/// <summary>
/// Reads and checks the anti-tamper hash code from given stream.
/// </summary>
/// <typeparam name="T">The type of the value.</typeparam>
/// <param name="s">The stream.</param>
/// <param name="v">The value.</param>
public static void ReadAntiTamperHashCode <T>(Stream s, T v)
where T : class, IObjectWithHashCode64
{
LongToBytesConverter c;
try
{
c = new LongToBytesConverter
{
Byte1 = (byte)s.ReadByte(),
Byte2 = (byte)s.ReadByte(),
Byte3 = (byte)s.ReadByte(),
Byte4 = (byte)s.ReadByte(),
Byte5 = (byte)s.ReadByte(),
Byte6 = (byte)s.ReadByte(),
Byte7 = (byte)s.ReadByte(),
Byte8 = (byte)s.ReadByte()
};
}
catch (Exception ex)
{
// Probably, the hash was missing at all.
throw new InvalidDataException(ErrorMessages.HashNotFound, ex);
}
// Value is valid if hashes match.
if (c.Long != v.GetHashCode64())
{
throw new InvalidDataException(string.Format(ErrorMessages.HashMismatch, v.GetHashCode64(), c.Long));
}
}
/// <summary>
/// Writes an anti-tamper hash code into given stream.
/// </summary>
/// <typeparam name="T">The type of the value.</typeparam>
/// <param name="s">The stream.</param>
/// <param name="v">The value.</param>
public static void WriteAntiTamperHashCode <T>(Stream s, T v)
where T : class, IObjectWithHashCode64
{
var c = new LongToBytesConverter {
Long = v.GetHashCode64()
};
s.WriteByte(c.Byte1);
s.WriteByte(c.Byte2);
s.WriteByte(c.Byte3);
s.WriteByte(c.Byte4);
s.WriteByte(c.Byte5);
s.WriteByte(c.Byte6);
s.WriteByte(c.Byte7);
s.WriteByte(c.Byte8);
}
