AaltoTLS.RecordLayer.RecordHandler.GeneratePadding C# (CSharp) Method

        private static void GeneratePadding(CipherSuite cipherSuite, Record record)
        {
            BulkCipherAlgorithmType cipherType = cipherSuite.BulkCipherAlgorithm.Type;

            if (cipherType == BulkCipherAlgorithmType.Block) {
                int blockSize = cipherSuite.BulkCipherAlgorithm.BlockSize;

                // Add the required padding to the end of fragment if necessary,
                // minimum padding 1 bytes, the length byte of padding itself
                int paddingLength = blockSize - (record.Fragment.Length % blockSize);
                if (record.Version.HasVariablePadding) {
                    // Add 0-1 additional blocks
                    int extra = (new System.Random()).Next(2);
                    if (paddingLength + extra*blockSize < 256) {
                        paddingLength += extra*blockSize;
                    }
                }

                // Add the actual padding bytes here
                byte[] padding = new byte[paddingLength];
                if (record.Version == ProtocolVersion.SSL3_0) {
                    RNGCryptoServiceProvider rngCsp = new RNGCryptoServiceProvider();
                    rngCsp.GetBytes(padding);
                    padding[padding.Length-1] = (byte) (padding.Length-1);
                } else {
                    for (int i=1; i<=padding.Length; i++) {
                        padding[padding.Length-i] = (byte) (padding.Length-1);
                    }
                }

                byte[] fragment = new byte[record.Fragment.Length + padding.Length];
                Buffer.BlockCopy(record.Fragment, 0, fragment, 0, record.Fragment.Length);
                Buffer.BlockCopy(padding, 0, fragment, record.Fragment.Length, padding.Length);
                record.Fragment = fragment;
            }
        }