Convert a hex string into a byte array with one byte for every 2 hex characters.

 
//Hex bytes may be seperated by 0 or more whitespace characters.


using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;


internal static class Util
{

    internal static byte[] HexStringToBytes(string input)
    {
        if (input == null)
            return null;

        List<byte> bytes = new List<byte>();

        foreach (string hexSubstring in input.Split(' ', '\t', '\n'))
        {
            Debug.Assert(hexSubstring.Length % 2 == 0, "hexSubstring.Length % 2 == 0");

            for (int i = 0; i < hexSubstring.Length; i += 2)
            {
                bytes.Add(Byte.Parse(hexSubstring.Substring(i, 2), NumberStyles.HexNumber));
            }
        }

        return bytes.ToArray();
    }
}

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Convert a hex string into a byte array with one byte for every 2 hex characters. : HEX « Data Types « C# / C Sharp

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