BRNSystems/chatencryptor
BRNSystems/chatencryptor
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Add asymetric encryption

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This commit is contained in:
Bruno Rybársky 2024-04-05 14:52:37 +02:00
parent 226e882e99
commit 7d0e773196
4 changed files with 100 additions and 54 deletions
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31
src/main/java/systems/brn/chatencryptor/ChatDecryptorClient.java
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@ -1,31 +0,0 @@
package systems.brn.chatencryptor;
import net.fabricmc.api.ClientModInitializer;
import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents;
import net.fabricmc.fabric.api.client.message.v1.ClientReceiveMessageEvents;
import net.minecraft.client.MinecraftClient;
import net.minecraft.text.Text;
import net.minecraft.text.TranslatableTextContent;
import java.util.Base64;
public class ChatDecryptorClient implements ClientModInitializer {
@Override
public void onInitializeClient() {
ClientLifecycleEvents.CLIENT_STARTED.register(client -> {
// Register event listener for ClientTickEvents.END_CLIENT_TICK
ClientReceiveMessageEvents.ALLOW_CHAT.register((message, signedMessage, sender, params, receptionTimestamp) -> {
TranslatableTextContent content = (TranslatableTextContent) message.getContent();
String message_content = content.getArg(1).getString();
if(message_content.startsWith("BRNCrypt:")){
String strippedMessage = message_content.replace("BRNCrypt:", "");
String decodedMessage = new String(Base64.getDecoder().decode(strippedMessage));
assert sender != null;
String outputMessage = "Decoded from " + sender.getName() + ":" + decodedMessage;
MinecraftClient.getInstance().inGameHud.getChatHud().addMessage(Text.of(outputMessage));
return false;
}
return true;
});
});
}
}

21
src/main/java/systems/brn/chatencryptor/ChatEncryptorClient.java
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@ -1,21 +0,0 @@
package systems.brn.chatencryptor;
import net.fabricmc.api.ClientModInitializer;
import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents;
import net.fabricmc.fabric.api.client.message.v1.ClientSendMessageEvents;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
public class ChatEncryptorClient implements ClientModInitializer {
@Override
public void onInitializeClient() {
ClientLifecycleEvents.CLIENT_STARTED.register(client -> {
// Register event listener for ClientTickEvents.END_CLIENT_TICK
ClientSendMessageEvents.MODIFY_CHAT.register(message -> {
String encodedMessage = Base64.getEncoder().withoutPadding().encodeToString(message.getBytes(StandardCharsets.UTF_8));
return "BRNCrypt:" + encodedMessage;
});
});
}
}

99
src/main/java/systems/brn/chatencryptor/SecureChat.java Normal file
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@ -0,0 +1,99 @@
package systems.brn.chatencryptor;
import com.mojang.authlib.GameProfile;
import net.fabricmc.api.ClientModInitializer;
import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents;
import net.fabricmc.fabric.api.client.message.v1.ClientReceiveMessageEvents;
import net.fabricmc.fabric.api.client.message.v1.ClientSendMessageEvents;
import net.minecraft.client.MinecraftClient;
import net.minecraft.network.message.MessageType;
import net.minecraft.network.message.SignedMessage;
import net.minecraft.text.Text;
import net.minecraft.text.TranslatableTextContent;
import org.jetbrains.annotations.Nullable;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.nio.charset.StandardCharsets;
import java.security.*;
import java.time.Instant;
import java.util.Base64;
public class SecureChat implements ClientModInitializer {
private PublicKey publicKey;
private PrivateKey privateKey;
private Cipher encryptingCipher = null;
private Cipher decryptingCipher = null;
private void initKeys() {
KeyPairGenerator kpg = null;
try {
kpg = KeyPairGenerator.getInstance("RSA");
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
kpg.initialize(1024);
KeyPair kp = kpg.genKeyPair();
publicKey = kp.getPublic();
privateKey = kp.getPrivate();
try {
encryptingCipher = Cipher.getInstance("RSA");
decryptingCipher = Cipher.getInstance("RSA");
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
} catch (NoSuchPaddingException e) {
throw new RuntimeException(e);
}
try {
encryptingCipher.init(Cipher.ENCRYPT_MODE, publicKey);
decryptingCipher.init(Cipher.DECRYPT_MODE, privateKey);
} catch (InvalidKeyException e) {
throw new RuntimeException(e);
}
}
private boolean decryptChatMessage(Text message, @Nullable SignedMessage signedMessage, @Nullable GameProfile sender, MessageType.Parameters params, Instant receptionTimestamp) {
TranslatableTextContent content = (TranslatableTextContent) message.getContent();
String message_content = content.getArg(1).getString();
if(message_content.startsWith("BRNCrypt:")){
try {
String strippedMessage = message_content.replace("BRNCrypt:", "");
byte[] decodedMessage = Base64.getDecoder().decode(strippedMessage);
String decryptedMessage = new String(decryptingCipher.doFinal(decodedMessage));
assert sender != null;
String outputMessage = "{" + sender.getName() + "} " + decryptedMessage;
MinecraftClient.getInstance().inGameHud.getChatHud().addMessage(Text.of(outputMessage));
return false;
}
catch (IllegalBlockSizeException | BadPaddingException e){
return true;
}
}
return true;
}
private String encryptChatMessage(String message) {
encryptingCipher.update(message.getBytes(StandardCharsets.UTF_8));
String encodedMessage = null;
try {
encodedMessage = Base64.getEncoder().withoutPadding().encodeToString(encryptingCipher.doFinal());
} catch (IllegalBlockSizeException | BadPaddingException e) {
throw new RuntimeException(e);
}
return "BRNCrypt:" + encodedMessage;
}
@Override
public void onInitializeClient() {
ClientLifecycleEvents.CLIENT_STARTED.register(client -> {
// Register event listener for ClientTickEvents.END_CLIENT_TICK
initKeys();
ClientReceiveMessageEvents.ALLOW_CHAT.register(this::decryptChatMessage);
ClientSendMessageEvents.MODIFY_CHAT.register(this::encryptChatMessage);
});
}
}

3
src/main/resources/fabric.mod.json
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@ -16,8 +16,7 @@
"environment": "client",
"entrypoints": {
"client": [
"systems.brn.chatencryptor.ChatEncryptorClient",
"systems.brn.chatencryptor.ChatDecryptorClient"
"systems.brn.chatencryptor.SecureChat"
]
},
"depends": {