[CRYPTO] blkcipher: Remove alignment restriction on block size
Previously we assumed for convenience that the block size is a multiple of
the algorithm's required alignment. With the pending addition of CTR this
will no longer be the case as the block size will be 1 due to it being a
stream cipher. However, the alignment requirement will be that of the
underlying implementation which will most likely be greater than 1.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c
index 9c49770..a3c87da 100644
--- a/crypto/blkcipher.c
+++ b/crypto/blkcipher.c
@@ -149,6 +149,7 @@
unsigned int alignmask)
{
unsigned int n;
+ unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
if (walk->buffer)
goto ok;
@@ -167,8 +168,8 @@
walk->dst.virt.addr = (u8 *)ALIGN((unsigned long)walk->buffer,
alignmask + 1);
walk->dst.virt.addr = blkcipher_get_spot(walk->dst.virt.addr, bsize);
- walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr + bsize,
- bsize);
+ walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr +
+ aligned_bsize, bsize);
scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0);
@@ -278,7 +279,9 @@
{
unsigned bs = crypto_blkcipher_blocksize(tfm);
unsigned int ivsize = crypto_blkcipher_ivsize(tfm);
- unsigned int size = bs * 2 + ivsize + max(bs, ivsize) - (alignmask + 1);
+ unsigned aligned_bs = ALIGN(bs, alignmask + 1);
+ unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
+ (alignmask + 1);
u8 *iv;
size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
@@ -287,8 +290,8 @@
return -ENOMEM;
iv = (u8 *)ALIGN((unsigned long)walk->buffer, alignmask + 1);
- iv = blkcipher_get_spot(iv, bs) + bs;
- iv = blkcipher_get_spot(iv, bs) + bs;
+ iv = blkcipher_get_spot(iv, bs) + aligned_bs;
+ iv = blkcipher_get_spot(iv, bs) + aligned_bs;
iv = blkcipher_get_spot(iv, ivsize);
walk->iv = memcpy(iv, walk->iv, ivsize);