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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.security.keystore2;
import android.annotation.NonNull;
import android.security.KeyStoreSecurityLevel;
import android.security.keymaster.KeymasterDefs;
import android.security.keystore.KeyProperties;
import android.system.keystore2.Authorization;
import android.system.keystore2.KeyDescriptor;
import android.system.keystore2.KeyMetadata;
import java.security.interfaces.ECPublicKey;
import java.security.spec.ECParameterSpec;
import java.security.spec.ECPoint;
/**
* {@link ECPublicKey} backed by keystore.
*
* @hide
*/
public class AndroidKeyStoreECPublicKey extends AndroidKeyStorePublicKey implements ECPublicKey {
private final ECParameterSpec mParams;
private final ECPoint mW;
public AndroidKeyStoreECPublicKey(@NonNull KeyDescriptor descriptor,
@NonNull KeyMetadata metadata,
@NonNull byte[] x509EncodedForm,
@NonNull KeyStoreSecurityLevel securityLevel,
@NonNull ECParameterSpec params, @NonNull ECPoint w) {
super(descriptor, metadata, x509EncodedForm, KeyProperties.KEY_ALGORITHM_EC, securityLevel);
mParams = params;
mW = w;
}
public AndroidKeyStoreECPublicKey(@NonNull KeyDescriptor descriptor,
@NonNull KeyMetadata metadata,
@NonNull KeyStoreSecurityLevel securityLevel, @NonNull ECPublicKey info) {
this(descriptor, metadata, info.getEncoded(), securityLevel, info.getParams(), info.getW());
if (!"X.509".equalsIgnoreCase(info.getFormat())) {
throw new IllegalArgumentException(
"Unsupported key export format: " + info.getFormat());
}
}
@Override
public AndroidKeyStorePrivateKey getPrivateKey() {
ECParameterSpec params = mParams;
for (Authorization a : getAuthorizations()) {
try {
if (a.keyParameter.tag == KeymasterDefs.KM_TAG_EC_CURVE) {
params = KeymasterUtils.getCurveSpec(KeymasterUtils.getEcCurveFromKeymaster(
a.keyParameter.value.getEcCurve()));
break;
}
} catch (Exception e) {
throw new RuntimeException("Unable to parse EC curve "
+ a.keyParameter.value.getEcCurve());
}
}
return new AndroidKeyStoreECPrivateKey(
getUserKeyDescriptor(), getKeyIdDescriptor().nspace, getAuthorizations(),
getSecurityLevel(), params);
}
@Override
public ECParameterSpec getParams() {
return mParams;
}
@Override
public ECPoint getW() {
return mW;
}
}
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