From: Milan Broz <gmazyland@gmail.com>
To: Pascal Van Leeuwen <pvanleeuwen@verimatrix.com>,
Pascal van Leeuwen <pascalvanl@gmail.com>,
"linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>
Cc: "rsnel@cube.dyndns.org" <rsnel@cube.dyndns.org>,
"herbert@gondor.apana.org.au" <herbert@gondor.apana.org.au>,
"davem@davemloft.net" <davem@davemloft.net>
Subject: Re: [PATCH] crypto: xts - Add support for Cipher Text Stealing
Date: Wed, 7 Aug 2019 19:24:29 +0200 [thread overview]
Message-ID: <46f76b06-004e-c08a-3ef3-4ba9fdc61d91@gmail.com> (raw)
In-Reply-To: <MN2PR20MB2973C4EAF89D158B779CDBDACAD40@MN2PR20MB2973.namprd20.prod.outlook.com>
On 07/08/2019 17:13, Pascal Van Leeuwen wrote:
>>>> Seems there is no mistake in your code, it is some bug in aesni_intel implementation.
>>>> If I disable this module, it works as expected (with aes generic and aes_i586).
>>>>
>>> That's odd though, considering there is a dedicated xts-aes-ni implementation,
>>> i.e. I would not expect that to end up at the generic xts wrapper at all?
>>
>> Note it is 32bit system, AESNI XTS is under #ifdef CONFIG_X86_64 so it is not used.
>>
> Ok, so I guess no one bothered to make an optimized XTS version for i386.
> I quickly browsed through the code - took me a while to realise the assembly is
> "backwards" compared to the original Intel definition :-) - but I did not spot
> anything obvious :-(
>
>> I guess it only ECB part ...
Mystery solved, the skcipher subreq must be te last member in the struct.
(Some comments in Adiantum code mentions it too, so I do not think it
just hides the corruption after the struct. Seems like another magic requirement
in crypto API :-)
This chunk is enough to fix it for me:
--- a/crypto/xts.c
+++ b/crypto/xts.c
@@ -33,8 +33,8 @@ struct xts_instance_ctx {
struct rctx {
le128 t, tcur;
- struct skcipher_request subreq;
int rem_bytes, is_encrypt;
+ struct skcipher_request subreq;
};
While at it, shouldn't be is_encrypt bool?
Thanks,
Milan
next prev parent reply other threads:[~2019-08-07 17:24 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-06 6:55 [PATCH] crypto: xts - Add support for Cipher Text Stealing Pascal van Leeuwen
2019-08-06 18:34 ` Milan Broz
2019-08-06 19:36 ` Pascal Van Leeuwen
2019-08-07 8:15 ` Pascal Van Leeuwen
2019-08-07 11:19 ` Milan Broz
2019-08-07 11:27 ` Pascal Van Leeuwen
2019-08-07 11:41 ` Milan Broz
2019-08-07 15:13 ` Pascal Van Leeuwen
2019-08-07 17:24 ` Milan Broz [this message]
2019-08-07 20:26 ` Pascal Van Leeuwen
2019-08-07 20:32 ` Ondrej Mosnáček
2019-08-07 21:13 ` Pascal Van Leeuwen
2019-08-08 4:35 ` Milan Broz
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