/// <summary>Reads a short value from the stream</summary>
/// <returns>A short value</returns>
public ushort ReadShort()
{
byte[] shortArray = new byte[2];
this.Read(shortArray, 0, 2);
return(Converters.BigEndianToUInt16(shortArray));
}
/// <summary>Reads a long value from the stream</summary>
/// <returns>A long value</returns>
public ulong ReadLong()
{
byte[] longArray = new byte[8];
this.Read(longArray, 0, 8);
return(Converters.BigEndianToUInt64(longArray));
}
/// <summary>Reads an int value from the stream</summary>
/// <returns>A int value</returns>
public uint ReadInt()
{
byte[] intArray = new byte[4];
this.Read(intArray, 0, 4);
return(Converters.BigEndianToUInt32(intArray));
}
/// <summary>Encrypts password using IBM's flavor of DES algorithm as defined in RFC2877</summary>
/// <param name="userName">User name in ASCII</param>
/// <param name="password">Password in ASCII</param>
/// <param name="serverSeed">Server's seed</param>
/// <param name="clientSeed">Client's seed</param>
/// <returns>Encrypted password as EBCDIC byte stream</returns>
public static byte[] EncryptPasswordDES(string userName, string password, ulong serverSeed, ulong clientSeed)
{
byte[] passwordToken = new byte[8];
if (password.Length > 8)
{
byte[] passwordTokenA = GenerateToken(userName, password.Substring(0, 8));
byte[] passwordTokenB = GenerateToken(userName, password.Substring(8));
passwordToken = Converters.UInt64ToBigEndian(Converters.BigEndianToUInt64(passwordTokenA) ^ Converters.BigEndianToUInt64(passwordTokenB));
}
else
{
passwordToken = GenerateToken(userName, password);
}
byte[] usernameEBCDIC_A;
byte[] usernameEBCDIC_B;
if (userName.Length <= 8)
{
usernameEBCDIC_A = Converters.AsciiToEbcdic(userName.ToUpper().PadRight(8));
usernameEBCDIC_B = Converters.UInt64ToBigEndian(0x4040404040404040);
}
else
{
usernameEBCDIC_A = Converters.AsciiToEbcdic(userName.Substring(0, 8).ToUpper().PadRight(8));
usernameEBCDIC_B = Converters.AsciiToEbcdic(userName.Substring(8).ToUpper().PadRight(8));
}
byte[] firstEncryptionRound = EncryptDES(Converters.UInt64ToBigEndian(serverSeed + 1), passwordToken);
byte[] secondEncryptionRound = EncryptDES(Converters.UInt64ToBigEndian(Converters.BigEndianToUInt64(firstEncryptionRound) ^ clientSeed), passwordToken);
byte[] thirdEncryptionRound = EncryptDES(Converters.UInt64ToBigEndian(Converters.BigEndianToUInt64(usernameEBCDIC_A) ^ (serverSeed + 1) ^ Converters.BigEndianToUInt64(secondEncryptionRound)), passwordToken);
byte[] fourthEncryptionRound = EncryptDES(Converters.UInt64ToBigEndian(Converters.BigEndianToUInt64(usernameEBCDIC_B) ^ (serverSeed + 1) ^ Converters.BigEndianToUInt64(thirdEncryptionRound)), passwordToken);
return(EncryptDES(Converters.UInt64ToBigEndian(Converters.BigEndianToUInt64(fourthEncryptionRound) ^ 0x0000000000000001), passwordToken));
}