sha256.h

#ifndef SHA256_H__
#define SHA256_H__

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

#define SHA256_MAC_LEN 32


// DBL_INT_ADD treats two unsigned ints a and b as one 64-bit integer and adds c to it
#define DBL_INT_ADD(a,b,c) if (a > 0xffffffff - (c)) ++b; a += c;
#define ROTLEFT(a,b) (((a) << (b)) | ((a) >> (32-(b))))
#define ROTRIGHT(a,b) (((a) >> (b)) | ((a) << (32-(b))))

#define CH(x,y,z) (((x) & (y)) ^ (~(x) & (z)))
#define MAJ(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
#define EP0(x) (ROTRIGHT(x,2) ^ ROTRIGHT(x,13) ^ ROTRIGHT(x,22))
#define EP1(x) (ROTRIGHT(x,6) ^ ROTRIGHT(x,11) ^ ROTRIGHT(x,25))
#define SIG0(x) (ROTRIGHT(x,7) ^ ROTRIGHT(x,18) ^ ((x) >> 3))
#define SIG1(x) (ROTRIGHT(x,17) ^ ROTRIGHT(x,19) ^ ((x) >> 10))

typedef struct {
   uint8_t data[64];
   uint32_t datalen;
   uint32_t bitlen[2];
   uint32_t state[8];
} SHA256_CTX;


void sha256_vector(size_t num_elem,  uint8_t *addr[],  size_t *len,
         uint8_t *mac);

void sha256_transform(SHA256_CTX *ctx, uint8_t data[]);
void sha256_init(SHA256_CTX *ctx);
void sha256_update(SHA256_CTX *ctx, uint8_t data[], uint32_t len);
void sha256_final(SHA256_CTX *ctx, uint8_t hash[]);
void hmac_sha256_vector( uint8_t *key, size_t key_len, size_t num_elem,
             uint8_t *addr[],  size_t *len, uint8_t *mac);
void hmac_sha256( uint8_t *key, size_t key_len,  uint8_t *data,
         size_t data_len, uint8_t *mac);
void sha256_vector(size_t num_elem,  uint8_t *addr[],  size_t *len,
         uint8_t *mac);

uint32_t sha256_32_vector(size_t num_elem, uint8_t *addr[],  size_t *len);
int sha256_file(const char *file, uint8_t *mac);
int sha256_32_file(const char *file, uint32_t *nid);

#endif