> -----Original Message----- > From: linux-crypto-owner@xxxxxxxxxxxxxxx [mailto:linux-crypto- > owner@xxxxxxxxxxxxxxx] On Behalf Of Tudor Ambarus > Sent: Wednesday, March 23, 2016 5:06 PM > To: herbert@xxxxxxxxxxxxxxxxxxx > Cc: tadeusz.struk@xxxxxxxxx; linux-crypto@xxxxxxxxxxxxxxx; > smueller@xxxxxxxxxx; Horia Ioan Geanta Neag <horia.geanta@xxxxxxx>; > Tudor-Dan Ambarus <tudor-dan.ambarus@xxxxxxx> > Subject: [PATCH v2 1/3] crypto: scatterwak - Add scatterwalk_sg_copychunks > > This patch adds the function scatterwalk_sg_copychunks which writes a > chunk of data from a scatterwalk to another scatterwalk. > It will be used by caam driver to remove the leading zeros of RSA's algorithm > output. > > Signed-off-by: Tudor Ambarus <tudor-dan.ambarus@xxxxxxx> Acked-by: Cristian Stoica <cristian.stoica@xxxxxxx> > --- > crypto/scatterwalk.c | 26 ++++++++++++++++++++++++++ > include/crypto/scatterwalk.h | 2 ++ > 2 files changed, 28 insertions(+) > > diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c index > ea5815c..bc3222d 100644 > --- a/crypto/scatterwalk.c > +++ b/crypto/scatterwalk.c > @@ -125,6 +125,32 @@ void scatterwalk_map_and_copy(void *buf, struct > scatterlist *sg, } EXPORT_SYMBOL_GPL(scatterwalk_map_and_copy); > > +void scatterwalk_sg_copychunks(struct scatter_walk *dest, > + struct scatter_walk *src, size_t nbytes) { > + for (;;) { > + unsigned int len_this_page = scatterwalk_pagelen(dest); > + u8 *vaddr; > + > + if (len_this_page > nbytes) > + len_this_page = nbytes; > + > + vaddr = scatterwalk_map(dest); > + scatterwalk_copychunks(vaddr, src, len_this_page, 0); > + scatterwalk_unmap(vaddr); > + > + scatterwalk_advance(dest, len_this_page); > + > + if (nbytes == len_this_page) > + break; > + > + nbytes -= len_this_page; > + > + scatterwalk_pagedone(dest, 0, 1); > + } > +} > +EXPORT_SYMBOL_GPL(scatterwalk_sg_copychunks); > + > int scatterwalk_bytes_sglen(struct scatterlist *sg, int num_bytes) { > int offset = 0, n = 0; > diff --git a/include/crypto/scatterwalk.h b/include/crypto/scatterwalk.h > index 35f99b6..8b799c5 100644 > --- a/include/crypto/scatterwalk.h > +++ b/include/crypto/scatterwalk.h > @@ -86,6 +86,8 @@ static inline void scatterwalk_unmap(void *vaddr) void > scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg); void > scatterwalk_copychunks(void *buf, struct scatter_walk *walk, > size_t nbytes, int out); > +void scatterwalk_sg_copychunks(struct scatter_walk *dest, > + struct scatter_walk *src, size_t nbytes); > void *scatterwalk_map(struct scatter_walk *walk); void > scatterwalk_done(struct scatter_walk *walk, int out, int more); > > -- > 1.8.3.1 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the > body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at > http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
