EvaluateHashes.swift

// For each certificate in the valid trust:
for index in 0..<SecTrustGetCertificateCount(serverTrust) {
  // Get the public key data for the certificate at the current index of the loop.
  guard let certificate = SecTrustGetCertificateAtIndex(serverTrust, index),
    let publicKey = SecCertificateCopyPublicKey(certificate),
    let publicKeyData = SecKeyCopyExternalRepresentation(publicKey, nil) else {
      return false
  }

  // Hash the key, and check it's validity.
  let keyHash = hash(data: (publicKeyData as NSData) as Data)
  if hashes.contains(keyHash) {
    // Success! This is our server!
    return true
  }
}
// If none of the calculated hashes match any of our stored hashes, the connection we tried to establish is untrusted.
return false