PyCryptodome¶
PyCryptodome is a self-contained Python package of low-level cryptographic primitives.
It supports Python 2.7, Python 3.6 and newer, and PyPy.
The installation procedure depends on the package you want the library to be in. PyCryptodome can be used as:
an almost drop-in replacement for the old PyCrypto library. You install it with:
pip install pycryptodome
In this case, all modules are installed under the
Crypto
package.One must avoid having both PyCrypto and PyCryptodome installed at the same time, as they will interfere with each other.
This option is therefore recommended only when you are sure that the whole application is deployed in a
virtualenv
.a library independent of the old PyCrypto. You install it with:
pip install pycryptodomex
In this case, all modules are installed under the
Cryptodome
package. PyCrypto and PyCryptodome can coexist.
For faster public key operations in Unix, you should install GMP in your system.
PyCryptodome is a fork of PyCrypto. It brings the following enhancements with respect to the last official version of PyCrypto (2.6.1):
Authenticated encryption modes (GCM, CCM, EAX, SIV, OCB)
Accelerated AES on Intel platforms via AES-NI
First class support for PyPy
Elliptic curves cryptography (NIST P-curves; Ed25519, Ed448, Curve25519, Curve448)
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 hash algorithms (FIPS 202) and derived functions (NIST SP-800 185):
SHAKE128 and SHA256 XOFs
cSHAKE128 and cSHAKE256 XOFs
KMAC128 and KMAC256
TupleHash128 and TupleHash256
KangarooTwelve, TurboSHAKE128, and TurboSHAKE256 XOFs
Truncated hash algorithms SHA-512/224 and SHA-512/256 (FIPS 180-4)
BLAKE2b and BLAKE2s hash algorithms
Salsa20 and ChaCha20/XChaCha20 stream ciphers
Poly1305 MAC
ChaCha20-Poly1305 and XChaCha20-Poly1305 authenticated ciphers
scrypt, bcrypt, HKDF, and NIST SP 800 108r1 Counter Mode key derivation functions
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.
For security issues, please send an email to security@pycryptodome.org.
All the code can be downloaded from GitHub.