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      1 /* Copyright 2017 The Android Open Source Project
      2  *
      3  * Redistribution and use in source and binary forms, with or without
      4  * modification, are permitted provided that the following conditions
      5  * are met:
      6  * 1. Redistributions of source code must retain the above copyright
      7  *    notice, this list of conditions and the following disclaimer.
      8  * 2. Redistributions in binary form must reproduce the above copyright
      9  *    notice, this list of conditions and the following disclaimer in the
     10  *    documentation and/or other materials provided with the distribution.
     11  *
     12  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
     13  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     14  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     15  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
     16  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     17  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     18  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     19  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     20  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     21  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
     22 
     23 #include <android/system/wifi/keystore/1.0/IKeystore.h>
     24 #include <log/log.h>
     25 
     26 #include <keystore/keystore_get.h>
     27 
     28 using namespace android;
     29 
     30 using android::hardware::hidl_string;
     31 using android::hardware::hidl_vec;
     32 using android::hardware::Return;
     33 using android::sp;
     34 using android::system::wifi::keystore::V1_0::IKeystore;
     35 
     36 ssize_t keystore_get(const char *key, size_t keyLength, uint8_t** value) {
     37     if (key == NULL || keyLength == 0 || value == NULL) {
     38         ALOGE("Null pointer argument passed");
     39         return -1;
     40     }
     41 
     42     sp<IKeystore> service = IKeystore::tryGetService();
     43     if (service == NULL) {
     44         ALOGE("could not contact keystore HAL");
     45         return -1;
     46     }
     47 
     48     ssize_t return_size;
     49     bool success = false;
     50     auto cb = [&](IKeystore::KeystoreStatusCode status, hidl_vec<uint8_t> returnedValue) {
     51         if (status == IKeystore::KeystoreStatusCode::SUCCESS) {
     52             return_size = returnedValue.size();
     53             *value = returnedValue.releaseData();
     54             success = true;
     55         }
     56     };
     57 
     58     Return<void> ret = service->getBlob(hidl_string(key, keyLength), cb);
     59     return ret.isOk() && success ? return_size : -1;
     60 }
     61