From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 135E1C43603 for ; Mon, 9 Dec 2019 22:05:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CCA2F206D5 for ; Mon, 9 Dec 2019 22:05:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="PGwobsNF" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726495AbfLIWFu (ORCPT ); Mon, 9 Dec 2019 17:05:50 -0500 Received: from mail-il1-f194.google.com ([209.85.166.194]:41996 "EHLO mail-il1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726230AbfLIWFu (ORCPT ); Mon, 9 Dec 2019 17:05:50 -0500 Received: by mail-il1-f194.google.com with SMTP id f6so14199118ilh.9 for ; Mon, 09 Dec 2019 14:05:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=4d99rdcJEhnL7/cP2RgimdrOj1crcG/Foc9CU8wtD1k=; b=PGwobsNFczZWRZkynfWmhal2g/jndE4tCw6mJdgmLcQKNzP4Vj1y736OI9YQ5DWQCW N2xYe6pqgd3Cs8O0kWBxFZtecrav2+PA0qPazha50hrz9GShIDhla070dfpkd4ZKt6HA D7adeonhzaVpt3zt173dB5hlFZszdV7PC8TvmEOpovra7jWmRHhK74uqHW3wLIlFYtXa ZMPxJbWo8ncaN3YQY2UDX9MoD5oVhL0zmrw9FDePAMyGgvOC9XUkcFTvwsHgn5dgooRh SzvYoWqvjw2TG9nfWTTtR7sEzydaEBGoN2IMHQx22B9gd3mM9FtlzUmj2OQqbdRk92gi VbEw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=4d99rdcJEhnL7/cP2RgimdrOj1crcG/Foc9CU8wtD1k=; b=nEc1TGOmSR2GWL/zA9l53c8Vk2aDcj8x3OspCXg6Ck7skaMilGJjrA63/WJq9s2bny gjGvTxQAKUvE2ecnZiD6F8Q3huZ9ZqL1h+rf1RS2vsL59SiIVeR1qmf68wTl//xcN52w ycRZDuNCAf9UIX/dBcfF9MfPXdxxZ7I0Sa3o6o6mCLCPxX3rvj1dnHLrucunMn1HLN6B pcdq+s9cNflnW36M5LJ1VIDKDyi536zD9wFeUH44L8bF3GMdMUUGNHmWvtZ+DGIh/bDd z2OliwWu8ktTrcktZtJcHVxfRmzZc+6g/s6951hUEnokm2Bva74h3Dg+fukmEO5aitsF PTBw== X-Gm-Message-State: APjAAAVfErWmPFACDI9X1h3tXuVeWJx+YdigLVrWKmo2xiNWmhnub5Xb Af5RrnJzuQRcPgTd7DYgSJeLvQdgpRqKt8VUzWTIhg== X-Google-Smtp-Source: APXvYqzynpgzuJtjmR+PATuERJavTs4fetrBQ6lBBZPrhtQ4InueqxV+aBBpY3WxYO48Deo0d9hscE5iMooDcdsA1Y0= X-Received: by 2002:a92:d609:: with SMTP id w9mr32023842ilm.46.1575929149269; Mon, 09 Dec 2019 14:05:49 -0800 (PST) MIME-Version: 1.0 References: <1575781600.14069.8.camel@HansenPartnership.com> <1575781706.14069.10.camel@HansenPartnership.com> In-Reply-To: <1575781706.14069.10.camel@HansenPartnership.com> From: Matthew Garrett Date: Mon, 9 Dec 2019 14:05:38 -0800 Message-ID: Subject: Re: [PATCH 2/8] lib: add asn.1 encoder To: James Bottomley Cc: linux-integrity , Mimi Zohar , Jarkko Sakkinen Content-Type: text/plain; charset="UTF-8" Sender: linux-integrity-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org On Sat, Dec 7, 2019 at 9:08 PM James Bottomley wrote: > > We have a need in the TPM trusted keys to return the ASN.1 form of the > TPM key blob so it can be operated on by tools outside of the kernel. > To do that, we have to be able to read and write the key format. The > current ASN.1 decoder does fine for reading, but we need pieces of an > ASN.1 encoder to return the key blob. Is there a reason the kernel needs to do this encoding, rather than having something in userland do the translation?