ssh-crypt 1.1.2

ssh-crypt is a tool to encrypt/decrypt data using your ssh key from ssh-agent

Why you may need it

Sometimes you want to store your password into your shell scripts but it's not very safe to keep raw passwords in it

This module can help you to solve this problem by keeping your passwords encrypted.

The idea is you have your ssh key which protected with master password and there is an ssh-agent which can keep your ssh key, so you can use it as encryption key, until you have your key in ssh-agent you can decrypt your passwords in your shell scripts, while if ssh key is in not in your ssh-agent you(or somebody else) can't use it to encrypt/decrypt passwords or other sensitive data, here how you can use it: You add your ssh key into ssh-agent:

/usr/bin/ssh-add -t 1d -k ~/.ssh/id_rsa

You enter master password and now you have ssh key in your ssh-agent, Now you can use it to encrypt passwords or other sensitive data:

ssh-crypt -e -s 'testpassword'

You get string which contains your encrypted password, copy it, you can use it further, lets write a shell script:

!/bin/bash

PASS='{V|B;*R$Ep:HtO~*;QAd?yR#b?V9~a34?!!sxqQT%{!x)bNby^5'

mysql -h localhost -u testuser -p$(ssh-crypt -d -s $PASS)

so now you don't have raw password in you shell script anymore, while this encrypted password can be decrypted only if your ssh key still in your ssh-agent

Also you can use it just to encrypt/decrypt files like here:

ssh-crypt -e -i /tmp/rawfile -o /tmp/encrypted_file
ssh-crypt -d -i /tmp/encrypted_file -o /tmp/rawfile

How it works

When you encrypt your password it generates random bytes, which signed by you ssh key from your ssh-agent, then it creates sha3_256 from this signature and uses it as a key to encrypt your data with AES and creating base85 of it if binary mode is not enabled

When you decrypt your password it takes nonce bytes from the string you pass, signs it with your ssh key, creates sha3_256 from it and uses it as a AES key to decrypt the rest of data

How to install it

pip install ssh-crypt

How to use it in python scripts

from ssh_crypt import E

super_secret_password = str(E('{V|B;*R$Ep:HtO~*;QAd?yR#b?V9~a34?!!sxqQT%{!x)bNby^5'))

Options

-h, --help

Prints brief usage information.

-e, --encrypt

Encrypt incomming data

Examples:

ssh-crypt -e -s 'testpassword'
echo 'testpassword' | ssh-crypt -e

-d, --decrypt

Decrypt incomming data, if not set encrypt mode will be enabled

Examples:

ssh-crypt -d -s '{V|B;*R$Ep:HtO~*;QAd?yR#b?V9~a34?!!sxqQT%{!x)bNby^5'
echo '{V|B;*R$Ep:HtO~*;QAd?yR#b?V9~a34?!!sxqQT%{!x)bNby^5' | ssh-crypt -e

-i, --input

Input file, if not set STDIN will be used

Examples:

ssh-crypt -e -i /tmp/testfile
ssh-crypt -d -i /tmp/testfile
ssh-crypt -e -b -i /tmp/testfile

-o, --output

Output file, if not set STDOUT will be used

Examples:

ssh-crypt -e -s 'testpassword' -o /tmp/testfile
echo 'testpassword' | ssh-crypt -e -o /tmp/testfile

-s, --string

Use passed string as an input data

Examples:

ssh-crypt -e -s 'testpassword'
ssh-crypt -d -s '{V|B;*R$Ep:HtO~*;QAd?yR#b?V9~a34?!!sxqQT%{!x)bNby^5'

-b, --binary

Not use base85(used to make encrypted data look more like text file, to allow to copy it into shell scripts) for payload

Examples:

ssh-crypt -e -s 'testpassword' -b -o /tmp/testfile
ssh-crypt -e -i /tmp/testfile -b

-k, --key

Pick key in ssh-agent keys list by its comment

Examples:

ssh-crypt -e -s 'testpassword' -k testkey
ssh-crypt -d -s '{V|B;*R$Ep:HtO~*;QAd?yR#b?V9~a34?!!sxqQT%{!x)bNby^5' -k testkey

Bugs

See github issues: https://github.com/Sets88/ssh-crypt/issues