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crypto: glue_helper - Add skcipher xts helpers

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This patch adds xts helpers that use the skcipher interface rather
than blkcipher.  This will be used by aesni_intel.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
2016-11-22 20:08:29 +08:00
parent 043a44001b
commit 065ce32737
3 changed files with 112 additions and 3 deletions
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74
arch/x86/crypto/glue_helper.c
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@@ -27,10 +27,10 @@
#include <linux/module.h>
#include <crypto/b128ops.h>
#include <crypto/internal/skcipher.h>
#include <crypto/lrw.h>
#include <crypto/xts.h>
#include <asm/crypto/glue_helper.h>
#include <crypto/scatterwalk.h>
static int __glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx,
struct blkcipher_desc *desc,
@@ -339,6 +339,41 @@ done:
return nbytes;
}
static unsigned int __glue_xts_req_128bit(const struct common_glue_ctx *gctx,
void *ctx,
struct skcipher_walk *walk)
{
const unsigned int bsize = 128 / 8;
unsigned int nbytes = walk->nbytes;
u128 *src = walk->src.virt.addr;
u128 *dst = walk->dst.virt.addr;
unsigned int num_blocks, func_bytes;
unsigned int i;
/* Process multi-block batch */
for (i = 0; i < gctx->num_funcs; i++) {
num_blocks = gctx->funcs[i].num_blocks;
func_bytes = bsize * num_blocks;
if (nbytes >= func_bytes) {
do {
gctx->funcs[i].fn_u.xts(ctx, dst, src,
walk->iv);
src += num_blocks;
dst += num_blocks;
nbytes -= func_bytes;
} while (nbytes >= func_bytes);
if (nbytes < bsize)
goto done;
}
}
done:
return nbytes;
}
/* for implementations implementing faster XTS IV generator */
int glue_xts_crypt_128bit(const struct common_glue_ctx *gctx,
struct blkcipher_desc *desc, struct scatterlist *dst,
@@ -379,6 +414,43 @@ int glue_xts_crypt_128bit(const struct common_glue_ctx *gctx,
}
EXPORT_SYMBOL_GPL(glue_xts_crypt_128bit);
int glue_xts_req_128bit(const struct common_glue_ctx *gctx,
struct skcipher_request *req,
common_glue_func_t tweak_fn, void *tweak_ctx,
void *crypt_ctx)
{
const unsigned int bsize = 128 / 8;
struct skcipher_walk walk;
bool fpu_enabled = false;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, false);
nbytes = walk.nbytes;
if (!nbytes)
return err;
/* set minimum length to bsize, for tweak_fn */
fpu_enabled = glue_skwalk_fpu_begin(bsize, gctx->fpu_blocks_limit,
&walk, fpu_enabled,
nbytes < bsize ? bsize : nbytes);
/* calculate first value of T */
tweak_fn(tweak_ctx, walk.iv, walk.iv);
while (nbytes) {
nbytes = __glue_xts_req_128bit(gctx, crypt_ctx, &walk);
err = skcipher_walk_done(&walk, nbytes);
nbytes = walk.nbytes;
}
glue_fpu_end(fpu_enabled);
return err;
}
EXPORT_SYMBOL_GPL(glue_xts_req_128bit);
void glue_xts_crypt_128bit_one(void *ctx, u128 *dst, const u128 *src, le128 *iv,
common_glue_func_t fn)
{