stdkdf

A simple binary to derive a key from a salt and a password on the commandline with Argon2.

It uses a set of predefined options and only very few flags which makes it easy and quick to use. Output is either Base64 encoded or raw bytes.

install

Either simply use go get:

go get github.com/ansemjo/stdkdf

Or, if you have make installed, use the makefile to compile and install a smaller static binary:

make static
sudo make install

usage

The simplest mode is providing a salt via a flag and entering the password interactively:

$ stdkdf -salt helloreadme
Enter password:
CCmyoTeHa1JM5bPhEqnE5BY2PJTTYC/pw/LLz0W805Q=

For scripting purposes you can pipe the password on stdin:

$ printf password | stdkdf -salt helloreadme
CCmyoTeHa1JM5bPhEqnE5BY2PJTTYC/pw/LLz0W805Q=

Careful: when piping, trailing whitespace (e.g. a newline) is not stripped! Using echo instead of printf above yields a different key.

You can choose different cost settings using the -cost flag:

$ stdkdf -cost high -salt helloreadme
Enter password:
MlKrXtvG+WJgQ79+XO4ulFzFnTv3EzCrV8lN6OrTDQA=

And output raw bytes with the -raw flag:

$ printf password | stdkdf -salt helloreadme -raw > key
$ xxd key
00000000: 0829 b2a1 3787 6b52 4ce5 b3e1 12a9 c4e4  .)..7.kRL.......
00000010: 1636 3c94 d360 2fe9 c3f2 cbcf 45bc d394  .6<..`/.....E...
$ base64 key
CCmyoTeHa1JM5bPhEqnE5BY2PJTTYC/pw/LLz0W805Q=

cost settings

All settings output 32 byte hashes. The following cost settings are defined:

label	time cost	memory cost	threads	approx duration on i5-5200U
low	8	8 MB	1	70 msec
normal	16	64 MB	2	650 msec
high	32	256 MB	4	4 seconds