[dice] Move format_condig_descriptor to diced_open_dice
Test: atest diced_utils_test diced_sample_inputs_test \
diced_test diced_vendor_test diced_open_dice_cbor_test \
diced_client_test
Test: m pvmfw_img microdroid_manager
Test: atest microdroid_manager_test vmbase_example.integration_test
Bug: 267575445
Change-Id: Iba7f775c1d1a3070c119da546edad38c2bbf67ac
diff --git a/diced/open_dice/src/bcc.rs b/diced/open_dice/src/bcc.rs
new file mode 100644
index 0000000..8bda225
--- /dev/null
+++ b/diced/open_dice/src/bcc.rs
@@ -0,0 +1,56 @@
+// Copyright 2023, The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! This module mirrors the content in open-dice/include/dice/android/bcc.h
+
+use crate::error::{check_result, Result};
+use open_dice_bcc_bindgen::{
+ BccConfigValues, BccFormatConfigDescriptor, BCC_INPUT_COMPONENT_NAME,
+ BCC_INPUT_COMPONENT_VERSION, BCC_INPUT_RESETTABLE,
+};
+use std::{ffi::CStr, ptr};
+
+/// Formats a configuration descriptor following the BCC's specification.
+/// See https://cs.android.com/android/platform/superproject/+/master:hardware/interfaces/security/rkp/aidl/android/hardware/security/keymint/ProtectedData.aidl
+pub fn bcc_format_config_descriptor(
+ name: Option<&CStr>,
+ version: Option<u64>,
+ resettable: bool,
+ buffer: &mut [u8],
+) -> Result<usize> {
+ let mut inputs = 0;
+ if name.is_some() {
+ inputs |= BCC_INPUT_COMPONENT_NAME;
+ }
+ if version.is_some() {
+ inputs |= BCC_INPUT_COMPONENT_VERSION;
+ }
+ if resettable {
+ inputs |= BCC_INPUT_RESETTABLE;
+ }
+
+ let values = BccConfigValues {
+ inputs,
+ component_name: name.map_or(ptr::null(), |p| p.as_ptr()),
+ component_version: version.unwrap_or(0),
+ };
+
+ let mut buffer_size = 0;
+ // SAFETY: The function writes to the buffer, within the given bounds, and only reads the
+ // input values. It writes its result to buffer_size.
+ check_result(unsafe {
+ BccFormatConfigDescriptor(&values, buffer.len(), buffer.as_mut_ptr(), &mut buffer_size)
+ })?;
+ Ok(buffer_size)
+}