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authorSteffen Klassert <steffen.klassert@secunet.com>2010-11-22 11:25:50 +0100
committerHerbert Xu <herbert@gondor.apana.org.au>2010-12-02 14:47:15 +0800
commit079f2f7485648c1397a35575fae45908a0db5ba6 (patch)
treeca31a39f249f17feac5e26970c7b2fc881daacce /include/crypto
parentcrypto: algif_skcipher - Handle unaligned receive buffer (diff)
downloadlinux-dev-079f2f7485648c1397a35575fae45908a0db5ba6.tar.xz
linux-dev-079f2f7485648c1397a35575fae45908a0db5ba6.zip
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>
Diffstat (limited to 'include/crypto')
-rw-r--r--include/crypto/scatterwalk.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/crypto/scatterwalk.h b/include/crypto/scatterwalk.h
index 833d208c25d6..4fd95a323beb 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)
{