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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

Methods
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Class Public methods

new(keys)

Source: show | on GitHub 

# File activerecord/lib/active_record/encryption/key_provider.rb, line 11
def initialize(keys)
  @keys = Array(keys)
end

Instance Public methods

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.

Source: show | on 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

Source: show | on 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