aymkx

import sys, os
import numpy
from PIL import Image
from PIL.ExifTags import TAGS



def get_exif(file):
    try:
        with Image.open(file) as im:

aymkx

import random, time, subprocess

def powmod(base, exp, mod):
    buf = 1

    for i in range(exp.bit_length() - 1, -1, -1):
        buf = ((buf ** 2) * (base ** ((exp >> i) & 1))) % mod

    return buf

aymkx

module PrimeNumber 
    def self.powmod(base, exp, mod)
        return 1 if exp == 0
        exp.bit_length.times.inject(1) do |buf, i|
            (buf ** 2) * (base ** exp[exp.bit_length - 1 - i]) % mod
        end
    end

    def self.miller_rabin_prime?(num, trial)
        return false if num.even? || num < 3

aymkx

require 'securerandom'
require 'matrix'

module RSA
    module Calculator
        def self.powmod(base, exp, mod)
            return 1 if exp == 0
            exp.bit_length.times.inject(1) do |buf, i|
                (buf ** 2) * (base ** exp[exp.bit_length - 1 - i]) % mod
            end

aymkx

module Binary 
    # or MD5.module_eval(using Module.new{refine Class {~}...})

    INTEGER_SIZE = 32

    refine Integer do        
        def bit_rotate(bit_width=INTEGER_SIZE,shift=1)
            raise ArgumentError if bit_width.negative?
            shift = shift % bit_width
            ((self << shift) + (self >> (bit_width - shift) & ((1 << shift) - 1))) & ((1 << bit_width) - 1)