Class: Chamber::EncryptionMethods::Ssl

Inherits:
Object
  • Object
show all
Defined in:
lib/chamber/encryption_methods/ssl.rb

Constant Summary collapse

LARGE_DATA_STRING_PATTERN =

rubocop:disable Metrics/LineLength

%r{\A([A-Za-z0-9\+\/#]*\={0,2})#([A-Za-z0-9\+\/#]*\={0,2})#([A-Za-z0-9\+\/#]*\={0,2})\z}

Class Method Summary collapse

Class Method Details

.decrypt(key, value, decryption_key) ⇒ Object 



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# File 'lib/chamber/encryption_methods/ssl.rb', line 25

def self.decrypt(key, value, decryption_key)
  if decryption_key.nil?
    value
  else
    key, iv, decoded_string = value.
                                match(LARGE_DATA_STRING_PATTERN).
                                captures.
                                map do |part|
                                  Base64.strict_decode64(part)
                                end
    key = decryption_key.private_decrypt(key)

    cipher_dec = OpenSSL::Cipher::Cipher.new('AES-128-CBC')

    cipher_dec.decrypt

    cipher_dec.key = key
    cipher_dec.iv = iv

    begin
      unencrypted_value = cipher_dec.update(decoded_string) + cipher_dec.final
    rescue OpenSSL::Cipher::CipherError
      raise Chamber::Errors::DecryptionFailure,
            'A decryption error occurred. It was probably due to invalid key data.'
    end

    begin
      _unserialized_value = YAML.load(unencrypted_value)
    rescue TypeError
      unencrypted_value
    end
  end
end

.encrypt(_key, value, encryption_key) ⇒ Object 



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# File 'lib/chamber/encryption_methods/ssl.rb', line 6

def self.encrypt(_key, value, encryption_key)
  value = YAML.dump(value)
  cipher = OpenSSL::Cipher::Cipher.new('AES-128-CBC')
  cipher.encrypt
  symmetric_key = cipher.random_key
  iv = cipher.random_iv

  # encrypt all data with this key and iv
  encrypted_data = cipher.update(value) + cipher.final

  # encrypt the key with the public key
  encrypted_key = encryption_key.public_encrypt(symmetric_key)

  # assemble the resulting Base64 encoded data, the key
  Base64.strict_encode64(encrypted_key) + '#' +
  Base64.strict_encode64(iv) + '#' +
  Base64.strict_encode64(encrypted_data)
end