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authorHerbert Xu <herbert@gondor.apana.org.au>2005-07-06 13:52:09 -0700
committerDavid S. Miller <davem@davemloft.net>2005-07-06 13:52:09 -0700
commit95477377995aefa2ec1654a9a3777bd57ea99146 (patch)
tree7aa4d6173de13c81c2fa0e4d2f9e0de22e141b6a /crypto/api.c
parent40725181b74be6b0e3bdc8c05bd1e0b9873ec5cc (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 'crypto/api.c')
-rw-r--r--crypto/api.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/crypto/api.c b/crypto/api.c
index 394169a8577d..f55856b21992 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -168,6 +168,12 @@ int crypto_register_alg(struct crypto_alg *alg)
{
int ret = 0;
struct crypto_alg *q;
+
+ if (alg->cra_alignmask & (alg->cra_alignmask + 1))
+ return -EINVAL;
+
+ if (alg->cra_alignmask > PAGE_SIZE)
+ return -EINVAL;
down_write(&crypto_alg_sem);

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