#include <string.h>

#include <sodium/crypto_hash_sha512.h>
#include <sodium/crypto_sign_ed25519.h>
#include "ref10/sign_ed25519_ref10.h"

size_t
crypto_sign_ed25519ph_statebytes(void)
{
  return sizeof(crypto_sign_ed25519ph_state);
}

size_t
crypto_sign_ed25519_bytes(void)
{
  return crypto_sign_ed25519_BYTES;
}

size_t
crypto_sign_ed25519_seedbytes(void)
{
  return crypto_sign_ed25519_SEEDBYTES;
}

size_t
crypto_sign_ed25519_publickeybytes(void)
{
  return crypto_sign_ed25519_PUBLICKEYBYTES;
}

size_t
crypto_sign_ed25519_secretkeybytes(void)
{
  return crypto_sign_ed25519_SECRETKEYBYTES;
}

size_t
crypto_sign_ed25519_messagebytes_max(void)
{
  return crypto_sign_ed25519_MESSAGEBYTES_MAX;
}

int
crypto_sign_ed25519_sk_to_seed(unsigned char *seed, const unsigned char *sk)
{
  memmove(seed, sk, crypto_sign_ed25519_SEEDBYTES);

  return 0;
}

int
crypto_sign_ed25519_sk_to_pk(unsigned char *pk, const unsigned char *sk)
{
  memmove(pk, sk + crypto_sign_ed25519_SEEDBYTES,
          crypto_sign_ed25519_PUBLICKEYBYTES);
  return 0;
}

int
crypto_sign_ed25519ph_init(crypto_sign_ed25519ph_state *state)
{
  crypto_hash_sha512_init(&state->hs);
  return 0;
}

int
crypto_sign_ed25519ph_update(crypto_sign_ed25519ph_state *state,
                             const unsigned char *m, unsigned long long mlen)
{
  return crypto_hash_sha512_update(&state->hs, m, mlen);
}

int
crypto_sign_ed25519ph_final_create(crypto_sign_ed25519ph_state *state,
                                   unsigned char *sig,
                                   unsigned long long *siglen_p,
                                   const unsigned char *sk)
{
  unsigned char ph[crypto_hash_sha512_BYTES];

  crypto_hash_sha512_final(&state->hs, ph);

  return _crypto_sign_ed25519_detached(sig, siglen_p, ph, sizeof ph, sk, 1);
}

int
crypto_sign_ed25519ph_final_verify(crypto_sign_ed25519ph_state *state,
                                   unsigned char *sig, const unsigned char *pk)
{
  unsigned char ph[crypto_hash_sha512_BYTES];

  crypto_hash_sha512_final(&state->hs, ph);

  return _crypto_sign_ed25519_verify_detached(sig, ph, sizeof ph, pk, 1);
}