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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 com.example.android.fingerprintdialog.server;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;
import java.util.HashMap;
import java.util.Map;
/**
* A fake backend implementation of {@link StoreBackend}.
*/
public class StoreBackendImpl implements StoreBackend {
private final Map<String, PublicKey> mPublicKeys = new HashMap<>();
@Override
public boolean verify(Transaction transaction, byte[] transactionSignature) {
try {
PublicKey publicKey = mPublicKeys.get(transaction.getUserId());
Signature verificationFunction = Signature.getInstance("SHA256withECDSA");
verificationFunction.initVerify(publicKey);
verificationFunction.update(transaction.toByteArray());
if (verificationFunction.verify(transactionSignature)) {
// Transaction is verified with the public key associated with the user
// Do some post purchase processing in the server
return true;
}
} catch (NoSuchAlgorithmException | InvalidKeyException | SignatureException e) {
// In a real world, better to send some error message to the user
}
return false;
}
@Override
public boolean verify(Transaction transaction, String password) {
// As this is just a sample, we always assume that the password is right.
return true;
}
@Override
public boolean enroll(String userId, String password, PublicKey publicKey) {
if (publicKey != null) {
mPublicKeys.put(userId, publicKey);
}
// We just ignore the provided password here, but in real life, it is registered to the
// backend.
return true;
}
}
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