#ifndef SHA256_H
#define SHA256_H

#include <inttypes.h>

#define SHA256_HASH_SIZE 32  /* 256 bit */
#define SHA256_HASH_WORDS 8

struct _SHA256Context {
  uint64_t totalLength;
  uint32_t hash[SHA256_HASH_WORDS];
  uint32_t bufferLength;
  union {
    uint32_t words[16];
    uint8_t bytes[64];
  } buffer;
};
typedef struct _SHA256Context SHA256Context;

void SHA256Init (SHA256Context *sc);
void SHA256Update (SHA256Context *sc, const void *data, uint32_t len);
void SHA256Final (SHA256Context *sc, uint8_t hash[SHA256_HASH_SIZE]);

#endif /* SHA256_H */