Module encrypter 

REX Encrypter

This module defines the full encryption pipeline for WHY2, including Grid shaping and round-based mixing. It transforms raw data into encrypted Grid chunks using a symmetric key.

Overview

WHY2 encrypts data by converting it into fixed-size grids (Grid) and applying nonlinear and linear transformations across multiple rounds in CTR mode. The process includes:

1. Grid Shaping: Input is padded and split into Grid chunks.
2. Key Handling: A symmetric key is either provided or securely generated.
3. Nonce Generation: A random nonce is generated for CTR mode.
4. CTR Mode Encryption: Each plaintext Grid is XORed with a keystream block derived from encrypting the nonce plus block counter.

Functions

encrypt

Encrypts a vector of i64 values.

encrypt_string

Encrypts a string.