Org.BouncyCastle.Crypto.Encodings.ISO9796d1Encoding.EncodeBlock C# (CSharp) Method

		private byte[] EncodeBlock(
			byte[]	input,
			int		inOff,
			int		inLen)
		{
			byte[]  block = new byte[(bitSize + 7) / 8];
			int     r = padBits + 1;
			int     z = inLen;
			int     t = (bitSize + 13) / 16;

			for (int i = 0; i < t; i += z)
			{
				if (i > t - z)
				{
					Array.Copy(input, inOff + inLen - (t - i),
						block, block.Length - t, t - i);
				}
				else
				{
					Array.Copy(input, inOff, block, block.Length - (i + z), z);
				}
			}

			for (int i = block.Length - 2 * t; i != block.Length; i += 2)
			{
				byte val = block[block.Length - t + i / 2];

				block[i] = (byte)((shadows[(uint) (val & 0xff) >> 4] << 4)
					| shadows[val & 0x0f]);
				block[i + 1] = val;
			}

			block[block.Length - 2 * z] ^= (byte) r;
			block[block.Length - 1] = (byte)((block[block.Length - 1] << 4) | 0x06);

			int maxBit = (8 - (bitSize - 1) % 8);
			int offSet = 0;

			if (maxBit != 8)
			{
				block[0] &= (byte) ((ushort) 0xff >> maxBit);
				block[0] |= (byte) ((ushort) 0x80 >> maxBit);
			}
			else
			{
				block[0] = 0x00;
				block[1] |= 0x80;
				offSet = 1;
			}

			return engine.ProcessBlock(block, offSet, block.Length - offSet);
		}