byte[] createRawData(string s)
{
MemoryStream ms = new MemoryStream();
byte[] pad = null;
if (PadSettings.HasValue)
{
byte[] h = null;
PadHeader ph = new PadHeader();
pad = CreatePad(ref h, ref ph);
if (h != null)
{
ms.WriteAll(h);
}
if (ph.Location == PadLocation.Start)
{
ms.WriteAll(pad);
pad = null;
}
}
ms.WriteAll(s.EncodeToByteArray(Encoding.UTF8));
if (pad != null)
{
ms.WriteAll(pad);
}
return(ms.ToFinalArray());
}
public void FromPadHeader(PadHeader ph, byte[] seq)
{
size = ph.size;
location = ph.Location;
type = ph.Type;
_t_fc_char = ph.fc_char;
_t_fc_seq = (seq != null && seq.Length > 0)?seq:null;
}
private string stripPadding(byte[] raw, out PadSettings?ps)
{
MemoryStream ms = new MemoryStream(raw);
ms.Position = 0;
if (ms.ReadValue <uint>() == PadHeader.PAD_ENABLED_MAGIC)
{
PadHeader ph = ms.ReadValue <PadHeader>();
byte[] seq = new byte[ph.fc_seq_size];
ms.ReadAll(seq);
var _ps = new PadSettings();
_ps.FromPadHeader(ph, seq);
ps = _ps;
if (ph.Location == PadLocation.Start)
{
ms.Position += ph.size;
using (var ms2 = new MemoryStream())
{
ms.CopyTo(ms2);
ms.Close();
return(ms2.ToArray().DecodeToString(Encoding.UTF8));
}
}
else
{
using (var ms2 = new MemoryStream())
{
ms.CopyTo(ms2);
ms.Close();
byte[] ar = ms2.ToArray();
return(ar.SubArray(0, ar.Length - ph.size).DecodeToString(Encoding.UTF8));
}
}
}
else
{
ms.Close();
ps = null;
return(raw.DecodeToString(Encoding.UTF8));
}
}
public PadHeader CreatePadHeader(RNGCryptoServiceProvider rng, ref byte[] seq)
{
PadHeader ph = new PadHeader();
Random r = pad_rng(rng);
ph.size = size ?? r.Next(global::et.PadSettings.RANDOM_SIZE_BOUND_LOW, global::et.PadSettings.RANDOM_SIZE_BOUND_HIGH);
ph.Location = location ?? (PadLocation)r.Next(0, 1);
ph.fc_char = type == null ? (char)r.Next(0, 255) : _t_fc_char;
seq = type == null?pad_rng_seq(rng, r) : _t_fc_seq;
if (seq == null)
{
ph.fc_seq_size = 0;
}
else
{
ph.fc_seq_size = seq.Length;
}
ph.Type = type ?? (PadType)(r.Next(0, 3));
return(ph);
}
public byte[] CreatePad(ref byte[] padHeaderFull, ref PadHeader ph)
{
if (PadSettings == null)
{
return(null);
}
else
{
var ps = PadSettings.Value;
byte[] seq = null;
ph = ps.CreatePadHeader(rng, ref seq);
if (seq != null)
{
padHeaderFull = global::et.PadHeader.PAD_ENABLED_MAGIC.ToByteArray().Concat(ph.ToByteArray().Concat(seq)).ToArray();
}
else
{
padHeaderFull = global::et.PadHeader.PAD_ENABLED_MAGIC.ToByteArray().Concat(ph.ToByteArray()).ToArray();
}
MemoryStream actualPad = new MemoryStream();
switch (ph.Type)
{
case PadType.Zero: actualPad.WriteAll(new byte[ph.size]); break;
case PadType.Random:
{
byte[] v = new byte[ph.size];
rng.GetBytes(v);
actualPad.WriteAll(v);
} break;
case PadType.FixedC:
{
for (int i = 0; i < ph.size; i++)
{
actualPad.WriteByte((byte)ph.fc_char);
}
} break;
case PadType.FixedS:
{
for (int i = 0, j = 0; i < ph.size; i++)
{
if (j >= seq.Length)
{
j = 0;
}
actualPad.WriteByte(seq[j]);
j += 1;
}
} break;
}
return(actualPad.ToFinalArray());
/*
* var ps = PadSettings.Value;
* MemoryStream ms = new MemoryStream();
* ms.WriteValue<uint>(PadHeader.PAD_ENABLED_MAGIC);
* ph = new PadHeader();
* ph.size = ps.size ?? r.Next(global::et.PadSettings.RANDOM_SIZE_BOUND_LOW, global::et.PadSettings.RANDOM_SIZE_BOUND_HIGH);
* ph.Location = ps.location?? (PadLocation) r.Next(0, 1);
* header = ms.ToFinalArray();
*
* var type = ps.type ?? (PadType)(r.Next(0, 3));
* MemoryStream actualPad = new MemoryStream();
* switch (type)
* {
* case PadType.Zero: ms.WriteAll(new byte[ph.size]); break;
* case PadType.Random:
* {
* byte[] v = new byte[ph.size];
* rng.GetBytes(v);
* actualPad.WriteAll(v);
* } break;
* case PadType.FixedC:
* {
* char c = ps.type == null ? (char)r.Next(0, 255) : ps._t_fc_char;
* for (int i = 0; i < ph.size; i++) actualPad.WriteByte((byte)c);
* } break;
* case PadType.FixedS:
* {
* byte[] seq = ps.type == null ? pad_rng_seq(r) : ps._t_fc_seq;
* for (int i = 0, j = 0; i < ph.size; i++)
* {
* if (j >= seq.Length) j = 0;
* actualPad.WriteByte(seq[j]);
* j += 1;
* }
* } break;
* }
* return actualPad.ToFinalArray();*/
}
}
