Subject: Re: [PATCH 03/18] asymmetric keys: separate the length checking of
 octet string from RSA_I2OSP
From: joeyli <jlee@suse.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org,
        linux-efi@vger.kernel.org, linux-pm@vger.kernel.org,
        linux-crypto@vger.kernel.org, opensuse-kernel@opensuse.org,
        David Howells <dhowells@redhat.com>, "Rafael J. Wysocki" <rjw@sisk.pl>,
        Matthew Garrett <mjg59@srcf.ucam.org>, Len Brown <len.brown@intel.com>,
        Josh Boyer <jwboyer@redhat.com>, Vojtech Pavlik <vojtech@suse.cz>,
        Matt Fleming <matt.fleming@intel.com>,
        James Bottomley <james.bottomley@hansenpartnership.com>,
        Greg KH <gregkh@linuxfoundation.org>, JKosina@suse.com,
        Rusty Russell <rusty@rustcorp.com.au>,
        Herbert Xu <herbert@gondor.hengli.com.au>,
        "David S. Miller" <davem@davemloft.net>,
        "H. Peter Anvin" <hpa@zytor.com>, Michal Marek <mmarek@suse.cz>,
        Gary Lin <GLin@suse.com>, Vivek Goyal <vgoyal@redhat.com>
In-Reply-To: <20130825160147.GB5171@amd.pavel.ucw.cz>
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Date: Mon, 26 Aug 2013 18:25:31 +0800
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於 日，2013-08-25 於 18:01 +0200，Pavel Machek 提到：
> On Thu 2013-08-22 19:01:42, Lee, Chun-Yi wrote:
> > Due to RSA_I2OSP is not only used by signature verification path but also used
> > in signature generation path. So, separate the length checking of octet string
> > because it's not for generate 0x00 0x01 leading string when used in signature
> > generation.
> > 
> > Reviewed-by: Jiri Kosina <jkosina@suse.cz>
> > Signed-off-by: Lee, Chun-Yi <jlee@suse.com>
> 
> > +static int RSA_I2OSP(MPI x, size_t xLen, u8 **_X)
> > +{
> > +	unsigned x_size;
> > +	unsigned X_size;
> > +	u8 *X = NULL;
> 
> Is this kernel code or entry into obfuscated C code contest? This is not funny.
> 
> 									Pavel

The small "x" is the input integer that will transfer to big "X" that is
a octet sting. 

Sorry for I direct give variable name to match with spec, maybe I need
use big_X or....

Do you have good suggest for the naming?


Thanks a lot!
Joey Lee


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