Bad packet length after SSH_MSG_KEXINIT

Hi all,

I'm getting the following when upgrading sshj from 0.18 to 0.31.

a) 0.31 - bad packet length:
```
2021-03-09 19:49:21,322 [pool-InterpreterHandler_TELNET-thread-4] INFO telnetproxy.SshClientConfig - Getting algorithm for seeding
2021-03-09 19:49:21,322 [pool-InterpreterHandler_TELNET-thread-4] INFO telnetproxy.SshClientConfig - Generating seed
2021-03-09 19:49:21,323 [pool-InterpreterHandler_TELNET-thread-4] INFO telnetproxy.SshClientConfig - Seed generated
2021-03-09 19:49:21,344 [pool-InterpreterHandler_TELNET-thread-4] DEBUG sshj.DefaultConfig - Available cipher factories: [aes128-cbc, aes128-ctr, aes192-cbc, aes192-ctr, aes256-cbc, aes256-ctr, aes128-gcm@openssh.com, aes256-gcm@openssh.com, blowfish
-cbc, blowfish-ctr, cast128-cbc, cast128-ctr, idea-cbc, idea-ctr, serpent128-cbc, serpent128-ctr, serpent192-cbc, serpent192-ctr, serpent256-cbc, serpent256-ctr, 3des-cbc, 3des-ctr, twofish128-cbc, twofish128-ctr, twofish192-cbc, twofish192-ctr, twofi
sh256-cbc, twofish256-ctr, twofish-cbc, arcfour, arcfour128, arcfour256]
2021-03-09 19:49:21,355 [pool-InterpreterHandler_TELNET-thread-4] INFO transport.TransportImpl - Client identity string: SSH-2.0-SSHJ_0.31.0
2021-03-09 19:49:21,377 [pool-InterpreterHandler_TELNET-thread-4] INFO transport.TransportImpl - Server identity string: SSH-2.0-RomSShell_4.31
2021-03-09 19:49:21,378 [pool-InterpreterHandler_TELNET-thread-4] DEBUG transport.KeyExchanger - Sending SSH_MSG_KEXINIT
2021-03-09 19:49:21,381 [reader] TRACE transport.Decoder - Received packet #0: 14 f0 61 57 c8 c2 86 ce 6e e9 67 e7 f0 36 95 3a e7 00 00 00 1a 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 2d 73 68 61 31 00 00 00 07 73 73 68 2d 64 73
73 00 00 00 08 33 64 65 73 2d 63 62 63 00 00 00 08 33 64 65 73 2d 63 62 63 00 00 00 09 68 6d 61 63 2d 73 68 61 31 00 00 00 09 68 6d 61 63 2d 73 68 61 31 00 00 00 04 6e 6f 6e 65 00 00 00 04 6e 6f 6e 65 00 00 00 00 00 00 00 00 00 00 00 00 00
2021-03-09 19:49:21,383 [reader] TRACE transport.TransportImpl - Received packet KEXINIT
2021-03-09 19:49:21,383 [reader] DEBUG transport.KeyExchanger - Received SSH_MSG_KEXINIT
2021-03-09 19:49:21,384 [pool-InterpreterHandler_TELNET-thread-4] TRACE transport.Encoder - Encoding packet #0: 14 cc 91 04 3d 4c 04 5d 0d 40 45 29 b1 04 67 28 5b 00 00 02 a7 63 75 72 76 65 32 35 35 31 39 2d 73 68 61 32 35 36 2c 63 75 72 76 65 32 35
35 31 39 2d 73 68 61 32 35 36 40 6c 69 62 73 73 68 2e 6f 72 67 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 2d 65 78 63 68 61 6e 67 65 2d 73 68 61 32 35 36 2c 65 63 64 68 2d 73 68 61 32 2d 6e 69 73 74 70 35 32 31 2c 65 63 64 68 2d 73
68 61 32 2d 6e 69 73 74 70 33 38 34 2c 65 63 64 68 2d 73 68 61 32 2d 6e 69 73 74 70 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 2d 65 78 63 68 61 6e 67 65 2d 73 68 61 31 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 7
2 6f 75 70 31 2d 73 68 61 31 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 34 2d 73 68 61 31 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 34 2d 73 68 61 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d
67 72 6f 75 70 31 35 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 37 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65
6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 38 2d 73 68 61 35 31 32 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 34 2d 73 68 61 32 35 36 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 35 2d 73 6
8 61 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 35 2d 73 68 61 32 35 36 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 35 2d 73 68 61 33 38 34 40 73 73 68 2e 63 6f 6d 2c 64 69
66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 36 2d 73 68 61 33 38 34 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f
75 70 31 36 2d 73 68 61 35 31 32 40 73 73 68 2e 63 6f 6d 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 38 2d 73 68 61 35 31 32 40 73 73 68 2e 63 6f 6d 2c 65 78 74 2d 69 6e 66 6f 2d 63 00 00 00 ab 73 73 68 2d 65 64 32 35 35 31 39 2
c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 35 32 31 2c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 33 38 34 2c 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 32 35 36 2c 72 73 61 2d 73 68 61 32 2d 35 31 32 2c 72 73 61 2d 73 68 61 32 2d 32
35 36 2c 73 73 68 2d 72 73 61 2d 63 65 72 74 2d 76 30 31 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 73 73 68 2d 64 73 73 2d 63 65 72 74 2d 76 30 31 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 73 73 68 2d 72 73 61 2c 73 73 68 2d 64 73 73 00 00 01 a3 61 65 73 31
32 38 2d 63 62 63 2c 61 65 73 31 32 38 2d 63 74 72 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 65 73 31 39 32 2d 63 74 72 2c 61 65 73 32 35 36 2d 63 62 63 2c 61 65 73 32 35 36 2d 63 74 72 2c 61 65 73 31 32 38 2d 67 63 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6
d 2c 61 65 73 32 35 36 2d 67 63 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 62 6c 6f 77 66 69 73 68 2d 63 62 63 2c 62 6c 6f 77 66 69 73 68 2d 63 74 72 2c 63 61 73 74 31 32 38 2d 63 62 63 2c 63 61 73 74 31 32 38 2d 63 74 72 2c 69 64 65 61 2d 63 62 63 2c
69 64 65 61 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 74 72 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 62 63 2c
73 65 72 70 65 6e 74 32 35 36 2d 63 74 72 2c 33 64 65 73 2d 63 62 63 2c 33 64 65 73 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 62 63 2c 74 77 6f 66 69 7
3 68 31 39 32 2d 63 74 72 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 62 63 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 74 72 2c 74 77 6f 66 69 73 68 2d 63 62 63 2c 61 72 63 66 6f 75 72 2c 61 72 63 66 6f 75 72 31 32 38 2c 61 72 63 66 6f 75 72 32 35 36 00 00 01
a3 61 65 73 31 32 38 2d 63 62 63 2c 61 65 73 31 32 38 2d 63 74 72 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 65 73 31 39 32 2d 63 74 72 2c 61 65 73 32 35 36 2d 63 62 63 2c 61 65 73 32 35 36 2d 63 74 72 2c 61 65 73 31 32 38 2d 67 63 6d 40 6f 70 65 6e 73 73
68 2e 63 6f 6d 2c 61 65 73 32 35 36 2d 67 63 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 62 6c 6f 77 66 69 73 68 2d 63 62 63 2c 62 6c 6f 77 66 69 73 68 2d 63 74 72 2c 63 61 73 74 31 32 38 2d 63 62 63 2c 63 61 73 74 31 32 38 2d 63 74 72 2c 69 64 65 61 2
d 63 62 63 2c 69 64 65 61 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 74 72 2c 73 65 72 70 65 6e 74 32 35 36
2d 63 62 63 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 74 72 2c 33 64 65 73 2d 63 62 63 2c 33 64 65 73 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 62 63 2c 74
77 6f 66 69 73 68 31 39 32 2d 63 74 72 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 62 63 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 74 72 2c 74 77 6f 66 69 73 68 2d 63 62 63 2c 61 72 63 66 6f 75 72 2c 61 72 63 66 6f 75 72 31 32 38 2c 61 72 63 66 6f 75 72 32 3
5 36 00 00 01 46 68 6d 61 63 2d 73 68 61 31 2c 68 6d 61 63 2d 73 68 61 31 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63
2d 6d 64 35 2c 68 6d 61 63 2d 6d 64 35 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2c
68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6
d 64 31 36 30 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 39 36 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 00 00 01
46 68 6d 61 63 2d 73 68 61 31 2c 68 6d 61 63 2d 73 68 61 31 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2c
68 6d 61 63 2d 6d 64 35 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2c 68 6d 61 63 2
d 73 68 61 32 2d 32 35 36 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30
2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 65 74 6d 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 2d 39 36 2c 68 6d 61 63 2d 72 69 70 65 6d 64 31 36 30 40 6f 70 65 6e 73 73 68 2e 63 6f 6d 00 00 00 04 6e 6f 6e 65
00 00 00 04 6e 6f 6e 65 00 00 00 00 00 00 00 00 00 00 00 00 00
2021-03-09 19:49:21,385 [reader] DEBUG transport.KeyExchanger - Negotiated algorithms: [ kex=diffie-hellman-group1-sha1; sig=ssh-dss; c2sCipher=3des-cbc; s2cCipher=3des-cbc; c2sMAC=hmac-sha1; s2cMAC=hmac-sha1; c2sComp=none; s2cComp=none; rsaSHA2Support=false ]
2021-03-09 19:49:21,397 [reader] TRACE transport.Encoder - Encoding packet #1: 1e 00 00 00 80 3f 56 6c 38 36 60 d2 99 eb 0d b5 42 d8 60 f2 e4 ec a2 85 c8 23 a8 71 f5 27 4f b7 55 11 93 cc 6a 12 2b 86 b7 d1 f3 85 e8 55 ed 53 0e 40 7d 73 cf 49 e1 9f 97
f0 b9 37 98 2f e8 04 84 7e a4 f9 25 96 7e 0d 5b e3 e8 a5 fb d4 2f 1a de f7 c7 00 18 9d bd f9 62 d1 d5 41 c6 4b bc 08 3a 54 38 39 b3 0c c4 51 df 9d 93 da 76 f1 0d b9 90 ba 83 b3 0a af 08 1f ea e4 be 37 1e 6f 4e 22 d3 86 d3 6c d4
2021-03-09 19:49:21,398 [reader] TRACE transport.Decoder - Received packet #1: 01 00 00 00 02 00 00 00 11 42 61 64 20 70 61 63 6b 65 74 20 6c 65 6e 67 74 68 00 00 00 00
2021-03-09 19:49:21,398 [reader] TRACE transport.TransportImpl - Received packet DISCONNECT
2021-03-09 19:49:21,398 [reader] INFO transport.TransportImpl - Received SSH_MSG_DISCONNECT (reason=PROTOCOL_ERROR, msg=Bad packet length)
2021-03-09 19:49:21,398 [reader] ERROR transport.TransportImpl - Dying because - Bad packet length
net.schmizz.sshj.transport.TransportException: [PROTOCOL_ERROR] Bad packet length
at net.schmizz.sshj.transport.TransportImpl.gotDisconnect(TransportImpl.java:565)
at net.schmizz.sshj.transport.TransportImpl.handle(TransportImpl.java:521)
at net.schmizz.sshj.transport.Decoder.decode(Decoder.java:113)
at net.schmizz.sshj.transport.Decoder.received(Decoder.java:203)
at net.schmizz.sshj.transport.Reader.run(Reader.java:60)
2021-03-09 19:49:21,399 [reader] INFO transport.TransportImpl - Disconnected - PROTOCOL_ERROR
2021-03-09 19:49:21,399 [reader] DEBUG transport.KeyExchanger - Got notified of net.schmizz.sshj.transport.TransportException: [PROTOCOL_ERROR] Bad packet length
2021-03-09 19:49:21,399 [reader] DEBUG transport.TransportImpl$NullService - Notified of net.schmizz.sshj.transport.TransportException: [PROTOCOL_ERROR] Bad packet length
```

b) In 0.18 everything works fine:
```
2021-03-09 20:39:34,636 [pool-InterpreterHandler_TELNET-thread-1] INFO telnetproxy.SshClientConfig - Getting algorithm for seeding
2021-03-09 20:39:34,636 [pool-InterpreterHandler_TELNET-thread-1] INFO telnetproxy.SshClientConfig - Generating seed
2021-03-09 20:39:34,636 [pool-InterpreterHandler_TELNET-thread-1] INFO telnetproxy.SshClientConfig - Seed generated
2021-03-09 20:39:34,684 [pool-InterpreterHandler_TELNET-thread-1] DEBUG sshj.DefaultConfig - Available cipher factories: [net.schmizz.sshj.transport.cipher.AES128CTR$Factory@b5191e2, net.schmizz.sshj.transport.cipher.AES192CTR$Factory@1edffbed, net.schmizz.sshj.transport.cipher.AES256CTR$Factory@70f66466, net.schmizz.sshj.transport.cipher.AES128CBC$Factory@5744cb7, net.schmizz.sshj.transport.cipher.AES192CBC$Factory@2ad037a, net.schmizz.sshj.transport.cipher.AES256CBC$Factory@634c8051, net.schmizz.sshj.transport.cipher.TripleDESCBC$Factory@205a0d0a, net.schmizz.sshj.transport.cipher.BlowfishCBC$Factory@76cfc42, blowfish-ctr, cast128-cbc, cast128-ctr, idea-cbc, idea-ctr, serpent128-cbc, serpent128-ctr, serpent192-cbc, serpent192-ctr, serpent256-cbc, serpent256-ctr, 3des-ctr, twofish128-cbc, twofish128-ctr, twofish192-cbc, twofish192-ctr, twofish256-cbc, twofish256-ctr, twofish-cbc, arcfour, arcfour128, arcfour256]
2021-03-09 20:39:34,700 [pool-InterpreterHandler_TELNET-thread-1] INFO telnetproxy.SshCommandProcessor - Connecting to 'Address = 10.238.94.252:22'
2021-03-09 20:42:45,734 [pool-InterpreterHandler_TELNET-thread-1] INFO transport.TransportImpl - Client identity string: SSH-2.0-SSHJ_0_17_2
2021-03-09 20:42:45,763 [pool-InterpreterHandler_TELNET-thread-1] INFO transport.TransportImpl - Server identity string: SSH-2.0-RomSShell_4.31
2021-03-09 20:42:45,764 [pool-InterpreterHandler_TELNET-thread-1] DEBUG transport.KeyExchanger - Sending SSH_MSG_KEXINIT
2021-03-09 20:42:45,765 [reader] TRACE transport.Decoder - Received packet #0: 14 34 9a 33 9d 99 09 94 05 3c 61 db 49 a1 0e c5 32 00 00 00 1a 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 2d 73 68 61 31 00 00 00 07 73 73 68 2d 64 73
73 00 00 00 08 33 64 65 73 2d 63 62 63 00 00 00 08 33 64 65 73 2d 63 62 63 00 00 00 09 68 6d 61 63 2d 73 68 61 31 00 00 00 09 68 6d 61 63 2d 73 68 61 31 00 00 00 04 6e 6f 6e 65 00 00 00 04 6e 6f 6e 65 00 00 00 00 00 00 00 00 00 00 00 00 00
2021-03-09 20:42:45,768 [reader] TRACE transport.TransportImpl - Received packet KEXINIT
2021-03-09 20:42:45,768 [reader] DEBUG transport.KeyExchanger - Received SSH_MSG_KEXINIT
2021-03-09 20:42:45,770 [pool-InterpreterHandler_TELNET-thread-1] TRACE transport.Encoder - Encoding packet #-1: 14 13 fc e5 3e c8 e4 db a8 f9 63 e3 f6 c0 fc 55 cb 00 00 00 d4 63 75 72 76 65 32 35 35 31 39 2d 73 68 61 32 35 36 40 6c 69 62 73 73 68 2e
6f 72 67 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 2d 65 78 63 68 61 6e 67 65 2d 73 68 61 32 35 36 2c 65 63 64 68 2d 73 68 61 32 2d 6e 69 73 74 70 35 32 31 2c 65 63 64 68 2d 73 68 61 32 2d 6e 69 73 74 70 33 38 34 2c 65 63 64 68 2
d 73 68 61 32 2d 6e 69 73 74 70 32 35 36 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 2d 65 78 63 68 61 6e 67 65 2d 73 68 61 31 2c 64 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 34 2d 73 68 61 31 2c 64 69 66 66 69 65
2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 31 2d 73 68 61 31 00 00 00 2f 65 63 64 73 61 2d 73 68 61 32 2d 6e 69 73 74 70 32 35 36 2c 73 73 68 2d 72 73 61 2c 73 73 68 2d 64 73 73 2c 73 73 68 2d 65 64 32 35 35 31 39 00 00 01 75 61 65 73 31 32 38 2d 63 74
72 2c 61 65 73 31 39 32 2d 63 74 72 2c 61 65 73 32 35 36 2d 63 74 72 2c 61 65 73 31 32 38 2d 63 62 63 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 65 73 32 35 36 2d 63 62 63 2c 33 64 65 73 2d 63 62 63 2c 62 6c 6f 77 66 69 73 68 2d 63 62 63 2c 62 6c 6f 77 6
6 69 73 68 2d 63 74 72 2c 63 61 73 74 31 32 38 2d 63 62 63 2c 63 61 73 74 31 32 38 2d 63 74 72 2c 69 64 65 61 2d 63 62 63 2c 69 64 65 61 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 74 72 2c 73 65 72
70 65 6e 74 31 39 32 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 74 72 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 62 63 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 74 72 2c 33 64 65 73 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 62 63 2c 74 77 6f
66 69 73 68 31 32 38 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 74 72 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 62 63 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 74 72 2c 74 77 6f 66 69 73 68 2d 63 62 63 2
c 61 72 63 66 6f 75 72 2c 61 72 63 66 6f 75 72 31 32 38 2c 61 72 63 66 6f 75 72 32 35 36 00 00 01 75 61 65 73 31 32 38 2d 63 74 72 2c 61 65 73 31 39 32 2d 63 74 72 2c 61 65 73 32 35 36 2d 63 74 72 2c 61 65 73 31 32 38 2d 63 62 63 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 65 73 32 35 36 2d 63 62 63 2c 33 64 65 73 2d 63 62 63 2c 62 6c 6f 77 66 69 73 68 2d 63 62 63 2c 62 6c 6f 77 66 69 73 68 2d 63 74 72 2c 63 61 73 74 31 32 38 2d 63 62 63 2c 63 61 73 74 31 32 38 2d 63 74 72 2c 69 64 65 61 2d 63 62 63 2c 69 64 65 61 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 32 38 2d 63 74 72 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 62 63 2c 73 65 72 70 65 6e 74 31 39 32 2d 63 74 72 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 62 63 2c 73 65 72 70 65 6e 74 32 35 36 2d 63 74 72 2c 33 64 65 73 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 32 38 2d 63 74 72 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 62 63 2c 74 77 6f 66 69 73 68 31 39 32 2d 63 74 72 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 62 63 2c 74 77 6f 66 69 73 68 32 35 36 2d 63 74 72 2c 74 77 6f 66 69 73 68 2d 63 62 63 2c 61 72 63 66 6f 75 72 2c 61 72 63 66 6f 75 72 31 32 38 2c 61 72 63 66 6f 75 72 32 35 36 00 00 00 47 68 6d 61 63 2d 73 68 61 31 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 2c 68 6d 61 63 2d 6d 64 35 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 00 00 00 47 68 6d 61 63 2d 73 68 61 31 2c 68 6d 61 63 2d 73 68 61 31 2d 39 36 2c 68 6d 61 63 2d 6d 64 35 2c 68 6d 61 63 2d 6d 64 35 2d 39 36 2c 68 6d 61 63 2d 73 68 61 32 2d 32 35 36 2c 68 6d 61 63 2d 73 68 61 32 2d 35 31 32 00 00 00 04 6e 6f 6e 65 00 00 00 04 6e 6f 6e 65 00 00 00 00 00 00 00 00 00 00 00 00 00
2021-03-09 20:42:45,771 [reader] DEBUG transport.KeyExchanger - Negotiated algorithms: [ kex=diffie-hellman-group1-sha1; sig=ssh-dss; c2sCipher=3des-cbc; s2cCipher=3des-cbc; c2sMAC=hmac-sha1; s2cMAC=hmac-sha1; c2sComp=none; s2cComp=none ]
2021-03-09 20:42:45,789 [reader] DEBUG kex.DHG1 - Sending SSH_MSG_KEXDH_INIT
2021-03-09 20:42:45,789 [reader] TRACE transport.Encoder - Encoding packet #0: 1e 00 00 00 81 00 c0 55 08 d0 b5 d3 76 22 ca 56 51 f6 82 9b 2d 25 d0 76 eb 25 df b8 f5 9d 8c bb df 5a 4a 34 a5 e7 69 4e b2 10 60 fa 24 c9 a3 39 63 c1 dd 46 c4 38 47 a8 4e d2 c1 b1 16 3b 9f 17 4f 23 3e 84 c4 eb 3a fd 69 67 a8 69 0d a9 23 09 2c 70 43 b7 d7 2f 46 6b 14 e8 72 ad 25 1d bc e8 b4 f6 be 2e d7 1f 94 46 fa 71 53 48 32 41 e7 58 60 50 c3 e7 53 48 22 2d cd f8 56 1b df f5 34 d0 ef 98 d1 51 4f 3b
2021-03-09 20:42:46,310 [reader] TRACE transport.Decoder - Received packet #1: 1f 00 00 01 b0 00 00 00 07 73 73 68 2d 64 73 73 00 00 00 81 00 a6 5f ea ab 51 1c 61 e3 3d f3 8f dd da f0 3b 59 b6 f2 5e 1f a4 de 57 e5 cf 00 ae 47 8a 85 5d da 4f 36 38 d3 8b b0 0a c4 af 7d 84 14 c3 fb 36 e0 4f bd f3 d3 16 67 12 d4 3b 42 1b fa 75 7e 85 69 4a d2 7c 48 f3 96 d0 3c 8b ce 8d a5 8d b5 b8 20 39 f3 5d cf 85 72 35 c2 f1 c7 3b 22 26 a3 61 42 91 90 dc b5 b6 cd 0e df b0 ff 69 33 90 0b 02 ce cc 0c e6 92 74 d8 da e7 c6 94 80 43 18 d6 d6 b9 00 00 00 15 00 b5 af d2 f9 32 46 b1 ef cd 1f 3a 7c 24 0c 1e 9e 21 a3 63 0b 00 00 00 7f 7b bd 2c 5d c9 17 a5 e0 8b 9c 2f 80 a4 9f b6 3f cd 5c 05 78 ba 70 1e 25 4f e3 53 0d ed d3 b6 68 0a 6e 5a fb 32 80 b5 3f 15 40 28 ba ff f7 3d 1b a0 fd b0 00 4b 9e b0 db f2 4b 29 5b f2 a3 56 91 3c d1 c0 be 03 c5 10 3a 1d a8 b7 3e 76 70 b5 6d 71 6e d5 54 7a f6 7b 50 61 31 1e ea 24 5e 2e 5c 33 78 43 cb c1 35 b9 b9 c1 87 75 d5 d5 6c fd a3 1b 74 7e 24 49 86 1a df 3b 3f 72 71 89 c0 a3 00 00 00 80 6b 19 8c d1 a2 fa f6 7f 9a 32 aa 9d f1 f3 9c 5c be 0d 90 1f 5c fa 48 3e bf 62 0c a6 40 53 0f cf 27 06 a9 ce 75 90 1e 86 e1 65 cf 06 66 9f 38 b7 16 6b e5 dd 5d e1 f5 2b a8 a0 3e 15 c9 b4 5c b5 95 cd 7a 80 30 7c 7a ac 45 7a f0 c2 9e 5b eb 37 c8 f5 7e df 5a 20 44 d4 91 da 13 18 bd 54 73 d1 42 76 09 07 79 a3 d4 bd b1 cf 2e 33 eb 77 46 03 7c a4 ce a2 90 91 32 ce 10 b2 7f ab 8f a2 97 af 00 00 00 81 00 f4 49 cb c9 51 4c 86 c8 e6 39 2c f1 98 9f 4a 7e c4 24 c9 28 98 dc e2 1d 9e cd 79 a6 ea 5e 96 57 2d c7 73 a2 41 41 d5 00 64 42 a0 e5 08 97 ec e5 c3 e6 6c aa 6c 55 67 ad f2 a9 b6 c0 d1 8d e4 26 09 3c fc e3 81 a8 a0 15 4e db 38 2e ff cb b2 7a 4f 87 84 22 1d e1 7b d5 7d a5 35 a2 fe e0 b4 5e 4e e3 7c 1d 83 ee 7b 6c 17 de 3c f6 eb f4 d4 84 cf fa 1f 25 68 24 36 fb f8 b4 68 bb 18 0f fb 6c 00 00 00 37 00 00 00 07 73 73 68 2d 64 73 73 00 00 00 28 0e 31 90 5b 0c 6e 52 4b 2a 1f ea 50 a8 c2 c3 eb 25 ba 33 23 81 86 f9 70 de fe 9b 5a d9 46 a2 03 87 e8 42 b0 90 b3 02 3f
2021-03-09 20:42:46,311 [reader] TRACE transport.TransportImpl - Received packet KEXDH_31
2021-03-09 20:42:46,311 [reader] DEBUG transport.KeyExchanger - Received kex followup data
2021-03-09 20:42:46,311 [reader] DEBUG kex.DHG1 - Received SSH_MSG_KEXDH_REPLY
2021-03-09 20:42:46,337 [reader] DEBUG transport.KeyExchanger - Trying to verify host key with net.schmizz.sshj.transport.verification.PromiscuousVerifier@228aab19
2021-03-09 20:42:46,337 [reader] DEBUG transport.KeyExchanger - Sending SSH_MSG_NEWKEYS
2021-03-09 20:42:46,337 [reader] TRACE transport.Encoder - Encoding packet #1: 15
2021-03-09 20:42:46,353 [reader] TRACE transport.Decoder - Received packet #2: 15
2021-03-09 20:42:46,353 [reader] TRACE transport.TransportImpl - Received packet NEWKEYS
2021-03-09 20:42:46,353 [reader] DEBUG transport.KeyExchanger - Received SSH_MSG_NEWKEYS
2021-03-09 20:42:46,359 [pool-InterpreterHandler_TELNET-thread-1] DEBUG sshj.SSHClient - Key exchange took 0.595 seconds
```

Additional info: the SSH server is a bit odd and needs the flag '-c 3des-cbc' from the command line:
```
$ ssh -v xxxxxx@10.238.94.252
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for *
debug1: Connecting to 10.238.94.252 [10.238.94.252] port 22.
debug1: Connection established.
...
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
debug1: Remote protocol version 2.0, remote software version RomSShell_4.31
debug1: no match: RomSShell_4.31
debug1: Authenticating to 10.238.94.252:22 as 'xxxxxx'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: diffie-hellman-group1-sha1
debug1: kex: host key algorithm: ssh-dss
Unable to negotiate with 10.238.94.252 port 22: no matching cipher found. Their offer: 3des-cbc
```

I can run any test you need, but the server is an embedded one so I can't modify it.

Thanks!