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/*
* Copyright (c) 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 "credstore"
#include <android-base/logging.h>
#include <android/binder_manager.h>
#include <android/hardware/identity/support/IdentityCredentialSupport.h>
#include <android/security/identity/ICredentialStore.h>
#include <android/security/identity/ISession.h>
#include "Session.h"
#include "Util.h"
namespace android {
namespace security {
namespace identity {
using std::optional;
using ::android::hardware::identity::IPresentationSession;
using ::android::hardware::identity::IWritableIdentityCredential;
using ::android::hardware::identity::support::ecKeyPairGetPkcs12;
using ::android::hardware::identity::support::ecKeyPairGetPrivateKey;
using ::android::hardware::identity::support::ecKeyPairGetPublicKey;
using ::android::hardware::identity::support::hexdump;
using ::android::hardware::identity::support::sha256;
Status Session::getEphemeralKeyPair(vector<uint8_t>* _aidl_return) {
vector<uint8_t> keyPair;
Status status = halBinder_->getEphemeralKeyPair(&keyPair);
if (!status.isOk()) {
return halStatusToGenericError(status);
}
time_t nowSeconds = std::chrono::system_clock::to_time_t(std::chrono::system_clock::now());
time_t validityNotBefore = nowSeconds;
time_t validityNotAfter = nowSeconds + 24 * 60 * 60;
optional<vector<uint8_t>> pkcs12Bytes = ecKeyPairGetPkcs12(keyPair,
"ephemeralKey", // Alias for key
"0", // Serial, as a decimal number
"Credstore", // Issuer
"Ephemeral Key", // Subject
validityNotBefore, validityNotAfter);
if (!pkcs12Bytes) {
return Status::fromServiceSpecificError(ICredentialStore::ERROR_GENERIC,
"Error creating PKCS#12 structure for key pair");
}
*_aidl_return = pkcs12Bytes.value();
return Status::ok();
}
Status Session::setReaderEphemeralPublicKey(const vector<uint8_t>& publicKey) {
Status status = halBinder_->setReaderEphemeralPublicKey(publicKey);
if (!status.isOk()) {
return halStatusToGenericError(status);
}
return Status::ok();
}
Status Session::setSessionTranscript(const vector<uint8_t>& sessionTranscript) {
Status status = halBinder_->setSessionTranscript(sessionTranscript);
if (!status.isOk()) {
return halStatusToGenericError(status);
}
return Status::ok();
}
Status Session::getCredentialForPresentation(const string& credentialName,
sp<ICredential>* _aidl_return) {
return store_->getCredentialCommon(credentialName, cipherSuite_, halBinder_, _aidl_return);
}
Status Session::getAuthChallenge(int64_t* _aidl_return) {
*_aidl_return = 0;
int64_t authChallenge;
Status status = halBinder_->getAuthChallenge(&authChallenge);
if (!status.isOk()) {
return halStatusToGenericError(status);
}
*_aidl_return = authChallenge;
return Status::ok();
}
} // namespace identity
} // namespace security
} // namespace android
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