======= stretch

stretch is a command line tool that uses PBKDF2 from Python's passlib to derive a key, given a secret and a salt.

Installation

You can, of course, clone the repo or download the stretch.py script and call it from its directory, but I'd rather have it "installed" so it can be called from anywhere. The easiest way to install it::

[sudo] pip install stretch

Instead, you could just copy the script to a convenient location::

[sudo] curl https://raw.githubusercontent.com/felipedau/stretch/master/stretch/stretch.py -o /usr/local/bin/stretch

Finally, stretch the secret foo with the salt bar using the defaults hmac-sha512 and 10000 rounds::

$ stretch foo bar
FUMV4GHTdgpdEbseRSkUNiTd6CYktCUr3XPqy+pp7cPk7R7Ho0L1JJDXMbcYQkA/gkWQ7BoSOtRcMnvnD8qqhg==

+---------------------------------------+-------------------------------------+ | Optional Arguments | Description | +=======================================+=====================================+ | -h, --help | show this help message and exit | +---------------------------------------+-------------------------------------+ | -b BEGIN, --begin BEGIN | define where to start slicing the | | | result (equivalent to | | | result[b:]) | +---------------------------------------+-------------------------------------+ | -e END, --end END | define where to stop slicing the | | | result (equivalent to | | | result[:e]) | +---------------------------------------+-------------------------------------+ | -f {md5,sha1,sha256,sha512}, | choose a pseudo-random family. | | --family {md5,sha1,sha256,sha512} | | +---------------------------------------+-------------------------------------+ | -r ROUNDS, | define the number of rounds to use | | --rounds ROUNDS | on the generation (an integer | | | greater than zero). (Default: | | | 10000) | +---------------------------------------+-------------------------------------+ | -c, --copy | copy the output to the clipboard by | | | piping it to xclip instead of | | | printing | +---------------------------------------+-------------------------------------+

.. passlib: https://pythonhosted.org/passlib .. pbkdf2: https://pythonhosted.org/passlib/lib/passlib.utils.pbkdf2.html