diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2005-07-06 13:52:09 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2005-07-06 13:52:09 -0700 |
| commit | 95477377995aefa2ec1654a9a3777bd57ea99146 (patch) | |
| tree | 7aa4d6173de13c81c2fa0e4d2f9e0de22e141b6a /include | |
| parent | 40725181b74be6b0e3bdc8c05bd1e0b9873ec5cc (diff) | |
[CRYPTO] Add alignmask for low-level cipher implementations
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/crypto.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/crypto.h b/include/linux/crypto.h index 26ce01c2574..ac9d49beecd 100644 --- a/include/linux/crypto.h +++ b/include/linux/crypto.h @@ -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 { |