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Commit 079f2f74 authored by Steffen Klassert's avatar Steffen Klassert Committed by Herbert Xu
Browse files

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: default avatarSteffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent bc97e57e

include/crypto/scatterwalk.h

+15 −0
Original line number Diff line number Diff line
@@ -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)

{