demojce.java

通过sun提过的api对数据进行加密与解密的例子大家可以参考一下

import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;


public class DemoJCE{
	public static void main(String args[]){
		try{
			System.out.println("Getting Key generator...");
			KeyGenerator kgen = KeyGenerator.getInstance("Blowfish");
			
			System.out.println("Generating key ... ");
			SecretKey secretKey= kgen.generateKey();
			byte[] bytes = secretKey.getEncoded();
			SecretKeySpec specKey = new SecretKeySpec(bytes,"Blowfish");
			
			//
			//Create the cipher object.
			//
			System.out.println("Creating cipher ... ");
			Cipher cipher = Cipher.getInstance("Blowfish");
			System.out.println("Encryptin ... ");
			cipher.init(Cipher.ENCRYPT_MODE,specKey);
			String target = "Encrypt this buddy.";
			byte[] encrypted = cipher.doFinal(target.getBytes());
			
			System.out.println("beford: "+ target);
			System.out.println("after:"+new String(encrypted));
			
			//Decrypt
			cipher.init(Cipher.DECRYPT_MODE,specKey);
			byte[] decrypted=cipher.doFinal(encrypted);
			System.out.println("\nafter decrypt:"+new String(decrypted));
			
		}catch(Exception ex){
			System.out.println("Exception caught:"+ ex);
		}
	}
}