Herbert Xu dec8b78606 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>

2008-12-25 11:01:30 +11:00

7.3 KiB

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