Feature: Add new HMACSigner which generated signed, timestamped msgs given a key and an algo
Feature: Add new HMACSigner which generated signed, timestamped msgs given a key and an algo

nlevitt/webarchive-commons,gerhardgossen/webarchive-commons,iipc/webarchive-commons,iipc/webarchive-commons,rjoberon/webarchive-commons,ukwa/webarchive-commons,ukwa/webarchive-commons,internetarchive/webarchive-commons,internetarchive/webarchive-commons,rjoberon/webarchive-commons,gerhardgossen/webarchive-commons