System.Security.Cryptography.SymmetricAlgorithm.ValidKeySize C# (CSharp) Method

        public bool ValidKeySize(int bitLength)
        {
            KeySizes[] validSizes = this.LegalKeySizes;
            if (validSizes == null)
                return false;
            return bitLength.IsLegalSize(validSizes);
        }

        public static SymmetricAlgorithm InitSymmetric(SymmetricAlgorithm algorithm, string password, int key_bit_length)
        {
            var salt = new byte[] { 1, 2, 23, 234, 37, 48, 134, 63, 248, 4 };

            const int iterations = 234;
            using (var rfc2898_derive_bytes = new Rfc2898DeriveBytes(password, salt, iterations))
            {
                if (!algorithm.ValidKeySize(key_bit_length))
                    throw new InvalidOperationException("Invalid size key");

                algorithm.Key = rfc2898_derive_bytes.GetBytes(key_bit_length / 8);
                algorithm.IV = rfc2898_derive_bytes.GetBytes(algorithm.BlockSize / 8);
                return algorithm;
            }
        }