mac.h

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#ifndef SAFECOMM_MAC_H
#define SAFECOMM_MAC_H
 
#include <stddef.h>
#include <stdint.h>
 
#include "safecomm/status.h"
 
#ifdef __cplusplus
extern "C" {
#endif

#define SAFECOMM_MAC_KEY_LEN 24U
#define SAFECOMM_MAC_LEN 8U
#define SAFECOMM_MAC_RAND_LEN 8U

typedef enum
{
    SAFECOMM_MAC_ALG_3DES_SS037 = 0 
} safecomm_mac_alg_t;

typedef struct
{
    uint8_t ksmac[SAFECOMM_MAC_KEY_LEN]; 
    safecomm_mac_alg_t alg;              
} safecomm_mac_ctx_t;

safecomm_status_t safecomm_mac_derive_ksmac(const uint8_t kmac[SAFECOMM_MAC_KEY_LEN],
                                            const uint8_t ra[SAFECOMM_MAC_RAND_LEN],
                                            const uint8_t rb[SAFECOMM_MAC_RAND_LEN],
                                            safecomm_mac_ctx_t *out_ctx);

safecomm_status_t safecomm_mac_compute(const safecomm_mac_ctx_t *ctx,
                                       const uint8_t *msg, size_t msg_len,
                                       uint8_t out_mac[SAFECOMM_MAC_LEN]);

safecomm_status_t safecomm_mac_verify(const safecomm_mac_ctx_t *ctx,
                                      const uint8_t *msg, size_t msg_len,
                                      const uint8_t rx_mac[SAFECOMM_MAC_LEN]);
 
#ifdef __cplusplus
}
#endif
 
#endif /* SAFECOMM_MAC_H */