/*===========================================================================
                    Combined Charging System (CCS): SECC
                                 NidNmk.h

                        initiated by Vern, Joseph
                           (since 2019/07/19)
=============================================================================*/

#include <stdint.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

typedef struct sha256
{

    uint32_t count [2];
    uint32_t state [8];
    uint8_t block [64];
    uint8_t extra [64];

} SHA256;

#define SHA256_DIGEST_LENGTH 256 / 8
#define HPAVKEY_NMK_LEN 16
#define HPAVKEY_NID_LEN 7
#define SHR(word, bits) ((word & 0xFFFFFFFF) >> bits)
#define ROTR(word, bits) (SHR(word, bits) | (word << (32 - bits)))
#define DEFAULT_LEVEL 0
//--------------------------------------------------------------------------
/* Functions -----------------------------------------------------------*/
//--------------------------------------------------------------------------
void HPAVKeyNMK(uint8_t NMK [], const char *string);
void HPAVKeyNID(uint8_t NID [], const uint8_t NMK [], uint8_t level);
void SHA256Reset(struct sha256 *sha256);
void SHA256Block(struct sha256 *sha256, void const *memory);
void SHA256Write(struct sha256 *sha256, void const *memory, uint16_t extent);
void SHAEncode(uint8_t memory [], uint32_t number);
void SHA256Fetch(struct sha256 *sha256, uint8_t digest []);