xtea_cython
High-performance XTEA encryption implementation using Cython. Drop-in replacement for the PyPI xtea library.
Installation
pip install xtea_cython
Requirements: Python 3.8+, no runtime dependencies.
Usage
Basic Encryption (CBC Mode)
import os
from xtea_cython import encrypt_cbc, decrypt_cbc
key = os.urandom(16) # 128-bit key
iv = os.urandom(8) # 64-bit IV
plaintext = b"Hello, World!"
# Encrypt (with automatic padding)
ciphertext = encrypt_cbc(plaintext, key, iv, auto_pad=True)
# Decrypt
decrypted = decrypt_cbc(ciphertext, key, iv, auto_unpad=True)
assert decrypted == plaintext
Without Padding (PyPI xtea Compatible)
from xtea_cython import encrypt_cbc, decrypt_cbc
import xtea
key = b"0123456789abcdef"
iv = b"abcdefgh"
data = b"12345678" * 10 # Must be multiple of 8 bytes
# Both produce identical results
result1 = encrypt_cbc(data, key, iv)
result2 = xtea.new(key, mode=xtea.MODE_CBC, IV=iv).encrypt(data)
assert result1 == result2 # True
Stream Modes (CTR, CFB, OFB) - No Padding Required
from xtea_cython import encrypt_ctr, decrypt_ctr
nonce = os.urandom(8)
ciphertext = encrypt_ctr(plaintext, key, nonce)
decrypted = decrypt_ctr(ciphertext, key, nonce)
assert decrypted == plaintext
Raw Block Encryption
from xtea_cython import encrypt_block, decrypt_block
block = b"12345678" # Exactly 8 bytes
key = b"0123456789abcdef" # Exactly 16 bytes
encrypted = encrypt_block(block, key)
decrypted = decrypt_block(encrypted, key)
Manual Padding Control
from xtea_cython import encrypt_cbc, decrypt_cbc, pkcs7_pad, pkcs7_unpad
# Pad manually
padded = pkcs7_pad(plaintext)
ciphertext = encrypt_cbc(padded, key, iv)
# Unpad manually
decrypted_padded = decrypt_cbc(ciphertext, key, iv)
decrypted = pkcs7_unpad(decrypted_padded)
ECB Mode
from xtea_cython import encrypt_ecb, decrypt_ecb
ciphertext = encrypt_ecb(plaintext, key, auto_pad=True)
decrypted = decrypt_ecb(ciphertext, key, auto_unpad=True)
⚠️ Warning: ECB mode is not secure for most use cases. Same plaintext blocks produce same ciphertext blocks. Use CBC or CTR instead.
Helper Functions
from xtea_cython import generate_key, generate_iv, pkcs7_pad, pkcs7_unpad
key = generate_key() # 16-byte random key
iv = generate_iv() # 8-byte random IV
padded = pkcs7_pad(data)
unpadded = pkcs7_unpad(padded)
Custom Rounds
# Default: 64 Feistel rounds (32 cycles)
ciphertext = encrypt_cbc(plaintext, key, iv, auto_pad=True)
# Faster but less secure
ciphertext = encrypt_cbc(plaintext, key, iv, rounds=32, auto_pad=True)
# More secure
ciphertext = encrypt_cbc(plaintext, key, iv, rounds=128, auto_pad=True)
Performance
Benchmarks vs PyPI xtea library:
| Operation | xtea_cython | PyPI xtea | Speedup |
|---|---|---|---|
| Raw block | 73.2M ops/s | 1.0M ops/s | 73x |
| ECB 64B | 2.1M ops/s | 57K ops/s | 37x |
| CBC 64B | 1.8M ops/s | 127K ops/s | 14x |
| CTR 1KB | 1.2M ops/s | 110K ops/s | 11x |
| CFB 1KB | 1.3M ops/s | 95K ops/s | 14x |
| OFB 1KB | 1.3M ops/s | 92K ops/s | 14x |
Run benchmarks:
pip install xtea
python benchmarks.py
Development
git clone https://github.com/somjik-api/xtea_cython.git
cd xtea_cython
python -m venv .venv
source .venv/bin/activate
pip install -e ".[dev]"
pytest tests/ -v
Contributing
- Fork the repository
- Create a feature branch
- Make changes and add tests
- Run
pytest tests/ - Submit a pull request
License
MIT License - see LICENSE for details.
1 maintainer
Release files for xtea-cython 1.0.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| xtea_cython-1.0.0.tar.gz | 148.8 kB | Details |
Built distributions (wheels)
Total release size:2.7 MB
Release files / xtea_cython-1.0.0.tar.gz
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