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/*
* Copyright (C) 2022 NotEnoughUpdates contributors
*
* This file is part of NotEnoughUpdates.
*
* NotEnoughUpdates is free software: you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, either
* version 3 of the License, or (at your option) any later version.
*
* NotEnoughUpdates is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with NotEnoughUpdates. If not, see <https://www.gnu.org/licenses/>.
*/
package io.github.moulberry.notenoughupdates.util;
import io.github.moulberry.notenoughupdates.NotEnoughUpdates;
import org.apache.commons.io.IOUtils;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.X509EncodedKeySpec;
public class MoulSigner {
private MoulSigner() {}
static PublicKey publicKey;
static {
try (InputStream is = MoulSigner.class.getResourceAsStream("/moulberry.key")) {
byte[] publicKeyBytes = IOUtils.toByteArray(is);
X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(publicKeyBytes);
publicKey = KeyFactory.getInstance("RSA").generatePublic(x509EncodedKeySpec);
} catch (IOException | NullPointerException | NoSuchAlgorithmException | InvalidKeySpecException e) {
NotEnoughUpdates.LOGGER.error("Cannot initialize MoulSigner", e);
}
}
public static boolean verifySignature(byte[] data, byte[] signatureBytes) {
if (Boolean.getBoolean("neu.noverifysignature")) return true;
if (publicKey == null) {
NotEnoughUpdates.LOGGER.warn("MoulSigner could not be initialized, will fail this request");
return false;
}
try {
Signature signature = Signature.getInstance("SHA256withRSA");
signature.initVerify(publicKey);
signature.update(data);
return signature.verify(signatureBytes);
} catch (NoSuchAlgorithmException | InvalidKeyException | SignatureException e) {
NotEnoughUpdates.LOGGER.error("Error while verifying signature. Considering this as invalid signature", e);
return false;
}
}
public static boolean verifySignature(File file) {
try {
return verifySignature(
IOUtils.toByteArray(file.toURI()),
IOUtils.toByteArray(new File(file.getParentFile(), file.getName() + ".asc").toURI())
);
} catch (IOException e) {
NotEnoughUpdates.LOGGER.error("Ran into an IOException while verifying a signature", e);
return false;
}
}
}
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