# File lib/fog/aws/signaturev4.rb, line 64 def derived_hmac(date) kDate = @hmac.sign(date.utc.strftime('%Y%m%d')) kRegion = Fog::HMAC.new('sha256', kDate).sign(@region) kService = Fog::HMAC.new('sha256', kRegion).sign(@service) kSigning = Fog::HMAC.new('sha256', kService).sign('aws4_request') Fog::HMAC.new('sha256', kSigning) end