simple crypto tool
v0.2.1 - experimental
PBP is a simple python wrapper and a command line interface around libsodium, to provide basic functionality resembling PGP. It uses scrypt for a KDF and a much simpler packet format, which should be much harder to fingerprint, pbp also provides an experimental forward secrecy mode and a multi-party DH mode.
You possibly need to run (or an equivalent command) sudo apt-get install git python-virtualenv gcc python-dev libffi-dev scrypt to satisfy all basic dependencies. And install libsodium (http://doc.libsodium.org/installation/README.html).
pip install pbp
optionally for PITCHFORK support also
pip install pyusb==1.0.0b1
- use modern crypto
- provide similar functionality to PGP
- be extensible
- difficult to identify based on fingerprinting
- provide extensive testing
- strive for security
Cryptographic primitives are based on the NaCl library from http://nacl.cr.yp.to. The KDF used is scrypt.
Provides basic public key encrypt/decrypt, sign/verify and secret key encrypt/decrypt modes, as well as the ability to sign, verify, list, generate, export and import keys.
using pbp and the underlying pysodium library it’s easy to extend pbp. Some examples are the experimental forward secrecy mode (see description in doc/chaining-dh.txt), the support for ECDH key exchanges from the command-line and generation of arbitrarily large random byte streams.
pbp tries to avoid to store any sensitive plaintext info, the encrypted files all should look like random noise. for a description of the packet formats see doc/fileformats.txt.
All py files come with their internal tests, unit tests are in tests.py, and commandline functionality is tested in test.sh.
pbp locks the process memory, so it cannot be swapped to disk. Also pbp uses SecureString to overwrite sensitive key material after usage in memory, so keys have a short window of opportunity to leak.
Generate a key
pbp -g -n alice
sending howdy.txt using public key encryption from alice to bob
pbp -c -S alice -r bob -i howdy.txt
decrypt an encrypted file using public key crypto
pbp -d -S bob -i howdy.txt.pbp
sending howdy.txt using secret key encryption
pbp -c -i howdy.txt
decrypt an encrypted file using secret key crypto
pbp -d -i howdy.txt.pbp
pbp -s -S alice -i /howdy.txt
pbp -v -i howdy.txt.sig
sign bobs key
pbp -m -S alice -n bob
check sigs on carols key
pbp -C -n carol
alice encrypts howdy.txt to bob using experimental forward secret mode
pbp -e -S alice -r bob -i howdy.txt -o ./secret-message
bob decrypts howdy.txt from alice using experimental forward secret mode
pbp -E -S bob -r alice -i ./secret-message
initiate ECDH key exchange
respond to ECDH key exchange
pbp -D2 -Dp ‘public component from D1’
finish ECDH key exchange
pbp -D3 -Dp ‘public component from D2’ -De ‘secret exponent from D1’
random streaming 23GByte of cryptographic randomness
pbp -R -Rs 23G -o /mnt/huge_fs/random_data
participate in a 4-way DH exchange, 1st message
pbp -Ds -Dp 4 -S alice -n ‘friends001’ -i oldkeychain -o newkeychain
participate in a 4-way DH exchange, 2nd message
pbp -De -S alice -n ‘friends001’ -i oldkeychain -o newkeychain
this is one big pipe that creates a 3-way ECDH secret between alice, bob and carol:
- pbp -Ds -S alice -Dp 3 -n ‘test-dh’ -i /dev/null |
- pbp -Ds -S bob -Dp 3 -n ‘test-dh’ | pbp -Ds -S carol -Dp 3 -n ‘test-dh’ | pbp -De -S alice -Dp 3 -n ‘test-dh’ | pbp -De -S bob -Dp 3 -n ‘test-dh’
of course instead of a pipe you could use any kind of transport mechanism
you can add the following to your .vimrc
map ;e :%!/bin/sh -c ‘pbp -c 2>/dev/tty | base64’<C-M> map ;d :%!/bin/sh -c ‘base64 -d | pbp -d 2>/dev/tty’<C-M> map ;s :,$! /bin/sh -c ‘pbp -s -a -S stf 2>/dev/tty’<C-M> map ;v :,$! /bin/sh -c ‘pbp -v -a 2>/dev/tty’<C-M>
 also it’s very funny to say pbp with a mouth full of dry cookies. don’t try this in company!
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