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GeezerVison is showing github.com — Netcode.IO.NET/Netcode.IO.NET/Core/PacketIO.cs at master · RainsSoft/Netcode.IO.NET Expand file tree/ Copy pathPacketIO.csMore file actions 234 lines (197 loc) · 6.34 KB / Copy pathPacketIO.csFile metadata and controls234 lines (197 loc) · 6.34 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 using System; using NetcodeIO.NET.Utils; using NetcodeIO.NET.Utils.IO; using Org.BouncyCastle.Crypto.TlsExt; namespace NetcodeIO.NET.Internal { /// <summary> /// Helper class for reading/writing packets /// </summary> internal static class PacketIO { /// <summary> /// Read and decrypt packet data into an output buffer /// </summary> public static int ReadPacketData(NetcodePacketHeader header, ByteArrayReaderWriter stream, int length, ulong protocolID, byte[] key, byte[] outputBuffer) { byte[] encryptedBuffer = BufferPool.GetBuffer(2048); stream.ReadBytesIntoBuffer(encryptedBuffer, length); int decryptedBytes; try { decryptedBytes = DecryptPacketData(header, protocolID, encryptedBuffer, length, key, outputBuffer); } catch(Exception e) { BufferPool.ReturnBuffer(encryptedBuffer); throw e; } BufferPool.ReturnBuffer(encryptedBuffer); return decryptedBytes; } /// <summary> /// Encrypt a packet's data /// </summary> public static int EncryptPacketData(NetcodePacketHeader header, ulong protocolID, byte[] packetData, int packetDataLen, byte[] key, byte[] outBuffer) { byte[] additionalData = BufferPool.GetBuffer(Defines.NETCODE_VERSION_INFO_BYTES + 8 + 1); using (var writer = ByteArrayReaderWriter.Get(additionalData)) { writer.WriteASCII(Defines.NETCODE_VERSION_INFO_STR); writer.Write(protocolID); writer.Write(header.GetPrefixByte()); } byte[] nonce = BufferPool.GetBuffer(12); using (var writer = ByteArrayReaderWriter.Get(nonce)) { writer.Write((UInt32)0); writer.Write(header.SequenceNumber); } int ret; try { ret = AEAD_Chacha20_Poly1305.Encrypt(packetData, 0, packetDataLen, additionalData, nonce, key, outBuffer); } catch (Exception e) { BufferPool.ReturnBuffer(additionalData); BufferPool.ReturnBuffer(nonce); throw e; } BufferPool.ReturnBuffer(additionalData); BufferPool.ReturnBuffer(nonce); return ret; } /// <summary> /// Decrypt a packet's data /// </summary> public static int DecryptPacketData(NetcodePacketHeader header, ulong protocolID, byte[] packetData, int packetDataLen, byte[] key, byte[] outBuffer) { byte[] additionalData = BufferPool.GetBuffer(Defines.NETCODE_VERSION_INFO_BYTES + 8 + 1); using (var writer = ByteArrayReaderWriter.Get(additionalData)) { writer.WriteASCII(Defines.NETCODE_VERSION_INFO_STR); writer.Write(protocolID); writer.Write(header.ReadSequenceByte); } byte[] nonce = BufferPool.GetBuffer(12); using (var writer = ByteArrayReaderWriter.Get(nonce)) { writer.Write((UInt32)0); writer.Write(header.SequenceNumber); } int ret; try { ret = AEAD_Chacha20_Poly1305.Decrypt(packetData, 0, packetDataLen, additionalData, nonce, key, outBuffer); } catch(Exception e) { BufferPool.ReturnBuffer(additionalData); BufferPool.ReturnBuffer(nonce); throw e; } BufferPool.ReturnBuffer(additionalData); BufferPool.ReturnBuffer(nonce); return ret; } /// <summary> /// Encrypt a challenge token /// </summary> public static int EncryptChallengeToken(ulong sequenceNum, byte[] packetData, byte[] key, byte[] outBuffer) { byte[] additionalData = BufferPool.GetBuffer(0); byte[] nonce = BufferPool.GetBuffer(12); using (var writer = ByteArrayReaderWriter.Get(nonce)) { writer.Write((UInt32)0); writer.Write(sequenceNum); } int ret; try { ret = AEAD_Chacha20_Poly1305.Encrypt(packetData, 0, 300 - Defines.MAC_SIZE, additionalData, nonce, key, outBuffer); } catch (Exception e) { BufferPool.ReturnBuffer(additionalData); BufferPool.ReturnBuffer(nonce); throw e; } BufferPool.ReturnBuffer(additionalData); BufferPool.ReturnBuffer(nonce); return ret; } /// <summary> /// Decrypt a challenge token /// </summary> public static int DecryptChallengeToken(ulong sequenceNum, byte[] packetData, byte[] key, byte[] outBuffer) { byte[] additionalData = BufferPool.GetBuffer(0); byte[] nonce = BufferPool.GetBuffer(12); using (var writer = ByteArrayReaderWriter.Get(nonce)) { writer.Write((UInt32)0); writer.Write(sequenceNum); } int ret; try { ret = AEAD_Chacha20_Poly1305.Decrypt(packetData, 0, 300, additionalData, nonce, key, outBuffer); } catch (Exception e) { BufferPool.ReturnBuffer(additionalData); BufferPool.ReturnBuffer(nonce); throw e; } BufferPool.ReturnBuffer(additionalData); BufferPool.ReturnBuffer(nonce); return ret; } // Encrypt a private connect token public static int EncryptPrivateConnectToken(byte[] privateConnectToken, ulong protocolID, ulong expireTimestamp, ulong sequence, byte[] key, byte[] outBuffer) { int len = privateConnectToken.Length; byte[] additionalData = BufferPool.GetBuffer(Defines.NETCODE_VERSION_INFO_BYTES + 8 + 8); using (var writer = ByteArrayReaderWriter.Get(additionalData)) { writer.WriteASCII(Defines.NETCODE_VERSION_INFO_STR); writer.Write(protocolID); writer.Write(expireTimestamp); } byte[] nonce = BufferPool.GetBuffer(12); using (var writer = ByteArrayReaderWriter.Get(nonce)) { writer.Write((UInt32)0); writer.Write(sequence); } var ret = AEAD_Chacha20_Poly1305.Encrypt(privateConnectToken, 0, len - Defines.MAC_SIZE, additionalData, nonce, key, outBuffer); BufferPool.ReturnBuffer(additionalData); BufferPool.ReturnBuffer(nonce); return ret; } // Decrypt a private connect token public static int DecryptPrivateConnectToken(byte[] encryptedConnectToken, ulong protocolID, ulong expireTimestamp, ulong sequence, byte[] key, byte[] outBuffer) { int len = encryptedConnectToken.Length; byte[] additionalData = BufferPool.GetBuffer(Defines.NETCODE_VERSION_INFO_BYTES + 8 + 8); using (var writer = ByteArrayReaderWriter.Get(additionalData)) { writer.WriteASCII(Defines.NETCODE_VERSION_INFO_STR); writer.Write(protocolID); writer.Write(expireTimestamp); } byte[] nonce = BufferPool.GetBuffer(12); using (var writer = ByteArrayReaderWriter.Get(nonce)) { writer.Write((UInt32)0); writer.Write(sequence); } var ret = AEAD_Chacha20_Poly1305.Decrypt(encryptedConnectToken, 0, len, additionalData, nonce, key, outBuffer); BufferPool.ReturnBuffer(additionalData); BufferPool.ReturnBuffer(nonce); return ret; } } } |
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