Ruby DES-ECB & PKCS5Padding で暗号化

aec_cipher.rb

# 暗号モード: ECB
# パディング方式: PKCS5Padding
#  OpenSSL::Cipher.ciphers で利用可能な暗号方式名を取得可能
# https://docs.ruby-lang.org/ja/latest/class/OpenSSL=3a=3aCipher.html

module AesCipher extend self
  KEY = "Your key"
  CIPHER = "DES-ECB"

  def encrypt(text)
    cipher = OpenSSL::Cipher.new(CIPHER)
    cipher.encrypt
    cipher.key = KEY

    enc = cipher.update(text)
    enc << cipher.final

    Base64.encode64(enc)
  end

  def decrypt(text)
    enc = Base64.decode64(text)

    cipher = OpenSSL::Cipher.new("DES-ECB")
    cipher.decrypt
    cipher.key = KEY

    dec = cipher.update(enc)
    dec << cipher.final
  end
end