package?JavaInteropSign;

import?java.io.*;
import?java.security.*;
import?java.security.spec.*;
import?javax.swing.JOptionPane;

/**
?*?@author?jeffrey?walton
?**/
public?class?Main?{

??static?String?ALGORITHM?=?“DSA“;
??
??public?static?void?main（String[]?args）?{
????try?{

??????CreateDSAKeys（）;

??????SignDSAMessage（）;
??????
??????VerifyDSAMessage（）;

????}?catch?（Exception?e）?{
??????System.err.println（“Main:?Exception?“?+?e.toString（））;
????}
??}

??private?static?void?VerifyDSAMessage（）?{

????try?{
??????
??????//?Load?the?public
??????PublicKey?publicKey?=?LoadPublicKey（“public.dsa.java.key“）;

??????//?Load?the?message?from?file
??????FileInputStream?mis?=?new?FileInputStream（“dsa.java.msg“）;
??????byte[]?message?=?new?byte[mis.available（）];
??????mis.read（message）;?mis.close（）;

??????//?Display?the?resurrected?string
??????JOptionPane.showMessageDialog（null
??????????new?String（message?0?message.length?“UTF-8“））;???????

??????//?Load?the?signature?of?the?message?from?file
??????FileInputStream?sis?=?new?FileInputStream（“dsa.java.sig“）;
??????byte[]?signature?=?new?byte[sis.available（）];
??????sis.read（signature）;?sis.close（）;

??????//?Initialize?Signature?object
??????Signature?verifier?=?Signature.getInstance（ALGORITHM）;
??????verifier.initVerify（publicKey）;

??????//?Load?the?message?into?the?Verifier?object
??????verifier.update（message）;

??????//?Verify?the?Signature?on?the?Message
??????boolean?result?=?verifier.verify（signature）;
??????
??????StringBuilder?sb?=?new?StringBuilder（）;
??????if（?result?）
??????{
????????sb.append（“Message?Verified:\n“）;
????????sb.append（new?String（message?0?message.length?“UTF-8“））;
??????}
??????else
??????{
????????sb.append（“Message?Not?Verified“）;
??????}
??????
??????JOptionPane.showMessageDialog（null?sb.toString（））;

????}?catch?（Exception?e）?{
??????System.err.println（“VerifyDSAMessage:?“?+?e.toString（））;
????}
??}
??
??private?static?void?SignDSAMessage（）?{

????try?{
??????//?Retrieve?the?Private?Key
??????PrivateKey?privateKey?=?LoadPrivateKey（“private.dsa.java.key“）;

??????//?Create?the?signer?object
??????Signature?signer?=?Signature.getInstance（ALGORITHM）;
??????signer.initSign（privateKey?new?SecureRandom（））;

??????//?Prepare?the?Message
??????String?s?=?“Crypto?Interop:?\u9aa8“;

??????//?Save?the?binary?of?the?String?which?we?will?sign
??????byte[]?message?=?s.getBytes（“UTF-8“）;

??????//?Insert?the?message?into?the?signer?object
??????signer.update（message）;
??????byte[]?signature?=?signer.sign（）;

??????//?mos:?message?filestream
??????//?sos:?signature?filestream
??????FileOutputStream?mos?=?new?FileOutputStream（“dsa.java.msg“）;
??????mos.write（message）;

??????FileOutputStream?sos?=?new?FileOutputStream（“dsa.java.sig“）;
??????sos.write（signature）;

????}?catch?（Exception?e）?{
??????System.err.println（“SignDSAMessage:?“?+?e.toString（））;
????}
??}

??private?static?PublicKey?LoadPublicKey（String?filename）?{

????PublicKey?key?=?null;

????try?{

??????FileInputStrea

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2008-04-25?23:17??JavaInteropSign\build\
?????目錄???????????0??2008-04-25?23:17??JavaInteropSign\build\classes\
?????目錄???????????0??2008-04-25?23:17??JavaInteropSign\build\classes\JavaInteropSign\
?????目錄???????????0??2008-04-25?23:17??JavaInteropSign\build\test\
?????目錄???????????0??2008-04-25?23:17??JavaInteropSign\build\test\classes\
?????目錄???????????0??2008-04-25?23:17??JavaInteropSign\build\test\results\
?????文件??????????85??2008-04-25?19:17??JavaInteropSign\manifest.mf
?????目錄???????????0??2008-04-25?23:17??JavaInteropSign\nbproject\
?????文件???????33178??2008-04-25?19:17??JavaInteropSign\nbproject\build-impl.xml
?????文件?????????455??2008-04-25?19:17??JavaInteropSign\nbproject\genfiles.properties
?????目錄???????????0??2008-04-25?23:17??JavaInteropSign\nbproject\private\
?????文件?????????188??2008-04-25?19:17??JavaInteropSign\nbproject\private\private.properties
?????文件????????1824??2008-04-25?19:17??JavaInteropSign\nbproject\project.properties
?????文件?????????585??2008-04-25?19:17??JavaInteropSign\nbproject\project.xml
?????目錄???????????0??2008-04-25?23:17??JavaInteropSign\src\
?????目錄???????????0??2008-04-25?23:17??JavaInteropSign\src\JavaInteropSign\
?????文件????????5070??2008-04-25?23:12??JavaInteropSign\src\JavaInteropSign\Main.java
?????目錄???????????0??2008-04-25?23:17??JavaInteropSign\test\
?????目錄???????????0??2008-04-26?10:48??JavaInteropSign\