From 220597e65eccf116972df5e32e8d3a41675496e8 Mon Sep 17 00:00:00 2001 From: Ray Koopa Date: Fri, 4 Jan 2019 14:11:59 +0100 Subject: [PATCH] Move password encryption algorithm to separate class. --- src/Syroot.Worms/OnlineWorms/Encodings.cs | 22 ++++ src/Syroot.Worms/OnlineWorms/LaunchConfig.cs | 110 +--------------- .../OnlineWorms/PasswordCrypto.cs | 119 ++++++++++++++++++ 3 files changed, 146 insertions(+), 105 deletions(-) create mode 100644 src/Syroot.Worms/OnlineWorms/Encodings.cs create mode 100644 src/Syroot.Worms/OnlineWorms/PasswordCrypto.cs diff --git a/src/Syroot.Worms/OnlineWorms/Encodings.cs b/src/Syroot.Worms/OnlineWorms/Encodings.cs new file mode 100644 index 0000000..80120e8 --- /dev/null +++ b/src/Syroot.Worms/OnlineWorms/Encodings.cs @@ -0,0 +1,22 @@ +using System.Text; + +namespace Syroot.Worms.OnlineWorms +{ + /// + /// Represents instances of common pages. + /// + internal static class Encodings + { + // ---- FIELDS ------------------------------------------------------------------------------------------------- + + internal static readonly Encoding Win949; + + // ---- CONSTRUCTORS & DESTRUCTOR ------------------------------------------------------------------------------ + + static Encodings() + { + Encoding.RegisterProvider(CodePagesEncodingProvider.Instance); + Win949 = Encoding.GetEncoding(949); + } + } +} diff --git a/src/Syroot.Worms/OnlineWorms/LaunchConfig.cs b/src/Syroot.Worms/OnlineWorms/LaunchConfig.cs index a65ddf3..ed83cd2 100644 --- a/src/Syroot.Worms/OnlineWorms/LaunchConfig.cs +++ b/src/Syroot.Worms/OnlineWorms/LaunchConfig.cs @@ -2,7 +2,6 @@ using System.IO; using System.IO.MemoryMappedFiles; using System.Net; -using System.Text; using Syroot.BinaryData; namespace Syroot.Worms.OnlineWorms @@ -12,37 +11,13 @@ namespace Syroot.Worms.OnlineWorms /// public class LaunchConfig { - // ---- CONSTANTS ---------------------------------------------------------------------------------------------- - - private const int _bufferSize = 64 * sizeof(uint); - private const string _passwordCharacters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; - // ---- FIELDS ------------------------------------------------------------------------------------------------- - private static readonly Encoding _win949Encoding; private static readonly char[] _invalidUserNameChars = { '=', '&', ' ' }; - private static readonly byte[] _passwordDecryptShifts = new byte[] - { - 0x12, 0x1D, 0x07, 0x19, 0x0F, 0x1F, 0x16, 0x1B, 0x09, 0x1A, 0x03, 0x0D, 0x13, 0x0E, 0x14, 0x0B, - 0x05, 0x02, 0x17, 0x10, 0x0A, 0x18, 0x1C, 0x11, 0x06, 0x1E, 0x00, 0x15, 0x0C, 0x08, 0x04, 0x01 - }; - private static readonly byte[] _passwordEncryptShifts = new byte[] - { - 0x1A, 0x1F, 0x11, 0x0A, 0x1E, 0x10, 0x18, 0x02, 0x1D, 0x08, 0x14, 0x0F, 0x1C, 0x0B, 0x0D, 0x04, - 0x13, 0x17, 0x00, 0x0C, 0x0E, 0x1B, 0x06, 0x12, 0x15, 0x03, 0x09, 0x07, 0x16, 0x01, 0x19, 0x05 - }; private string _userName; private string _passwordString; - // ---- CONSTRUCTORS & DESTRUCTOR ------------------------------------------------------------------------------ - - static LaunchConfig() - { - Encoding.RegisterProvider(CodePagesEncodingProvider.Instance); - _win949Encoding = Encoding.GetEncoding(949); - } - // ---- PROPERTIES --------------------------------------------------------------------------------------------- /// @@ -59,7 +34,7 @@ namespace Syroot.Worms.OnlineWorms set { // 251 bytes is the space between "UID=" and the server IP, minus a terminating 0. - if (_win949Encoding.GetBytes(value).Length > 251) + if (Encodings.Win949.GetBytes(value).Length > 251) throw new ArgumentException("User name must not exceed 251 bytes."); if (value.IndexOfAny(_invalidUserNameChars) != -1) throw new ArgumentException("User name contains invalid characters."); @@ -79,7 +54,7 @@ namespace Syroot.Worms.OnlineWorms MemoryMappedFile mappedFile = MemoryMappedFile.CreateNew(mapName, 1266, MemoryMappedFileAccess.ReadWrite, MemoryMappedFileOptions.None, HandleInheritability.Inheritable); using (BinaryStream stream = new BinaryStream(mappedFile.CreateViewStream(), - encoding: _win949Encoding, stringCoding: StringCoding.ZeroTerminated)) + encoding: Encodings.Win949, stringCoding: StringCoding.ZeroTerminated)) { stream.Write("Online Worms Config File"); @@ -91,7 +66,7 @@ namespace Syroot.Worms.OnlineWorms stream.Position = 66; stream.Write("UID=", StringCoding.Raw); - stream.Write(_win949Encoding.GetBytes(UserName)); + stream.Write(Encodings.Win949.GetBytes(UserName)); stream.Position = 322; stream.Write(ServerEndPoint.Address.ToString()); @@ -118,7 +93,7 @@ namespace Syroot.Worms.OnlineWorms if (_passwordString == null) return null; string[] parts = _passwordString.Split(';'); - return DecryptPassword(parts[1], UInt32.Parse(parts[2])); + return PasswordCrypto.Decrypt(parts[1], UInt32.Parse(parts[2])); } /// @@ -129,82 +104,7 @@ namespace Syroot.Worms.OnlineWorms /// The key to encrypt with. public void SetPassword(string password, uint key = 1000) { - _passwordString = $";{EncryptPassword(password, key)};{key}"; - } - - // ---- METHODS (PRIVATE) -------------------------------------------------------------------------------------- - - private string EncryptPassword(string password, uint key) - { - using (MemoryStream inStream = new MemoryStream(new byte[_bufferSize])) - { - // Write input into a buffer. Required to loop over the input password end. - inStream.WriteString(password, StringCoding.ZeroTerminated, Encoding.ASCII); - inStream.Position = 0; - using (MemoryStream outStream = new MemoryStream(new byte[_bufferSize])) - { - // Encrypt the contents character by character. - while (inStream.Position < password.Length) - { - // Begin a new dword value at every 7th index. - uint dword = CryptDword(inStream.ReadUInt32() + key, true); - for (int j = 0; j < 7; j++) - { - outStream.WriteByte((byte)_passwordCharacters[(int)(dword % _passwordCharacters.Length)]); - dword /= (uint)_passwordCharacters.Length; - } - } - // Return the encrypted password as a zero-terminated ASCII string. - outStream.Position = 0; - return outStream.ReadString(StringCoding.ZeroTerminated, Encoding.ASCII); - } - } - } - - private string DecryptPassword(string encryptedPassword, uint key) - { - using (MemoryStream inStream = new MemoryStream(new byte[_bufferSize])) - { - // Write input into a buffer. Required to loop over the input password end. - inStream.WriteString(encryptedPassword, StringCoding.Raw, Encoding.ASCII); - inStream.Position = 0; - using (MemoryStream outStream = new MemoryStream(new byte[_bufferSize])) - { - // Decrypt the contents character by character. - for (int i = 0; i < encryptedPassword.Length; i += 7) - { - uint dword = 0; - for (int j = 0; j < 7; j++) - { - byte b = inStream.Read1Byte(); - uint op1 = (uint)Math.Pow(_passwordCharacters.Length, j); - uint op2 = (uint)(b < '0' || b > '9' ? b - '7' : b - '0'); - dword += op1 * op2; - } - // Finalize a new dword value at every 7th index. - outStream.WriteUInt32(CryptDword(dword, false) - key); - } - // Return the decrypted password as a zero-terminated ASCII string. - outStream.Position = 0; - return outStream.ReadString(StringCoding.ZeroTerminated, Encoding.ASCII); - } - } - } - - private uint CryptDword(uint dword, bool encrypt) - { - // Shift least to most significant bits into the resulting value by an amount stored in a one-way array. - byte[] shifts = encrypt ? _passwordEncryptShifts : _passwordDecryptShifts; - - uint result = 0; - int shiftIndex = 0; - while (dword > 0) - { - result += (dword & 1) << shifts[shiftIndex]; - shiftIndex++; - dword >>= 1; - } - return result; + _passwordString = $";{PasswordCrypto.Encrypt(password, key)};{key}"; } } } diff --git a/src/Syroot.Worms/OnlineWorms/PasswordCrypto.cs b/src/Syroot.Worms/OnlineWorms/PasswordCrypto.cs new file mode 100644 index 0000000..046a219 --- /dev/null +++ b/src/Syroot.Worms/OnlineWorms/PasswordCrypto.cs @@ -0,0 +1,119 @@ +using System; +using System.IO; +using Syroot.BinaryData; + +namespace Syroot.Worms.OnlineWorms +{ + /// + /// Represents the two-way encryption and decryption used to obfuscate passwords passed to the client. + /// + public static class PasswordCrypto + { + // ---- CONSTANTS ---------------------------------------------------------------------------------------------- + + private const int _bufferSize = 64 * sizeof(uint); + private const string _encryptCharacters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; + + // ---- FIELDS ------------------------------------------------------------------------------------------------- + + private static readonly byte[] _decryptShifts = new byte[] + { + 0x12, 0x1D, 0x07, 0x19, 0x0F, 0x1F, 0x16, 0x1B, 0x09, 0x1A, 0x03, 0x0D, 0x13, 0x0E, 0x14, 0x0B, + 0x05, 0x02, 0x17, 0x10, 0x0A, 0x18, 0x1C, 0x11, 0x06, 0x1E, 0x00, 0x15, 0x0C, 0x08, 0x04, 0x01 + }; + private static readonly byte[] _encryptShifts = new byte[] + { + 0x1A, 0x1F, 0x11, 0x0A, 0x1E, 0x10, 0x18, 0x02, 0x1D, 0x08, 0x14, 0x0F, 0x1C, 0x0B, 0x0D, 0x04, + 0x13, 0x17, 0x00, 0x0C, 0x0E, 0x1B, 0x06, 0x12, 0x15, 0x03, 0x09, 0x07, 0x16, 0x01, 0x19, 0x05 + }; + + // ---- METHODS (PUBLIC) --------------------------------------------------------------------------------------- + + /// + /// Encrypts the given with the specified . + /// + /// The text (typically the password) to encrypt. + /// The value to apply to the transformation for modified outcome. + /// The encrypted text. + public static string Encrypt(string data, uint key) + { + using (MemoryStream inStream = new MemoryStream(new byte[_bufferSize])) + { + // Write input into a buffer. Required to loop over the input password end. + inStream.WriteString(data, StringCoding.ZeroTerminated, Encodings.Win949); + inStream.Position = 0; + using (MemoryStream outStream = new MemoryStream(new byte[_bufferSize])) + { + // Encrypt the contents character by character. + while (inStream.Position < data.Length) + { + // Begin a new dword value at every 7th index. + uint dword = TransformDword(inStream.ReadUInt32() + key, true); + for (int j = 0; j < 7; j++) + { + outStream.WriteByte((byte)_encryptCharacters[(int)(dword % _encryptCharacters.Length)]); + dword /= (uint)_encryptCharacters.Length; + } + } + // Return the encrypted password as a zero-terminated ASCII string. + outStream.Position = 0; + return outStream.ReadString(StringCoding.ZeroTerminated, Encodings.Win949); + } + } + } + + /// + /// Decrypts the given with the specified . + /// + /// The text (typically the password) to decrypt. + /// The value to apply to the transformation for modified outcome. + /// The decrypted text. + public static string Decrypt(string data, uint key) + { + using (MemoryStream inStream = new MemoryStream(new byte[_bufferSize])) + { + // Write input into a buffer. Required to loop over the input password end. + inStream.WriteString(data, StringCoding.Raw, Encodings.Win949); + inStream.Position = 0; + using (MemoryStream outStream = new MemoryStream(new byte[_bufferSize])) + { + // Decrypt the contents character by character. + for (int i = 0; i < data.Length; i += 7) + { + uint dword = 0; + for (int j = 0; j < 7; j++) + { + byte b = inStream.Read1Byte(); + uint op1 = (uint)Math.Pow(_encryptCharacters.Length, j); + uint op2 = (uint)(b < '0' || b > '9' ? b - '7' : b - '0'); + dword += op1 * op2; + } + // Finalize a new dword value at every 7th index. + outStream.WriteUInt32(TransformDword(dword, false) - key); + } + // Return the decrypted password as a zero-terminated ASCII string. + outStream.Position = 0; + return outStream.ReadString(StringCoding.ZeroTerminated, Encodings.Win949); + } + } + } + + // ---- METHODS (PRIVATE) -------------------------------------------------------------------------------------- + + private static uint TransformDword(uint dword, bool encrypt) + { + // Shift least to most significant bits into the resulting value by an amount stored in a one-way array. + byte[] shifts = encrypt ? _encryptShifts : _decryptShifts; + + uint result = 0; + int shiftIndex = 0; + while (dword > 0) + { + result += (dword & 1) << shifts[shiftIndex]; + shiftIndex++; + dword >>= 1; + } + return result; + } + } +}