AES

import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.SecretKeySpec; import javax.crypto.spec.IvParameterSpec;

import sun.misc.BASE64Encoder;

public class AES { private IvParameterSpec ivSpec; private SecretKeySpec keySpec;

public AES(String key) {
	try {
		byte[] keyBytes = key.getBytes();
		byte[] buf = new byte[16];

		for (int i = 0; i < keyBytes.length && i < buf.length; i++) {
			buf[i] = keyBytes[i];
		}
		
		this.keySpec = new SecretKeySpec(buf, "AES");
		this.ivSpec = new IvParameterSpec(keyBytes);
	} catch (Exception e) {
		e.printStackTrace();
	}
}

public byte[] encrypt(byte[] origData) {
	try {
		Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
		cipher.init(Cipher.ENCRYPT_MODE, this.keySpec, this.ivSpec);
		return cipher.doFinal(origData);
	}  catch (Exception e) {
		e.printStackTrace();
	}
	return null;
}

public byte[] decrypt(byte[] crypted) {
	try {
		Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
		cipher.init(Cipher.DECRYPT_MODE, this.keySpec, this.ivSpec);
		return cipher.doFinal(crypted);
	}  catch (Exception e) {
		e.printStackTrace();
	}
	return null;
}

/**
 * [@param](https://my.oschina.net/u/2303379) args
 * [@throws](https://my.oschina.net/throws) Exception 
 */
public static void main(String[] args) throws Exception {
	AES aes = new AES("sfe023f_9fd&fwfl");
	String data = "polaris@studygolang";
	byte[] crypted = aes.encrypt(data.getBytes());
	System.out.println(base64Encode(crypted));
	System.out.println(new String(aes.decrypt(crypted)));
}

public static String base64Encode(byte[] data) {
	BASE64Encoder encoder = new BASE64Encoder();
	return encoder.encode(data);
}

}