Hi,
I built a test code to fetch the custom information from X509_add_ext().
The test codes are as following:
---------------- codes for fetching extension --------
static char *get_distribution_point(X509 *cert) {
int extcount, i, j;
const char *extstr;
CONF_VALUE *nval;
unsigned char *data;
X509_EXTENSION *ext;
X509V3_EXT_METHOD *meth;
STACK_OF(CONF_VALUE) *val;
void *ext_str = NULL;
if ((extcount = X509_get_ext_count(cert)) > 0) {
for (i = 0; i < extcount; i++) {
ext = X509_get_ext(cert, i);
extstr = OBJ_nid2sn(OBJ_obj2nid(X509_EXTENSION_get_object(ext)));
if (strcasecmp(extstr, "proxyCertInfo"))
{
printf("ext string is : %s\n",extstr);
continue;
}
if (!(meth = X509V3_EXT_get(ext))) break;
data = ext->value->data;
// val = meth->i2v(meth, meth->d2i(0, &data, ext->value->length), 0);
#if (OPENSSL_VERSION_NUMBER > 0x00907000L)
if (meth->it)
ext_str = ASN1_item_d2i(NULL, &data, ext->value->length,
ASN1_ITEM_ptr(meth->it));
else
ext_str = meth->d2i(NULL, &data, ext->value->length);
#else
ext_str = meth->d2i(NULL, &data, ext->value->length);
#endif
val = meth->i2v(meth, ext_str, NULL);
for (j = 0; j < sk_CONF_VALUE_num(val); j++) {
nval = sk_CONF_VALUE_value(val, j);
if (!strcasecmp(nval->name, "URI"))
return strdup(nval->value);
}
}
}
return 0;
}
--------------------------------------------------------------------
The codes above is to get the value from extension section of
certificate. However, no matter how I try to run the code, it alway
threw out a segmentation fault. The segfault error occurred in the
line:
val = meth->i2v(meth, ext_str, NULL);
I have no idea what is wrong with it.
Could anybody give me some advice?
Thank in advance.
Best Regards,
Ian
On 7/13/07, Ian jonhson <[EMAIL PROTECTED]> wrote:
> No. Once the certificate has been signed it's done. If you want
> to change anything you have to resign (recreate) it.
>
OK, then how to fetch the custom information? Is it same as the sketch
but using X509_get_ext()?
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