Cipher for remote containers derived from ssh-agent signed challenge data
sagecipher (ssh agent crypt) is a very small module which provides a cipher keyed through ssh-agent. The key is obtained by generating random challenge data, passing this to ssh-agent to obtain a signature via the users private ssh-key for use as key material, and finally passing this through PBKDF2.
pip install sagecipher
Before using, ssh-agent must be running with at least one ssh-key available for producing cipher key material:
$ source <(ssh-agent) Agent pid 3710 $ ssh-add Enter passphrase for /home/somebody/.ssh/id_rsa: Identity added: /home/somebody/.ssh/id_rsa (/home/somebody/.ssh/id_rsa)
>>> from sagecipher import * >>> cfail = Cipher() Traceback (most recent call last): File "<stdin>", line 1, in <module> File "sagecipher/cipher.py", line 101, in __init__ signature = sign_via_agent(self.challenge, self.fingerprint) File "sagecipher/cipher.py", line 230, in sign_via_agent raise SignError(SignError.E_NO_KEYS) sagecipher.cipher.SignError: SSH agent is not running or no keys are available
Using the cli tool to provide on-demand decryption to other tools
Check sagecipher --help for usage…
$ sagecipher encrypt - encfile secret sauce (CTRL-D) $ sagecipher decrypt encfile - secret sauce $ mkfifo decfile $ sagecipher decrypt encfile decfile &  16753 $ cat decfile secret sauce $
Using sagecipher in a Python program
>>> from sagecipher import * >>> >>> # Create a new cipher using first key available from ssh-agent >>> c1 = Cipher() >>> >>> # Use the cipher header to create a second/future instance >>> c2 = Cipher(c1.header()) >>> >>> # Display fingerprint of the SSH key used for derivation of cipher key >>> to_hex(c2.fingerprint) '11:66:89:44:a3:ec:9b:1c:55:cd:f7:54:20:3b:09:c3' >>> >>> # Encrypt with the first instance, decrypt back with the second... >>> unpad(c2.decrypt_string(c1.encrypt(pad("Hello, cryptic world!")))) 'Hello, cryptic world!' >>> >>> # Encrypt and decrypt using helper methods. The cipher header is >>> # stored in the encrypted ciphertext. >>> ciphertext = encrypt_string("Alice, I think someone is listening!") >>> plaintext = decrypt_string(ciphertext) >>> plaintext 'Alice, I think someone is listening!'
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