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package security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import java.security.Key;
/**
* ´ËÀý×ÓÊǶÔÒ»¸ö×Ö·û´®ÐÅÏ¢£¬ÓÃÒ»¸ö˽Կ(key)¼ÓÃÜ£¬È»ºóÔÚÓøÃ˽Կ½âÃÜ£¬ÑéÖ¤ÊÇ·ñÒ»ÖÂ
* ˽Կ¼ÓÃÜ£¬ÊǶԳƼÓÃÜ
* ʹÓöԳÆËã·¨¡£±ÈÈ磺AÓÃÒ»¸öÃÜÔ¿¶ÔÒ»¸öÎļþ¼ÓÃÜ£¬¶øB¶ÁÈ¡Õâ¸öÎļþµÄ»°£¬ÔòÐèÒªºÍAÒ»ÑùµÄÃÜÔ¿£¬Ë«·½¹²ÏíÒ»
* ¸ö˽Կ£¨¶øÔÚweb»·¾³Ï£¬Ë½Ô¿ÔÚ´«µÝʱÈÝÒ×±»ÕìÌý£©
*
* ¸½£ºÖ÷Òª¶Ô³ÆËã·¨ÓУºDES£¨Êµ¼ÊÃÜÔ¿Ö»Óõ½56 룩
* AES£¨Ö§³ÖÈýÖÖÃÜÔ¿³¤¶È£º128¡¢192¡¢256룩£¬Í¨³£Ê×ÏÈ128룬ÆäËûµÄ»¹ÓÐDESedeµÈ
*/
public class PrivateKey {
public static void main(String[] args) throws Exception {
String before = "asdf";
byte[] plainText = before.getBytes("UTF8");
//1²½**********************************************************************
System.out.println("Start generate AES key.");
//µÃµ½Ò»¸öʹÓÃAESËã·¨µÄKeyGeneratorµÄʵÀý
KeyGenerator keyGen = KeyGenerator.getInstance("AES");
//¶¨ÒåÃÜÔ¿³¤¶È128λ
keyGen.init(128);
//ͨ¹ýKeyGenerator²úÉúÒ»¸ökey£¨ÃÜÔ¿Ëã·¨¸Õ²ÅÒѶ¨Ò壬ΪAES£©
Key key = keyGen.generateKey();
System.out.println("Finish generating AES key."+key);
//2²½**********************************************************************
//»ñµÃÒ»¸ö˽Կ¼ÓÃÜÀàCipher£¬¶¨ÒåCipherµÄ»ù±¾ÐÅÏ¢£ºECBÊǼÓÃÜ·½Ê½£¬PKCS5PaddingÊÇÌî³ä·½·¨
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
// System.out.println("\n" + cipher.getProvider().getInfo());
//3²½**********************************************************************
//ʹÓÃ˽Կ¼ÓÃÜ
System.out.println("\nÓÃ˽Կ¼ÓÃÜ...");
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