package emu.grasscutter.utils; import java.security.SecureRandom; import java.util.Base64; import emu.grasscutter.Grasscutter; import emu.grasscutter.net.proto.GetPlayerTokenRspOuterClass.GetPlayerTokenRsp; import emu.grasscutter.net.proto.QueryCurrRegionHttpRspOuterClass.QueryCurrRegionHttpRsp; import static emu.grasscutter.Configuration.*; public final class Crypto { private static final SecureRandom secureRandom = new SecureRandom(); public static final long ENCRYPT_SEED = Long.parseUnsignedLong("11468049314633205968"); public static byte[] ENCRYPT_SEED_BUFFER = new byte[0]; public static byte[] DISPATCH_KEY; public static byte[] ENCRYPT_KEY; public static void loadKeys() { DISPATCH_KEY = FileUtils.read(KEYS_FOLDER + "/dispatchKey.bin"); ENCRYPT_KEY = FileUtils.read(KEYS_FOLDER + "/secretKey.bin"); ENCRYPT_SEED_BUFFER = FileUtils.read(KEYS_FOLDER + "/secretKeyBuffer.bin"); } public static void xor(byte[] packet, byte[] key) { try { for (int i = 0; i < packet.length; i++) { packet[i] ^= key[i % key.length]; } } catch (Exception e) { Grasscutter.getLogger().error("Crypto error.", e); } } public static void extractSecretKeyBuffer(byte[] data) { try { GetPlayerTokenRsp p = GetPlayerTokenRsp.parseFrom(data); FileUtils.write(KEYS_FOLDER + "/secretKeyBuffer.bin", p.getSecretKeyBytes().toByteArray()); Grasscutter.getLogger().info("Secret Key: " + p.getSecretKey()); } catch (Exception e) { Grasscutter.getLogger().error("Crypto error.", e); } } public static void extractDispatchSeed(String data) { try { QueryCurrRegionHttpRsp p = QueryCurrRegionHttpRsp.parseFrom(Base64.getDecoder().decode(data)); FileUtils.write(KEYS_FOLDER + "/dispatchSeed.bin", p.getRegionInfo().getSecretKey().toByteArray()); } catch (Exception e) { Grasscutter.getLogger().error("Crypto error.", e); } } public static byte[] createSessionKey(int length) { byte[] bytes = new byte[length]; secureRandom.nextBytes(bytes); return bytes; } }