[JSch-users] Problems with KeyPairGenerator.getInstance("DH")

[Jeff B. <JBa...@sa...>]

Howdy,

I'm using a software package from Jakarta-Commons called VFS =
(http://jakarta.apache.org/commons/sandbox/vfs/index.html).  This =
package uses JSch.  Unfortunately the unit tests that exercise the JSch =
dependent code are failing on JSch calls, and I can't figure out why.

I'm using jdk1.3.  I've tried jsch 0.1.2 (specified for vfs) and 0.1.5 =
(the most current) with no different behavior.  I also tried using =
straight jce 1.2.2 from Sun and jce from bouncycastle =
(http://www.bouncycastle.org) v119.

I've tried manually connecting to two different linux servers both =
running ssh2 is installed on both machines and I'm able to do a =
commandline connection using sftp, so I know that works.

The problem starts with a call to Session.connect().  Everything seems =
peachy until line 52 in com.jcraft.jsch.jce.DH which looks like so:

myKpairGen=3DKeyPairGenerator.getInstance("DH");

This is apparently a java.security.KeyPairGenerator.  This barfs with =
this message: "DH KeyPairGenerator not available". =20

This exception then leads to other down stream issues resulting in a =
NPE:

java.lang.NullPointerException
	at com.jcraft.jsch.jce.DH.getE(DH.java:58)
	at com.jcraft.jsch.jce.DHG1.init(DHG1.java:114)
	at com.jcraft.jsch.Session.receive_kexinit(Session.java:379)
	at com.jcraft.jsch.Session.connect(Session.java:246)
	at =
org.apache.commons.vfs.provider.sftp.SftpFileSystem.getChannel(SftpFileSy=
stem.java:108)
	at =
org.apache.commons.vfs.provider.sftp.SftpFileObject.statSelf(SftpFileObje=
ct.java:138)
	at =
org.apache.commons.vfs.provider.sftp.SftpFileObject.doGetType(SftpFileObj=
ect.java:106)
	at =
org.apache.commons.vfs.provider.AbstractFileObject.attach(AbstractFileObj=
ect.java:919)
	at =
org.apache.commons.vfs.provider.AbstractFileObject.exists(AbstractFileObj=
ect.java:372)
	at =
org.apache.commons.vfs.test.ProviderTestSuite.setUp(ProviderTestSuite.jav=
a:198)
	at junit.extensions.TestSetup$1.protect(TestSetup.java:18)
	at junit.framework.TestResult.runProtected(TestResult.java:124)
	at junit.extensions.TestSetup.run(TestSetup.java:23)
	at =
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTes=
tRunner.java:392)
	at =
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunn=
er.java:276)
	at =
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRun=
ner.java:167)

Has anyone come across this?  I peeked at the =
KeyPairGenerator.getInstance() docs, and it looks like DH isn't a valid =
option.  This doesn't seem to be an issue for lots of other people =
though, a google search reveals lots of code on the net with the line: =
KeyPairGenerator.getInstance("DH").

thanks,
+jeff

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=20