private bool isValidAlgorithm(string algorithm)
        {
            SymmetricBlockAlgorithm symmetricBlockAlgorithm = SymmetricBlockAlgorithmUtils.getSymmetricBlockAlgorithm(algorithm,
                                                                                                                      this.error);
            int blockSize = SymmetricBlockAlgorithmUtils.getBlockSize(symmetricBlockAlgorithm, this.error);

            if (this.HasError())
            {
                return(false);
            }
            if (blockSize != 64 && blockSize != 128)
            {
                return(false);
            }

            return(true);
        }
        /// <summary>
        /// Build the engine
        /// </summary>
        /// <param name="algorithm">SymmetricBlockAlgorithm enum, algorithm name</param>
        /// <returns>IBlockCipher with the algorithm Engine</returns>
        internal IBlockCipher getCipherEngine(SymmetricBlockAlgorithm algorithm)
        {
            IBlockCipher engine = null;

            switch (algorithm)
            {
            case SymmetricBlockAlgorithm.AES:
                engine = new AesEngine();
                break;

            case SymmetricBlockAlgorithm.BLOWFISH:
                engine = new BlowfishEngine();
                break;

            case SymmetricBlockAlgorithm.CAMELLIA:
                engine = new CamelliaEngine();
                break;

            case SymmetricBlockAlgorithm.CAST5:
                engine = new Cast5Engine();
                break;

            case SymmetricBlockAlgorithm.CAST6:
                engine = new Cast6Engine();
                break;

            case SymmetricBlockAlgorithm.DES:
                engine = new DesEngine();
                break;

            case SymmetricBlockAlgorithm.TRIPLEDES:
                engine = new DesEdeEngine();
                break;

            case SymmetricBlockAlgorithm.DSTU7624_128:
                engine = new Dstu7624Engine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.DSTU7624_128, this.error));
                break;

            case SymmetricBlockAlgorithm.DSTU7624_256:
                engine = new Dstu7624Engine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.DSTU7624_256, this.error));
                break;

            case SymmetricBlockAlgorithm.DSTU7624_512:
                engine = new Dstu7624Engine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.DSTU7624_512, this.error));
                break;

            case SymmetricBlockAlgorithm.GOST28147:
                engine = new Gost28147Engine();
                break;

            case SymmetricBlockAlgorithm.NOEKEON:
                engine = new NoekeonEngine();
                break;

            case SymmetricBlockAlgorithm.RC2:
                engine = new RC2Engine();
                break;

            case SymmetricBlockAlgorithm.RC532:
                engine = new RC532Engine();
                break;

            case SymmetricBlockAlgorithm.RC564:
                engine = new RC564Engine();
                break;

            case SymmetricBlockAlgorithm.RC6:
                engine = new RC6Engine();
                break;

            case SymmetricBlockAlgorithm.RIJNDAEL_128:
                engine = new RijndaelEngine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.RIJNDAEL_128, this.error));
                break;

            case SymmetricBlockAlgorithm.RIJNDAEL_160:
                engine = new RijndaelEngine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.RIJNDAEL_160, this.error));
                break;

            case SymmetricBlockAlgorithm.RIJNDAEL_192:
                engine = new RijndaelEngine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.RIJNDAEL_192, this.error));
                break;

            case SymmetricBlockAlgorithm.RIJNDAEL_224:
                engine = new RijndaelEngine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.RIJNDAEL_224, this.error));
                break;

            case SymmetricBlockAlgorithm.RIJNDAEL_256:
                engine = new RijndaelEngine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.RIJNDAEL_256, this.error));
                break;

            case SymmetricBlockAlgorithm.SEED:
                engine = new SeedEngine();
                break;

            case SymmetricBlockAlgorithm.SERPENT:
                engine = new SerpentEngine();
                break;

            case SymmetricBlockAlgorithm.SKIPJACK:
                engine = new SkipjackEngine();
                break;

            case SymmetricBlockAlgorithm.SM4:
                engine = new SM4Engine();
                break;

            case SymmetricBlockAlgorithm.TEA:
                engine = new TeaEngine();
                break;

            case SymmetricBlockAlgorithm.THREEFISH_256:
                engine = new ThreefishEngine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.THREEFISH_256, this.error));
                break;

            case SymmetricBlockAlgorithm.THREEFISH_512:
                engine = new ThreefishEngine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.THREEFISH_512, this.error));
                break;

            case SymmetricBlockAlgorithm.THREEFISH_1024:
                engine = new ThreefishEngine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.THREEFISH_1024, this.error));
                break;

            case SymmetricBlockAlgorithm.TWOFISH:
                engine = new TwofishEngine();
                break;

            case SymmetricBlockAlgorithm.XTEA:
                engine = new XteaEngine();
                break;

            default:
                this.error.setError("SB020", "Cipher " + algorithm + " not recognised.");
                break;
            }
            return(engine);
        }