BRNSystems/chatencryptor
BRNSystems/chatencryptor
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The encoding is broken now

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This commit is contained in:
Bruno Rybársky 2024-04-05 15:49:26 +02:00
parent 7d0e773196
commit 22a7d78152
1 changed files with 24 additions and 32 deletions
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56
src/main/java/systems/brn/chatencryptor/SecureChat.java
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@ -19,57 +19,45 @@ import javax.crypto.NoSuchPaddingException;
import java.nio.charset.StandardCharsets;
import java.security.*;
import java.time.Instant;
import java.util.Base64;
import java.util.Arrays;
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;
KeyPairGenerator kpg;
try {
kpg = KeyPairGenerator.getInstance("RSA");
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
kpg.initialize(1024);
kpg.initialize(512);
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:")){
String player_name = content.getArg(0).getString();
if(message_content.startsWith("®") && message_content.endsWith("®")){
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;
String strippedMessage = message_content.replace("®", "");
byte[] decodedMessage = strippedMessage.getBytes(java.nio.charset.StandardCharsets.UTF_16);
byte[] unpaddedMessage = Arrays.copyOfRange(decodedMessage, 2, decodedMessage.length);
Cipher decryptingCipher = Cipher.getInstance("RSA");
decryptingCipher.init(Cipher.DECRYPT_MODE, privateKey);
decryptingCipher.update(unpaddedMessage);
String decryptedMessage = new String(decryptingCipher.doFinal());
String outputMessage = "{" + player_name + "} " + decryptedMessage;
MinecraftClient.getInstance().inGameHud.getChatHud().addMessage(Text.of(outputMessage));
return false;
}
catch (IllegalBlockSizeException | BadPaddingException e){
catch (IllegalBlockSizeException | BadPaddingException | NoSuchAlgorithmException | NoSuchPaddingException |
InvalidKeyException e){
return true;
}
}
@ -77,14 +65,18 @@ public class SecureChat implements ClientModInitializer {
}
private String encryptChatMessage(String message) {
encryptingCipher.update(message.getBytes(StandardCharsets.UTF_8));
String encodedMessage = null;
String encodedMessage;
try {
encodedMessage = Base64.getEncoder().withoutPadding().encodeToString(encryptingCipher.doFinal());
} catch (IllegalBlockSizeException | BadPaddingException e) {
Cipher encryptingCipher = Cipher.getInstance("RSA");
encryptingCipher.init(Cipher.ENCRYPT_MODE, publicKey);
encryptingCipher.update(message.getBytes(StandardCharsets.UTF_8));
byte[] encryptedMessage = encryptingCipher.doFinal();
encodedMessage = new String(encryptedMessage, java.nio.charset.StandardCharsets.UTF_16);
} catch (IllegalBlockSizeException | BadPaddingException | InvalidKeyException | NoSuchPaddingException |
NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
return "BRNCrypt:" + encodedMessage;
return '®' + encodedMessage + '®';
}
@Override