System.Security.Cryptography.HashAlgorithm.TransformFinalBlock C# (CSharp) Method

        public byte[] TransformFinalBlock(byte[] inputBuffer, int inputOffset, int inputCount)
        {
            ValidateTransformBlock(inputBuffer, inputOffset, inputCount);

            HashCore(inputBuffer, inputOffset, inputCount);
            HashValue = CaptureHashCodeAndReinitialize();
            byte[] outputBytes;
            if (inputCount != 0)
            {
                outputBytes = new byte[inputCount];
                Buffer.BlockCopy(inputBuffer, inputOffset, outputBytes, 0, inputCount);
            }
            else
            {
                outputBytes = Array.Empty<byte>();
            }

            // Reset the State value
            State = 0;

            return outputBytes;
        }

 protected int StartTests(HashAlgorithm hash, byte[] input, byte[] result)
 {
     try {
         byte[] ch = hash.ComputeHash(input, 0, input.Length);
         if (!ArrayEquals(ch, result))
             AddError("HB-ST1");
     } catch {
         AddError("HB-ST2");
     }
     try {
         // feed input byte-by-byte
         for(int i = 0; i < input.Length - 1; i++) {
             hash.TransformBlock(input, i, 1, input, i);
         }
         if (input.Length > 0)
             hash.TransformFinalBlock(input, input.Length - 1, 1);
         else
             hash.TransformFinalBlock(input, 0, 0);
         if (!ArrayEquals(hash.Hash, result)) {
             AddError("HB-ST3");
             Console.WriteLine(Encoding.ASCII.GetString(input));
         }
     } catch {
         AddError("HB-ST4");
     } finally {
         hash.Initialize();
     }
     return 4;
 }