public static string HashFromPublicKey(string publicKey)
{
// Convert to DER format.
var der = publicKey.Substring("-----BEGIN PUBLIC KEY-----".Length, publicKey.Length - "-----BEGIN PUBLIC KEY-----".Length - ("-----END PUBLIC KEY-----".Length));
var data = Convert.FromBase64String(der).ToList().Skip(22);
data = new SHA1Managed().ComputeHash(data.ToArray());
var hash = Base32.ToBase32String(data.ToArray()).Substring(0, 16);
return hash;
}