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| author | Steffen Klassert <steffen.klassert@secunet.com> | 2010-11-22 11:25:50 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2010-12-02 14:47:15 +0800 |
| commit | 079f2f7485648c1397a35575fae45908a0db5ba6 (patch) | |
| tree | ca31a39f249f17feac5e26970c7b2fc881daacce | |
| parent | bc97e57eb21f8db55bf0e1f182d384e75b2e3c99 (diff) | |
crypto: scatterwalk - Add scatterwalk_crypto_chain helper
A lot of crypto algorithms implement their own chaining function.
So add a generic one that can be used from all the algorithms that
need scatterlist chaining.
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
| -rw-r--r-- | include/crypto/scatterwalk.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/crypto/scatterwalk.h b/include/crypto/scatterwalk.h index 833d208c25d..4fd95a323be 100644 --- a/include/crypto/scatterwalk.h +++ b/include/crypto/scatterwalk.h @@ -68,6 +68,21 @@ static inline struct scatterlist *scatterwalk_sg_next(struct scatterlist *sg) return (++sg)->length ? sg : (void *)sg_page(sg); } +static inline void scatterwalk_crypto_chain(struct scatterlist *head, + struct scatterlist *sg, + int chain, int num) +{ + if (chain) { + head->length += sg->length; + sg = scatterwalk_sg_next(sg); + } + + if (sg) + scatterwalk_sg_chain(head, num, sg); + else + sg_mark_end(head); +} + static inline unsigned long scatterwalk_samebuf(struct scatter_walk *walk_in, struct scatter_walk *walk_out) { |