mguezuraga.rb

require 'openssl'
require 'digest/sha1'

require 'base64'

@cipher = OpenSSL::Cipher.new('aes-256-cbc')

def encrypt(data, key)
    @cipher.encrypt
    @cipher.key = key
    rc = @cipher.update(data)
    rc << @cipher.final

    return rc
end

def decrypt(data, key)
    @cipher.decrypt
    @cipher.key = key

    rc = @cipher.update(Base64::decode64(data))
    rc << @cipher.final

    return rc
end

key_40bytes = Digest::SHA1.hexdigest('ac4feb33d990c4b6ab1dbc8fb533cdecbffd443b')
key_32bytes = Digest::SHA1.hexdigest('ac4feb33d990c4b6ab1dbc8fb533cdecbffd443b')[0,32]

key = key_32bytes
secret = "super secret text"
secret_encripted_32 = Base64::encode64(encrypt(secret, key)).strip.delete("\n")
secret_decripted = decrypt(secret_encripted_32, key)
puts "Key used: #{key}"
puts "Encrypted text (base64): #{secret_encripted_32}"
puts "Decrypted text: #{secret_decripted}"
puts "Key used: #{key}"
puts "Key length: #{key.bytesize}"
puts "----"

key = key_40bytes
secret = "super secret text"
secret_encripted_40 = Base64::encode64(encrypt(secret, key)).strip.delete("\n")
secret_decripted = decrypt(secret_encripted_40, key)
puts "Key used: #{key}"
puts "Encrypted text (base64): #{secret_encripted_40}"
puts "Decrypted text: #{secret_decripted}"
puts "Key used: #{key}"
puts "Key length: #{key.bytesize}"

puts "Secrets match!" if secret_encripted_32 == secret_encripted_40