tree 005ef526f1b0e953a3a57e6c991e0921fcd5234b
parent 3b2f6df08258e2875f42bd630eece7e7241a053b
author Herbert Xu <herbert@gondor.apana.org.au> 1225633091 +0800
committer Herbert Xu <herbert@gondor.apana.org.au> 1230163290 +1100

crypto: hash - Add import/export interface

It is often useful to save the partial state of a hash function
so that it can be used as a base for two or more computations.

The most prominent example is HMAC where all hashes start from
a base determined by the key.  Having an import/export interface
means that we only have to compute that base once rather than
for each message.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>