key_vault.h

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#pragma once
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <stdint.h>
 
#include "ra8_err.h"

typedef enum : uint16_t {
  k_ra8_key_vault_slots         = 8U,  
  k_ra8_key_vault_key_bytes     = 32U, 
  k_ra8_key_vault_chal_bytes    = 32U, 
  k_ra8_key_vault_digest_bytes  = 32U, 
  k_ra8_key_vault_mac_key_bytes = 32U, 
} ra8_key_vault_limits_t;

[[nodiscard]] ra8_err_t ra8_key_vault_init(void);

[[nodiscard]] ra8_err_t ra8_key_vault_store(uint16_t slot, const uint8_t* key);

[[nodiscard]] ra8_err_t
ra8_key_vault_sha256_xor_challenge(uint16_t slot, const uint8_t* challenge, uint8_t* out);

[[nodiscard]] ra8_err_t ra8_key_vault_set_mac_key(const uint8_t* key, uint16_t key_len);

[[nodiscard]] ra8_err_t
ra8_key_vault_load_mac_key(uint8_t* out, uint16_t out_cap, uint16_t* out_len);
 
#ifdef __cplusplus
}
#endif