internal static void DecryptAesKey(Encrypted encryptedAesKey, Keychain keychain)
 {
     keychain.Add(AesKey.Parse(Decrypt <R.AesKey>(encryptedAesKey, keychain)));
 }
 internal static void DecryptRsaKey(Encrypted encryptedRsaKey, Keychain keychain)
 {
     keychain.Add(RsaKey.Parse(Decrypt <R.RsaKey>(encryptedRsaKey, keychain)));
 }