On 30/06, shawn wilson wrote:
% cat ext_rsa.pub| sed -r 's/.*(AAAA[^ ]+).*/\1/' | sha256sum ~/.ssh swlap1 d4bf8b06f2d9d9af7a11583a5367205ed310a84f0dee68d062e2ddca1e85c3ff - % ssh-keygen -lf ext_rsa.pub ~/.ssh swlap1 8192 SHA256:FgrfxmdjTM/j4wwRa7nVdPSUaJdqHYMJtJ6aciPl9ug swilson@swlap1 (RSA) Why do those differ and how would i generate the equivalent (mainly just curious)? I've also tried base64 and a few other substitutions at the end and I can't get them to match (probably would save time to just look at the code, but...).
It's not simply a checksum of the key file. You need to extract the exponent and prime from the public key, then append those to a specific string of bits, then get a SHA256 digest of that, and then base64 encode that.
https://github.com/kyrias/bin/blob/master/ssh-gen-fprint has an example implementation of `ssh-keygen -lf` in Ruby.
-- Sincerely, Johannes Löthberg PGP Key ID: 0x50FB9B273A9D0BB5 https://theos.kyriasis.com/~kyrias/
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