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Merged
Protonull merged 1 commit into from
Mar 31, 2026
Merged

Switch to OAEP padding (reopening) #132

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18 changes: 14 additions & 4 deletions mapsync-mod/src/main/java/gjum/minecraft/mapsync/mod/net/SyncClient.java
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Original file line number Diff line number Diff line change
Expand Up @@ -23,10 +23,12 @@
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.spec.MGF1ParameterSpec;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
Expand All @@ -39,6 +41,8 @@
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.OAEPParameterSpec;
import javax.crypto.spec.PSource;
import javax.crypto.spec.SecretKeySpec;
import net.minecraft.client.Minecraft;
import net.minecraft.client.User;
Expand Down Expand Up @@ -286,7 +290,7 @@ void setUpEncryption(ChannelHandlerContext ctx, ClientboundEncryptionRequestPack
encrypt(packet.publicKey(), sharedSecret),
encrypt(packet.publicKey(), packet.verifyToken())));
} catch (NoSuchAlgorithmException | InvalidKeyException | NoSuchPaddingException | BadPaddingException |
IllegalBlockSizeException e) {
IllegalBlockSizeException | InvalidAlgorithmParameterException e) {
shutDown();
throw new RuntimeException(e);
}
Expand All @@ -299,9 +303,15 @@ void setUpEncryption(ChannelHandlerContext ctx, ClientboundEncryptionRequestPack
handleEncryptionSuccess();
}

private static byte[] encrypt(PublicKey key, byte[] data) throws NoSuchPaddingException, NoSuchAlgorithmException, BadPaddingException, IllegalBlockSizeException, InvalidKeyException {
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.ENCRYPT_MODE, key);
private static byte[] encrypt(PublicKey key, byte[] data) throws NoSuchPaddingException, NoSuchAlgorithmException, BadPaddingException, IllegalBlockSizeException, InvalidKeyException, InvalidAlgorithmParameterException {
Cipher cipher = Cipher.getInstance("RSA/ECB/OAEPWithSHA-256AndMGF1Padding");
// https://docs.openssl.org/master/man3/RSA_public_encrypt/#description
cipher.init(Cipher.ENCRYPT_MODE, key, new OAEPParameterSpec(
"SHA-256",
"MGF1",
new MGF1ParameterSpec("SHA-256"),
PSource.PSpecified.DEFAULT
));
return cipher.doFinal(data);
}
}
3 changes: 2 additions & 1 deletion mapsync-server/src/server.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -51,7 +51,8 @@ export class TcpServer {
return crypto.privateDecrypt(
{
key: this.keyPair.privateKey,
padding: crypto.constants.RSA_PKCS1_PADDING,
padding: crypto.constants.RSA_PKCS1_OAEP_PADDING,
oaepHash: "sha256"
},
buf,
);
Expand Down