Java security KeyStore Cipher

http://docs.oracle.com/javase/7/docs/technotes/guides/security/crypto/CryptoSpec.html

 

		//c:\Program Files\Java\jdk1.7.0_01\bin>keytool.exe -genkeypair -alias alex -keyalg RSA -keysize 1024 -storepass 123456 -v
		
		KeyStore keyStore = KeyStore.getInstance("jks");
		char[] password = "123456".toCharArray();
		keyStore.load(new FileInputStream("c:/users/administrator/.keystore"), password);
		Enumeration<String> aliases = keyStore.aliases();
		while(aliases.hasMoreElements()){
			String element = aliases.nextElement();
			System.out.println(element);
		}
		String alias = "alex";
		Certificate cer = keyStore.getCertificate(alias);
		String s = cer.toString();
		System.out.println(s);
		System.out.println("public key algorithm:"+cer.getPublicKey().getAlgorithm());
		Cipher cipher = Cipher.getInstance(cer.getPublicKey().getAlgorithm());
		cipher.init(Cipher.ENCRYPT_MODE, cer);
		byte[] msg = cipher.doFinal("hello alex".getBytes());
		System.out.println("encrypt result:"+new String(msg));
		
		Key key = keyStore.getKey(alias, password);
		String algorithm = key.getAlgorithm();
		System.out.println("key algorithm:"+algorithm);
		cipher = Cipher.getInstance(algorithm);
		cipher.init(Cipher.DECRYPT_MODE, key);
		byte[] result = cipher.doFinal(msg);
		System.out.println("decrypt result:"+new String(result));