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      1 /*
      2  * Copyright (C) 2015 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 package android.security.keymaster;
     18 
     19 import android.os.Parcel;
     20 import android.os.Parcelable;
     21 import android.os.ParcelFormatException;
     22 
     23 /**
     24  * Base class for the Java side of a Keymaster tagged argument.
     25  * <p>
     26  * Serialization code for this and subclasses must be kept in sync with system/security/keystore
     27  * and with hardware/libhardware/include/hardware/keymaster_defs.h
     28  * @hide
     29  */
     30 abstract class KeymasterArgument implements Parcelable {
     31     public final int tag;
     32 
     33     public static final Parcelable.Creator<KeymasterArgument> CREATOR = new
     34             Parcelable.Creator<KeymasterArgument>() {
     35                 @Override
     36                 public KeymasterArgument createFromParcel(Parcel in) {
     37                     final int pos = in.dataPosition();
     38                     final int tag = in.readInt();
     39                     switch (KeymasterDefs.getTagType(tag)) {
     40                         case KeymasterDefs.KM_ENUM:
     41                         case KeymasterDefs.KM_ENUM_REP:
     42                         case KeymasterDefs.KM_UINT:
     43                         case KeymasterDefs.KM_UINT_REP:
     44                             return new KeymasterIntArgument(tag, in);
     45                         case KeymasterDefs.KM_ULONG:
     46                         case KeymasterDefs.KM_ULONG_REP:
     47                             return new KeymasterLongArgument(tag, in);
     48                         case KeymasterDefs.KM_DATE:
     49                             return new KeymasterDateArgument(tag, in);
     50                         case KeymasterDefs.KM_BYTES:
     51                         case KeymasterDefs.KM_BIGNUM:
     52                             return new KeymasterBlobArgument(tag, in);
     53                         case KeymasterDefs.KM_BOOL:
     54                             return new KeymasterBooleanArgument(tag, in);
     55                         default:
     56                             throw new ParcelFormatException("Bad tag: " + tag + " at " + pos);
     57                     }
     58                 }
     59 
     60                 @Override
     61                 public KeymasterArgument[] newArray(int size) {
     62                     return new KeymasterArgument[size];
     63                 }
     64             };
     65 
     66     protected KeymasterArgument(int tag) {
     67         this.tag = tag;
     68     }
     69 
     70     /**
     71      * Writes the value of this argument, if any, to the provided parcel.
     72      */
     73     public abstract void writeValue(Parcel out);
     74 
     75     @Override
     76     public int describeContents() {
     77         return 0;
     78     }
     79 
     80     @Override
     81     public void writeToParcel(Parcel out, int flags) {
     82         out.writeInt(tag);
     83         writeValue(out);
     84     }
     85 }
     86