#ifndef API_H#define API_H#define CRYPTO_KEYBYTES 16 // Size of the key in bytes.#define CRYPTO_NSECBYTES 0 // UNUSED#define CRYPTO_NPUBBYTES 13 // Size of the nonce in bytes.#define CRYPTO_ABYTES 16 // Ciphertext expansion is one block, always.#define CRYPTO_NOOVERLAP 1 // Shall be set to one.#endif