Add support for OID 1.3.14.3.2.7

Hi,
I'm currently trying to build a SCEP server in NodeJS; to decrypt the EnvelopedData of the PKCS#7 request message I modified these files.  

http://www.cisco.com/en/US/tech/tk1132/technologies_tech_note09186a0080c15dab.shtml#anc6

Thank you!