private byte[] GenerateSequence()
{
// Generate between 0 and maxLen random bytes to be used as padding
byte[] padding = provider.GetBytes(provider.NextUShort((ushort)(maxLen + 1)));
// Remove instances of the delimiter sequence from the padding
int idx;
while ((idx = Support.ArrayContains(padding, delimiter)) != -1)
{
foreach (byte val in provider.GetBytes(delimiter.Length))
{
padding[idx++] = val;
}
}
return(padding);
}
public byte[] Unpad(byte[] message)
{
int index = Support.ArrayContains(message, delimiter);
if (index == -1)
{
throw new InvalidPaddingException("Preceding delimiter could not be found");
}
byte[] result_stage1 = new byte[message.Length - 1 - index];
Array.Copy(message, index + 1, result_stage1, 0, message.Length - 1 - index);
index = Support.ArrayContains(result_stage1, delimiter, false);
if (index == -1)
{
throw new InvalidPaddingException("Trailing delimeter could not be found");
}
byte[] result_stage2 = new byte[index];
Array.Copy(result_stage1, 0, result_stage2, 0, index);
return(result_stage2);
}
