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#ifndef SHA256_H
#define SHA256_H
class SHA256
{
protected:
typedef unsigned char uint8;
typedef unsigned int uint32;
typedef unsigned long long uint64;
const static uint32 sha256_k[];
static const unsigned int SHA224_256_BLOCK_SIZE = (512 / 8);
public:
void init();
void update(const unsigned char* message, unsigned int len);
void final(unsigned char* digest);
static const unsigned int DIGEST_SIZE = (256 / 8);
protected:
void transform(const unsigned char* message, unsigned int block_nb);
unsigned int m_tot_len;
unsigned int m_len;
unsigned char m_block[2 * SHA224_256_BLOCK_SIZE];
uint32 m_h[8];
};
std::string sha256(std::string input);
#define SHA2_SHFR(x, n) (x >> n)
#define SHA2_ROTR(x, n) ((x >> n) | (x << ((sizeof(x) << 3) - n)))
#define SHA2_ROTL(x, n) ((x << n) | (x >> ((sizeof(x) << 3) - n)))
#define SHA2_CH(x, y, z) ((x & y) ^ (~x & z))
#define SHA2_MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
#define SHA256_F1(x) (SHA2_ROTR(x, 2) ^ SHA2_ROTR(x, 13) ^ SHA2_ROTR(x, 22))
#define SHA256_F2(x) (SHA2_ROTR(x, 6) ^ SHA2_ROTR(x, 11) ^ SHA2_ROTR(x, 25))
#define SHA256_F3(x) (SHA2_ROTR(x, 7) ^ SHA2_ROTR(x, 18) ^ SHA2_SHFR(x, 3))
#define SHA256_F4(x) (SHA2_ROTR(x, 17) ^ SHA2_ROTR(x, 19) ^ SHA2_SHFR(x, 10))
#define SHA2_UNPACK32(x, str) \
{ \
*((str) + 3) = (uint8)((x)); \
*((str) + 2) = (uint8)((x) >> 8); \
*((str) + 1) = (uint8)((x) >> 16); \
*((str) + 0) = (uint8)((x) >> 24); \
}
#define SHA2_PACK32(str, x) \
{ \
*(x) = ((uint32) * ((str) + 3)) | ((uint32) * ((str) + 2) << 8) | ((uint32) * ((str) + 1) << 16) | ((uint32) * ((str) + 0) << 24); \
}
#endif
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