pysequoia 0.1.9

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PySequoia

Note: This is a work in progress. The API is not stable!

Building:

set -euxo pipefail
python3 -m venv .env
source .env/bin/activate
pip install maturin
maturin develop

Now open the console with python and import the library:

from pysequoia import Cert, Context

Available functions

encrypt

Signs and encrypts a string to one or more recipients:

s = Cert.from_file("signing-key.asc")
r = Cert.from_bytes(open("wiktor.asc", "rb").read())
encrypted = Context.standard().encrypt(s, r, "content to encrypt")
print(f"Encrypted data: {encrypted}")

sign

Signs the data and returns armored output:

from pysequoia import sign

s = Cert.from_file("signing-key.asc")
signed = sign(s.signer(), "data to be signed")

merge

Merges data from old certificate with new packets:

old = Cert.from_file("wiktor.asc")
new = Cert.from_file("wiktor-fresh.asc")
merged = old.merge(new)
print(f"Merged, updated cert: {merged}")

minimize

Discards expired subkeys and User IDs:

cert = Cert.from_file("wiktor.asc")
minimized = Context.standard().minimize(cert)
print(f"Minimized cert: {minimized}")

generate

Creates new general purpose key with given User ID:

alice = Cert.generate("Alice <[e-mail]>")
fpr = alice.fingerprint
print(f"Generated cert with fingerprint {fpr}:\n{alice}")

Newly generated certificates are usable in both encryption and signing contexts:

alice = Cert.generate("Alice <[e-mail]>")
bob = Cert.generate("Bob <[e-mail]>")

encrypted = Context.standard().encrypt(alice, bob, "content to encrypt")
print(f"Encrypted data: {encrypted}")

WKD

Fetching certificates via Web Key Directory:

from pysequoia import WKD
import asyncio

async def fetch_and_display():
    cert = await WKD.search(email = "[e-mail]")
    print(f"Cert found via WKD: {cert}")
    assert cert.fingerprint == "5b7abe660d5c62a607fe2448716b17764e3fcaca"

asyncio.run(fetch_and_display())

Key server

Fetching certificates via HKPS protocol:

from pysequoia import KeyServer
import asyncio

async def fetch_and_display():
    ks = KeyServer("hkps://keys.openpgp.org")
    cert = await ks.get("653909a2f0e37c106f5faf546c8857e0d8e8f074")
    print(f"Cert found via HKPS: {cert}")
    assert cert.fingerprint == "653909a2f0e37c106f5faf546c8857e0d8e8f074"

asyncio.run(fetch_and_display())

CertD integration

The library exposes OpenPGP Certificate Directory integration which allows storing and retrieving OpenPGP certificates in a persistent way directly in the file system.

Note that this will not allow you to read GnuPG-specific key directories.

from pysequoia import Store

cert = Cert.from_file("wiktor.asc")
s = Store("/tmp/store")
s.put(cert)
assert s.get(cert.fingerprint) != None

The certificate is now stored in the given directory and can be retrieved later by its fingerprint:

s = Store("/tmp/store")
assert s.get("653909a2f0e37c106f5faf546c8857e0d8e8f074") != None

OpenPGP Cards

There's an experimental feature allowing communication with OpenPGP Cards (like Yubikey or Nitrokey).

from pysequoia import Card

# enumerate all cards
all = Card.all()

# open card by card ident
card = Card.open("card ident")

print(card.ident)
print(card.cardholder)

signer = card.signer(input("PIN: "))

signed = sign(signer, "data to be signed")