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authorHerbert Xu <herbert@gondor.apana.org.au>2007-11-20 17:36:00 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2008-01-11 08:16:19 +1100
commit50b6544e1371bfe884f787107a8de0c2f8546e8f (patch)
treec4147931acf41f6e24b19ee0c4dafb8a84ef6a8b /crypto/pcbc.c
parent3c7f076da557eadb37240d70b0399ff9763fa2ae (diff)
[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/pcbc.c')
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