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List:       openssh-unix-dev
Subject:    Re: how is the sha fingerprint generated?
From:       Emmanuel Vadot <elbarto () bocal ! org>
Date:       2015-06-30 17:20:46
Message-ID: 20150630192046.145a5a935cfa991ba21244fe () bocal ! org
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 It does works with rsa, ecdsa and ed25519.
 For ed25519 you may need to remove the extra = (base64 padding byte) at the end of \
the sum.  And I've been lying when I said it does the same as ssh-keygen -fl, the \
first argument must be the public key not the path.

On Tue, 30 Jun 2015 18:43:36 +0200
Johannes Löthberg <johannes@kyriasis.com> wrote:

> On 30/06, Emmanuel Vadot wrote:
> > 
> > You really don't need openssl for that.
> > 
> > And the fingerprints are simple.
> > Here is a python script that do the same as ssh-keygen
> > -fl /path/to/key :
> > 
> > #!/usr/bin/env python3
> > 
> > import binascii
> > import hashlib
> > import sys
> > 
> > if __name__ == "__main__":
> > key = binascii.a2b_base64(sys.argv[1])
> > if sys.argv[2] == "md5":
> > m = hashlib.new("md5")
> > m.update(key)
> > print(m.hexdigest())
> > elif sys.argv[2] == "sha256":
> > m = hashlib.new("sha256")
> > m.update(key)
> > print(binascii.b2a_base64(m.digest()).decode("utf8")[0:-1])
> > 
> > Do use it in production, do some test, but the general idea is there.
> > 
> 
> That doesn't actually work for either RSA nor Ed25519 keys?
> 
> Example: https://theos.kyriasis.com/~kyrias/s/mX8U0VzI5w.png
> 
> -- 
> Sincerely,
> Johannes Löthberg
> PGP Key ID: 0x50FB9B273A9D0BB5
> https://theos.kyriasis.com/~kyrias/


-- 
Emmanuel Vadot <elbarto@bocal.org>
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