/// <summary>
/// Converts a password into mail information.
/// </summary>
/// <param name="password">The password to convert.</param>
/// <returns>Mail information from the password.</returns>
public static WonderSMail Convert(string password)
{
if (string.IsNullOrEmpty(password))
{
throw new ArgumentNullException(nameof(password));
}
// Sanitaze and check password
password = password.Replace(" ", "");
password = password.Replace("\t", "");
password = password.Replace(Environment.NewLine, "");
password = password.ToUpper();
if (password.Length != PasswordLength)
{
throw new ArgumentException("Invalid password length");
}
// Do decryption rounds
// The last byte for "scramble" is ignored. It should be the null
// terminator 0x00.
password = Permutation.Decrypt(password, false);
byte[] binary = Substitution.Decrypt(password);
Scramble.Decrypt(binary[0], binary, 4, binary.Length - 5);
// Validate checksum
uint crc32 = BitConverter.ToUInt32(binary, 0);
uint newCrc32 = Crc32.Calculate(binary, 4, binary.Length - 5);
if (crc32 != newCrc32)
{
throw new FormatException("Invalid crc32");
}
// Convert the binary password into the structure.
// Write the array into a stream to use the BitReader.
DataStream stream = new DataStream();
stream.Write(binary, 4, binary.Length - 4);
BitReader reader = new BitReader(stream);
WonderSMail info = new WonderSMail();
info.MailType = reader.ReadByte(4);
info.MissionType = reader.ReadByte(4);
info.MissionSubType = reader.ReadByte(4);
info.SourceClientId = reader.ReadUInt16(11);
info.TargetClientId = reader.ReadUInt16(11);
info.TargetClientFemale = reader.ReadUInt16(11);
info.RewardObjectId = reader.ReadUInt16(10);
info.RewardType = reader.ReadByte(4);
info.RewardId = reader.ReadUInt16(11);
info.RestrictionType = reader.ReadByte(1);
info.RestrictionParam = reader.ReadUInt16(11);
info.Random = reader.ReadUInt32(24);
info.LocationId = reader.ReadByte(8);
info.FloorNumber = reader.ReadByte(8);
info.Requirement = reader.ReadByte(8);
return(info);
}
/// <summary>
/// Converts a missiong information into a password.
/// </summary>
/// <param name="info">Mission to convert.</param>
/// <returns>The password.</returns>
public static string Convert(WonderSMail info)
{
if (info == null)
{
throw new ArgumentNullException(nameof(info));
}
// Serialize the structure into a bit stream
DataStream stream = new DataStream();
BitWriter writer = new BitWriter(stream);
writer.Write(info.MailType, 4);
writer.Write(info.MissionType, 4);
writer.Write(info.MissionSubType, 4);
writer.Write(info.SourceClientId, 11);
writer.Write(info.TargetClientId, 11);
writer.Write(info.TargetClientFemale, 11);
writer.Write(info.RewardObjectId, 10);
writer.Write(info.RewardType, 4);
writer.Write(info.RewardId, 11);
writer.Write(info.RestrictionType, 1);
writer.Write(info.RestrictionParam, 11);
writer.Write(info.Random, 24);
writer.Write(info.LocationId, 8);
writer.Write(info.FloorNumber, 8);
writer.Write(info.Requirement, 8);
// Write the stream into an array for the rounds.
// We allocate an extra space for the checksum (first uint)
// and the null terminator (last byte).
byte[] binary = new byte[stream.Length + 5];
stream.Position = 0;
stream.Read(binary, 4, (int)stream.Length);
// Create checksum
uint crc32 = Crc32.Calculate(binary, 4, binary.Length - 5);
byte[] crc32Bytes = BitConverter.GetBytes(crc32);
binary[0] = crc32Bytes[0];
binary[1] = crc32Bytes[1];
binary[2] = crc32Bytes[2];
binary[3] = crc32Bytes[3];
// Do encryption rounds
// The key is the checksum, we don't encrypt the null terminator.
Scramble.Encrypt(crc32Bytes[0], binary, 4, binary.Length - 5);
string password = Substitution.Encrypt(binary, PasswordLength);
password = Permutation.Encrypt(password, false);
return(password);
}
