Re: [PATCH] crypto: fix key alignment in tcrypt

[Andreas Schwab]

Matt Mackall <mpm@xxxxxxxxxxx> writes:

> On Wed, Mar 08, 2006 at 11:11:55PM +0900, Atsushi Nemoto wrote:
>> Force 32-bit alignment on keys in tcrypt test vectors.
>> 
>> Signed-off-by: Atsushi Nemoto <anemo@xxxxxxxxxxxxx>
>> 
>> diff --git a/crypto/tcrypt.h b/crypto/tcrypt.h
>> index 733d07e..050f852 100644
>> --- a/crypto/tcrypt.h
>> +++ b/crypto/tcrypt.h
>> @@ -31,7 +31,7 @@ struct hash_testvec {
>>  	char digest[MAX_DIGEST_SIZE];
>>  	unsigned char np;
>>  	unsigned char tap[MAX_TAP];
>> -	char key[128]; /* only used with keyed hash algorithms */
>> +	char key[128] __attribute__((__aligned__(4))); /* only used with keyed hash algorithms */
>>  	unsigned char ksize;
>>  };
>>  
>> @@ -48,7 +48,7 @@ struct hmac_testvec {
>>  struct cipher_testvec {
>>  	unsigned char fail;
>>  	unsigned char wk; /* weak key flag */
>> -	char key[MAX_KEYLEN];
>> +	char key[MAX_KEYLEN] __attribute__((__aligned__(4)));
>>  	unsigned char klen;
>>  	char iv[MAX_IVLEN];
>>  	char input[48];
>
> Wouldn't it be better to simply move this to the head of the structure?

That wouldn't help, since the whole structure will still be only 8-bit
aligned.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@xxxxxxx
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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"And now for something completely different."
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