[openssl-users] Extract content of DER-encoded package by OID
jmogannam at arkhamtechnology.com
Thu Jul 20 18:39:32 UTC 2017
Thanks for the tips thus far. One of the last issues I'm having is actually
declaring a CMS_ContentInfo structure. I just declare :
Amd gcc tells me "error: storage size of 'cms' isn't known". This goes back
to my question 1 of the previous email: is there a particular function call
to use to construct a CMS_ContentInfo structure? Thanks!
From: openssl-users [mailto:openssl-users-bounces at openssl.org] On Behalf Of
Dr. Stephen Henson
Sent: Wednesday, July 19, 2017 6:32 PM
To: openssl-users at openssl.org
Subject: Re: [openssl-users] Extract content of DER-encoded package by OID
On Wed, Jul 19, 2017, Justin Mogannam wrote:
> 2) Once again, I'm looking in openssl/cms.h, and I could not find the
> function prototype " d2i_CMS_ContentInfo". I even did a grep on the
> whole directory. Is it located somewhere else? I have OpenSSL 1.0.1,
> which is after 0.9.8 when the function was added to OpenSSL.
> 3) In looking at the function prototype (via
> CMS_ContentInfo *d2i_CMS_ContentInfo(CMS_ContentInfo **a, unsigned
> char **pp, long length); I'm assuming **pp is just a pointer to the
> array with the DER-encoded certificate in it? I just want to make sure
> since some of the parameter names are a little ambiguous in OpenSSL.
> I'm assuming once I'm able to get the DER-encoded certificate in a CMS
> object, I can use the function you provided and the ones in cms.h to
> strip off "layers" of the certificate to get the encryptedKeyPackage
> that I want (which, of course as you mentioned, I'll be able to handle
> the rest from there). Thank you very much for your response, as it was
> very helpful, and I hope to get just as useful of a response back!
I'm not sure what you mean by "certificate" here. The structure you
mentioned will be a CMS ContentInfo.
for details about how to decode the DER form.
Dr Stephen N. Henson. OpenSSL project core developer.
Commercial tech support now available see: http://www.openssl.org
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