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From: Mimi Zohar <zohar@linux.ibm.com>
To: Vitaly Chikunov <vt@altlinux.org>,
	Thiago Jung Bauermann <bauerman@linux.ibm.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>,
	David Howells <dhowells@redhat.com>,
	linux-integrity@vger.kernel.org, keyrings@vger.kernel.org,
	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
	Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
Subject: Re: [PATCH v5 10/10] integrity: support EC-RDSA signatures for asymmetric_verify
Date: Tue, 26 Feb 2019 07:07:43 -0500	[thread overview]
Message-ID: <1551182863.27819.62.camel@linux.ibm.com> (raw)
In-Reply-To: <20190226042546.czh6me47f7xldgk2@altlinux.org>


> > > diff --git a/security/integrity/digsig_asymmetric.c b/security/integrity/digsig_asymmetric.c
> > > index d775e03fbbcc..c4a3313e0210 100644
> > > --- a/security/integrity/digsig_asymmetric.c
> > > +++ b/security/integrity/digsig_asymmetric.c
> > > @@ -104,9 +104,14 @@ int asymmetric_verify(struct key *keyring, const char *sig,
> > >
> > >  	memset(&pks, 0, sizeof(pks));
> > >
> > > -	pks.pkey_algo = "rsa";
> > >  	pks.hash_algo = hash_algo_name[hdr->hash_algo];
> > > -	pks.encoding = "pkcs1";
> > > +	if (!strncmp(pks.hash_algo, "streebog", 8)) {
> > 
> > Is it possible to test hdr->hash_algo instead of pkcs.hash_algo? IMHO if
> > an integer value is available it's preferable to check it rather than
> > doing a string comparison.
> 
> Yes. But we have long tradition of comparing by the name too:
> 
>   --linux$ git grep str.*cmp.*'"sha[12]'
>   drivers/crypto/mxs-dcp.c:       if (strcmp(halg->base.cra_name, "sha1") == 0)
>   drivers/crypto/talitos.c:                   (!strcmp(alg->cra_name, "sha224") ||
>   net/sctp/sysctl.c:              if (!strncmp(tmp, "sha1", 4)) {
>   scripts/sign-file.c:    if (strcmp(hash_algo, "sha1") != 0) {

sign_file.c is a userspace program used for signing kernel modules.
 This example is not applicable.

>   security/integrity/ima/ima_main.c:              if (strncmp(str, "sha1", 4) == 0)

In the ima_main.c example, it is used in an __init function to set up
crypto defaults.  The code also predates the enumerations defined in
crypto/hash_info.c.

Mimi


  reply	other threads:[~2019-02-26 12:08 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-24  6:08 [PATCH v5 00/10] crypto: add EC-RDSA (GOST 34.10) algorithm Vitaly Chikunov
2019-02-24  6:08 ` [PATCH v5 01/10] KEYS: report to keyctl only actually supported key ops Vitaly Chikunov
2019-02-24  6:08 ` [PATCH v5 02/10] crypto: akcipher - check the presence of callback before the call Vitaly Chikunov
2019-02-24  6:08 ` [PATCH v5 03/10] crypto: rsa - unimplement sign/verify for raw RSA backends Vitaly Chikunov
2019-02-24  6:08 ` [PATCH v5 04/10] crypto: akcipher - new verify API for public key algorithms Vitaly Chikunov
2019-02-27 23:28   ` Mimi Zohar
2019-02-28  5:37     ` Vitaly Chikunov
2019-02-24  6:08 ` [PATCH v5 05/10] X.509: parse public key parameters from x509 for akcipher Vitaly Chikunov
2019-02-24  6:08 ` [PATCH v5 06/10] crypto: Kconfig - create Public-key cryptography section Vitaly Chikunov
2019-02-24  6:08 ` [PATCH v5 07/10] crypto: ecc - make ecc into separate module Vitaly Chikunov
2019-02-24  6:08 ` [PATCH v5 08/10] crypto: ecrdsa - add EC-RDSA (GOST 34.10) algorithm Vitaly Chikunov
2019-02-24  6:08 ` [PATCH v5 09/10] crypto: ecrdsa - add EC-RDSA test vectors to testmgr Vitaly Chikunov
2019-02-24  6:08 ` [PATCH v5 10/10] integrity: support EC-RDSA signatures for asymmetric_verify Vitaly Chikunov
2019-02-25 21:20   ` Thiago Jung Bauermann
2019-02-26  4:25     ` Vitaly Chikunov
2019-02-26 12:07       ` Mimi Zohar [this message]
2019-02-28 18:18 ` [PATCH v5 04/10] crypto: akcipher - new verify API for public key algorithms David Howells
2019-02-28 18:39   ` Vitaly Chikunov
2019-02-28 19:02   ` David Howells
2019-02-28 19:07     ` Vitaly Chikunov
2019-03-01  2:34       ` Herbert Xu

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