SFTP: can not use ssh public keys in ssh-ed25519 format ?

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Sébastien Bruchez

• March 09, 2022 14:11

Hello

A customer has sent us a new SSH public key, generated with ed25519. I can't load it and got the following message:

Unable to read public key file The file does not appear to contain a public key in any recognized format. The public key file can be in RFC 4716 SSH format, OpenSSH v2 format, or from a PEM or DER encoded certificate. Reported errors: SSH format error: Line too long OpenSSH format error: Unable to retrieve SSH key from encoded data SSL format error: Error reading PEM certificate file: no start line

I searched the documentation for key type support and didn't found any details for ed25519. Is anyone using this format with Cerberus 12.2.2.0?

Cheers, Sébastien

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• Official comment

  

  Ian Butteriss

  • March 09, 2022 14:18

  Hi Sébastien,

  Unfortunately we do not support ed25519 formatted keys yet. At the moment, the public key file needs to be in RFC 4716 SSH or OpenSSH v2 format, or from a PEM or DER-encoded certificate. We have an open enhancement request to support ed25519 keys that is actually in progress and we hope to have it out soon. I can't say yet exactly when that will be introduced, but it's in progress, but may not be long.

  Ian

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  Sébastien Bruchez

  • March 09, 2022 14:36

  Hi Ian, thank you for the explanation !

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