16:32??RSAwithAES\.settings\org.eclipse.jdt.core.prefs

?????文件???????2002??2014-05-07?16:55??RSAwithAES\bin\AESCoder.class

?????文件???????2121??2014-05-07?16:54??RSAwithAES\bin\Coder.class

?????文件???????4949??2014-05-07?16:54??RSAwithAES\bin\RSACoder.class

?????文件???????2353??2014-05-07?16:55??RSAwithAES\bin\RSAwithAESTest.class

?????文件???????3055??2014-05-07?16:55??RSAwithAES\src\AESCoder.java

?????文件???????2162??2014-05-07?15:46??RSAwithAES\src\Coder.java

?????文件???????6324??2014-05-07?16:24??RSAwithAES\src\RSACoder.java

?????文件???????1580??2014-05-07?16:55??RSAwithAES\src\RSAwithAESTest.java

?????目錄??????????0??2014-05-07?16:56??RSAwithAES\.settings

?????目錄??????????0??2014-05-07?16:56??RSAwithAES\bin

?????目錄??????????0??2014-05-07?16:56??RSAwithAES\src

?????目錄??????????0??2014-05-07?16:56??RSAwithAES

-----------?---------??----------?-----??----

????????????????25862????????????????????15