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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.keystore;
     18 
     19 import java.security.interfaces.ECPublicKey;
     20 import java.security.spec.ECParameterSpec;
     21 import java.security.spec.ECPoint;
     22 
     23 /**
     24  * {@link ECPublicKey} backed by keystore.
     25  *
     26  * @hide
     27  */
     28 public class AndroidKeyStoreECPublicKey extends AndroidKeyStorePublicKey implements ECPublicKey {
     29 
     30     private final ECParameterSpec mParams;
     31     private final ECPoint mW;
     32 
     33     public AndroidKeyStoreECPublicKey(String alias, int uid, byte[] x509EncodedForm, ECParameterSpec params,
     34             ECPoint w) {
     35         super(alias, uid, KeyProperties.KEY_ALGORITHM_EC, x509EncodedForm);
     36         mParams = params;
     37         mW = w;
     38     }
     39 
     40     public AndroidKeyStoreECPublicKey(String alias, int uid, ECPublicKey info) {
     41         this(alias, uid, info.getEncoded(), info.getParams(), info.getW());
     42         if (!"X.509".equalsIgnoreCase(info.getFormat())) {
     43             throw new IllegalArgumentException(
     44                     "Unsupported key export format: " + info.getFormat());
     45         }
     46     }
     47 
     48     @Override
     49     public ECParameterSpec getParams() {
     50         return mParams;
     51     }
     52 
     53     @Override
     54     public ECPoint getW() {
     55         return mW;
     56     }
     57 }