#ifndef L2SU_DIGEST_H_INCLUDED
#define L2SU_DIGEST_H_INCLUDED

#include <stdint.h>
#include <stddef.h>

#include "macros.h"

#define L2_SHA1__BLOCKLEN (64) /* 512 / 8 = 64 */
#define L2_SHA1__DIGESTLEN (5) /* 160 / 32 = 5 */

#define L2_SHA1_HEX_STRLEN (40)
#define L2_SHA1_DIGEST_BYTES (20)

typedef struct tag_l2_sha1_state {
  /* struct members are internal do not use directly */
  uint32_t state[L2_SHA1__DIGESTLEN];
  uint8_t chunk[L2_SHA1__BLOCKLEN];
  size_t nchunk;
  uint64_t totallen;
} l2_sha1_state_t;

typedef struct tag_l2_sha1_digest {
  uint32_t state[L2_SHA1__DIGESTLEN];
} l2_sha1_digest_t;

void l2_sha1_init(l2_sha1_state_t *st);
void l2_sha1_update(l2_sha1_state_t *st, const void *data, size_t sz);
void l2_sha1_finalize(l2_sha1_state_t *st, l2_sha1_digest_t *digest);

int l2_sha1_digest_compare(const l2_sha1_digest_t *d1, const l2_sha1_digest_t *d2);
void l2_sha1_digest_copy(l2_sha1_digest_t *L2_RESTRICT dest, const l2_sha1_digest_t *L2_RESTRICT src);
void l2_sha1_digest_to_hex(const l2_sha1_digest_t *dg, char *out);
int l2_sha1_digest_from_hex(l2_sha1_digest_t *dg, const char *in);

void l2_sha1_digest_to_buffer(const l2_sha1_digest_t *dg, void *odata);
void l2_sha1_digest_from_buffer(l2_sha1_digest_t *dg, const void *data);

#endif /* include guard */