[openssl-users] Example code to add several CRL distribution points

Dave Coombs dcoombs at carillon.ca
Thu Nov 23 17:04:34 UTC 2017

Hi Dirk,

First point: you are populating distpoint->name.relativename (which is a union member) but setting the discriminator distpoint->type to 0, which indicates to use fullname rather than relativename.  So your structure will not be interpreted correctly.

In any case, I think you want to populate fullname, instead of relativename.  You're using a url, not a relative DN.

Make a GENERAL_NAMES, and add to it a GENERAL_NAME whose type is GEN_URI, and whose value (as an IA5String) is the url you want, and then point distpoint->name.fullname at the GENERAL_NAMES.

And, as before, you can do this multiple times and add additional DIST_POINTs.

Good luck,

> On Nov 23, 2017, at 03:54, Dirk Menstermann <noadsplease at web.de> wrote:
> Thanks Dave,
> It seems that I do something wrong when filling the STACK_OF(DIST_POINT):
> X509_NAME_ENTRY *nameEntry = X509_NAME_ENTRY_new();
> X509_NAME_ENTRY_set_data (nameEntry, V_ASN1_IA5STRING /*MBSTRING_ASC*/, (const
> unsigned char*) "http://example.com/", 19);
> STACK_OF (X509_NAME_ENTRY) *nameStack = sk_X509_NAME_ENTRY_new_null();
> sk_X509_NAME_ENTRY_push (nameStack, nameEntry);
> DIST_POINT *distPoint = DIST_POINT_new();
> distPoint->distpoint = DIST_POINT_NAME_new();
> distPoint->distpoint->name.relativename = nameStack;
> distPoint->distpoint->type = 0;
> STACK_OF(DIST_POINT) *distPoints = sk_DIST_POINT_new_null();
> sk_DIST_POINT_push (distPoints, distPoint);
> X509_EXTENSION *ext = X509V3_EXT_i2d (NID_crl_distribution_points, 0, distPoints);
> X509_add_ext (cert, ext, -1);
> X509_EXTENSION_free (ext);
> The extension will be added, but is empty.
> Do you see where it breaks?
> Dirk
> On 22.11.2017 15:04, Dave Coombs wrote:
>> You can use X509V3_EXT_i2d(NID_crl_distribution_points, critical, sk) where sk is a STACK_OF(DIST_POINT) that you have previously filled with multiple URIs.
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