From: Eric Biggers <ebigg...@google.com>
Now that all users of xts_crypt() have been removed in favor of the XTS
template wrapping an ECB mode algorithm, remove xts_crypt().
Signed-off-by: Eric Biggers <ebigg...@google.com>
---
crypto/xts.c | 72 ----------------------------------------------------
include/crypto/xts.h | 17 -------------
2 files changed, 89 deletions(-)
diff --git a/crypto/xts.c b/crypto/xts.c
index f317c48b5e432..12284183bd20a 100644
--- a/crypto/xts.c
+++ b/crypto/xts.c
@@ -357,78 +357,6 @@ static int decrypt(struct skcipher_request *req)
return do_decrypt(req, init_crypt(req, decrypt_done));
}
-int xts_crypt(struct blkcipher_desc *desc, struct scatterlist *sdst,
- struct scatterlist *ssrc, unsigned int nbytes,
- struct xts_crypt_req *req)
-{
- const unsigned int bsize = XTS_BLOCK_SIZE;
- const unsigned int max_blks = req->tbuflen / bsize;
- struct blkcipher_walk walk;
- unsigned int nblocks;
- le128 *src, *dst, *t;
- le128 *t_buf = req->tbuf;
- int err, i;
-
- BUG_ON(max_blks < 1);
-
- blkcipher_walk_init(&walk, sdst, ssrc, nbytes);
-
- err = blkcipher_walk_virt(desc, &walk);
- nbytes = walk.nbytes;
- if (!nbytes)
- return err;
-
- nblocks = min(nbytes / bsize, max_blks);
- src = (le128 *)walk.src.virt.addr;
- dst = (le128 *)walk.dst.virt.addr;
-
- /* calculate first value of T */
- req->tweak_fn(req->tweak_ctx, (u8 *)&t_buf[0], walk.iv);
-
- i = 0;
- goto first;
-
- for (;;) {
- do {
- for (i = 0; i < nblocks; i++) {
- gf128mul_x_ble(&t_buf[i], t);
-first:
- t = &t_buf[i];
-
- /* PP <- T xor P */
- le128_xor(dst + i, t, src + i);
- }
-
- /* CC <- E(Key2,PP) */
- req->crypt_fn(req->crypt_ctx, (u8 *)dst,
- nblocks * bsize);
-
- /* C <- T xor CC */
- for (i = 0; i < nblocks; i++)
- le128_xor(dst + i, dst + i, &t_buf[i]);
-
- src += nblocks;
- dst += nblocks;
- nbytes -= nblocks * bsize;
- nblocks = min(nbytes / bsize, max_blks);
- } while (nblocks > 0);
-
- *(le128 *)walk.iv = *t;
-
- err = blkcipher_walk_done(desc, &walk, nbytes);
- nbytes = walk.nbytes;
- if (!nbytes)
- break;
-
- nblocks = min(nbytes / bsize, max_blks);
- src = (le128 *)walk.src.virt.addr;
- dst = (le128 *)walk.dst.virt.addr;
- }
-
- return err;
-}
-EXPORT_SYMBOL_GPL(xts_crypt);
-
static int init_tfm(struct crypto_skcipher *tfm)
{
struct skcipher_instance *inst = skcipher_alg_instance(tfm);
diff --git a/include/crypto/xts.h b/include/crypto/xts.h
index 322aab6e78a71..34d94c95445a5 100644
--- a/include/crypto/xts.h
+++ b/include/crypto/xts.h
@@ -6,27 +6,10 @@
#include <crypto/internal/skcipher.h>
#include <linux/fips.h>
-struct scatterlist;
-struct blkcipher_desc;
-
#define XTS_BLOCK_SIZE 16
-struct xts_crypt_req {
- le128 *tbuf;
- unsigned int tbuflen;
-
- void *tweak_ctx;
- void (*tweak_fn)(void *ctx, u8* dst, const u8* src);
- void *crypt_ctx;
- void (*crypt_fn)(void *ctx, u8 *blks, unsigned int nbytes);
-};
-
#define XTS_TWEAK_CAST(x) ((void (*)(void *, u8*, const u8*))(x))
-int xts_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
- struct scatterlist *src, unsigned int nbytes,
- struct xts_crypt_req *req);
-
static inline int xts_check_key(struct crypto_tfm *tfm,
const u8 *key, unsigned int keylen)
{
--
2.16.2
