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author | Herbert Xu <herbert@gondor.apana.org.au> | 2007-11-20 17:36:00 +0800 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2008-01-11 08:16:19 +1100 |
commit | 50b6544e1371bfe884f787107a8de0c2f8546e8f (patch) | |
tree | c4147931acf41f6e24b19ee0c4dafb8a84ef6a8b /crypto/fcrypt.c | |
parent | 3c7f076da557eadb37240d70b0399ff9763fa2ae (diff) | |
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[CRYPTO] cbc: Require block size to be a power of 2
All common block ciphers have a block size that's a power of 2. In fact,
all of our block ciphers obey this rule.
If we require this then CBC can be optimised to avoid an expensive divide
on in-place decryption.
I've also changed the saving of the first IV in the in-place decryption
case to the last IV because that lets us use walk->iv (which is already
aligned) for the xor operation where alignment is required.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/fcrypt.c')
0 files changed, 0 insertions, 0 deletions