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Cryptographic library for Python

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  • License: BSD License, Public Domain (BSD, Public Domain)
  • Author: Helder Eijs
  • Requires: Python !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*, !=3.6.*, >=2.7
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PyCryptodome is a self-contained Python package of low-level cryptographic primitives.

It supports Python 2.7, Python 3.7 and newer, and PyPy.

You can install it with:

pip install pycryptodome

All modules are installed under the Crypto package.

Check the pycryptodomex project for the equivalent library that works under the Cryptodome package.

PyCryptodome is a fork of PyCrypto. It brings several enhancements with respect to the last official version of PyCrypto (2.6.1), for instance:

  • Authenticated encryption modes (GCM, CCM, EAX, SIV, OCB)

  • Hybrid Public Key Encryption (HPKE)

  • Accelerated AES on Intel platforms via AES-NI

  • First class support for PyPy

  • Elliptic curves cryptography (NIST P-curves; Ed25519, Ed448, Curve25519)

  • Better and more compact API (nonce and iv attributes for ciphers, automatic generation of random nonces and IVs, simplified CTR cipher mode, and more)

  • SHA-3 (including SHAKE XOFs) and BLAKE2 hash algorithms

  • Salsa20 and ChaCha20 stream ciphers

  • scrypt and HKDF

  • Deterministic (EC)DSA and EdDSA

  • Password-protected PKCS#8 key containers

  • Shamir’s Secret Sharing scheme

  • Random numbers get sourced directly from the OS (and not from a CSPRNG in userspace)

  • Simplified install process, including better support for Windows

  • Cleaner RSA and DSA key generation (largely based on FIPS 186-4)

  • Major clean ups and simplification of the code base

PyCryptodome is not a wrapper to a separate C library like OpenSSL. To the largest possible extent, algorithms are implemented in pure Python. Only the pieces that are extremely critical to performance (e.g. block ciphers) are implemented as C extensions.

For more information, see the homepage.

All the code can be downloaded from GitHub.

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