Method: Decrypt.ciphertext

Defined in:
lib/encrypt_column/decrypt.rb

.ciphertext(ciphertext, key = ENV['ENCRYPT_KEY']) ⇒ Object 



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# File 'lib/encrypt_column/decrypt.rb', line 11

def self.ciphertext(ciphertext, key = ENV['ENCRYPT_KEY'])
  raise 'Encryption Key Config Missing' unless key.present?
  return 'ERROR: Missing encryption ciphertext' if ciphertext.nil? || ciphertext.blank?
  enciphered, iv = ciphertext.split('--', 2).map { |part| part.unpack('m')[0] }
  decipher = OpenSSL::Cipher::AES256.new(:CBC)

  decipher.decrypt
  decipher.key = key
  decipher.iv = iv

  deciphered = decipher.update(enciphered)
  deciphered << decipher.final
end