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crypto: xts - remove xts_crypt()

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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>
This commit is contained in:
Eric Biggers 2018-02-19 23:48:24 -08:00 committed by Herbert Xu
parent 44893bc296
commit eb66ecd561
2 changed files with 0 additions and 89 deletions
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72
crypto/xts.c
View File

@ -357,78 +357,6 @@ static int decrypt(struct skcipher_request *req)
return do_decrypt(req, init_crypt(req, decrypt_done)); 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) static int init_tfm(struct crypto_skcipher *tfm)
{ {
struct skcipher_instance *inst = skcipher_alg_instance(tfm); struct skcipher_instance *inst = skcipher_alg_instance(tfm);

17
include/crypto/xts.h
View File

@ -6,27 +6,10 @@
#include <crypto/internal/skcipher.h> #include <crypto/internal/skcipher.h>
#include <linux/fips.h> #include <linux/fips.h>
struct scatterlist;
struct blkcipher_desc;
#define XTS_BLOCK_SIZE 16 #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)) #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, static inline int xts_check_key(struct crypto_tfm *tfm,
const u8 *key, unsigned int keylen) const u8 *key, unsigned int keylen)
{ {