I'm trying to bypass (crack) a very old software that require license in order to unlock all the features

i was digging in the lines with a little bit of knowledge in assembly and i found the line where it compare the hash of the request code with the hash of the license i entered

this is the line ( not %100 sure ) enter image description here

arrow1 where the random request code generated and the entered license saved to a param (not sure)

arrow2 where the compare happen ( same not sure)

The software compare a hash with the hash of the key code you entered, if it's the same, it will work

a random license request code generated everytime you run the .exe

using GenerateRandomNumber

enter image description here

and hashed by using HkdfHashAlgorithm

enter image description here

my question is

when i change je 0x7C1AEF1F to jne 0x7C1AEF1F

enter image description here

the software stopped working and when i execute it i got the command prompt for 1second and disappear

enter image description here

so what i need to change in order to compare the hash of the request code with the same hash or to say if not equal so activated...

Appreciate any help

1 Answer 1


Algorithm: ((Licence request code) + 0x26946948) ^ (your serial number of C: volume or 0xffffffff if failed).

  • This keygen I'm written in golang.

  • Or javascript keygen function keygen(code, serial) { code = parseInt(/([0-9-]{12})/.exec(code)[0].replace(/-/g, '')) return ((code + 0x26946948) ^ parseInt(serial.replace(/-/g, ''), 16)) >>> 0 } // example // '9950-7444-3132-b9' is Licence request code // 'A639-6EDE' is Volume Serial Number of C: keygen('9950-7444-3132-b9', 'A639-6EDE')


  • Or modify assembly at file.exe+178A je file.exe+17B4 -> jne file.exe+17B4 to bypass.
  • Thank you for your answer, please how can i use that keygen? and where i find SpoolManager.exe+17B4 ?
    – JDEV
    Dec 20, 2019 at 4:59
  • @JDEV, see my edit to usage javascript keygen :D
    – xax
    Dec 20, 2019 at 5:06
  • Man, i don't know how you did it, it's working, i really don't understand how you figure it out, please if you have time, explain it, i'm very interested / i spent more than 10 hours digging in assembly lines without success, for me your code looks like a magic, haha, Thank you very much i really appreciate it
    – JDEV
    Dec 20, 2019 at 5:29
  • How can i find SpoolManager.exe+17B4 in x64dbg please ?
    – JDEV
    Dec 20, 2019 at 10:07
  • I'm using Cheat Engine to debug this program, SpoolManager.exe+17B4 = 00400000 + 17B4 = 004017B4
    – xax
    Dec 20, 2019 at 11:37

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