#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/aes.h>
int openssl_hmac_vector(const EVP_MD *type, const u8 *key,
               size_t key_len, size_t num_elem,
               const u8 *addr[], const size_t *len, u8 *mac,
               unsigned int mdlen)
{
    HMAC_CTX ctx;
    size_t i;
    int res;

    HMAC_CTX_init(&ctx);
 #if OPENSSL_VERSION_NUMBER < 0x00909000
    HMAC_Init_ex(&ctx, key, key_len, type, NULL);
 #else /* openssl < 0.9.9 */
    if (HMAC_Init_ex(&ctx, key, key_len, type, NULL) != 1)
       return -1;
  #endif /* openssl < 0.9.9 */

   for (i = 0; i < num_elem; i++)
       HMAC_Update(&ctx, addr[i], len[i]);

  #if OPENSSL_VERSION_NUMBER < 0x00909000
      HMAC_Final(&ctx, mac, &mdlen);
     res = 1;
  #else /* openssl < 0.9.9 */
     res = HMAC_Final(&ctx, mac, &mdlen);
  #endif /* openssl < 0.9.9 */
     HMAC_CTX_cleanup(&ctx);

    return res == 1 ? 0 : -1;
  }

Error   12  error LNK2001: unresolved external symbol _HMAC_CTX_cleanup@4
Error   13  error LNK2001: unresolved external symbol _HMAC_Final@12
Error   15  error LNK2001: unresolved external symbol _HMAC_Init_ex@20
Error   16  error LNK2001: unresolved external symbol _HMAC_CTX_init@4