laimassey 0.1.1

Pure-Python Lai–Massey block ciphers: IDEA-LM, FOX-LM, MISTY1-LM with ECB/CBC/CTR modes.

Lai–Massey Cryptographic Library

This project implements several block ciphers based on the Lai–Massey scheme:

• IDEA-LM
• FOX-LM
• MISTY1 (full cipher)
• MISTY1-LM variant
• ECB / CBC / CTR modes

The implementation is pure Python and designed for learning, research, and security experimentation.

Features

• Modular architecture
• Realistic key schedules
• Reversible encryption/decryption
• Fully separated FI/FO/FL for MISTY1
• Test suite included

Quick Example

from laimassey.idea_lm import IDEA_LM

cipher = IDEA_LM(key=b"1234567890ABCDEF")
ct = cipher.encrypt_block(b"ABCDEFGH")
pt = cipher.decrypt_block(ct)
print(pt)