Blake2Sharp.Blake2IvBuilder.ConfigB C# (CSharp) Method

        public static ulong[] ConfigB(Blake2BConfig config, Blake2BTreeConfig treeConfig)
        {
            bool isSequential = treeConfig == null;
            if (isSequential)
                treeConfig = SequentialTreeConfig;
            var rawConfig = new ulong[8];
            var result = new ulong[8];

            //digest length
            if (config.OutputSizeInBytes <= 0 | config.OutputSizeInBytes > 64)
                throw new ArgumentOutOfRangeException("config.OutputSize");
            rawConfig[0] |= (ulong)(uint)config.OutputSizeInBytes;

            //Key length
            if (config.Key != null)
            {
                if (config.Key.Length > 64)
                    throw new ArgumentException("config.Key", "Key too long");
                rawConfig[0] |= (ulong)((uint)config.Key.Length << 8);
            }
            // FanOut
            rawConfig[0] |= (uint)treeConfig.FanOut << 16;
            // Depth
            rawConfig[0] |= (uint)treeConfig.MaxHeight << 24;
            // Leaf length
            rawConfig[0] |= ((ulong)(uint)treeConfig.LeafSize) << 32;
            // Inner length
            if (!isSequential && (treeConfig.IntermediateHashSize <= 0 || treeConfig.IntermediateHashSize > 64))
                throw new ArgumentOutOfRangeException("treeConfig.TreeIntermediateHashSize");
            rawConfig[2] |= (uint)treeConfig.IntermediateHashSize << 8;
            // Salt
            if (config.Salt != null)
            {
                if (config.Salt.Length != 16)
                    throw new ArgumentException("config.Salt has invalid length");
                rawConfig[4] = Blake2BCore.BytesToUInt64(config.Salt, 0);
                rawConfig[5] = Blake2BCore.BytesToUInt64(config.Salt, 8);
            }
            // Personalization
            if (config.Personalization != null)
            {
                if (config.Personalization.Length != 16)
                    throw new ArgumentException("config.Personalization has invalid length");
                rawConfig[6] = Blake2BCore.BytesToUInt64(config.Personalization, 0);
                rawConfig[7] = Blake2BCore.BytesToUInt64(config.Personalization, 8);
            }

            return rawConfig;
        }

 public Blake2BHasher(Blake2BConfig config)
 {
     if (config == null)
     {
         config = DefaultConfig;
     }
     rawConfig = Blake2IvBuilder.ConfigB(config, null);
     if (config.Key != null && config.Key.Length != 0)
     {
         key = new byte[128];
         Array.Copy(config.Key, key, config.Key.Length);
     }
     outputSizeInBytes = config.OutputSizeInBytes;
     Init();
 }