MessageEncryptor is a simple way to encrypt values which get stored somewhere you don’t trust.

The cipher text and initialization vector are base64 encoded and returned to you.

This can be used in situations similar to the MessageVerifier, but where you don’t want users to be able to determine the value of the payload.

Methods
D
E
N
Classes and Modules
Constants
OpenSSLCipherError = OpenSSL::Cipher.const_defined?(:CipherError) ? OpenSSL::Cipher::CipherError : OpenSSL::CipherError
Class Public methods
new(secret, cipher = 'aes-256-cbc')

Source: show | on GitHub 

# File activesupport/lib/active_support/message_encryptor.rb, line 16
def initialize(secret, cipher = 'aes-256-cbc')
  @secret = secret
  @cipher = cipher
end
Instance Public methods
decrypt(encrypted_message)

Source: show | on GitHub 

# File activesupport/lib/active_support/message_encryptor.rb, line 36
def decrypt(encrypted_message)
  cipher = new_cipher
  encrypted_data, iv = encrypted_message.split("--").map {|v| ActiveSupport::Base64.decode64(v)}

  cipher.decrypt
  cipher.key = @secret
  cipher.iv  = iv

  decrypted_data = cipher.update(encrypted_data)
  decrypted_data << cipher.final

  Marshal.load(decrypted_data)
rescue OpenSSLCipherError, TypeError
  raise InvalidMessage
end
decrypt_and_verify(value)

Source: show | on GitHub 

# File activesupport/lib/active_support/message_encryptor.rb, line 56
def decrypt_and_verify(value)
  decrypt(verifier.verify(value))
end
encrypt(value)

Source: show | on GitHub 

# File activesupport/lib/active_support/message_encryptor.rb, line 21
def encrypt(value)
  cipher = new_cipher
  # Rely on OpenSSL for the initialization vector
  iv = cipher.random_iv

  cipher.encrypt
  cipher.key = @secret
  cipher.iv  = iv

  encrypted_data = cipher.update(Marshal.dump(value))
  encrypted_data << cipher.final

  [encrypted_data, iv].map {|v| ActiveSupport::Base64.encode64s(v)}.join("--")
end
encrypt_and_sign(value)

Source: show | on GitHub 

# File activesupport/lib/active_support/message_encryptor.rb, line 52
def encrypt_and_sign(value)
  verifier.generate(encrypt(value))
end