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KeyExchangeFactories not set [message #1860762]

Fri, 01 September 2023 10:40

Eclipse User

Hi, i'm very new to jgit. I'm trying to setup an

SshdSessionFactory

.
The fun part is that i am on Android.

Here is how I build my

SshdSessionFactory

fun build(): SshdSessionFactory {

        val sshdSessionFactory = SshdSessionFactoryBuilder()
            .setPreferredAuthentications("publickey")
            .setHomeDirectory(homeDir)
            .setSshDirectory(sshDir)
            //.setDefaultIdentities { listOf(Paths.get(privateKey.path)) }
            .build(null)


        SshSessionFactory.setInstance(sshdSessionFactory);
        return sshdSessionFactory
    }

And here is the message error i get when i trying to clone a repo:

Caused by: java.lang.IllegalArgumentException: KeyExchangeFactories not set
2023-09-01 15:57:21.596  5105-5105  System.err              com.example.gitnote                  W  	at org.apache.sshd.common.util.ValidateUtils.$r8$lambda$1D3Pm1dHguhozQI_dpJQD8NBElg(Unknown Source:2)
2023-09-01 15:57:21.596  5105-5105  System.err              com.example.gitnote                  W  	at org.apache.sshd.common.util.ValidateUtils$$ExternalSyntheticLambda1.apply(Unknown Source:2)
2023-09-01 15:57:21.596  5105-5105  System.err              com.example.gitnote                  W  	at org.apache.sshd.common.util.ValidateUtils.createFormattedException(ValidateUtils.java:213)
2023-09-01 15:57:21.596  5105-5105  System.err              com.example.gitnote                  W  	at org.apache.sshd.common.util.ValidateUtils.throwIllegalArgumentException(ValidateUtils.java:179)
2023-09-01 15:57:21.596  5105-5105  System.err              com.example.gitnote                  W  	at org.apache.sshd.common.util.ValidateUtils.checkTrue(ValidateUtils.java:174)
2023-09-01 15:57:21.596  5105-5105  System.err              com.example.gitnote                  W  	at org.apache.sshd.common.util.ValidateUtils.checkNotNullAndNotEmpty(ValidateUtils.java:80)
2023-09-01 15:57:21.596  5105-5105  System.err              com.example.gitnote                  W  	at org.apache.sshd.common.helpers.AbstractFactoryManager.checkConfig(AbstractFactoryManager.java:513)
2023-09-01 15:57:21.596  5105-5105  System.err              com.example.gitnote                  W  	at org.apache.sshd.client.SshClient.checkConfig(SshClient.java:396)
2023-09-01 15:57:21.596  5105-5105  System.err              com.example.gitnote                  W  	at org.apache.sshd.client.SshClient.start(SshClient.java:455)
2023-09-01 15:57:21.596  5105-5105  System.err              com.example.gitnote                  W  	at org.eclipse.jgit.transport.sshd.SshdSession.connect(SshdSession.java:98)
2023-09-01 15:57:21.596  5105-5105  System.err              com.example.gitnote                  W  	at org.eclipse.jgit.transport.sshd.SshdSessionFactory.getSession(SshdSessionFactory.java:256)
2023-09-01 15:57:21.596  5105-5105  System.err              com.example.gitnote                  W  	... 80 more

I guess this is because i don't have an agent/client setup since i'm on Android. So how can i get rid on this error ?

Re: KeyExchangeFactories not set [message #1860790 is a reply to message #1860762]

Sun, 03 September 2023 13:09

Eclipse User

Unclear. I do not have Android available to test, so I cannot really help. Possible causes:

No SecurityProvider is installed.
No SecurityProvider supporting generating keypairs for the DH algorithm is installed.
Something goes wrong in Apache MINA sshd on Android with figuring out the maximum and minimum key sizes supported for the DH algorithm. (Apache MINA sshd by default checks for a key size of 8192 bits initially -- I've seen mentions that Android had a maximum of only 4096.)

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