@type t() ::
  integer()
  | :CRYPTO_ALGORITHM_FUNCTION_UNSPECIFIED
  | :CRYPTO_ALGORITHM_FUNCTION_UNKNOWN
  | :CRYPTO_ALGORITHM_FUNCTION_OTHER
  | :CRYPTO_ALGORITHM_FUNCTION_GENERATE
  | :CRYPTO_ALGORITHM_FUNCTION_KEYGEN
  | :CRYPTO_ALGORITHM_FUNCTION_ENCRYPT
  | :CRYPTO_ALGORITHM_FUNCTION_DECRYPT
  | :CRYPTO_ALGORITHM_FUNCTION_DIGEST
  | :CRYPTO_ALGORITHM_FUNCTION_TAG
  | :CRYPTO_ALGORITHM_FUNCTION_KEYDERIVE
  | :CRYPTO_ALGORITHM_FUNCTION_SIGN
  | :CRYPTO_ALGORITHM_FUNCTION_VERIFY
  | :CRYPTO_ALGORITHM_FUNCTION_ENCAPSULATE
  | :CRYPTO_ALGORITHM_FUNCTION_DECAPSULATE