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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.keystore;
import android.security.Credentials;
import android.security.KeyStore;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.KeyFactorySpi;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.security.spec.PKCS8EncodedKeySpec;
/**
* {@link KeyFactorySpi} backed by Android KeyStore.
*
* @hide
*/
public class AndroidKeyStoreKeyFactorySpi extends KeyFactorySpi {
private final KeyStore mKeyStore = KeyStore.getInstance();
@Override
protected <T extends KeySpec> T engineGetKeySpec(Key key, Class<T> keySpecClass)
throws InvalidKeySpecException {
if (keySpecClass == null) {
throw new InvalidKeySpecException("keySpecClass == null");
}
if (!(key instanceof AndroidKeyStorePrivateKey)) {
throw new InvalidKeySpecException("Only Android KeyStore private keys supported: " +
((key != null) ? key.getClass().getName() : "null"));
}
if (PKCS8EncodedKeySpec.class.isAssignableFrom(keySpecClass)) {
throw new InvalidKeySpecException(
"Key material export of Android KeyStore keys is not supported");
}
if (!KeyInfo.class.equals(keySpecClass)) {
throw new InvalidKeySpecException("Unsupported key spec: " + keySpecClass.getName());
}
String keyAliasInKeystore = ((AndroidKeyStoreKey) key).getAlias();
String entryAlias;
if (keyAliasInKeystore.startsWith(Credentials.USER_PRIVATE_KEY)) {
entryAlias = keyAliasInKeystore.substring(Credentials.USER_PRIVATE_KEY.length());
} else {
throw new InvalidKeySpecException("Invalid key alias: " + keyAliasInKeystore);
}
@SuppressWarnings("unchecked")
T result = (T) AndroidKeyStoreSecretKeyFactorySpi.getKeyInfo(
mKeyStore, entryAlias, keyAliasInKeystore);
return result;
}
@Override
protected PrivateKey engineGeneratePrivate(KeySpec spec) throws InvalidKeySpecException {
throw new UnsupportedOperationException(
"To generate a key pair in Android KeyStore, use KeyPairGenerator initialized with"
+ " " + KeyGenParameterSpec.class.getName());
}
@Override
protected PublicKey engineGeneratePublic(KeySpec spec) throws InvalidKeySpecException {
throw new UnsupportedOperationException(
"To generate a key pair in Android KeyStore, use KeyPairGenerator initialized with"
+ " " + KeyGenParameterSpec.class.getName());
}
@Override
protected Key engineTranslateKey(Key arg0) throws InvalidKeyException {
throw new UnsupportedOperationException(
"To import a key into Android KeyStore, use KeyStore.setEntry with "
+ KeyProtection.class.getName());
}
}
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