[Cyberduck-trac] [Cyberduck] #10412: Unable to login with ECDSA key

[Cyberduck]

#10412: Unable to login with ECDSA key
--------------------------------+-------------------------
    Reporter:  elliott balsley  |      Owner:
        Type:  defect           |     Status:  new
    Priority:  normal           |  Milestone:
   Component:  sftp             |    Version:  6.6.2
    Severity:  normal           |   Keywords:
Architecture:  Intel            |   Platform:  macOS 10.13
--------------------------------+-------------------------
 I'm unable to login to my SFTP server using an ECDSA public key.  This key
 is 521 bits and password-protected.  This used to work fine with an RSA
 key before I switched.  The first time I connect, it says "Broken
 transport; encountered EOF. The connection attempt was rejected. The
 server may be down, or your network may not be properly configured.".
 When I try again, it says "Exhausted available authentication methods."
 I've tried in the latest 6.6.2 and this is what I get from the log:

 {{{
 Jul 29 18:40:31 fifteen Cyberduck[24028]: [reader] ERROR
 net.schmizz.sshj.transport.TransportImpl - Dying because - Broken
 transport; encountered EOF

         net.schmizz.sshj.transport.TransportException: Broken transport;
 encountered EOF
                 at net.schmizz.sshj.transport.Reader.run(Reader.java:57)
 Jul 29 18:40:31 fifteen Cyberduck[24028]: [background-9] ERROR
 net.schmizz.concurrent.Promise - <<authenticated>> woke to:
 net.schmizz.sshj.userauth.UserAuthException: Broken transport; encountered
 EOF
 Jul 29 18:40:49 fifteen Cyberduck[24028]: [reader] ERROR
 net.schmizz.sshj.transport.TransportImpl - Dying because - null

         java.lang.ArrayIndexOutOfBoundsException
                 at java.lang.System.arraycopy(Native Method)
                 at
 net.schmizz.sshj.signature.SignatureECDSA.encode(SignatureECDSA.java:96)
                 at
 net.schmizz.sshj.userauth.method.KeyedAuthMethod.putSig(KeyedAuthMethod.java:74)
                 at
 net.schmizz.sshj.userauth.method.AuthPublickey.sendSignedReq(AuthPublickey.java:74)
                 at
 net.schmizz.sshj.userauth.method.AuthPublickey.handle(AuthPublickey.java:45)
                 at
 net.schmizz.sshj.userauth.UserAuthImpl.handle(UserAuthImpl.java:142)
                 at
 net.schmizz.sshj.transport.TransportImpl.handle(TransportImpl.java:500)
                 at
 net.schmizz.sshj.transport.Decoder.decode(Decoder.java:102)
                 at
 net.schmizz.sshj.transport.Decoder.received(Decoder.java:170)
                 at net.schmizz.sshj.transport.Reader.run(Reader.java:59)
 Jul 29 18:40:49 fifteen Cyberduck[24028]: [background-10] ERROR
 net.schmizz.concurrent.Promise - <<authenticated>> woke to:
 net.schmizz.sshj.userauth.UserAuthException

 }}}

 And this is what shows in the sshd server log:
 {{{
 Jul 29 18:46:39 kodi sshd[4422]: error: buffer_get_bignum2_ret: negative
 numbers not supported
 Jul 29 18:46:39 kodi sshd[4422]: fatal: buffer_get_bignum2: buffer error
 Jul 29 18:46:41 kodi sshd[4424]: Connection closed by 192.168.3.101
 [preauth]
 Jul 29 18:46:49 kodi sshd[4429]: Received disconnect from 192.168.3.101:
 11:  [preauth]
 }}}

--
Ticket URL: <https://trac.cyberduck.io/ticket/10412>
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