SHA256.h

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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 */
#include <cstdint>
#ifdef __cplusplus
extern "C"
{
#endif
typedef uint8_t ulong8;
typedef uint32_t ulong32;
typedef uint64_t ulong64;
 
struct sha256_state {
    ulong64 length;
    ulong32 state[8], curlen;
    unsigned char buf[64];
};
 
/* error codes [will be expanded in future releases] */
enum
{
  CRYPT_OK = 0,           /* Result OK */
  CRYPT_FAIL_TESTVECTOR,  /* Algorithm failed test vectors */
  CRYPT_INVALID_ARG,      /* Generic invalid argument */
  CRYPT_HASH_OVERFLOW      /* Hash applied to too many bits */
};
 
typedef union Hash_state
{
  struct sha256_state sha256;
  void* data;
} hash_state;
 
int sha256_init(hash_state* md);
int sha256_process(hash_state* md, const ulong8* in, ulong32 inlen);
int sha256_done(hash_state* md, ulong8* hash);
#ifdef __cplusplus
}
#endif