Re: [tor-dev] generate relay fingerprint without tor given the datadir/keys folder?

On Fri, Feb 03, 2017 at 04:12:00PM +0000, nusenu wrote:

Hi,

given the files within the datadir/keys folder (without the datadir/fingerprint file), is there an easy way to generate the relay fingerprint? (using openssl?)

According to the spec [1] the fingerprint is the SHA1 hash of the public key. (I assume RSA pubkey) According to the tor man page [2] the RSA public key should be in keys/secret_id_key.

openssl rsa -in secret_id_key -pubout| ..? |sha1sum

Not as messy as I thought though: $ openssl rsa -in secret_id_key -outform DER -RSAPublicKey_out | sha1

On GNU/Linux sha1 is probably sha1sum.

Happy hacking -- Ivan Markin