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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2007-09-29 21:24:23 +0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-10-10 16:55:46 -0700 |
| commit | 70613783fc0f6e37b442d79e8417f71a2b71ed93 (patch) | |
| tree | 94cf5beb318c16e608fb7e03d4eed7decaaeefc1 /crypto/blkcipher.c | |
| parent | e4c5c6c9b0d04a7dac19027260f7421305a34856 (diff) | |
| download | lwn-70613783fc0f6e37b442d79e8417f71a2b71ed93.tar.gz lwn-70613783fc0f6e37b442d79e8417f71a2b71ed93.zip | |
[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>
Diffstat (limited to 'crypto/blkcipher.c')
| -rw-r--r-- | crypto/blkcipher.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c index 9c49770837c2..a3c87da23f1e 100644 --- a/crypto/blkcipher.c +++ b/crypto/blkcipher.c @@ -149,6 +149,7 @@ static inline int blkcipher_next_slow(struct blkcipher_desc *desc, unsigned int alignmask) { unsigned int n; + unsigned aligned_bsize = ALIGN(bsize, alignmask + 1); if (walk->buffer) goto ok; @@ -167,8 +168,8 @@ ok: 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 @@ static inline int blkcipher_copy_iv(struct blkcipher_walk *walk, { 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 @@ static inline int blkcipher_copy_iv(struct blkcipher_walk *walk, 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); |