C++ (Cpp) bignum_ctx_new示例

示例#1

文件： dh.c 项目： mwgoldsmith/ssh

int dh_generate_f(ssh_session session) {
#ifdef HAVE_LIBCRYPTO
  bignum_CTX ctx = bignum_ctx_new();
  if (ctx == NULL) {
    return -1;
  }
#endif

  session->next_crypto->f = bignum_new();
  if (session->next_crypto->f == NULL) {
#ifdef HAVE_LIBCRYPTO
    bignum_ctx_free(ctx);
#endif
    return -1;
  }

#ifdef HAVE_LIBGCRYPT
  bignum_mod_exp(session->next_crypto->f, g, session->next_crypto->y,
      select_p(session->next_crypto->kex_type));
#elif defined HAVE_LIBCRYPTO
  bignum_mod_exp(session->next_crypto->f, g, session->next_crypto->y,
      select_p(session->next_crypto->kex_type), ctx);
#endif

#ifdef DEBUG_CRYPTO
  ssh_print_bignum("f", session->next_crypto->f);
#endif

#ifdef HAVE_LIBCRYPTO
  bignum_ctx_free(ctx);
#endif

  return 0;
}

示例#2

文件： dh.c 项目： ToThePradoHotel/libssh

/* used by server */
int dh_generate_e(ssh_session session) {
#ifdef HAVE_LIBCRYPTO
  bignum_CTX ctx = bignum_ctx_new();
  if (ctx == NULL) {
    return -1;
  }
#endif

  session->next_crypto->e = bignum_new();
  if (session->next_crypto->e == NULL) {
#ifdef HAVE_LIBCRYPTO
    bignum_ctx_free(ctx);
#endif
    return -1;
  }

#ifdef HAVE_LIBGCRYPT
  bignum_mod_exp(session->next_crypto->e, g, session->next_crypto->x, p);
#elif defined HAVE_LIBCRYPTO
  bignum_mod_exp(session->next_crypto->e, g, session->next_crypto->x, p, ctx);
#endif

#ifdef DEBUG_CRYPTO
  ssh_print_bignum("e", session->next_crypto->e);
#endif

#ifdef HAVE_LIBCRYPTO
  bignum_ctx_free(ctx);
#endif

  return 0;
}

示例#3

文件： dh.c 项目： mwgoldsmith/ssh

int dh_build_k(ssh_session session) {
#ifdef HAVE_LIBCRYPTO
  bignum_CTX ctx = bignum_ctx_new();
  if (ctx == NULL) {
    return -1;
  }
#endif

  session->next_crypto->k = bignum_new();
  if (session->next_crypto->k == NULL) {
#ifdef HAVE_LIBCRYPTO
    bignum_ctx_free(ctx);
#endif
    return -1;
  }

    /* the server and clients don't use the same numbers */
#ifdef HAVE_LIBGCRYPT
  if(session->client) {
    bignum_mod_exp(session->next_crypto->k, session->next_crypto->f,
        session->next_crypto->x, select_p(session->next_crypto->kex_type));
  } else {
    bignum_mod_exp(session->next_crypto->k, session->next_crypto->e,
        session->next_crypto->y, select_p(session->next_crypto->kex_type));
  }
#elif defined HAVE_LIBCRYPTO
  if (session->client) {
    bignum_mod_exp(session->next_crypto->k, session->next_crypto->f,
        session->next_crypto->x, select_p(session->next_crypto->kex_type), ctx);
  } else {
    bignum_mod_exp(session->next_crypto->k, session->next_crypto->e,
        session->next_crypto->y, select_p(session->next_crypto->kex_type), ctx);
  }
#endif

#ifdef DEBUG_CRYPTO
    ssh_print_hexa("Session server cookie",
                   session->next_crypto->server_kex.cookie, 16);
    ssh_print_hexa("Session client cookie",
                   session->next_crypto->client_kex.cookie, 16);
    ssh_print_bignum("Shared secret key", session->next_crypto->k);
#endif

#ifdef HAVE_LIBCRYPTO
  bignum_ctx_free(ctx);
#endif

  return 0;
}

示例#4

文件： ecdh.c 项目： MarvinZhuang/tmate

static int ecdh_build_k(ssh_session session) {
  const EC_GROUP *group = EC_KEY_get0_group(session->next_crypto->ecdh_privkey);
  EC_POINT *pubkey;
  void *buffer;
  int len = (EC_GROUP_get_degree(group) + 7) / 8;
  bignum_CTX ctx = bignum_ctx_new();
  if (ctx == NULL) {
    return -1;
  }

  session->next_crypto->k = bignum_new();
  if (session->next_crypto->k == NULL) {
    bignum_ctx_free(ctx);
    return -1;
  }

  pubkey = EC_POINT_new(group);
  if (pubkey == NULL) {
    bignum_ctx_free(ctx);
    return -1;
  }

  if (session->server)
      EC_POINT_oct2point(group,pubkey,ssh_string_data(session->next_crypto->ecdh_client_pubkey),
              ssh_string_len(session->next_crypto->ecdh_client_pubkey),ctx);
  else
      EC_POINT_oct2point(group,pubkey,ssh_string_data(session->next_crypto->ecdh_server_pubkey),
              ssh_string_len(session->next_crypto->ecdh_server_pubkey),ctx);
  buffer = malloc(len);
  ECDH_compute_key(buffer,len,pubkey,session->next_crypto->ecdh_privkey,NULL);
  EC_POINT_free(pubkey);
  BN_bin2bn(buffer,len,session->next_crypto->k);
  free(buffer);
  EC_KEY_free(session->next_crypto->ecdh_privkey);
  session->next_crypto->ecdh_privkey=NULL;
#ifdef DEBUG_CRYPTO
    ssh_print_hexa("Session server cookie",
                   session->next_crypto->server_kex.cookie, 16);
    ssh_print_hexa("Session client cookie",
                   session->next_crypto->client_kex.cookie, 16);
    ssh_print_bignum("Shared secret key", session->next_crypto->k);
#endif

#ifdef HAVE_LIBCRYPTO
  bignum_ctx_free(ctx);
#endif

  return 0;
}