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<pre><code>require 'base64' require 'httparty' module GameCenter include HTTParty # HHTTParty settings HTTPARTY_TIMEOUT = 10 def authenticate_game_center_user(gc_public_key_url, gc_player_id, gc_timestamp, gc_salt, gc_unverified_signature) # Get game center public key certificate gc_pkey_certificate = get_gc_public_key_certificate(gc_public_key_url) # Check public key certificate unless public_key_certificate_is_valid?(gc_pkey_certificate) do # Handle error end # Check SSL errors unless OpenSSL.errors.empty? do # Handle OpenSSL errors end # Payload building payload = build_payload(gc_player_id, gc_timestamp, gc_salt) # Test signature unless signature_is_valid?(gc_pkey_certificate, gc_unverified_signature, payload) do # Handle error end # Check SSL errors unless OpenSSL.errors.empty? do # Handle OpenSSL errors end # Return player ID gc_player_id end def build_payload(player_id, timestamp, salt) player_id.encode("UTF-8") + "com.myapp.bundle_id".encode("UTF-8") + [timestamp.to_i].pack("Q>") + salt end private def get_gc_public_key_certificate(url) cert = HTTParty.get(url, timeout: HTTPARTY_TIMEOUT, debug_output: Rails.env.production?) OpenSSL::X509::Certificate.new(cert) rescue SocketError => e puts "Key error: " + e.inspect.to_s end def get_ca_certificate OpenSSL::X509::Certificate.new(File.read('./certs/apple/verisign_class_3_code_signing_2010_ca.cer')) end def public_key_certificate_is_valid?(pkey_cert) pkey_cert.verify(get_ca_certificate.public_key) end def signature_is_valid?(pkey_cert, signature, payload) pkey_cert.public_key.verify(OpenSSL::Digest::SHA1.new, signature, payload) end end </code></pre> Here's my ruby implementation (as module). Thanks to your Objective-C, it has been a lot easier. Please note, I had been forced to download the CA certificate on a third party ssl service website, because the public key certificate hasn't been signed Apple and Apple doesn't provide any CA certificate to validate sandbox game center certificate so far. I haven't tested this in production but it works fine in sandbox mode.
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