💾 Archived View for thrig.me › tech › ssl › certid.pl captured on 2024-05-10 at 12:40:12.

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#!/usr/bin/env perl
# certid.pl - calculate certificate fingerprints from both the whole
# certificate (typical) and also just the Subject Public Key Info
# section (atypical, but used by amfora and other gemini clients)
use 5.12.0;
use warnings;
use Digest::SHA 'sha256_hex';
use Net::SSLeay;
my $file = shift // die "Usage: certid.pl certificate-file\n";
my $bio  = Net::SSLeay::BIO_new_file( $file, 'r' );
my $cert = Net::SSLeay::PEM_read_bio_X509($bio);
# typical
say Net::SSLeay::X509_get_fingerprint( $cert, 'sha256' );
# how amfora does it
my $pubkey = Net::SSLeay::X509_get_X509_PUBKEY($cert); 
say uc( sha256_hex( $pubkey ) );