From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Sun, 2 Nov 2008 13:38:11 +0000 (+0800)
Subject: crypto: hash - Add import/export interface
X-Git-Tag: v2.6.29-rc1~589^2~42
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dec8b78606ebd5f309c38f2fb10196ce996dd18d;p=pandora-kernel.git

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>
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