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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #define LOG_TAG "SyntheticPasswordManager"
     18 
     19 #include <nativehelper/JNIHelp.h>
     20 #include "jni.h"
     21 
     22 #include <android_runtime/Log.h>
     23 #include <utils/Timers.h>
     24 #include <utils/misc.h>
     25 #include <utils/String8.h>
     26 #include <utils/Log.h>
     27 #include <gatekeeper/password_handle.h>
     28 
     29 
     30 extern "C" {
     31 #include "crypto_scrypt.h"
     32 }
     33 
     34 namespace android {
     35 
     36 static jlong android_server_SyntheticPasswordManager_nativeSidFromPasswordHandle(JNIEnv* env, jobject, jbyteArray handleArray) {
     37 
     38     jbyte* data = (jbyte*)env->GetPrimitiveArrayCritical(handleArray, NULL);
     39 
     40     if (data != NULL) {
     41         const gatekeeper::password_handle_t *handle =
     42                 reinterpret_cast<const gatekeeper::password_handle_t *>(data);
     43         jlong sid = handle->user_id;
     44         env->ReleasePrimitiveArrayCritical(handleArray, data, JNI_ABORT);
     45         return sid;
     46     } else {
     47         return 0;
     48     }
     49 }
     50 
     51 static jbyteArray android_server_SyntheticPasswordManager_nativeScrypt(JNIEnv* env, jobject, jbyteArray password, jbyteArray salt, jint N, jint r, jint p, jint outLen) {
     52     if (!password || !salt) {
     53         return NULL;
     54     }
     55 
     56     int passwordLen = env->GetArrayLength(password);
     57     int saltLen = env->GetArrayLength(salt);
     58     jbyteArray ret = env->NewByteArray(outLen);
     59 
     60     jbyte* passwordPtr = (jbyte*)env->GetByteArrayElements(password, NULL);
     61     jbyte* saltPtr = (jbyte*)env->GetByteArrayElements(salt, NULL);
     62     jbyte* retPtr = (jbyte*)env->GetByteArrayElements(ret, NULL);
     63 
     64     int rc = crypto_scrypt((const uint8_t *)passwordPtr, passwordLen,
     65                        (const uint8_t *)saltPtr, saltLen, N, r, p, (uint8_t *)retPtr,
     66                        outLen);
     67     env->ReleaseByteArrayElements(password, passwordPtr, JNI_ABORT);
     68     env->ReleaseByteArrayElements(salt, saltPtr, JNI_ABORT);
     69     env->ReleaseByteArrayElements(ret, retPtr, 0);
     70 
     71     if (!rc) {
     72         return ret;
     73     } else {
     74         SLOGE("scrypt failed");
     75         return NULL;
     76     }
     77 }
     78 
     79 static const JNINativeMethod sMethods[] = {
     80      /* name, signature, funcPtr */
     81     {"nativeSidFromPasswordHandle", "([B)J", (void*)android_server_SyntheticPasswordManager_nativeSidFromPasswordHandle},
     82     {"nativeScrypt", "([B[BIIII)[B", (void*)android_server_SyntheticPasswordManager_nativeScrypt},
     83 };
     84 
     85 int register_android_server_SyntheticPasswordManager(JNIEnv* env) {
     86     return jniRegisterNativeMethods(env, "com/android/server/locksettings/SyntheticPasswordManager",
     87                                     sMethods, NELEM(sMethods));
     88 }
     89 
     90 } /* namespace android */
     91