using System;

using System.Linq;

​

var projectId = Guid.Parse("4C0694B3-9F9F-4CC4-8F90-CC8189364AEA");

var designId = Guid.Parse("85921F2B-8485-469B-BCA7-92B6480A3F16");

var versionId = Guid.Parse("C6EE47AB-8744-4F3B-A65E-D8FA25EF0CB9");

​

var importKey = "tAHFvBCACDBIEwIAIrBIBHrBEvvsEBIJABGBstJBwCCvBECwAJuvABGrsAGrAABrrHFItvrwuHGCFECJrssGCvsHErHuEIurA";

var unshiftedKey = $"{versionId}{(int)0}{designId}{projectId}".Replace("-", "");

var shiftedKey = ShiftAscii(importKey.ToArray(), -17);

​

Console.WriteLine(shiftedKey);

​

string ShiftAscii(char[] buffer, int shift)

{

    for (var i = 0; i < buffer.Length; i++)

    {

        var shifted = Convert.ToInt32(buffer[i]) + shift;

​

        if (shifted > char.MaxValue)

        {

            shifted -= char.MaxValue;

        }

        else if (shifted < char.MinValue)

        {

            shifted += char.MinValue;

        }

​

        buffer[i] = Convert.ToChar(shifted);

    }

​

    return new string(buffer);

}