DemesneGH commented on code in PR #171: URL: https://github.com/apache/incubator-teaclave-trustzone-sdk/pull/171#discussion_r1975348374
########## examples/secure_db_abstraction-rs/ta/src/secure_db/backend.rs: ########## @@ -0,0 +1,90 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you 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. + +use anyhow::{bail, Result}; +use optee_utee::{DataFlag, ObjectStorageConstants, PersistentObject}; + +// Wrapper functions for OP-TEE raw API + +pub fn save_in_secure_storage(obj_id: &[u8], data: &[u8]) -> Result<()> { + let obj_data_flag = DataFlag::ACCESS_READ + | DataFlag::ACCESS_WRITE + | DataFlag::ACCESS_WRITE_META + | DataFlag::OVERWRITE; + + match PersistentObject::create( + ObjectStorageConstants::Private, + obj_id, + obj_data_flag, + None, + data, + ) { + Err(e) => { + bail!("[-] {:?}: failed to create object: {:?}", &obj_id, e); + } + Ok(_) => { + return Ok(()); + } + } +} + +pub fn load_from_secure_storage(obj_id: &[u8]) -> Result<Option<Vec<u8>>> { + match PersistentObject::open( + ObjectStorageConstants::Private, + obj_id, + DataFlag::ACCESS_READ | DataFlag::SHARE_READ, + ) { + Err(e) => match e.kind() { + optee_utee::ErrorKind::ItemNotFound => { + return Ok(None); + } + _ => { + bail!("[-] {:?}: failed to open object: {:?}", &obj_id, e); + } + }, + + Ok(object) => { + let obj_info = object.info()?; + let mut buf = vec![0u8; obj_info.data_size() as usize]; + + let read_bytes = object.read(&mut buf)?; + if read_bytes != obj_info.data_size() as u32 { + bail!("[-] {:?}: failed to read data", &obj_id); + } + + return Ok(Some(buf)); + } + } +} + +pub fn delete_from_secure_storage(obj_id: &[u8]) -> Result<()> { + match PersistentObject::open( + ObjectStorageConstants::Private, + &obj_id, + DataFlag::ACCESS_READ | DataFlag::ACCESS_WRITE_META, + ) { + Err(e) => { + bail!("[-] {:?}: failed to open object: {:?}", &obj_id, e); + } + + Ok(mut object) => { + object.close_and_delete()?; + std::mem::forget(object); Review Comment: This comes from legacy example code `secure_storage-rs` and related explanation is: https://github.com/apache/incubator-teaclave-trustzone-sdk/blob/main/optee-utee/src/object.rs#L1087-L1089 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: dev-unsubscr...@teaclave.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@teaclave.apache.org For additional commands, e-mail: dev-h...@teaclave.apache.org
