C# md5 16位 32位

using System.Security.Cryptography;

// 32 位
public String md5(String s)
{
    MD5 md5 = new MD5CryptoServiceProvider();
    byte[] bytes = System .Text .Encoding .UTF8 .GetBytes(s);
    bytes = md5 .ComputeHash(bytes);
    md5 .Clear();

    string ret = "";
    for (int i=0 ; i<bytes .Length ; i++)
    {
        ret += Convert .ToString(bytes[i] , 16) .PadLeft(2 , '0');
    }

    return ret .PadLeft(32 , '0');
}


// 16 位
public string GetMd5Str(string ConvertString)
{
    MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
    string t2 = BitConverter .ToString(md5 .ComputeHash(UTF8Encoding .Default .GetBytes(ConvertString)) , 4 , 8);
    t2 = t2 .Replace("-" , "");
    return t2;
}