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// Copyright 2020, 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.
//! Rust binding for getting the attestation application id.
use keystore2_aaid_bindgen::{
aaid_keystore_attestation_id, KEY_ATTESTATION_APPLICATION_ID_MAX_SIZE,
};
/// Returns the attestation application id for the given uid or an error code
/// corresponding to ::android::status_t.
pub fn get_aaid(uid: u32) -> Result<Vec<u8>, u32> {
let mut buffer = [0u8; KEY_ATTESTATION_APPLICATION_ID_MAX_SIZE];
let mut size = KEY_ATTESTATION_APPLICATION_ID_MAX_SIZE;
// Safety:
// aaid_keystore_attestation_id expects a buffer of exactly
// KEY_ATTESTATION_APPLICATION_ID_MAX_SIZE bytes and returns the number of bytes written
// in the second pointer argument.
let status = unsafe { aaid_keystore_attestation_id(uid, buffer.as_mut_ptr(), &mut size) };
match status {
0 => Ok(buffer[0..size as usize].to_vec()),
status => Err(status),
}
}
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