text: import hashlib
  from shippo.error import APIError
  
  
  BLACKLISTED_DIGESTS = {
  }
  
  
  def verify(hostname, certificate):
      """Verifies a PEM encoded certficate against a blacklist of known revoked
      fingerprints.
  
      returns True on success, raises RuntimeError on failure.
      """
  
      if hostname not in BLACKLISTED_DIGESTS:
          return True
  
      sha = hashlib.sha1()
      sha.update(certificate)
      fingerprint = sha.hexdigest()
  
      if fingerprint in BLACKLISTED_DIGESTS[hostname]:
          raise APIError("Invalid server certificate. You tried to "
                         "connect to a server that has a revoked "
                         "SSL certificate, which means we cannot "
                         "securely send data to that server. "
                         "Please email support@goshippo.com if you "
                         "need help connecting to the correct API "
                         "server.")
      return True
  