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/*
* Copyright 2021, 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.
*/
#define LOG_TAG "PresentationSession"
#include "PresentationSession.h"
#include "IdentityCredentialStore.h"
#include <android/hardware/identity/support/IdentityCredentialSupport.h>
#include <string.h>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <cppbor.h>
#include <cppbor_parse.h>
#include "FakeSecureHardwareProxy.h"
#include "IdentityCredential.h"
#include "PresentationSession.h"
namespace aidl::android::hardware::identity {
using ::std::optional;
using namespace ::android::hardware::identity;
PresentationSession::~PresentationSession() {}
int PresentationSession::initialize() {
if (!hwProxy_->initialize()) {
LOG(ERROR) << "hwProxy->initialize failed";
return IIdentityCredentialStore::STATUS_FAILED;
}
optional<uint64_t> id = hwProxy_->getId();
if (!id) {
LOG(ERROR) << "Error getting id for session";
return IIdentityCredentialStore::STATUS_FAILED;
}
id_ = id.value();
optional<vector<uint8_t>> ephemeralKeyPriv = hwProxy_->getEphemeralKeyPair();
if (!ephemeralKeyPriv) {
LOG(ERROR) << "Error getting ephemeral private key for session";
return IIdentityCredentialStore::STATUS_FAILED;
}
optional<vector<uint8_t>> ephemeralKeyPair =
support::ecPrivateKeyToKeyPair(ephemeralKeyPriv.value());
if (!ephemeralKeyPair) {
LOG(ERROR) << "Error creating ephemeral key-pair";
return IIdentityCredentialStore::STATUS_FAILED;
}
ephemeralKeyPair_ = ephemeralKeyPair.value();
optional<uint64_t> authChallenge = hwProxy_->getAuthChallenge();
if (!authChallenge) {
LOG(ERROR) << "Error getting authChallenge for session";
return IIdentityCredentialStore::STATUS_FAILED;
}
authChallenge_ = authChallenge.value();
return IIdentityCredentialStore::STATUS_OK;
}
ndk::ScopedAStatus PresentationSession::getEphemeralKeyPair(vector<uint8_t>* outKeyPair) {
*outKeyPair = ephemeralKeyPair_;
return ndk::ScopedAStatus::ok();
}
ndk::ScopedAStatus PresentationSession::getAuthChallenge(int64_t* outChallenge) {
*outChallenge = authChallenge_;
return ndk::ScopedAStatus::ok();
}
ndk::ScopedAStatus PresentationSession::setReaderEphemeralPublicKey(
const vector<uint8_t>& publicKey) {
// We expect the reader ephemeral public key to be same size and curve
// as the ephemeral key we generated (e.g. P-256 key), otherwise ECDH
// won't work. So its length should be 65 bytes and it should be
// starting with 0x04.
if (publicKey.size() != 65 || publicKey[0] != 0x04) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
IIdentityCredentialStore::STATUS_FAILED,
"Reader public key is not in expected format"));
}
readerPublicKey_ = publicKey;
vector<uint8_t> pubKeyP256(publicKey.begin() + 1, publicKey.end());
if (!hwProxy_->setReaderEphemeralPublicKey(pubKeyP256)) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
IIdentityCredentialStore::STATUS_FAILED,
"Error setting readerEphemeralPublicKey for session"));
}
return ndk::ScopedAStatus::ok();
}
ndk::ScopedAStatus PresentationSession::setSessionTranscript(
const vector<uint8_t>& sessionTranscript) {
sessionTranscript_ = sessionTranscript;
if (!hwProxy_->setSessionTranscript(sessionTranscript)) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
IIdentityCredentialStore::STATUS_FAILED,
"Error setting SessionTranscript for session"));
}
return ndk::ScopedAStatus::ok();
}
ndk::ScopedAStatus PresentationSession::getCredential(
const vector<uint8_t>& credentialData, shared_ptr<IIdentityCredential>* outCredential) {
shared_ptr<PresentationSession> p = ref<PresentationSession>();
shared_ptr<IdentityCredential> credential = ndk::SharedRefBase::make<IdentityCredential>(
hwProxyFactory_, credentialData, p, hardwareInformation_);
int ret = credential->initialize();
if (ret != IIdentityCredentialStore::STATUS_OK) {
return ndk::ScopedAStatus(AStatus_fromServiceSpecificErrorWithMessage(
ret, "Error initializing IdentityCredential"));
}
*outCredential = std::move(credential);
return ndk::ScopedAStatus::ok();
}
uint64_t PresentationSession::getSessionId() {
return id_;
}
vector<uint8_t> PresentationSession::getSessionTranscript() {
return sessionTranscript_;
}
vector<uint8_t> PresentationSession::getReaderEphemeralPublicKey() {
return readerPublicKey_;
}
} // namespace aidl::android::hardware::identity
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