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#include <jni.h>
#include <android/log.h>
#include <android/asset_manager.h>
#include <android/asset_manager_jni.h>
#include <openssl/ssl.h>
#include <openssl/asn1.h>
#include <openssl/bio.h>
#include <openssl/x509.h>
#include <openssl/x509_vfy.h>
#include <openssl/pem.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/conf.h>
#include <string.h>
static int verify_certificate_hostname(X509 *cert, char *hostname) {
  int                   extcount;
  int           success = 0;
  char                  name[256];
  X509_NAME             *subj;
  const char            *extstr;
  CONF_VALUE            *nval;
  X509_EXTENSION        *ext;
  X509V3_EXT_METHOD     *meth;
  STACK_OF(CONF_VALUE)  *val;
  void          *ext_internal;

  if ((extcount = X509_get_ext_count(cert)) > 0) {
    for (int i = 0; !success && i < extcount;  i++) {
      ext = X509_get_ext(cert, i);
      extstr = OBJ_nid2sn(OBJ_obj2nid(X509_EXTENSION_get_object(ext)));
      if (!strcasecmp(extstr, "subjectAltName")) {
        if (!(meth = X509V3_EXT_get(ext))) break;
        const unsigned char *data = ext->value->data;
    ext_internal = X509V3_EXT_d2i(ext);

    val = meth->i2v(meth, ext_internal, 0);
        for (int j = 0;  j < sk_CONF_VALUE_num(val);  j++) {
          nval = sk_CONF_VALUE_value(val, j);
          if (!strcasecmp(nval->name, "DNS") && !strcasecmp(nval->value, hostname)) {
            success = 1;
            break;
          }
        }
      }
    }
  }

  if (!success && (subj = X509_get_subject_name(cert)) && X509_NAME_get_text_by_NID(subj, NID_commonName, name, sizeof(name)) > 0) {
    name[sizeof(name) - 1] = '\0';
    if (!strcasecmp(name, hostname)) success = 1;
  }

  return success;
}