C# MD5

推荐使用：

md5

MD5 md5Hasher = MD5.Create();
            byte[] data = md5Hasher.ComputeHash(Encoding.Default.GetBytes("myTest+123"));
            StringBuilder sBuilder = new StringBuilder();

            for (int i = 0; i < data.Length; i++)
            {
                sBuilder.Append(data[i].ToString("x2"));
            }

            Console.WriteLine(sBuilder);

md5+base64:

MD5 md5Hasher = MD5.Create();
string strMD5 = Convert.ToBase64String(md5Hasher.ComputeHash(Encoding.UTF8.GetBytes(str)));

不推荐：

System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToUpper();

因为我有一次和java接口对接时，

发现不推荐的md5和人家出来的结果不一样