/// <summary>
/// Первоначальная установка состояния шифра.
/// </summary>
/// <param name="iv">Синхропосылка.</param>
/// <param name="subKeys">Подключи.</param>
public void SetIV(byte[] iv, List <uint> subKeys)
{
byte[] encodedIV = substitution.EncodeProcess(iv, subKeys);
n3 = BitConverter.ToUInt32(encodedIV, 0);
n4 = BitConverter.ToUInt32(encodedIV, 4);
}
/// <summary>
/// CFB encode.
/// </summary>
/// <param name="data">Opened message.</param>
/// <param name="subKeys">Subkeys.</param>
/// <returns>Encoded message.</returns>
public byte[] EncodeProcess(byte[] data, List <uint> subKeys)
{
byte[] gamma = new byte[8];
Array.Copy(BitConverter.GetBytes(n1), 0, gamma, 0, 4);
Array.Copy(BitConverter.GetBytes(n2), 0, gamma, 4, 4);
gamma = substitution.EncodeProcess(gamma, subKeys);
byte[] res = XOR(gamma, data);
if (res.Length == 8)
{
n1 = BitConverter.ToUInt32(res, 0);
n2 = BitConverter.ToUInt32(res, 4);
}
return(res);
}
