Instance Configuration page now displays correct SSH fingerprints

Replaces the use of OpenSSL::Digest for
Gitlab::SSHPublicKey#fingerprint

app/models/instance_configuration.rb

@@ -64,10 +64,10 @@ class InstanceConfiguration
   end
 
   def ssh_algorithm_md5(ssh_file_content)
-    OpenSSL::Digest::MD5.hexdigest(ssh_file_content).scan(/../).join(':')
+    Gitlab::SSHPublicKey.new(ssh_file_content).fingerprint
   end
 
   def ssh_algorithm_sha256(ssh_file_content)
-    OpenSSL::Digest::SHA256.hexdigest(ssh_file_content)
+    Gitlab::SSHPublicKey.new(ssh_file_content).fingerprint('SHA256')
   end
 end

changelogs/unreleased/40636-instance-configuration-shows-incorrect-ssh-fingerprints.yml

+---
+title: Instance Configuration page now displays correct SSH fingerprints
+merge_request: 22081
+author:
+type: fixed

spec/fixtures/ssh_host_example_key.pub

-random content
+ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCuRkAgwaap/pXThwCpjX8Wd5tR36Tqx3sW2sVVHs3UKB7kd+xNknw7e4qpuEATv56xHrhKm2+ye/JidTuQ/1EwFhjaz7I5wTslfVawQpeH1ZqAGmvdO/xTw+l7fgEFVlGVx9y0HV3m52y2C9yw82qmg+BohbTVgPtjjutpFc+CwLQxLTnTrRhZf5udQgz+YlwLv+Y0kDx6+DWWOl8N9+TWuGyFKBln79CyBgFcK5NFmF48kYn8W+r7rmawfw9XbuF1aa+6JF+6cNR1mCEonyrRLdXP+vWcxpLKYfejB0NmA1y+W9M/K53AcIHA5zlRQ49tFh0P22eh/Gl8JQ6yyuin foo@bar.mynet

spec/models/instance_configuration_spec.rb

 require 'spec_helper'
 
-RSpec.describe InstanceConfiguration do
+describe InstanceConfiguration do
   context 'without cache' do
     describe '#settings' do
       describe '#ssh_algorithms_hashes' do
-        let(:md5) { '54:e0:f8:70:d6:4f:4c:b1:b3:02:44:77:cf:cd:0d:fc' }
-        let(:sha256) { '9327f0d15a48c4d9f6a3aee65a1825baf9a3412001c98169c5fd022ac27762fc' }
+        let(:md5) { '5a:65:6c:4d:d4:4c:6d:e6:59:25:b8:cf:ba:34:e7:64' }
+        let(:sha256) { 'SHA256:2KJDT7xf2i68mBgJ3TVsjISntg4droLbXYLfQj0VvSY' }
 
         it 'does not return anything if file does not exist' do
           stub_pub_file(exist: false)