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From: Lucio De Re <lucio.dere@gmail.com>
To: 9fans <9fans@9fans.net>
Subject: [9fans] Signature algorithms for P9P ssh-agent
Date: Sat, 11 Feb 2023 06:07:37 +0200	[thread overview]
Message-ID: <CAJQ9t7id_m9wcGXE33=HT0_MMCvMqVdaUVR3NQJgay2HUUP4=g@mail.gmail.com> (raw)

Briefly: I hacked P9P's ssh-agent to handle my 4096-bit RSA key, but
it still interacts poorly with conventional Linux/Debian installations
of OpenSSH. The error message:

agent key RSA SHA256:XXX...XXX returned incorrect signature type

is explained as follows on stackoverflow:

This message means that the SSH connection negotiated a connection
using an RSA key with a different signature algorithm, either SHA-256
or SHA-512. However, the SSH agent, when asked to make the signature
for that connection, provided an SHA-1 signature, which isn't in
compliance with the agent protocol.

Before I tackle the complexities of RSA encryption and decryption, is
there a quick description of where I may be able to add the missing
signature algorithm so I can upgrade the agent and/or factotum (Plan 9
rsaencrypt and rsaencrypt functions are the likely culprits, I just
need some directions to avoid poorly re-inventing the wheel).


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                 reply	other threads:[~2023-02-11  4:07 UTC|newest]

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