odzhan

odzhan / f8.c

Created September 15, 2024 05:56

FEAL Block Cipher Implementations from Handbook of Cryptography.


	//
	// 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.c

Last active August 12, 2024 05:17

	/**
	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 / encrypt.py

Created August 3, 2024 04:45

ElGamal Encryption and Digital Signatures

	# 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 / ecnr.py

Last active September 15, 2024 05:53

Nyberg-Rueppel Signature Scheme

	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 / schnorr1.py

Last active September 15, 2024 05:50

Schnorr Digital Signatures

	'''
	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 / bn_ecc.c

Last active July 31, 2024 07:32

ECDH using arbitrary-precision arithmetic

	/**

	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 / ecdh.cpp

Last active August 6, 2024 11:22

ECC-32 Implementation

	/**
	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)

odzhan / ecdh.py

Last active August 6, 2024 11:19

ECDH using P-192 prime192v1

	#
	# ECDH using P-192 prime192v1
	#
	# Runs very slow because of binary methods used.
	#
	import random

	# Elliptic curve parameters P-192 prime192v1
	p = 0xfffffffffffffffffffffffffffffffeffffffffffffffff

odzhan / regexp.cpp

Last active May 2, 2024 02:16

Simple regexp example using IRegExp interface.


	//
	// Simple regexp example using IRegExp interface.
	//

	/**
	# Found 4 matches.

	> test@gmail.com
	> spam@yahoo.com

odzhan / mask.cpp

Last active July 3, 2024 13:28

Obfuscation with byte substitution


	//
	// Simple obfuscation using byte substitution
	//

	#include <cstdio>
	#include <cstdint>
	#include <cstdlib>
	#include <cstring>
	#include <cmath>