>
> Hello;
>
> I'm attempting to convert a buffer containing a sequence of
> DER-encoded objects into a set of X509 objects.
>
> The documentation for d2i_TYPE:
>
> TYPE *d2i_TYPE(a, pp, length)
> TYPE **a;
> unsigned char **pp;
> long length;
>
> says that "*pp will be updated to point to *pp + length, so that d2i can be
"length" here is not parameter value but the size of object just decoded
> called
> repeatedly with the same arguments to process a block of DER-encoded objects."
>
> However, I don't know what the length of each DER-encoded object is, so how
> can I pass in the proper value for "length" on each call to d2i_X509?
You need to pass the size of your buffer containing all der-encoded objects
in "length" parameter.
> Also, of
> what use is it to me for the routine to increment *pp, given that I would need
> to know "length" for each call anyway, and could therefore increment it
> myself?
One can keep *pp always pointing to original buffer right after the
last object decoded
> It seems to me that this routine should pass back the value of "length" for
> each DER-encoded object it finds in *pp. I must be misunderstanding
> something.
There's lots of user's (well, developer's) habits, shortcuts..etc
based on this concept already so it's unlikey to get changed easily.
What for do you need length of der-decoded objects?
hope this helps,
Vadim Fedukovich
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