bruteforce-salted-openssl - try to find the passphrase for files
encrypted with OpenSSL
bruteforce-salted-openssl [options] <filename>
bruteforce-salted-openssl tries to find the passphrase or password of a
file that was encrypted with the openssl command. It can be used in two ways:
- •
- Try all the possible passwords given a charset.
- •
- Try all the passwords in a file (dictionary).
bruteforce-salted-openssl has the following features:
- •
- You can specify the number of threads to use when cracking
a file.
- •
- 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.
- •
- There are an exhaustive mode and a dictionary mode.
In the exhaustive mode the program tries to decrypt the file by trying all
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 some 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).
In 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.
- -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. The default value is
"".
- -c <cipher>
- Cipher for decryption. The default value is
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 value is
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
- -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).
Note: Sending a USR1 signal to a running
bruteforce-salted-openssl
process makes it print progress info to standard error and continue.
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).
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
bruteforce-salted-openssl was written by Guillaume LE VAILLANT. For
contact, use the email <
[email protected]> or go to
https://github.com/glv2/ bruteforce-salted-openssl.
This manual page was written by Joao Eriberto Mota Filho
<
[email protected]> for the Debian project (but may be used by
others).