using System;

using System.Security.Cryptography; 

using System.Text;

​

public class Program

{

    public static void Main()

    {

        var alias = "{_appName}_{context.CorpID}_{context.UserId}";

        var hashGen = RIPEMD160Managed.Create();

        var aliasHashBytes = hashGen.ComputeHash(Encoding.UTF8.GetBytes(alias));

        var res = Convert.ToBase64String(aliasHashBytes).Trim().ToLower();

        Console.WriteLine("alias: " + res.ToString());

    }

}