jenc 0.0.1.dev1

Python jenc jpencconverter encryption implementation

jenc-py

• Working - jenc/Markor decrypt tool
• Not yet working - jenc/Markor encrypt tool

The aim is to have a pure python (with crypto dependencies) jenc (as used by Markor) decrypt/encrypt library.

Test jenc file https://github.com/opensource21/jpencconverter/blob/master/src/test/encrypted/Test3.md.jenc Test password geheim from https://github.com/opensource21/jpencconverter/blob/master/src/test/resources/application.properties

jenc file format

There are multiple versions V001 (and the old U001).

File format:

• 4 bytes - define the version.
• nonce bytes - bytes as nonce for cipher depends. The length depends on the version.
• salt bytes - bytes to salt the password. The length depends on the version.
• content bytes - the encrypted content-bytes.

From the original Java code for jpencconverter it appears that strings are converted to/from UTF-8 (i.e. passwords and plaintext).

jenc file format - V001

From Python code:

# note CamelCase to match https://github.com/opensource21/jpencconverter/blob/f65b630ea190e597ff138d9c1ffa9409bb4d56f7/src/main/java/de/stanetz/jpencconverter/cryption/JavaPasswordbasedCryption.java#L229
'keyFactory': 'PBKDF2WithHmacSHA512',
'keyIterationCount': 10000,  # this is probably too small/few in 2024
'keyLength': 256,
'keyAlgorithm': 'AES',
'keySaltLength': 64,  # in bytes
'cipher': 'AES/GCM/NoPadding',
'nonceLenth': 32,  # nonceLenth (sic.) == Nonce Length  # in bytes