java - how to read private key for digital signature -


i building application signing files digitally, done tow parts signing , verification, want build method read private key, , sign file. because not want use different key every time when signing something.

    // here method reading private key class pk implements serializable{     privatekey pk = null;      public pk(string nazivfajla) throws filenotfoundexception, ioexception {         this.pk = privatni;         fileoutputstream fos = new fileoutputstream(nazivfajla);         objectoutputstream oos = new objectoutputstream(fos);         oos.writeobject(this.pk);         oos.close();         fos.close();     }      public privatekey getpk(string nazivfajla) throws filenotfoundexception, ioexception, classnotfoundexception {          fileinputstream fis = new fileinputstream(nazivfajla);         objectinputstream ois = new objectinputstream(fis);         this.pk = (privatekey) ois.readobject();         return pk;     }

and here method in button field:

    private void ucitajprivatniactionperformed(java.awt.event.actionevent evt) {                                                try {         jfc.showopendialog(jfc);         string fajlzaprivatnikljuc = jfc.getselectedfile().getabsolutepath();         pk pk = new pk(fajlzaprivatnikljuc);         privatni = pk.getpk(fajlzaprivatnikljuc);         this.tick_uf2.setvisible(true);     } catch (ioexception | classnotfoundexception ex) {         logger.getlogger(gui.class.getname()).log(level.severe, null, ex);     }     }

this signing method:

    private void potpisi1actionperformed(java.awt.event.actionevent evt) {                                              try {         //alisa bira algoritme - izabrala je rsa sa sha-1          signature dsa = signature.getinstance("sha1withrsa");          try{         dsa.initsign(privatni);         }catch(exception e){             system.out.println("crashed here!");          }              fileinputstream poruka = new fileinputstream(fajlzapotpis);         bufferedinputstream bufporuka = new bufferedinputstream(poruka);         byte[] buffer = new byte[1024];         int len;         while (bufporuka.available() != 0) {             len = bufporuka.read(buffer);             dsa.update(buffer, 0, len);         }         bufporuka.close();         poruka.close();         //alisa generiše digitalni potpis pozivajući metod sign()         byte[] digitalnipotpis = dsa.sign();         jfc.showsavedialog(jfc);         sacuvaj(digitalnipotpis, jfc.getselectedfile().getabsolutepath());         this.tick_uf3.setvisible(true);      } catch (nosuchalgorithmexception ex) {         logger.getlogger(gui.class.getname()).log(level.severe, null, ex);     } catch (filenotfoundexception ex) {         logger.getlogger(gui.class.getname()).log(level.severe, null, ex);     } catch (ioexception ex) {         logger.getlogger(gui.class.getname()).log(level.severe, null, ex);     } catch (signatureexception ex) {         logger.getlogger(gui.class.getname()).log(level.severe, null, ex);     }

and here mistake after trying sign:

мај 14, 2015 8:09:55 pm dp.gui potpisi1actionperformed severe: null java.security.signatureexception: object not initialized signature or verification     @ java.security.signature.update(signature.java:738)     @ dp.gui.potpisi1actionperformed(gui.java:553)     @ dp.gui.access$1500(gui.java:46)     @ dp.gui$16.actionperformed(gui.java:306)     @ javax.swing.abstractbutton.fireactionperformed(abstractbutton.java:2022)     @ javax.swing.abstractbutton$handler.actionperformed(abstractbutton.java:2346)     @ javax.swing.defaultbuttonmodel.fireactionperformed(defaultbuttonmodel.java:402)     @ javax.swing.defaultbuttonmodel.setpressed(defaultbuttonmodel.java:259)     @ javax.swing.plaf.basic.basicbuttonlistener.mousereleased(basicbuttonlistener.java:252)     @ java.awt.component.processmouseevent(component.java:6525)     @ javax.swing.jcomponent.processmouseevent(jcomponent.java:3321)     @ java.awt.component.processevent(component.java:6290)     @ java.awt.container.processevent(container.java:2234)     @ java.awt.component.dispatcheventimpl(component.java:4881)     @ java.awt.container.dispatcheventimpl(container.java:2292)     @ java.awt.component.dispatchevent(component.java:4703)     @ java.awt.lightweightdispatcher.retargetmouseevent(container.java:4898)     @ java.awt.lightweightdispatcher.processmouseevent(container.java:4533)     @ java.awt.lightweightdispatcher.dispatchevent(container.java:4462)     @ java.awt.container.dispatcheventimpl(container.java:2278)     @ java.awt.window.dispatcheventimpl(window.java:2739)     @ java.awt.component.dispatchevent(component.java:4703)     @ java.awt.eventqueue.dispatcheventimpl(eventqueue.java:746)     @ java.awt.eventqueue.access$400(eventqueue.java:97)     @ java.awt.eventqueue$3.run(eventqueue.java:697)     @ java.awt.eventqueue$3.run(eventqueue.java:691)     @ java.security.accesscontroller.doprivileged(native method)     @ java.security.protectiondomain$1.dointersectionprivilege(protectiondomain.java:75)     @ java.security.protectiondomain$1.dointersectionprivilege(protectiondomain.java:86)     @ java.awt.eventqueue$4.run(eventqueue.java:719)     @ java.awt.eventqueue$4.run(eventqueue.java:717)     @ java.security.accesscontroller.doprivileged(native method)     @ java.security.protectiondomain$1.dointersectionprivilege(protectiondomain.java:75)     @ java.awt.eventqueue.dispatchevent(eventqueue.java:716)     @ java.awt.eventdispatchthread.pumponeeventforfilters(eventdispatchthread.java:201)     @ java.awt.eventdispatchthread.pumpeventsforfilter(eventdispatchthread.java:116)     @ java.awt.eventdispatchthread.pumpeventsforhierarchy(eventdispatchthread.java:105)     @ java.awt.eventdispatchthread.pumpevents(eventdispatchthread.java:101)     @ java.awt.eventdispatchthread.pumpevents(eventdispatchthread.java:93)     @ java.awt.eventdispatchthread.run(eventdispatchthread.java:82)

please if know answer please me, junior programmer, , need this.. in advance!

private keys should not encoded using object serialization. private keys can encoded using getencoded() method , read in using pkcs8encodedkeyspec supplied "rsa" keyfactory instance.


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