crypto: xts - remove xts_crypt()

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 <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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);

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)
 {