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ActiveSupport::MessageEncryptor

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.

Constants

OpenSSLCipherError

Public Class Methods

new(secret, cipher = 'aes-256-cbc') click to toggle source
# File lib/active_support/message_encryptor.rb, line 15
def initialize(secret, cipher = 'aes-256-cbc')
  @secret = secret
  @cipher = cipher
end

Public Instance Methods

decrypt(encrypted_message) click to toggle source
# File lib/active_support/message_encryptor.rb, line 35
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) click to toggle source
# File lib/active_support/message_encryptor.rb, line 55
def decrypt_and_verify(value)
  decrypt(verifier.verify(value))
end
encrypt(value) click to toggle source
# File lib/active_support/message_encryptor.rb, line 20
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) click to toggle source
# File lib/active_support/message_encryptor.rb, line 51
def encrypt_and_sign(value)
  verifier.generate(encrypt(value))
end

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