Inversion-des

require 'openssl'
require 'base64'

# AES256 encryption
def aes_encrypt(text, key)
	cipher = get_cipher.tap { _1.encrypt; _1.key = key }
	iv = cipher.random_iv  # 16 bytes
	cipher_text = cipher.update(text) + cipher.final
	# *ensure there is no newline char in the encoded text
	Base64.strict_encode64(iv + cipher_text)

Inversion-des

require 'optparse'

class Practice
	def initialize
		@fname = 'data.txt'
		# predefined key for the demo (32-byte)
		@key = "12345678901234567890123456789012"
		# prepage libraries in bg for faster start
		@libs_loading_thr = Thread.new do
			require 'openssl'

Inversion-des

require 'sinatra'
require 'sqlite3'
require 'bcrypt'

# initialize SQLite database
DB = SQLite3::Database.new 'users.db'
DB.results_as_hash = true

# create users table if needed
DB.execute <<-SQL