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#ifndef HYBBX_AES256GCM_H
#define HYBBX_AES256GCM_H
#include <stddef.h>
#include <stdint.h>
#define HYBBX_AES256GCM_KEY_SIZE 32
#define HYBBX_AES256GCM_NONCE_SIZE 12
#define HYBBX_AES256GCM_TAG_SIZE 16
/**
* AES-256-GCM encrypt. @p ciphertext length equals @p plaintext_len.
* @p tag receives the 16-byte authentication tag.
*/
int hybbx_aes256gcm_encrypt(const uint8_t key[HYBBX_AES256GCM_KEY_SIZE],
const uint8_t nonce[HYBBX_AES256GCM_NONCE_SIZE],
const uint8_t *aad, size_t aad_len,
const uint8_t *plaintext, size_t plaintext_len,
uint8_t *ciphertext,
uint8_t tag[HYBBX_AES256GCM_TAG_SIZE]);
/**
* AES-256-GCM decrypt. Returns 0 on success (tag valid), -1 on failure.
*/
int hybbx_aes256gcm_decrypt(const uint8_t key[HYBBX_AES256GCM_KEY_SIZE],
const uint8_t nonce[HYBBX_AES256GCM_NONCE_SIZE],
const uint8_t *aad, size_t aad_len,
const uint8_t *ciphertext, size_t ciphertext_len,
uint8_t *plaintext,
const uint8_t tag[HYBBX_AES256GCM_TAG_SIZE]);
#endif
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