[JSch-users] Re: DH KeyPairGenerator not available or java.security.NoSuchAlgorithmException

[Romulus L. <rom...@ho...>]

Hi,

From the messages posted I can see there are some problems with various 
configurations and algorithms. I’ve had the same – or similar – 
problems and there are my findings:

-	When you get an java.security.NoSuchAlgorithmException it means that your 
Java security provider (it is usually packed in sunjce_provider.jar archive) 
either can not be found or it does not implements the required alghorithm.
-	java looks by default in JAVA_HOME\jre\lib\security\java.security file for 
lines like these:
security.provider.1=sun.security.provider.Sun
security.provider.2=com.sun.rsajca.Provider

If you add your provider here it will be found by default and there will be 
no problems as long as you put the jar file in the classpath.

If you don’t add your provider in this file but put it in the classpath is 
still OK as long as you do a:

Security.addProvider(new IBMJCE());

Before using the algohritm.


-	if you use an IDE ( I am using WebSphere Studio Application Developer 
which is based on Eclipse thus I suppose this applies to Eclipse users too) 
you must point to the jar file that have the provider inside it.
-	As a side note I’ve had some problems with the default security provider 
from Sun (some encryption algorithm not found when using JCE 1.2.X) and 
I’ve switched to one security provider from IBM: IBMJCE  packed in 
ibmjceprovider.jar. Since then I’ve had no problems. I am sure that there 
are other packages out there for the encryption algorithms implementation.
-	Use the following piece of code to list what providers you are and what 
are they capable of:
Provider[] provider = Security.getProviders();
for (int x = 0; x < provider.length; x++) {
	System.out.println(provider[x].getName());
	System.out.println(
			"Provider information: " + provider[x].getInfo());
	System.out.println(
			"Provider version: " + provider[x].getVersion());
      Set entries = provider[x].entrySet();
	Iterator iterator = entries.iterator();
	while (iterator.hasNext()) {
	System.out.println("   Property entry: " + iterator.next());
	}
}

I hope this helps.

Romulus


>From: "Singhal, Ankit (Ankit)" <asi...@lu...>
>To: "'ym...@jc...'" <ym...@jc...>
>CC: "'jsc...@li...'" <jsc...@li...>
>Subject: [JSch-users] DH KeyPairGenerator not available
>Date: Mon, 30 Aug 2004 19:37:24 +0530
>
>Hi,
>
>I am running one of the Examples provided in JSCH in solaris server. I am
>using JDK 1.3 and JCE 1.2.1. While running the program ,I have updated my
>classpath with all the jars present in the JCE 1.2.1. /lib directory . When
>I run the program it gave me java.security.NoSuchAlgorithmException: DH
>KeyPairGenerator not available Exception.
>
>But when I copy all the jars from JCE 1.2.1. /lib to  JRE_1.3.1/lib/ext  
>the
>program runs fine .
>
>It means that it is mandatory for JSCH (copying all the security jars in
>JRE_1.3.1/lib/ext  ) while running it in JRE1.3 , if not then what is the
>work around.
>
>The same problem I am getting in Windows Enviornment also.
>
>TIA
>Ankit
>
>
>
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