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https://issues.apache.org/jira/browse/SSHD-567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14944934#comment-14944934
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Goldstein Lyor commented on SSHD-567:
-------------------------------------
Note: you might also have stumbled on some *internal JDK* hardwired limitation
regarding key size above 2048. If you _Google_ the exception message you can
find quite a few issues being reported with some hardwired sizes. See if you
are using the _Bouncycastle_ provider - if you don't, try using it and see if
the problem is recurring.
> Connection to Cisco caused java.security.InvalidAlgorithmParameterException
> ---------------------------------------------------------------------------
>
> Key: SSHD-567
> URL: https://issues.apache.org/jira/browse/SSHD-567
> Project: MINA SSHD
> Issue Type: Bug
> Affects Versions: 1.0.0
> Environment: Ubuntu 14.04, Oracle JVM 1.8.0_45, Cisco c2900, SSH v2
> Reporter: Max Vetrenko
>
> SshClient client = SshClient.setUpDefaultClient();
> final ClientSession session = client.connect(username, host,
> port).await().getSession();
> This code cause Exception:
> java.security.InvalidAlgorithmParameterException: Prime size must be multiple
> of 64, and can only range from 512 to 2048 (inclusive)
> at
> com.sun.crypto.provider.DHKeyPairGenerator.initialize(DHKeyPairGenerator.java:120)
> at
> java.security.KeyPairGenerator$Delegate.initialize(KeyPairGenerator.java:674)
> at java.security.KeyPairGenerator.initialize(KeyPairGenerator.java:411)
> at org.apache.sshd.common.kex.DHG.getE(DHG.java:66)
> at org.apache.sshd.client.kex.DHGEXClient.next(DHGEXClient.java:110)
> at
> org.apache.sshd.common.session.AbstractSession.doHandleMessage(AbstractSession.java:395)
> at
> org.apache.sshd.common.session.AbstractSession.handleMessage(AbstractSession.java:349)
> at
> org.apache.sshd.client.session.ClientSessionImpl.handleMessage(ClientSessionImpl.java:487)
> at
> org.apache.sshd.common.session.AbstractSession.decode(AbstractSession.java:848)
> at
> org.apache.sshd.common.session.AbstractSession.messageReceived(AbstractSession.java:331)
> at
> org.apache.sshd.common.session.AbstractSessionIoHandler.messageReceived(AbstractSessionIoHandler.java:57)
> at
> org.apache.sshd.common.io.nio2.Nio2Session$2.onCompleted(Nio2Session.java:220)
> at
> org.apache.sshd.common.io.nio2.Nio2Session$2.onCompleted(Nio2Session.java:212)
> at
> org.apache.sshd.common.io.nio2.Nio2CompletionHandler$1.run(Nio2CompletionHandler.java:34)
> at java.security.AccessController.doPrivileged(Native Method)
> at
> org.apache.sshd.common.io.nio2.Nio2CompletionHandler.completed(Nio2CompletionHandler.java:31)
> at sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:126)
> at sun.nio.ch.Invoker$2.run(Invoker.java:218)
> at
> sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:112)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> Application terminates after exception.
> OpenSSH server works fine
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