Gravatar Hasher

GravatarHasher.cs

using System;
using System.Linq;
using System.Security.Cryptography;
using System.Text;

namespace Common
{
    public static class GravatarHasher
    {
        /// <summary>
        /// Create a gravatar hash (or null)
        /// SEE: https://en.gravatar.com/site/implement/hash/
        /// </summary>
        public static string GravatarHash(String email)
        {
            if (email == null)
            {
                return null;
            }

            var canonicalEmail = email.Trim().ToLower();
            var inputBytes = Encoding.ASCII.GetBytes(canonicalEmail);
            var hash = MD5.Create().ComputeHash(inputBytes);            
            return String.Join("", hash.Select(x => x.ToString("x2")));
        }
    }
}