SHA1BruteForce

brute-force attack to recover SHA-1 hashed password.

Copyright (C) 2017 Clément Février

License

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

About

This is a simple C++ software to recover a password for SHA-1 hash. It is performing a brute-force attack.
Complexity: It is a simple brute-force algorithm, so the complexity increases exponentially with the size of the password.
Multithreading: On a N_CORE computer, if SEQTIME is the maximum time when launched with one thread, then the maximum time is SEQTIME / N_TREAD when N_THREAD < N_CORE and SEQTIME / N_CORE when N_THREAD > N_CORE

Install

You need GCC < 8, Boost and Libtomcrypt for the program itself and git to download it. The restriction on GCC comes from an incompatibility between GCC 8 and Boost. On Ubuntu,

Then, you need to clone the git repository

Use

main.cpp

Modify the parameters in main.cpp.

• HASH: The SHA-1 hash. Two accepted formats:
  • Without spaces, as usually stored. You need to ensure that it is 40 character-long. Example for the password ZZZ
    116ff222a3b49b63348d7782e4b43ffe2dcbb198
  • With spaces. No restriction on the length of the string. But you need to ensure to have 20 spaced-separated hexadecimal numbers. It is the format used to display hashes in this program. Example for the password ZZZZZZ
    18 f3 f 1b a4 c6 2e 2b 46 e 69 33 6 b3 9a d e2 7d 74 7c
• MaxLength: Maximum length of the password to test.
• N_THREAD: Number of threads to launch. The program will launch at most a number of thread corresponding to the number of character to test. In other words, the length of list. In this case, it is 95.

Makefile

(Optional) Profiling

You can use the Makefile as it is, but I recommend to add the flags specific to your architecture. Also, you can profile the code with the following steps. Set the variable test in main.cpp. For example, change line 91

to Add the flag -fprofile-generate to the variable CC in the Makefile. Clean objects in case already compile before and recompile with the new flag. Execute the code to generate the profile. Modify main.cpp to reverte back test to "" otherwise the SHA-1 hash that you want to crack will be ignore. Modify the variable CC in the Makefile to substitute -fprofile-generate by -fprofile-use -fprofile-correction. Finally, clean the objects to enforce recompiling all of them using the profile

Compiling

Then compile with

or, better, for parallel compiling. Any number greater than 2 will not have effect because there is only 2 objects.

sha1

Launch it with

It will display the SHA-1 hash and the corresponding password if it find it.

Cleaning

You can safely clean the temporary objects with

You can also clean all files produced by the project to recover fresh-like folder