char *img4_decrypt_bytes (image4_t *img, char *key)
{

    char *tag = asn1ElementAtIndex (img->buf, 3) + 1;
    asn1ElemLen_t len = asn1Len (tag);
    unsigned char *data = (unsigned char *)tag + len.sizeBytes;

    size_t tst = 0;

    if (img->size % BLOCK_SIZE) {
        tst = img->size + (BLOCK_SIZE - (img->size % BLOCK_SIZE)) + BLOCK_SIZE;
    }

    g_print ("imgsize: %zu, blocksize: %zu, newimgsize: %d\n", img->size, tst, BLOCK_SIZE);
    img->size = tst;

    unsigned char *out = malloc (img->size);

    unsigned char *iv = (unsigned char *)"1ef67798a0c53116a47145dfff0aac60";
    const unsigned char *k = (unsigned char *)"9a6ddfb9f432a971be8ae360c6ce0a8e3170f372d4e3158bb04e61d81798929f";

    AES_KEY dec_key;
    AES_set_encrypt_key (k, sizeof(k) * 8, &dec_key);
    AES_cbc_encrypt (data, out, sizeof (img->buf), &dec_key, iv, AES_DECRYPT);

    return (char *) out;

    /*asn1ElemLen_t len = asn1Len (tag);
    char *data = tag + len.sizeBytes;

    img->buf = data + len.dataLen;

    char *iv = "1ef67798a0c53116a47145dfff0aac60";
    char *akey = "9a6ddfb9f432a971be8ae360c6ce0a8e3170f372d4e3158bb04e61d81798929f";

    unsigned char *newbuf = malloc (img->size);

    char *test = "Hello World";
    g_print ("normal: %s | unsigned: %s\n", test, (unsigned char *)test);

    unsigned char local_vec [AES_BLOCK_SIZE];
    memcpy (local_vec, iv, AES_BLOCK_SIZE);

    AES_KEY dec_key;

    AES_set_decrypt_key ((unsigned char *)akey, sizeof(akey)*8, &dec_key);

    AES_cbc_encrypt ((const unsigned char *)img->buf, newbuf, img->size,
                    &dec_key, local_vec, AES_DECRYPT);

    return (char *)newbuf;*/
}