odzhan

/**
Find involutory exponents for a modulus like a Mersenne prime: 2^31-1
Uses brute force
Very fast for small numbers, very slow for anything more than 16-bits.

gcc -O2 find_exp.c -ofind_exp -lcrypto
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>

odzhan

#!/usr/bin/env python3
"""
Affine Permutation File Encoder/Decoder

This script allows you to encode and decode files using an Affine Permutation.
It uses command-line arguments to specify the operation mode (encode or decode), input file, and output file.
Additionally, it stores a SHA256 hash of the original data to verify successful decoding.

Usage:
    To encode a file:

odzhan

/**
LCG output...
lcg(1) : 40B2947B
lcg(2) : 73718F14
lcg(3) : 6203F04B
lcg(4) : 1BB91A70
lcg(5) : 0CFC23E0

ICG output...
icg(5) : 0CFC23E0

odzhan

//
// FEAL-8 Block Cipher
//

#include <stdio.h>
#include <stdint.h>

// Define the Sd function as per equation (7.6)
uint8_t Sd(uint8_t x, uint8_t y, uint8_t d) {

odzhan

/**
    ARADI and LLAMA: Low-Latency Cryptography for Memory Encryption
   
    Published in August 2024
    Only tested on little-endian CPU.
   
    For more details, see https://eprint.iacr.org/2024/1240
*/

#include <stdint.h>

odzhan

# ElGamal encryption

import random
from sympy import isprime, mod_inverse

# Generate a large prime number for the modulus (p)
def generate_large_prime(bits=256):
    while True:
        p = random.getrandbits(bits)
        if isprime(p):

odzhan

import hashlib
import secrets

# Elliptic Curve Parameters (placeholders for educational purposes)
p = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F  # Field prime
a = 0
b = 7
n = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141  # Order of G

# Base point G (using Bitcoin's secp256k1 parameters for illustration)

odzhan

'''
    Schnorr Digital Signature Scheme based on paper: 
        Efficient Signature Generation by Smart Cards, published in March 1991 by Claus-Peter Schnorr
    
'''

from random import randint
import sympy
import hashlib

odzhan

/**

    Running test...key : 803D8AB2E5B6E6FCA715737C3A82F7CE3C783124F6D51CD0
    Session keys match...
    OK.
    Generating random keys...OK
    Private Key for Alice : 31FA1084
    Private Key for Bob   : 2D748885

    Generating public keys...

odzhan

/**
    ECC-32 implementation

    Private Key for Alice : 775bd026
    Private Key for Bob   : 5133580e

    Public Key for Alice : (32f20f84, 63852a02)
    Public Key for Bob   : (6d4444c2, 1563edf9)

    Session Key for Alice : (2f3a9fa3, 6a9fa1ce)