GCM Tags

[jmcdaniels]

Modify EA for AES-GCM to confirm tag length guidelines in NIST SP 800-38D. Tag length of 128 bits unless Appendix C from NIST SP met. After initial modification, push to other PPs.

[jmcdaniels]

Added to App PP v2.0, if not problematic add issue to distribute in other PPs.