keystore/keystore_get_wifi_hidl.cpp

/* Copyright 2017 The Android Open Source Project
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

#include <android/system/wifi/keystore/1.0/IKeystore.h>
#include <log/log.h>

#include <keystore/keystore_get.h>

using namespace android;

using android::hardware::hidl_string;
using android::hardware::hidl_vec;
using android::hardware::Return;
using android::sp;
using android::system::wifi::keystore::V1_0::IKeystore;

ssize_t keystore_get(const char *key, size_t keyLength, uint8_t** value) {
    if (key == NULL || keyLength == 0 || value == NULL) {
        ALOGE("Null pointer argument passed");
        return -1;
    }

    sp<IKeystore> service = IKeystore::tryGetService();
    if (service == NULL) {
        ALOGE("could not contact keystore HAL");
        return -1;
    }

    ssize_t return_size;
    bool success = false;
    auto cb = [&](IKeystore::KeystoreStatusCode status, hidl_vec<uint8_t> returnedValue) {
        if (status == IKeystore::KeystoreStatusCode::SUCCESS) {
            return_size = returnedValue.size();
            *value = returnedValue.releaseData();
            success = true;
        }
    };

    Return<void> ret = service->getBlob(hidl_string(key, keyLength), cb);
    return ret.isOk() && success ? return_size : -1;
}