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Try to find the password of a file that was encrypted with the 'openssl' command.
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README.md

bruteforce-salted-openssl

The purpose of this program is to try to find the password of a file that was encrypted with the 'openssl' command (e.g.: openssl enc -aes256 -salt -in clear.file -out encrypted.file).

It can be used in two ways:

  • try all the possible passwords given a charset
  • try all the passwords in a file

There is a command line option to specify the number of threads to use.

The program should be able to use all the digests and symmetric ciphers available with the OpenSSL libraries installed on your system.

Sending a USR1 signal to a running bruteforce-salted-openssl process makes it print progress and continue.

Exhaustive mode

The program tries to decrypt the file by trying all the possible passwords. It is especially useful if you know something about the password (i.e. you forgot a part of your password but still remember most of it). Finding the password of the file without knowing anything about it would take way too much time (unless the password is really short and/or weak).

There are command line options to specify:

  • the minimum password length to try
  • the maximum password length to try
  • the beginning of the password
  • the end of the password
  • the character set to use (among the characters of the current locale)

Dictionary mode

The program tries to decrypt the file by trying all the passwords contained in a file. The file must have one password per line.

Dependencies

The program requires the OpenSSL libraries.

Compilation

If you are building from the raw sources, you must first generate the configuration script:

./autogen.sh

Then, build the program with the commands:

./configure
make

To install it on your system, use the command:

make install

Available options

  -1           Stop the program after finding the first password candidate.

  -a           List the available cipher and digest algorithms.

  -B <file>    Search using binary passwords (instead of character passwords).
               Write candidates to <file>.

  -b <string>  Beginning of the password.
                 default: ""

  -c <cipher>  Cipher for decryption.
                 default: aes-256-cbc

  -d <digest>  Digest for key and initialization vector generation.
                 default: md5

  -e <string>  End of the password.
                 default: ""

  -f <file>    Read the passwords from a file instead of generating them.

  -h           Show help and quit.

  -L <n>       Limit the maximum number of tested passwords to <n>.

  -l <length>  Minimum password length (beginning and end included).
                 default: 1

  -M <string>  Consider the decryption as successful when the data starts
               with <string>. Without this option, the decryption is considered
               as successful when the data contains mostly printable ASCII
               characters (at least 90%).

  -m <length>  Maximum password length (beginning and end included).
                 default: 8

  -N           Ignore decryption errors (similar to openssl -nopad).

  -n           Ignore salt (similar to openssl -nosalt).

  -p <n>       Preview and check the first <n> decrypted bytes for the magic
               string. If the magic string is present, try decrypting the rest
               of the data.
                 default: 1024

  -s <string>  Password character set.
               default: "0123456789ABCDEFGHIJKLMNOPQRSTU
                         VWXYZabcdefghijklmnopqrstuvwxyz"

  -t <n>       Number of threads to use.
               default: 1

  -v <n>       Print progress info every n seconds.

  -w <file>    Restore the state of a previous session if the file exists,
               then write the state to the file regularly (~ every minute).

Limitations

The program considers decrypted data as correct if it is mainly composed of printable ASCII characters (at least 90%). If the file you want to decrypt doesn't contain plain text, you will have to either use the -M option, or modify the 'valid_data' function in the source code to match your needs.

If the file you want to decrypt is big, you should use the -N option on a truncated version of the file (to avoid decrypting the whole file with each password).

Examples

Try to find the password of an aes256 encrypted file using 4 threads, trying only passwords with 5 characters:

bruteforce-salted-openssl -t 4 -l 5 -m 5 -c aes256 encrypted.file

Try to find the password of a des3 encrypted file using 8 threads, trying only passwords with 9 to 11 characters, beginning with "AbCD", ending with "Ef", and containing only letters:

bruteforce-salted-openssl -t 8 -l 9 -m 11 -c des3 -b "AbCD" -e "Ef" \
  -s "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" encrypted.file

Try to find the password of an aes256 encrypted file using 6 threads, trying the passwords contained in a dictionary file:

bruteforce-salted-openssl -t 6 -f dictionary.txt -c aes256 encrypted-file

Print progress info every 30 seconds:

bruteforce-salted-openssl -t 6 -f dictionary.txt -c aes256 -v 30 encrypted-file

Try to find the password of a des3 encrypted gzip file using 8 threads:

bruteforce-salted-openssl -t 8 -v 5 -c des3 -m 9 -s "0123456789" -M "$(echo -ne '\x1f\x8b')" file.tar.gz.des3

Save/restore state between sessions:

bruteforce-salted-openssl -t 6 -f dictionary.txt -c aes256 -w state.txt encrypted-file
  (Let the program run for a few minutes and stop it)
bruteforce-salted-openssl -t 6 -c aes256 -w state.txt encrypted-file

Show the list of available algorithms:

bruteforce-salted-openssl -a

If the program finds a candidate password 'pwd', you can decrypt the data using the 'openssl' command:

openssl enc -d -aes256 -salt -in encrypted.file -out decrypted.file -k pwd
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