Class: DaffyLib::CachingEncryptor

Inherits:
Object
  • Object
show all
Defined in:
lib/daffy_lib/caching_encryptor.rb

Defined Under Namespace

Classes: CachingEncryptorException, DecryptionFailedException, EncryptionFailedException, InvalidParameterException

Class Method Summary collapse

Class Method Details

.zt_decrypt(*args, &block) ⇒ Object 



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# File 'lib/daffy_lib/caching_encryptor.rb', line 40

def self.zt_decrypt(*args, &block)
  value, expires_in, cmk_key_id = validate_decrypt_params(*args)

  ciphertext_info = JSON.parse(value, symbolize_names: true)

  # Call the legacy decrypt function if there is no key_guid present
  return legacy_decrypt(*args, block) unless ciphertext_info.key?(:key_guid)

  key_guid = ciphertext_info[:key_guid]
  ciphertext = Base64.decode64(ciphertext_info[:data])
  nonce = Base64.decode64(ciphertext_info[:nonce])

  key_info = DaffyLib::EncryptionKey.find_by!(guid: key_guid)

  kms = DaffyLib::KeyManagementService.new(key_info.partition_guid, expires_in, cmk_key_id)
  plaintext_key = kms.retrieve_plaintext_key(key_info)

  PorkyLib::Symmetric.instance.decrypt_with_key(
    ciphertext,
    plaintext_key,
    nonce
  ).plaintext
rescue JSON::JSONError => e
  Rails.logger.error("JSON parse error on decryption: #{e.message}")

  raise DecryptionFailedException
rescue ActiveRecord::RecordNotFound => e
  Rails.logger.error("Failed to find encryption key for guid #{key_guid} on decrypt: #{e.message}")

  raise DecryptionFailedException
rescue DaffyLib::KeyManagementService::KeyManagementServiceException => e
  Rails.logger.error("KeyManagementService exception on decrypt: #{e.message}")

  raise DecryptionFailedException
rescue RbNaCl::CryptoError, RbNaCl::LengthError => e
  Rails.logger.error("RbNaCl exception on decrypt: #{e.message}")

  raise DecryptionFailedException
end

.zt_encrypt(*args, &_block) ⇒ Object 



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# File 'lib/daffy_lib/caching_encryptor.rb', line 9

def self.zt_encrypt(*args, &_block)
  data, partition_guid, encryption_epoch, expires_in, cmk_key_id = validate_encrypt_params(*args)

  kms = DaffyLib::KeyManagementService.new(partition_guid, expires_in, cmk_key_id)

  key_info = kms.find_or_create_encryption_key(encryption_epoch)

  plaintext_key = kms.retrieve_plaintext_key(key_info)

  encryption_result = PorkyLib::Symmetric.instance.encrypt_with_key(data, plaintext_key)

  # The value returned from this method is stored in the encrypted_{attr} field in the DB, but there isn't a way to tell the attr_encrypted library
  # the value of the nonce/IV to store or the value of the encryption key to store. As a result, we will store a JSON object as the encrypted_{attr},
  # with the raw byte values Base64 encoded.
  {
    key_guid: key_info.guid,
    # Store this with the data in case we need to decrypt outside the platform
    key: key_info.encrypted_data_encryption_key,
    data: Base64.encode64(encryption_result.ciphertext),
    nonce: Base64.encode64(encryption_result.nonce)
  }.to_json
rescue DaffyLib::KeyManagementService::KeyManagementServiceException => e
  Rails.logger.error("KeyManagementService exception on encrypt: #{e.message}")

  raise EncryptionFailedException
rescue RbNaCl::CryptoError, RbNaCl::LengthError => e
  Rails.logger.error("RbNaCl exception on encrypt: #{e.message}")

  raise EncryptionFailedException
end