initial commit

2017-06-19 17:30:18 -04:00
commit 6e265ea24b
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+/*
+ * Copyright (C) 2012-2017 CypherCore <http://github.com/CypherCore>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+using System;
+using System.Security.Cryptography;
+
+namespace Framework.Cryptography
+{
+    public sealed class WorldCrypt : IDisposable
+    {
+        static readonly byte[] ServerEncryptionKey = { 0x08, 0xF1, 0x95, 0x9F, 0x47, 0xE5, 0xD2, 0xDB, 0xA1, 0x3D, 0x77, 0x8F, 0x3F, 0x3E, 0xE7, 0x00 };
+        static readonly byte[] ServerDecryptionKey = { 0x40, 0xAA, 0xD3, 0x92, 0x26, 0x71, 0x43, 0x47, 0x3A, 0x31, 0x08, 0xA6, 0xE7, 0xDC, 0x98, 0x2A };
+
+        public void Initialize(byte[] sessionKey)
+        {
+            if (IsInitialized)
+                throw new InvalidOperationException("PacketCrypt already initialized!");
+
+            SARC4Encrypt = new SARC4();
+            SARC4Decrypt = new SARC4();
+
+            var encryptSHA1 = new HMACSHA1(ServerEncryptionKey);
+            var decryptSHA1 = new HMACSHA1(ServerDecryptionKey);
+
+            SARC4Encrypt.PrepareKey(encryptSHA1.ComputeHash(sessionKey));
+            SARC4Decrypt.PrepareKey(decryptSHA1.ComputeHash(sessionKey));
+
+            var PacketEncryptionDummy = new byte[0x400];
+            var PacketDecryptionDummy = new byte[0x400];
+
+            SARC4Encrypt.ProcessBuffer(PacketEncryptionDummy, PacketEncryptionDummy.Length);
+            SARC4Decrypt.ProcessBuffer(PacketDecryptionDummy, PacketDecryptionDummy.Length);
+
+            IsInitialized = true;
+        }
+
+        public void Initialize(byte[] sessionKey, byte[] serverSeed, byte[] clientSeed)
+        {
+            IsInitialized = false;
+
+            if (IsInitialized)
+                throw new InvalidOperationException("PacketCrypt already initialized!");
+
+            SARC4Encrypt = new SARC4();
+            SARC4Decrypt = new SARC4();
+
+            var encryptSHA1 = new HMACSHA1(serverSeed);
+            var decryptSHA1 = new HMACSHA1(clientSeed);
+
+            SARC4Encrypt.PrepareKey(encryptSHA1.ComputeHash(sessionKey));
+            SARC4Decrypt.PrepareKey(decryptSHA1.ComputeHash(sessionKey));
+
+            var PacketEncryptionDummy = new byte[0x400];
+            var PacketDecryptionDummy = new byte[0x400];
+
+            SARC4Encrypt.ProcessBuffer(PacketEncryptionDummy, PacketEncryptionDummy.Length);
+            SARC4Decrypt.ProcessBuffer(PacketDecryptionDummy, PacketDecryptionDummy.Length);
+
+            IsInitialized = true;
+        }
+
+        public void Encrypt(byte[] data, int count)
+        {
+            if (!IsInitialized)
+                throw new InvalidOperationException("PacketCrypt not initialized!");
+
+            SARC4Encrypt.ProcessBuffer(data, count);
+        }
+
+        public void Decrypt(byte[] data, int count)
+        {
+            if (!IsInitialized)
+                throw new InvalidOperationException("PacketCrypt not initialized!");
+
+            SARC4Decrypt.ProcessBuffer(data, count);
+        }
+
+        public void Dispose()
+        {
+            IsInitialized = false;
+        }
+
+        public bool IsInitialized { get; set; }
+        SARC4 SARC4Encrypt;
+        SARC4 SARC4Decrypt;
+    }
+}