🧃.c

Author

Heikki Juva

Introduction

This is my submission for MEHU1-hash algorithm, as part of 1st annual "Tiivistekilpailu" (Hashing competition), organized by AB MEHU Limited

Fancy-sounding principles in this design

Design follows Merkle-Damgård construction, of iterating each block of data through all rounds individually
Application utilizes ideas from Feistel network, where each round is a function of the previous round
Design is based on SPN, Substitution-Permutation Network. Each round consists of subsitution, permutation and round key addition
The core inspiration for this masterpiece is based on the ADCS-principle of Kouvosto Telecom; Always Deliver Concrete Service

Usage

🧃 [-d] [-r] [-p] [-f filename | data]

-d is debug mode, shows what's happening
-f reads input from a file. Without it, reads input data from command line
-r is random emoji generator mode. Use with seed data on the command line.
-p shows progress in file input mode

Install

Compiles at least with gcc on OSX: gcc -o $'\360\237\247\203'.bin $'\360\237\247\203'.c

Key generation

S-box

head -c 655360 /dev/urandom | LC_CTYPE=C tr -dc '[:print:]' | head -c 65536 > sbox.txt

Round s-box

openssl rand -hex 256

Copy result to #define ROUND_SBOX

Permutation tables and master key

openssl rand -hex 16

Copy result to #define PERMUTATION, #define ROUND_PERMUTATION and #define MASTER_KEY

Zokol/emojihash

🧃.c