> -----Original Message-----
> From: linux-crypto-ow...@vger.kernel.org [mailto:linux-crypto-
> ow...@vger.kernel.org] On Behalf Of Tudor Ambarus
> Sent: Wednesday, March 23, 2016 5:06 PM
> To: herb...@gondor.apana.org.au
> Cc: tadeusz.st...@intel.com; linux-crypto@vger.kernel.org;
> smuel...@chronox.de; Horia Ioan Geanta Neag <horia.gea...@nxp.com>;
> Tudor-Dan Ambarus <tudor-dan.amba...@nxp.com>
> 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.amba...@nxp.com>
Acked-by: Cristian Stoica <cristian.sto...@nxp.com>
> ---
> 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
>
> --
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