toluschr on 4:46 PM 04/19/2020: I can't seem to be able to figure this one out.
I read the assembly code carefully and know the (minimum) length of the input and the value I need rax to be, but I'm unable to find out which input I need to give.
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Solution by RobertoSpartan: message to beginners: First try it yourself, it isn't that difficult.
This was a nice reverse engineering practice. There are more solutions but someone ust use his brains and read carefully the code. As long as the first and the last character of the password is right.... pass. That's all I'm gonna tell.