code: func (db *Database) GetEncrypterManager(transformedKey []byte) (*EncrypterManager, error) {
  	return NewEncrypterManager(
  		buildMasterKey(db, transformedKey),
  		db.Header.FileHeaders.EncryptionIV,
  	)
  }
docs: // GetEncrypterManager returns an EncryptManager based on the master key and EncryptionIV, or nil if the type is unsupported