Source for PKCS#11 Header Files Is there a known authoritative source for the ANSI C header files for PKCS#11 Cryptoki? Specifically, I am having trouble locating pkcs11.h, pkcs11t.h, and pkcs11f.h for v2.30 and v2.40. Are there known MD5 or SHA hashes for these files?
The PKCS#11 standard has transitioned from RSA to the OASIS group:
https://www.oasis-open.org/committees/tc_home.php?wg_abbrev=pkcs11

I am not sure why RSA/EMC's site doesn't mention this.

I believe that v2.30 was close to finalization, but was never formally released.  I am not sure what happened but v2.40 is now the current release candidate.  

v2.20 is the current revision and header files are accessible by following the link that Mr. Stone provided.

CryptSoft (Tim Hudson is a PKCS#11 leader) has a very good resource page:
http://www.cryptsoft.com/pkcs11doc/