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Class: ActiveRecord::Encryption::KeyProvider

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Subclasses:
DerivedSecretKeyProvider, DeterministicKeyProvider
Inherits: Object
Defined in: activerecord/lib/active_record/encryption/key_provider.rb

Overview

A KeyProvider serves keys:

  • An encryption key

  • A list of potential decryption keys. Serving multiple decryption keys supports rotation-schemes where new keys are added but old keys need to continue working

Class Method Summary

Instance Method Summary

Constructor Details

.new(keys) ⇒ KeyProvider

[ GitHub ] 

  


# File 'activerecord/lib/active_record/encryption/key_provider.rb', line 11



def initialize(keys)
  @keys = Array(keys)
end


  







Instance Method Details



  

    #decryption_keys(encrypted_message)  
  



  

    

Returns the list of decryption keys



When the message holds a reference to its encryption key, it will return an array with that key. If not, it will return the list of keys.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/encryption/key_provider.rb', line 32



def decryption_keys(encrypted_message)
  if encrypted_message.headers.encrypted_data_key_id
    keys_grouped_by_id[encrypted_message.headers.encrypted_data_key_id]
  else
    @keys
  end
end


  








  

    #encryption_key  
  



  

    

Returns the last key in the list as the active key to perform encryptions



When ActiveRecord::Encryption.config.store_key_references is true, the key will include a public tag referencing the key itself. That key will be stored in the public headers of the encrypted message


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/encryption/key_provider.rb', line 20



def encryption_key
  @encryption_key ||= @keys.last.tap do |key|
    key.public_tags.encrypted_data_key_id = key.id if ActiveRecord::Encryption.config.store_key_references
  end

  @encryption_key
end


  








  

    #keys_grouped_by_id   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/encryption/key_provider.rb', line 41



def keys_grouped_by_id
  @keys_grouped_by_id ||= @keys.group_by(&:id)
end