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crypto: hash - Add import/export interface

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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>
This commit is contained in:
Herbert Xu 2008-11-02 21:38:11 +08:00
parent 3b2f6df082
commit dec8b78606
5 changed files with 50 additions and 5 deletions
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include/linux/crypto.h
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@ -221,6 +221,7 @@ struct ablkcipher_alg {
struct ahash_alg {
int (*init)(struct ahash_request *req);
int (*reinit)(struct ahash_request *req);
int (*update)(struct ahash_request *req);
int (*final)(struct ahash_request *req);
int (*digest)(struct ahash_request *req);