Is SFTP key fingerprint checking unnecessarily complicated?

[denissceluiko]

Description

Q	A
Flysystem Version	3.29.1
Adapter Name	sftp
Adapter version	3.29.0

I wanted to fingerprint the server I'm connecting to so I tried using fingerprint-string option and feed it the output of
ssh-keygen -l -E sha512 -f /etc/ssh/ssh_host_ed25519_key.pub
Sample output: 256 SHA512:[here lies a base64 encoded fingerprint] root@myserver(ED25519)
Well it didn't work so Google I did and found this issue.
Tried MD5, didn't work. After some digging in SftpConnectionProvider.php I think I got the gist of it
What did work?
ssh-keygen -l -E sha512 -f /etc/ssh/ssh_host_ed25519_key.pub | awk '{print $2}' | sed 's/SHA512://' | base64 -d | xxd -p -c 256 | sed 's/../&:/g' | sed 's/:$//'

Gave me a fingerprint that would not fail with Reason: The authenticity of host example.com can't be established

Question

Am I missing something that would make extracting the fingerprint easier?

If not should I make a PR that'd allow fingerprint-string to accept values like:

'fingerprint-string' => 'b1:94:6a:c9:24:92:d2:34:7c:62:35:b4:d2:61:11:84' // Plain MD5
'fingerprint-string' => 'e7:c2:2b:99:4c:59:d9:cf:2b:48:e5:49:b1:e2:46:66:63:60:45:93:0d:3d:a7:c1:ac:b2:99:d1:c3:b7:f9:31:f9:4a:ae:41:ed:da:2c:2b:20:7a:36:e1:0f:8b:cb:8d:45:22:3e:54:87:8f:5b:31:6e:7c:e3:b6:bc:01:96:29' // Plain SHA512, current default for non ssh-rsa keys
'fingerprint-string' => 'MD5:b1:94:6a:c9:24:92:d2:34:7c:62:35:b4:d2:61:11:84' // Plain MD5 with a prefix
'fingerprint-string' => 'SHA256:WJG1tSLV3whtD/CxEPvZ0hu0/HFjrzTQgoai6Eb2vgM=' // Base64 encoded SHA256, within the output of ssh-keyscan example.com | ssh-keygen -lf -
'fingerprint-string' => 'SHA512:58IrmUxZ2c8rSOVJseJGZmNgRZMNPafBrLKZ0cO3+TH5Sq5B7dosKyB6NuEPi8uNRSI+VIePWzFufOO2vAGWKQ==' // Base64 encoded SHA512 

I think that being able to plug in a fingerprint value given by ssh-keyscan example.com | ssh-keygen -lf - (mentioned in the first result of looking up 'how to get server ssh fingerprint') a would make life a lot easier for people not deeply familiar with how fingerprinting works.