PROBLEMS READ PUBLIC KEY

[Lidia]

Hi !
I need read a public key from pem file (this file content ONLY the public key). 
This public key can be RSA,DSA....... For this reason i try use:

EVP_PKEY *clave_publica=NULL;
clave_publica = EVP_PKEY_new();

int  lee_clave_publica(char *fichero_publica)
{
    BIO *bp_publica;
    OpenSSL_add_all_algorithms(); 
    SSLeay_add_all_algorithms();

    bp_publica=BIO_new(BIO_s_file());
   
    if (BIO_read_filename(bp_publica,fichero_publica) <= 0)
     {
            printf("ERROR");
            BIO_free(bp_publica);
            return 0;
     }
   
   if ((clave_publica=PEM_read_bio_PUBKEY(bp_publica,NULL,0,NULL)==NULL)  
                /*Always clave_publica==NULL !!!!!!!!!!!!!*/
   {
        printf("ERROR"); 
        BIO_free(bp_publica);
        return 0;
    }
    
   BIO_free(bp_publica);
   return 1;  
}

Finally in the main function when I finish my work , I write: 
EVP_PKEY_free(clave_publica);

But always the pem_read_bio_pubkey return null
Can anybody help me?
Thanks,
lidia

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