package mac;

import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;

public class KeyGeneratorTool {   
    
    public static String getjihuoma() {
    	// Éú³É256λAESÃÜÔ¿
        SecretKey secretKey=null;
		try {
			secretKey = generateAESKey(256);
		} catch (NoSuchAlgorithmException e) {
			// TODO ×Ô¶¯Éú³ÉµÄ catch ¿é
			e.printStackTrace();
		}            
        // »ñÈ¡Base64±àÂëµÄÃÜÔ¿×Ö·û´®
        String base64Key = Base64.getEncoder().encodeToString(secretKey.getEncoded());
		return base64Key;
    }
    
    
    /**
     * Éú³ÉAESÃÜÔ¿
     * @param keySize ÃÜÔ¿³¤¶È(128, 192, »ò 256)
     */
    public static SecretKey generateAESKey(int keySize) throws NoSuchAlgorithmException {
        KeyGenerator keyGen = KeyGenerator.getInstance("AES");
        keyGen.init(keySize);
        return keyGen.generateKey();
    }

}