#include <inttypes.h>

#define HASH_LENGTH 20
#define BLOCK_LENGTH 64

union _buffer {
  uint8_t b[BLOCK_LENGTH];
  uint32_t w[BLOCK_LENGTH/4];
} buffer;
union _state {
  uint8_t b[HASH_LENGTH];
  uint32_t w[HASH_LENGTH/4];
} state;

uint8_t bufferOffset;
uint32_t byteCount;
uint8_t keyBuffer[BLOCK_LENGTH];
uint8_t innerHash[HASH_LENGTH];

void init(void);
void initHmac(const uint8_t* secret, uint8_t secretLength);
uint8_t* result(void);
uint8_t* resultHmac(void);
void write(uint8_t);
void writeArray(uint8_t *buffer, uint8_t size);