sashok63's FirstCrack

Author:
sashok63

Language:
C/C++

Upload:
2024-04-13 07:57

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Platform:
Unix/linux etc.

Difficulty:
2.3

Quality:
4.0

Arch:
x86-64

Downloads:
213

Size:
16.00 KB

Writeups:
1

Comments:
8

Description

This is my first crackme, I hope it wasn't too easy and interesting)))

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Comments (8)
Writeups (1)

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femega on 2024-04-16 11:45: Wow. An amazing crackme by sashahuy. Thanks!

Emanon on 2024-04-16 22:39: I "solved it" but am ways from fully understanding it.

mikky on 2024-04-18 16:29: [Click to reveal]

OpaxIV on 2024-04-19 17:20: Can someone give me a hint? I am currently at fun3() and just don't understand what is going on in the CONCAT function. I know some C, Python, Java so it is more about the overall logic. thanks in advance

OpaxIV on 2024-04-19 17:22: * for context, this is the part I mean: ``` local_10 = *(long *)(in_FS_OFFSET + 0x28); local_48 = (ulong)CONCAT14(input_string[1] == **(char **)(param_3 + 0x30), (uint)(*input_string == **(char **)(param_2 + 0x10))); local_40 = (ulong)CONCAT14(input_string[3] == **(char **)(param_5 + 0x20), (uint)(input_string[2] == **(char **)(param_4 + 0x10))); local_38 = (ulong)CONCAT14(input_string[5] == **(char **)(param_7 + 8), (uint)(input_string[4] == **(char **)(param_6 + 0x30))); local_30 = (ulong)CONCAT14(input_string[7] == **(char **)(param_9 + 0x20), (uint)(input_string[6] == **(char **)(param_8 + 0x38))); local_28 = (ulong)CONCAT14(input_string[9] == **(char **)(param_11 + 0x28), (uint)(input_string[8] == **(char **)(param_10 + 0x18))); local_20 = (ulong)CONCAT14(input_string[0xb] == **(char **)(param_13 + 0x38), (uint)(input_string[10] == **(char **)(param_12 + 0x10))); ```

OpaxIV on 2024-04-19 18:44: Managed to do it. Please ignore my comments.

cnathansmith on 2024-05-11 08:23: @OpaxIV It's (confusing) shorthand for concatenation, so CONCAT31 concatenates 3 bytes from the first argument with one byte from the second. CONCAT31(0xaabbcc,0xdd) = 0xaabbccdd

RafaelGFreveng on 2024-10-20 17:55: cracked. sha 1 $4$v7OyMXsV$ObymHUfAkrOSGt8B+bHq3UQOUF4$

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Solution by Akimi on 2024-05-04 07:24:

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sashok63's FirstCrack