CASCExplorer.Salsa20.Salsa20CryptoTransform.TransformBlock C# (CSharp) Method

            public int TransformBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset)
            {
                // check arguments
                if (inputBuffer == null)
                    throw new ArgumentNullException("inputBuffer");
                if (inputOffset < 0 || inputOffset >= inputBuffer.Length)
                    throw new ArgumentOutOfRangeException("inputOffset");
                if (inputCount < 0 || inputOffset + inputCount > inputBuffer.Length)
                    throw new ArgumentOutOfRangeException("inputCount");
                if (outputBuffer == null)
                    throw new ArgumentNullException("outputBuffer");
                if (outputOffset < 0 || outputOffset + inputCount > outputBuffer.Length)
                    throw new ArgumentOutOfRangeException("outputOffset");
                if (m_state == null)
                    throw new ObjectDisposedException(GetType().Name);

                byte[] output = new byte[64];
                int bytesTransformed = 0;

                while (inputCount > 0)
                {
                    Hash(output, m_state);
                    m_state[8] = AddOne(m_state[8]);
                    if (m_state[8] == 0)
                    {
                        // NOTE: stopping at 2^70 bytes per nonce is user's responsibility
                        m_state[9] = AddOne(m_state[9]);
                    }

                    int blockSize = Math.Min(64, inputCount);
                    for (int i = 0; i < blockSize; i++)
                        outputBuffer[outputOffset + i] = (byte)(inputBuffer[inputOffset + i] ^ output[i]);
                    bytesTransformed += blockSize;

                    inputCount -= 64;
                    outputOffset += 64;
                    inputOffset += 64;
                }

                return bytesTransformed;
            }