[Bug 3831] Invalid key length
bugzilla-daemon at mindrot.org
bugzilla-daemon at mindrot.org
Sun Jun 1 20:23:36 AEST 2025
https://bugzilla.mindrot.org/show_bug.cgi?id=3831
Darren Tucker <dtucker at dtucker.net> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dtucker at dtucker.net
Status|NEW |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Darren Tucker <dtucker at dtucker.net> ---
Stock OpenSSH has not supported keys less that 1024 bits since OpenSSH
7.6 (specifically commit bd636f409) in 2017.
This is a compile-time constant so if you want you can build a modified
OpenSSH by changing this line:
$ grep RSA_MIN *.h
sshkey.h:#define SSH_RSA_MINIMUM_MODULUS_SIZE 1024
(In reply to Orion Alves from comment #0)
[...]
> ssh -oRequiredRSASize=768 root at ciscoAsr1002
Stock OpenSSH has no such option. If you are using a vendor-modified
OpenSSH then you need to report any problems with it to them.
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