import java.io.*;
import java.security.*;
/**
?* <p>Title: 數字簽名工具類</p>
?* <p>Description: 使用非對稱密匙的私匙對輸入信息加密</p>
?* <p>Copyright: Copyright (c) 2003</p>
?* <p>Company: </p>
?* @author not galaxyp
?* @version 1.0
?*/
public class DSAUtil {
? public DSAUtil() {
? }
? /*
?? * 根據傳入的密匙文件路徑加密信息，并保存到指定的目錄下
?? * @param pOrgiInfo 要加密的信息
?? * @param pPrikeyPath 加密的私匙路徑和文件名
?? * @param pInfoPath 保存密文的路徑
?? */
? private void encryptInfo(String pOrgiInfo,String pPrikeyPath,String pInfoPath)throws Exception{
??? ObjectInputStream in=new ObjectInputStream(new FileInputStream(pPrikeyPath));
??? PrivateKey myprikey=(PrivateKey)in.readObject();
??? Signature signet=Signature.getInstance("DSA");
??? signet.initSign(myprikey);
??? signet.update(pOrgiInfo.getBytes());
??? byte[] signed=signet.sign();
??? ObjectOutputStream out=new ObjectOutputStream(new FileOutputStream(pInfoPath+"\\out.dat"));
??? out.writeObject(pOrgiInfo);
??? out.writeObject(signed);
??? out.close();
? }
? public static void main(String[] args) {
??? DSAUtil DSAUtil1 = new DSAUtil();
??? if(args == null || args.length != 3){
????? System.out.println("沒有輸入必要的信息");
????? System.out.println("\t參數一:要加密的信息");
????? System.out.println("\t參數二:私匙文件完整路徑和文件名");
????? System.out.println("\t參數三:保存密文的路徑，文件名為out.dat");
????? return;
??? }
??? String info = args[0];
??? String pPrikeyPath = args[1];
??? String pInfoPath = args[2];
??? try{
????? DSAUtil1.encryptInfo(info,pPrikeyPath,pInfoPath);
??? }catch(Exception e){
????? e.printStackTrace();
????? System.out.println("簽名失敗");
??? }
? }
}