public static byte[] Extend(byte[] key, IPadding padding)
{
if (key.Length == 16 ||
key.Length == 24 ||
key.Length == 32)
{
return(key);
}
int length = 0;
if (key.Length < 16)
{
length = 16;
}
else if (key.Length < 24)
{
length = 24;
}
else if (key.Length < 32)
{
length = 32;
}
var extended = new byte[length];
Array.Copy(key, extended, key.Length);
padding.Add(extended, key.Length - 1);
return(extended);
}
protected void ReadBlock()
{
var blockIndex = 0;
while (blockIndex < Block.Length)
{
Block[blockIndex++] = (byte)Input.ReadByte();
if (Input.Position == Input.Length && blockIndex < Block.Length)
{
Padding.Add(Block, blockIndex - 1);
break;
}
}
}