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Core of WHY2 - encryption functions
§WHY2 Core
This module implements the core encryption logic behind WHY2 algorithm.
§Design Overview
- Input and key are formatted into 2D grids of 64-bit cells.
- The key grid is shuffled and seeded to generate round keys.
- Each round applies a nonlinear transformation to the input grids.
- The transofrmation avoid traditional S-boxes, relying instead on symmetric diffusion.
- Round tweaks ensure variability across rounds without requiring per-round constants.
§Deprecation Notice
Some parts of this module are deprecated and retained only for reference and legacy compatibility. Those parts are early versions of the WHY2 encryption routines that are considered insecure.
Due to identified security concerns and lack of cryptographic robustness, this module should not be used in production.
These deprecated components are not actively documented or maintained. They remain visible for historical context, but all future documentation efforts are focused on secure and supported modules.
For secure applications, use core::rex—the current and trusted implementation of the WHY2 encryption engine.