Re: [Jsdsi-users] KeyPair

[Sean R. <sra...@ae...>]

Marek Lány wrote:

>Hi Luis,
>
>Still does not work. It always write this error after read KeyPair from
>file:
>Exception in thread "main" java.lang.NullPointerException
>        at Certif1.main(Certif1.java:150)
>
>And line 150 is siple console command:
>      System.out.println( gk.getPublic().toString() );
>
>I have feeling that on read KeyPair from file Java can't read correctly
>after that is KeyPair structure empty.Have you another idea?
>
>  Marek Lany
>Basically to write out a certificate, 
>  
>
What is giving the NPE, the KeyPair or the public key of the KeyPair? I 
guess the latter?

What implementation of KeyPair / Private Key are you using? Does that 
support straight serialisation? I've noticed some odd things with the 
standard sun RSA keys - I have a case where the PrivateKey does not 
implement java.security.PrivateKey. Though I doubt something odd is 
happening and it probably is your code.

Can you give me a clean list of your source?

Sean
 

>-----Original Message-----
>From: Sean Radford [mailto:sra...@ae...] 
>Sent: Thursday, August 12, 2004 12:30 PM
>To: Luis Pedro
>Cc: mar...@or...; jsd...@li...
>Subject: Re: [Jsdsi-users] KeyPair
>
>
>Luis Pedro wrote:
>
>  
>
>>Marek,
>>
>>It help if u send the exact error. But try this:
>>	- If the error is "SPKI not found", then u have to load jsdsi 
>>provider, i.e, jsdsi.Provider.install() and cryptix provider.
>>
>>But, if your problem is a ClassCastException then u have an error on 
>>your code and u should change this(following your code):
>>
>>	java.security.KeyPair gk =
>>    
>>
>jsdsi.util.KeyPairFactory.create("RSA",
>  
>
>>2048);
>>	java.io.FileOutputStream fos = new 
>>java.io.FileOutputStream("gde/tests/test.pub");
>>	java.io.ObjectOutputStream oos = new
>>    
>>
>java.io.ObjectOutputStream(fos);
>  
>
>>// I have changed things here, tooked "toString()"	
>>	oos.writeObject(gk);
>>// Doesn't make sense writing an object like gk.toString()!!
>>// writeObject serializes the object. U can't cast from "String" to
>>"KeyPair" 
>>	oos.close();
>>
>>	java.security.KeyPair gk;
>>	java.io.FileInputStream fos = new 
>>java.io.FileInputStream("gde/tests/test.pub");
>>	java.io.ObjectInputStream oos = new
>>    
>>
>java.io.ObjectInputStream(fos);
>  
>
>>   	gk = (java.security.KeyPair)oos.readObject();
>>	oos.close();
>>	
>>            -- Luís Pedro
>>
>>
>>_____________________
>>yahoo: lpv_pt
>>  msn: lp...@ne...
>>
>>
>>
>>    
>>
>>>    -----Original Message-----
>>>    From: jsd...@li... 
>>>    [mailto:jsd...@li...] On 
>>>    Behalf Of Marek Lány
>>>    Sent: quarta-feira, 11 de Agosto de 2004 19:16
>>>    To: jsd...@li...
>>>    Subject: [Jsdsi-users] KeyPair
>>>    
>>>    Hi
>>>    
>>>    I will save and load a KeyPair, but i can't it. I trying 
>>>    with this:
>>>            KeyPair gk =
>>>      
>>>
>jsdsi.util.KeyPairFactory.create("RSA",2048);
>  
>
>>>            FileOutputStream fos = new FileOutputStream("gk.pub");
>>>            ObjectOutputStream oos = new ObjectOutputStream(fos);
>>>            oos.writeObject(gk.toString());
>>>            oos.close();
>>>    
>>>    How can't I load this object and retype in a KeyPair? 
>>>    This code don't
>>>    work:
>>>    
>>>            KeyPair gk;
>>>            FileInputStream fos = new FileInputStream("gk.pub");
>>>            ObjectInputStream oos = new ObjectInputStream(fos);
>>>            gk = (KeyPair) oos.readObject();
>>>            oos.close();
>>>    
>>>    Thanx.
>>>    
>>>                   Marek Lany
>>>    
>>>    
>>>    
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>>
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>> 
>>
>>    
>>
>Marek, did Luis help you out?
>
>An alternative is to use jsdsi.sexp.ObjOutputStream and 
>jsdsi.sexp.ObjInputStream instead of the java.io.ObjectXxxStream classes
>
>though both approaches should work (with Luis's suggestions).
>
>Sean
>
>  
>


-- 
Dr. Sean Radford, MBBS, MSc
sra...@ae...
http://www.aegeus-technology.com/