The boundary check in the standard multi-block cipher processors are
broken when nbytes is not a multiple of bsize. In those cases it will
always process an extra block.
This patch corrects the check so that it processes at most nbytes of
data.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
The crypto layer currently uses in_atomic() to determine whether it is
allowed to sleep. This is incorrect since spin locks don't always cause
in_atomic() to return true.
Instead of that, this patch returns to an earlier idea of a per-tfm flag
which determines whether sleeping is allowed. Unlike the earlier version,
the default is to not allow sleeping. This ensures that no existing code
can break.
As usual, this flag may either be set through crypto_alloc_tfm(), or
just before a specific crypto operation.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Even though cit_iv is now always aligned, the user can still supply an
unaligned iv through crypto_cipher_encrypt_iv/crypto_cipher_decrypt_iv.
This patch will check the alignment of the user-supplied iv and copy
it if necessary.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch ensures that cit_iv is aligned according to cra_alignmask
by allocating it as part of the tfm structure. As a side effect the
crypto layer will also guarantee that the tfm ctx area has enough space
to be aligned by cra_alignmask. This allows us to remove the extra
space reservation from the Padlock driver.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
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 patch adds hooks for cipher algorithms to implement multi-block
ECB/CBC operations directly. This is expected to provide significant
performance boots to the VIA Padlock.
It could also be used for improving software implementations such as
AES where operating on multiple blocks at a time may enable certain
optimisations.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
The VIA Padlock device is able to perform much better when multiple
blocks are fed to it at once. As this device offers an exceptional
throughput rate it is worthwhile to optimise the infrastructure
specifically for it.
We shift the existing page-sized fast path down to the CBC/ECB functions.
We can then replace the CBC/ECB functions with functions provided by the
underlying algorithm that performs the multi-block operations.
As a side-effect this improves the performance of large cipher operations
for all existing algorithm implementations. I've measured the gain to be
around 5% for 3DES and 15% for AES.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Checking a pointer for NULL before calling kfree() on it is redundant.
This patch removes such checks from crypto/
Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Herbert Xu