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From: David Howells <dhowells@redhat.com>
To: Vitaly Chikunov <vt@altlinux.org>
Cc: dhowells@redhat.com, Stephan Mueller <smueller@chronox.de>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	Mimi Zohar <zohar@linux.vnet.ibm.com>,
	Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
	linux-integrity@vger.kernel.org, keyrings@vger.kernel.org,
	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 4/4] crypto: Add EC-RDSA algorithm
Date: Wed, 16 Jan 2019 16:15:20 +0000
Message-ID: <21602.1547655320@warthog.procyon.org.uk> (raw)
In-Reply-To: <1714084.mfT8VG1pOj@tauon.chronox.de>

Vitaly Chikunov <vt@altlinux.org> wrote:

> > Regarding your comment (2), I am not sure I understand. Why do you say that 
> > the DER format cannot be parsed by the kernel's ASN.1 parser? For example, 
> 
> It can, but DER is stricter than BER. For example, in DER 'OCTET STRING'
> length field should be encoded in just one byte if it's smaller than
> 128, in BER it could be encoded in multiple encodings. This does not
> seem like a big deal, though. With BER decoder an improperly DER-encoded
> certificate could be successfully parsed.

Whilst that is true, I don't think it's that big a deal.  DER is a subset of
BER, so a BER decoder ought to be able to parse it.  Note that X.509 is
supposed to be DER, but we use a BER decoder for that too.

David

  parent reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-06 13:36 [RFC PATCH 0/4] " Vitaly Chikunov
2019-01-06 13:36 ` [RFC PATCH 1/4] X.509: Parse public key parameters from x509 for akcipher Vitaly Chikunov
2019-02-09 21:42   ` Vitaly Chikunov
2019-02-10 18:46     ` Vitaly Chikunov
2019-02-19  4:37       ` Herbert Xu
2019-02-24  6:48         ` Vitaly Chikunov
2019-02-28  6:14           ` Herbert Xu
2019-02-28  7:04             ` Vitaly Chikunov
2019-02-28  7:11               ` Vitaly Chikunov
2019-02-28  7:51               ` Herbert Xu
2019-02-28  8:28                 ` Vitaly Chikunov
2019-02-28  9:01                   ` Herbert Xu
2019-02-28 10:33                     ` Vitaly Chikunov
2019-02-28 10:37                       ` Herbert Xu
2019-03-01 16:06                         ` Vitaly Chikunov
2019-01-06 13:36 ` [RFC PATCH 2/4] akcipher: Introduce verify2 for public key algorithms Vitaly Chikunov
2019-01-06 13:36 ` [RFC PATCH 3/4] KEYS: set correct flags for keyctl if encrypt is not supported Vitaly Chikunov
2019-01-06 13:36 ` [RFC PATCH 4/4] crypto: Add EC-RDSA algorithm Vitaly Chikunov
2019-01-06 18:11   ` Stephan Müller
2019-01-07  8:07     ` Vitaly Chikunov
2019-01-07  8:31       ` Stephan Mueller
2019-01-07  9:04         ` Vitaly Chikunov
2019-01-16 16:15         ` David Howells [this message]
2019-01-16 16:19 ` [RFC PATCH 2/4] akcipher: Introduce verify2 for public key algorithms David Howells

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