// Copyright 2022 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
library fuchsia.tpm;

using zx;

/// A larger than required TPM maximum command buffer.
const MAX_TPM_COMMAND_LEN uint32 = 20000;

/// Fuchsia implementation of the TCG TSS 2.0 TPM Command Transmission
/// Interface API Specification. This is intended to be used by TSS 2.0
/// compliant libraries to implement userland TPM libraries. 
@discoverable
closed protocol Command {
    /// Submit a TPM2 command to be executed by the Resource Manager & TAB.
    /// Error conditions:
    /// ZX_UNAVAILABLE will be returned if the TPM cannot be accessed.
    /// ZX_TIMED_OUT will be returned if the TPM hardware hits the TCG timeouts.
    strict Transmit(struct {
        data vector<byte>:MAX_TPM_COMMAND_LEN;
    }) -> (struct {
        data vector<byte>:MAX_TPM_COMMAND_LEN;
    }) error zx.Status;
};