public async Task SetItemMetadata(string repo, string passphrase, string itemId, StoredItemMetadata meta)
{
var rawJson = JsonSerializer.Serialize(meta, new() { WriteIndented = false });
var binaryJson = Encoding.UTF8.GetBytes(rawJson);
var metadataPacket = crypto.PassphraseEncrypt(Encoding.UTF8.GetBytes(passphrase), binaryJson);
var serializedPacket = metadataPacket.ToString();
var encryptedMetadata = Encoding.ASCII.GetBytes(serializedPacket);
await driver.WriteMetadata(repo, itemId, encryptedMetadata);
}