java之yield(),sleep(),wait()区别详解

 

 

/**
* 私钥加密的对称算法
*
* @author yajun.wuyj
*/
public class PrivateExample {
public static void main(String[] args) throws Exception {

String text = "世界平衡";

byte[] plainText = text.getBytes("UTF8");

//通过KeyGenerator形成一个key
System.out.println("\nStart generate AES key");
KeyGenerator keyGen = KeyGenerator.getInstance("AES");

keyGen.init(128);
Key key = keyGen.generateKey();
System.out.println("Finish generating DES key");

//获得一个私鈅加密类Cipher，ECB是加密方式，PKCS5Padding是填充方法
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
System.out.println("\n" + cipher.getProvider().getInfo());

//使用私鈅加密
System.out.println("\nStart encryption:");
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] cipherText = cipher.doFinal(plainText);
System.out.println("Finish encryption:");
System.out.println(new String(cipherText, "UTF8"));

System.out.println("\nStart decryption:");
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] newPlainText = cipher.doFinal(cipherText);
System.out.println("Finish decryption:");

System.out.println(new String(newPlainText, "UTF8"));
}

}

 

其中KeyGenerator是专门生成密钥的类。区别于KeyPairGenerator生成的是密钥对。

通过他的getInstance可以获取如下的算法需要的Key。

KeyGenerator

The following algorithm names can be specified when requesting an instance of

KeyGenerator

:

 

AES
 

ARCFOUR/RC4
 

Blowfish
 

DES
 

DESede
 

HmacMD5
 

HmacSHA1
 

HmacSHA256
 

HmacSHA384
 

HmacSHA512
 

RC2

 

Cipher.getInstance() 参数可以用一下形式的参数

 

"algorithm/mode/padding"
 

"algorithm"

 

mode 模式详见：/article/4870514.html

 

或者官方一点的：http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation

 

padding 填充模式详见：http://www.cnblogs.com/midea0978/articles/1437257.html

具体所有已经可以用的algorithm详见官方网站：

http://java.sun.com/javase/6/docs/technotes/guides/security/SunProviders.html