From: Mat Martineau <mathew.j.martineau@linux.intel.com>
To: Tadeusz Struk <tadeusz.struk@intel.com>
Cc: dhowells@redhat.com, herbert@gondor.apana.org.au,
smueller@chronox.de, linux-api@vger.kernel.org,
marcel@holtmann.org, linux-kernel@vger.kernel.org,
keyrings@vger.kernel.org, linux-crypto@vger.kernel.org,
dwmw2@infradead.org, davem@davemloft.net
Subject: Re: [PATCH v6 6/6] crypto: AF_ALG - add support for key_id
Date: Wed, 25 May 2016 17:45:48 -0700 (PDT) [thread overview]
Message-ID: <alpine.OSX.2.20.1605251640370.12130@mjmartin-mac01.local> (raw)
In-Reply-To: <20160515041719.15888.27170.stgit@tstruk-mobl1>
On Sat, 14 May 2016, Tadeusz Struk wrote:
> diff --git a/crypto/algif_akcipher.c b/crypto/algif_akcipher.c
> index e00793d..6733df1 100644
> --- a/crypto/algif_akcipher.c
> +++ b/crypto/algif_akcipher.c
> +static int asym_key_verify(const struct key *key, struct akcipher_request *req)
> +{
> + struct public_key_signature sig;
> + char *src = NULL, *in;
> + int ret;
> +
> + if (!sg_is_last(req->src)) {
> + src = kmalloc(req->src_len, GFP_KERNEL);
> + if (!src)
> + return -ENOMEM;
> + scatterwalk_map_and_copy(src, req->src, 0, req->src_len, 0);
> + in = src;
> + } else {
> + in = sg_virt(req->src);
> + }
> + sig.pkey_algo = "rsa";
> + sig.encoding = "pkcs1";
> + /* Need to find a way to pass the hash param */
Are you referring to sig.digest here? It looks like you will hit a
BUG_ON() in public_key_verify_signature() if sig.digest is 0. However,
sig.digest is unlikely to be 0 because the struct is not cleared - should
fix this, since public_key_verify_signature() will try to follow that
random pointer.
> + sig.hash_algo = "sha1";
> + sig.digest_size = 20;
> + sig.s_size = req->src_len;
> + sig.s = src;
> + ret = verify_signature(key, NULL, &sig);
Is the idea to write the signature to the socket, and then read out the
expected digest (the digest comparison being done elsewhere)? Is that
something that will be supported by a future hardware asymmetric key
subtype?
verify_signature() ends up calling public_key_verify_signature(), which
currently expects to get both the digest and signature as input and
returns an error if verification fails. The output of
crypto_akcipher_verify() is discarded before public_key_verify_signature()
returns so nothing ends up in req->dst to read from the socket.
ALG_OP_VERIFY should behave the same whether using ALG_SET_PUBKEY or
ALG_SET_PUBKEY_ID, and they aren't right now.
If sig.digest is 0, verify_signature() could return the expected digest in
the sig structure and skip the digest comparison it currently does. Then
that data could be packaged up in req as if crypto_akcipher_verify() had
been called. I don't know if this change confuses the semantics of
verify_signature() too much, maybe a new function is required with all the
requisite plumbing to the asymmetric key subtype.
--
Mat Martineau
Intel OTC
next prev parent reply other threads:[~2016-05-26 0:46 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-05 19:50 [PATCH RESEND v5 0/6] crypto: algif - add akcipher Tadeusz Struk
2016-05-05 19:50 ` [PATCH RESEND v5 1/6] crypto: AF_ALG -- add sign/verify API Tadeusz Struk
2016-05-06 10:36 ` Stephan Mueller
2016-05-05 19:50 ` [PATCH RESEND v5 2/6] crypto: AF_ALG -- add setpubkey setsockopt call Tadeusz Struk
2016-05-05 19:51 ` [PATCH RESEND v5 3/6] crypto: AF_ALG -- add asymmetric cipher interface Tadeusz Struk
2016-05-05 19:51 ` [PATCH RESEND v5 4/6] crypto: algif_akcipher - enable compilation Tadeusz Struk
2016-05-05 19:51 ` [PATCH RESEND v5 5/6] crypto: algif_akcipher - add ops_nokey Tadeusz Struk
2016-05-05 19:51 ` [PATCH RESEND v5 6/6] crypto: AF_ALG - add support for key_id Tadeusz Struk
2016-05-06 11:46 ` Stephan Mueller
2016-05-13 23:32 ` Mat Martineau
2016-05-16 14:23 ` Tadeusz Struk
2016-05-11 14:25 ` [PATCH RESEND v5 0/6] crypto: algif - add akcipher David Howells
2016-05-15 4:16 ` [PATCH v6 " Tadeusz Struk
2016-05-15 4:16 ` [PATCH v6 1/6] crypto: AF_ALG -- add sign/verify API Tadeusz Struk
2016-05-15 4:16 ` [PATCH v6 2/6] crypto: AF_ALG -- add setpubkey setsockopt call Tadeusz Struk
2016-05-15 4:17 ` [PATCH v6 3/6] crypto: AF_ALG -- add asymmetric cipher interface Tadeusz Struk
2016-06-08 0:28 ` Mat Martineau
2016-06-08 5:31 ` Stephan Mueller
2016-06-08 19:14 ` Mat Martineau
2016-06-09 9:28 ` Stephan Mueller
2016-06-09 18:18 ` Mat Martineau
2016-06-09 18:24 ` Stephan Mueller
2016-06-09 18:27 ` Mat Martineau
2016-06-09 18:36 ` Stephan Mueller
2016-06-10 14:42 ` Tadeusz Struk
2016-06-22 22:45 ` Mat Martineau
2016-06-23 5:07 ` Stephan Mueller
2016-06-23 15:22 ` Denis Kenzior
2016-06-13 22:16 ` Andrew Zaborowski
2016-06-14 5:12 ` Stephan Mueller
2016-06-14 7:42 ` Andrew Zaborowski
2016-06-16 8:05 ` Stephan Mueller
2016-06-16 14:59 ` Andrew Zaborowski
2016-06-16 15:38 ` Stephan Mueller
2016-06-17 0:39 ` Andrew Zaborowski
2016-06-14 17:22 ` Mat Martineau
2016-06-15 7:04 ` Stephan Mueller
2016-05-15 4:17 ` [PATCH v6 4/6] crypto: algif_akcipher - enable compilation Tadeusz Struk
2016-05-15 4:17 ` [PATCH v6 5/6] crypto: algif_akcipher - add ops_nokey Tadeusz Struk
2016-05-15 4:17 ` [PATCH v6 6/6] crypto: AF_ALG - add support for key_id Tadeusz Struk
2016-05-26 0:45 ` Mat Martineau [this message]
2016-05-31 17:44 ` Tadeusz Struk
2016-05-15 11:59 ` [PATCH v6 0/6] crypto: algif - add akcipher Stephan Mueller
2016-05-16 20:46 ` Tadeusz Struk
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=alpine.OSX.2.20.1605251640370.12130@mjmartin-mac01.local \
--to=mathew.j.martineau@linux.intel.com \
--cc=davem@davemloft.net \
--cc=dhowells@redhat.com \
--cc=dwmw2@infradead.org \
--cc=herbert@gondor.apana.org.au \
--cc=keyrings@vger.kernel.org \
--cc=linux-api@vger.kernel.org \
--cc=linux-crypto@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=marcel@holtmann.org \
--cc=smueller@chronox.de \
--cc=tadeusz.struk@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).