Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5fa0fea27461f5ff7fad07687618db08272e9502
Commit: 5fa0fea27461f5ff7fad07687618db08272e9502
Parent: e962a653f3146330d99aefa5adadeaed60bc9bb5
Author: Herbert Xu <[EMAIL PROTECTED]>
AuthorDate: Wed Aug 29 16:31:34 2007 +0800
Committer: David S. Miller <[EMAIL PROTECTED]>
CommitDate: Wed Oct 10 16:55:42 2007 -0700
[CRYPTO] scatterwalk: Add scatterwalk_map_and_copy
This patch adds the function scatterwalk_map_and_copy which reads or
writes a chunk of data from a scatterlist at a given offset. It will
be used by authenc which would read/write the authentication data at
the end of the cipher/plain text.
Signed-off-by: Herbert Xu <[EMAIL PROTECTED]>
---
crypto/scatterwalk.c | 22 ++++++++++++++++++++++
crypto/scatterwalk.h | 3 +++
2 files changed, 25 insertions(+), 0 deletions(-)
diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c
index 81afd17..e93a8f6 100644
--- a/crypto/scatterwalk.c
+++ b/crypto/scatterwalk.c
@@ -107,3 +107,25 @@ void scatterwalk_copychunks(void *buf, struct scatter_walk
*walk,
}
}
EXPORT_SYMBOL_GPL(scatterwalk_copychunks);
+
+void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
+ unsigned int start, unsigned int nbytes, int out)
+{
+ struct scatter_walk walk;
+ unsigned int offset = 0;
+
+ for (;;) {
+ scatterwalk_start(&walk, sg);
+
+ if (start < offset + sg->length)
+ break;
+
+ offset += sg->length;
+ sg = sg_next(sg);
+ }
+
+ scatterwalk_advance(&walk, start - offset);
+ scatterwalk_copychunks(buf, &walk, nbytes, out);
+ scatterwalk_done(&walk, out, 0);
+}
+EXPORT_SYMBOL_GPL(scatterwalk_map_and_copy);
diff --git a/crypto/scatterwalk.h b/crypto/scatterwalk.h
index f1592cc..500a220 100644
--- a/crypto/scatterwalk.h
+++ b/crypto/scatterwalk.h
@@ -74,4 +74,7 @@ void scatterwalk_copychunks(void *buf, struct scatter_walk
*walk,
void *scatterwalk_map(struct scatter_walk *walk, int out);
void scatterwalk_done(struct scatter_walk *walk, int out, int more);
+void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
+ unsigned int start, unsigned int nbytes, int out);
+
#endif /* _CRYPTO_SCATTERWALK_H */
-
To unsubscribe from this list: send the line "unsubscribe git-commits-head" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
