# File lib/fog/aws/signaturev4.rb, line 15
      def signature_parameters(params, date, body_sha = nil)
        params = params.dup.merge(:query => params[:query].merge(
          'X-Amz-Algorithm' => ALGORITHM,
          'X-Amz-Credential' => "#{@aws_access_key_id}/#{credential_scope(date)}",
          'X-Amz-SignedHeaders' => signed_headers(params[:headers])
        ))
        signature_components(params, date, body_sha)
      end