import?java.io.*;
import?javax.crypto.*;
import?javax.crypto.spec.*;

public?class?CMAC?{
	private?static?final?String?fileName?=?“5070309654_徐京_實驗報告3.pdf“;
	private?static?int?BLOCK_LEN;
	private?Cipher?cipher;
	private?byte[]?key;
	private?byte[]?k1;
	private?byte[]?k2;
	
	public?static?void?main（String[]?args）?throws?Exception?{
		CMAC?cmac?=?new?CMAC（）;
		cmac.init（）;
		System.out.println（cmac.getMAC（new?FileInputStream（fileName）））;
	}
	
	private?void?init（）?throws?Exception?{
		BLOCK_LEN?=?16;
		key?=?getKey（“507030965420101114“.getBytes（））;
		cipher?=?Cipher.getInstance（“AES/CBC/noPadding“）;
		IvParameterSpec?iv?=?new?IvParameterSpec（key）;
		SecretKeySpec?sk?=?new?SecretKeySpec（key?0?BLOCK_LEN?“AES“）;
		cipher.init（Cipher.ENCRYPT_MODE?sk?iv）;
		byte[]?kl?=?cipher.update（new?byte[BLOCK_LEN]）;
		k1?=?getSubKey（kl）;
		k2?=?getSubKey（k1）;
	}
	
	/**
	?*?得到MAC
	?*?@param?cipher
	?*?@param?k1
	?*?@param?k2
	?*?@param?text
	?*?@return
	?*?@throws?Exception
	?*/
	private?String?getMAC（InputStream?text）?throws?Exception?{
		byte[]?cipherText?=?new?byte[BLOCK_LEN];
		byte[]?current?=?new?byte[BLOCK_LEN];
		byte[]?next?=?new?byte[BLOCK_LEN];
		int?currentLen?nextLen;
		currentLen?=?text.read（current）;
		do?{
			nextLen?=?text.read（next）;
			if?（nextLen?!=?-1）?{
				cipherText?=?cipher.update（xor（current?cipherText））;
				current?=?next;
				currentLen?=?nextLen;
				next?=?new?byte[BLOCK_LEN];
				nextLen?=?0;
			}
		}?while?（nextLen?!=?-1）;
		if?（currentLen?			cipherText?=?cipher.update（xor（xor（padding（current?currentLen）?k2）?cipherText））;
		else?