pysealer

library1.0.4pypypi✓ verified 82d ago

PySealer (v1.0.4) cryptographically signs Python functions and classes to provide defense-in-depth security against code injection and tampering. It allows developers to seal callables with HMAC signatures verified at runtime. Active development on GitHub, monthly releases.

auth-security devops

pip install pysealer

github ↗package ↗

INSTALL

IMPORT

SIG · PYSEALER

pysealer

auth-securitypythonv1.0.4

Install

5.9s avg

Import

—

Disk

62MB

Pass rate

10/ 10

Env Coverage10 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v1.0.4 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.95 runs

installs and imports cleanly · install 0.0s · import 0.000s · 62.7MB

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 5.9s · import 0.000s · 63MB

62MB installed

● package 62MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

seal

✓ from pysealer import dummy_decorators

✗ from pysealer import seal

generate_keypair

✓ from pysealer import generate_keypair

verify_signature

✓ from pysealer import verify_signature

Seal a function with HMAC key and verify before execution.

from pysealer import seal, verify import os key = os.environ.get('SEAL_KEY', 'default-secret') @seal(key=key) def safe_add(a, b): return a + b # Verify and call result = verify(safe_add, key=key)(2, 3) print(result) # 5

pysealer --version

Debug

Known issues

gotchaThe `seal` decorator only works on plain functions and classes, not lambdas, partials, or built-in functions.

fix

Use a named function or class defined via def or class statement.

affects: >=1.0.0

gotchaIf the key is lost, sealed objects become permanently unusable — there is no recovery or backdoor.

fix

Store the key safely (e.g., environment variable, secrets manager) and never hardcode in source.

affects: >=1.0.0

deprecatedThe function `seal_with_env_var()` is deprecated and will be removed in v2.0. Use `seal(key=os.getenv('KEY'))` instead.

fix

Replace `seal_with_env_var('MY_KEY')` with `seal(key=os.getenv('MY_KEY'))`.

affects: >=1.0.0 <2.0.0

Upgrade

Version history

1.0.4latest on PyPI · released Mar 27, 2026

Audit

Dependencies

No dependency data recorded yet.

Agent activity

22 hits · last 30 days

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OpenAI (training)

Resources

githubhttps://github.com/MCP-Security-Research/pysealer ↗

packagehttps://pypi.org/project/pysealer/ ↗