e_useless.c

#include <stdio.h>
#include <string.h>

#include <openssl/engine.h>

static const char *engine_id = "useless";
static const char *engine_name = "A useless engine for demonstration purposes";

static int bind(ENGINE *e, const char *id)
{
  static int loaded = 0;
  int ret = 0;

  if (id && strcmp(id, engine_id)) {
    goto end;
  }

  if (loaded) {
    fprintf(stderr, "Useless engine already loaded\n");
    goto end;
  }

  loaded = 1;

  if (!ENGINE_set_id(e, engine_id)) {
    fprintf(stderr, "ENGINE_set_id failed\n");
    goto end;
  }
  if (!ENGINE_set_name(e, engine_name)) {
    printf("ENGINE_set_name failed\n");
    goto end;
  }

    ret = 1;
 end:
    return ret;
}

IMPLEMENT_DYNAMIC_BIND_FN(bind)
IMPLEMENT_DYNAMIC_CHECK_FN()