/**
 * @file se050_hmac_blake2s.h
 * @brief HMAC-BLAKE2s Implementation (RFC 2104)
 */

#ifndef SE050_HMAC_BLAKE2S_H
#define SE050_HMAC_BLAKE2S_H

#include <stdint.h>
#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

#define HMAC_BLAKE2S_BLOCK_SIZE 64
#define HMAC_BLAKE2S_DIGEST_SIZE 32

/**
 * @brief Compute HMAC-BLAKE2s
 * @param out Output buffer (32 bytes)
 * @param key Key data
 * @param keylen Key length (1-64 bytes)
 * @param data Input data
 * @param datalen Input data length
 * @return 0 on success, -1 on error
 */
int se050_hmac_blake2s(uint8_t out[32],
                       const uint8_t *key, size_t keylen,
                       const uint8_t *data, size_t datalen);

/**
 * @brief One-shot HMAC-BLAKE2s with variable output length
 * @param out Output buffer
 * @param outlen Output length (1-32 bytes)
 * @param key Key data
 * @param keylen Key length
 * @param data Input data
 * @param datalen Input data length
 * @return 0 on success, -1 on error
 */
int se050_hmac_blake2s_variable(uint8_t *out, size_t outlen,
                                const uint8_t *key, size_t keylen,
                                const uint8_t *data, size_t datalen);

#ifdef __cplusplus
}
#endif

#endif /* SE050_HMAC_BLAKE2S_H */