sha256.h

#ifndef SHA256_H
#define SHA256_H

const static unsigned int SHA256_INITIAL_HASH[8] = {
    0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};

const static unsigned int SHA256_K[64] = {
    0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
    0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
    0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
    0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
    0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
    0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
    0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
    0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};

#define ROTR_32(x, n) ((x >> n) | (x << (32 - n)))

#define SHR(x, n) (x >> n)

#define Ch(x, y, z) ((x & y) ^ (~x & z))

#define Maj(x, y, z) ((x & y) ^ (x & z) ^ (y & z))

#define SIGMA0(x) (ROTR_32(x, 2) ^ ROTR_32(x, 13) ^ ROTR_32(x, 22))

#define SIGMA1(x) (ROTR_32(x, 6) ^ ROTR_32(x, 11) ^ ROTR_32(x, 25))

#define sigma0(x) (ROTR_32(x, 7) ^ ROTR_32(x, 18) ^ SHR(x, 3))

#define sigma1(x) (ROTR_32(x, 17) ^ ROTR_32(x, 19) ^ SHR(x, 10))

#define SHA256_BLOCK_SIZE 64

#define SHA256_WORD_SIZE 8

typedef struct _sha256context
{
    unsigned long long bits;
    unsigned int H[SHA256_WORD_SIZE];
    unsigned char buf[SHA256_BLOCK_SIZE];
} sha256context[1];

void sha256_init(sha256context);

void sha256_write(sha256context, const char *, size_t);

void sha256_update(sha256context);

void sha256_finish(sha256context, unsigned char *);

void hmac_sha256(unsigned char *, char *, size_t, char *, size_t);

void sha256context_dump(sha256context);

void hextobs(unsigned char *, const char *);

void print_h(const unsigned char *, size_t);

void sprint_h(char *, const unsigned char *, size_t);

#endif