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[CRYPTO] Add alignmask for low-level cipher implementations

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The VIA Padlock device requires the input and output buffers to
be aligned on 16-byte boundaries.  This patch adds the alignmask
attribute for low-level cipher implementations to indicate their
alignment requirements.

The mid-level crypt() function will copy the input/output buffers
if they are not aligned correctly before they are passed to the
low-level implementation.

Strictly speaking, some of the software implementations require
the buffers to be aligned on 4-byte boundaries as they do 32-bit
loads.  However, it is not clear whether it is better to copy
the buffers or pay the penalty for unaligned loads/stores.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2005-07-06 13:52:09 -07:00 • committed by David S. Miller
parent 40725181b7
commit 9547737799
4 changed files with 49 additions and 7 deletions
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1
include/linux/crypto.h
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@ -124,6 +124,7 @@ struct crypto_alg {
u32 cra_flags;
unsigned int cra_blocksize;
unsigned int cra_ctxsize;
unsigned int cra_alignmask;
const char cra_name[CRYPTO_MAX_ALG_NAME];
union {