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I have a signedData package that contains an encryptedKeyPackage (specifically OID 2.16.822.214.171.124.126.96.36.199, aka id-ct-KP-encryptedKeyPkg) that I want to extract from it. I am somewhat able to extract the sequence that contains this data via the OpenSSL command line:
$ openssl asn1parse -in <my_pkg.der> -inform DER -strparse <hard-coded offset I computed>
However, I am looking for the OpenSSL calls to do the same thing, ideally extract package contents by its OID without having to know the offset (such that I can extract the data from any given package by that particular OID). How would I go about doing this? I've been looking endlessly into asn1.h and x509.h, and am able to somewhat parse the entire package into a structure, but I could use some guidance as to how to further break it down into parts. Thank you, and I hope to hear a response back soon.
PS: I wasn't able to subscribe to the mailing list... I pressed "subscribe" and I got the following response from the mail server every time I tried:
The mail system
<email@example.com>: host mta.openssl.org[188.8.131.52] said: 550 5.1.1
<firstname.lastname@example.org>: Recipient address rejected: User unknown in
virtual alias table (in reply to RCPT TO command)
I'm guessing the subscribe email address is out of order for now? I hope people/the mods are still able to see my post. Thanks!