91 lines
3.0 KiB
C#
91 lines
3.0 KiB
C#
using System;
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using System.IO;
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using System.Security.Cryptography;
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using PSO2SERVER.Crypto;
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using PSO2SERVER.Protocol.Packets;
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namespace PSO2SERVER.Protocol.Handlers
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{
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[PacketHandlerAttr(0x11, 0x0B)]
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public class KeyExchange : PacketHandler
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{
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#region implemented abstract members of PacketHandler
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public override void HandlePacket(Client context, byte flags, byte[] data, uint position, uint size)
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{
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if (context.InputArc4 != null)
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return;
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if (size < 0x80)
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return;
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// Extract the first 0x80 bytes into a separate array
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var cryptedBlob = new byte[0x80];
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var rsaBlob = File.ReadAllBytes(ServerApp.ServerPrivateKeyBlob);
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Array.Copy(data, position, cryptedBlob, 0, 0x80);
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Array.Reverse(cryptedBlob);
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// Print the contents of cryptedBlob in hexadecimal format
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//var info = string.Format("[<--] 接收到的数据 (hex): {0} 字节", data.Length);
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//Logger.WriteHex(info, cryptedBlob);
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// Convert cryptedBlob to a hexadecimal string
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//var hexString = BitConverter.ToString(cryptedBlob).Replace("-", "");
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// Save the hexadecimal string to a text file
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//File.WriteAllText("cryptedBlob.txt", hexString);
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// FIXME
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if (Client.RsaCsp == null)
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{
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Client.RsaCsp = new RSACryptoServiceProvider();
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Client.RsaCsp.ImportCspBlob(rsaBlob);
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}
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var pkcs = new RSAPKCS1KeyExchangeDeformatter(Client.RsaCsp);
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byte[] decryptedBlob;
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try
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{
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decryptedBlob = pkcs.DecryptKeyExchange(cryptedBlob);
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}
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catch (CryptographicException ex)
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{
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Logger.WriteException("解密RSA密钥交换时发生错误", ex);
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context.Socket.Close();
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return;
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}
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// Also a failure.
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if (decryptedBlob.Length < 0x20)
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{
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Logger.Write("解密RSA密钥交换时发生错误 {0} < 0x20", decryptedBlob.Length);
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context.Socket.Close();
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return;
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}
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// Extract the RC4 key
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var arc4Key = new byte[16];
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Array.Copy(decryptedBlob, 0x10, arc4Key, 0, 0x10);
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// Create three RC4 mungers
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var arc4 = new Arc4Managed {Key = arc4Key};
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context.InputArc4 = arc4.CreateDecryptor();
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arc4 = new Arc4Managed {Key = arc4Key};
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context.OutputArc4 = arc4.CreateEncryptor();
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arc4 = new Arc4Managed {Key = arc4Key};
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var tempDecryptor = arc4.CreateDecryptor();
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// Also, grab the init token for the client
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var decryptedToken = new byte[16];
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tempDecryptor.TransformBlock(decryptedBlob, 0, 0x10, decryptedToken, 0);
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context.SendPacket(new EncryptionResponsePacket(decryptedToken));
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}
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#endregion
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}
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} |