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crypto: gf128mul - switch gf128mul_x_ble to le128

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Currently, gf128mul_x_ble works with pointers to be128, even though it
actually interprets the words as little-endian. Consequently, it uses
cpu_to_le64/le64_to_cpu on fields of type __be64, which is incorrect.

This patch fixes that by changing the function to accept pointers to
le128 and updating all users accordingly.

Signed-off-by: Ondrej Mosnacek <omosnacek@gmail.com>
Reviewd-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ondrej Mosnáček 2017-04-02 21:19:14 +02:00 committed by Herbert Xu
parent acb9b159c7
commit e55318c84f
6 changed files with 30 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/crypto/camellia_glue.c
View File

@ -1522,7 +1522,7 @@ static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct camellia_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
be128 buf[2 * 4];
le128 buf[2 * 4];
struct xts_crypt_req req = {
.tbuf = buf,
.tbuflen = sizeof(buf),
@ -1540,7 +1540,7 @@ static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct camellia_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
be128 buf[2 * 4];
le128 buf[2 * 4];
struct xts_crypt_req req = {
.tbuf = buf,
.tbuflen = sizeof(buf),

4
arch/x86/crypto/serpent_sse2_glue.c
View File

@ -328,7 +328,7 @@ static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
be128 buf[SERPENT_PARALLEL_BLOCKS];
le128 buf[SERPENT_PARALLEL_BLOCKS];
struct crypt_priv crypt_ctx = {
.ctx = &ctx->crypt_ctx,
.fpu_enabled = false,
@ -355,7 +355,7 @@ static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
be128 buf[SERPENT_PARALLEL_BLOCKS];
le128 buf[SERPENT_PARALLEL_BLOCKS];
struct crypt_priv crypt_ctx = {
.ctx = &ctx->crypt_ctx,
.fpu_enabled = false,

4
arch/x86/crypto/twofish_glue_3way.c
View File

@ -296,7 +296,7 @@ static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct twofish_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
be128 buf[3];
le128 buf[3];
struct xts_crypt_req req = {
.tbuf = buf,
.tbuflen = sizeof(buf),
@ -314,7 +314,7 @@ static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct twofish_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
be128 buf[3];
le128 buf[3];
struct xts_crypt_req req = {
.tbuf = buf,
.tbuflen = sizeof(buf),

38
crypto/xts.c
View File

@ -39,11 +39,11 @@ struct xts_instance_ctx {
};
struct rctx {
be128 buf[XTS_BUFFER_SIZE / sizeof(be128)];
le128 buf[XTS_BUFFER_SIZE / sizeof(le128)];
be128 t;
le128 t;
be128 *ext;
le128 *ext;
struct scatterlist srcbuf[2];
struct scatterlist dstbuf[2];
@ -99,7 +99,7 @@ static int setkey(struct crypto_skcipher *parent, const u8 *key,
static int post_crypt(struct skcipher_request *req)
{
struct rctx *rctx = skcipher_request_ctx(req);
be128 *buf = rctx->ext ?: rctx->buf;
le128 *buf = rctx->ext ?: rctx->buf;
struct skcipher_request *subreq;
const int bs = XTS_BLOCK_SIZE;
struct skcipher_walk w;
@ -112,12 +112,12 @@ static int post_crypt(struct skcipher_request *req)
while (w.nbytes) {
unsigned int avail = w.nbytes;
be128 *wdst;
le128 *wdst;
wdst = w.dst.virt.addr;
do {
be128_xor(wdst, buf++, wdst);
le128_xor(wdst, buf++, wdst);
wdst++;
} while ((avail -= bs) >= bs);
@ -150,7 +150,7 @@ out:
static int pre_crypt(struct skcipher_request *req)
{
struct rctx *rctx = skcipher_request_ctx(req);
be128 *buf = rctx->ext ?: rctx->buf;
le128 *buf = rctx->ext ?: rctx->buf;
struct skcipher_request *subreq;
const int bs = XTS_BLOCK_SIZE;
struct skcipher_walk w;
@ -174,15 +174,15 @@ static int pre_crypt(struct skcipher_request *req)
while (w.nbytes) {
unsigned int avail = w.nbytes;
be128 *wsrc;
be128 *wdst;
le128 *wsrc;
le128 *wdst;
wsrc = w.src.virt.addr;
wdst = w.dst.virt.addr;
do {
*buf++ = rctx->t;
be128_xor(wdst++, &rctx->t, wsrc++);
le128_xor(wdst++, &rctx->t, wsrc++);
gf128mul_x_ble(&rctx->t, &rctx->t);
} while ((avail -= bs) >= bs);
@ -353,8 +353,8 @@ int xts_crypt(struct blkcipher_desc *desc, struct scatterlist *sdst,
const unsigned int max_blks = req->tbuflen / bsize;
struct blkcipher_walk walk;
unsigned int nblocks;
be128 *src, *dst, *t;
be128 *t_buf = req->tbuf;
le128 *src, *dst, *t;
le128 *t_buf = req->tbuf;
int err, i;
BUG_ON(max_blks < 1);
@ -367,8 +367,8 @@ int xts_crypt(struct blkcipher_desc *desc, struct scatterlist *sdst,
return err;
nblocks = min(nbytes / bsize, max_blks);
src = (be128 *)walk.src.virt.addr;
dst = (be128 *)walk.dst.virt.addr;
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);
@ -384,7 +384,7 @@ first:
t = &t_buf[i];
/* PP <- T xor P */
be128_xor(dst + i, t, src + i);
le128_xor(dst + i, t, src + i);
}
/* CC <- E(Key2,PP) */
@ -393,7 +393,7 @@ first:
/* C <- T xor CC */
for (i = 0; i < nblocks; i++)
be128_xor(dst + i, dst + i, &t_buf[i]);
le128_xor(dst + i, dst + i, &t_buf[i]);
src += nblocks;
dst += nblocks;
@ -401,7 +401,7 @@ first:
nblocks = min(nbytes / bsize, max_blks);
} while (nblocks > 0);
*(be128 *)walk.iv = *t;
*(le128 *)walk.iv = *t;
err = blkcipher_walk_done(desc, &walk, nbytes);
nbytes = walk.nbytes;
@ -409,8 +409,8 @@ first:
break;
nblocks = min(nbytes / bsize, max_blks);
src = (be128 *)walk.src.virt.addr;
dst = (be128 *)walk.dst.virt.addr;
src = (le128 *)walk.src.virt.addr;
dst = (le128 *)walk.dst.virt.addr;
}
return err;

8
include/crypto/gf128mul.h
View File

@ -205,16 +205,16 @@ static inline void gf128mul_x_bbe(be128 *r, const be128 *x)
}
/* needed by XTS */
static inline void gf128mul_x_ble(be128 *r, const be128 *x)
static inline void gf128mul_x_ble(le128 *r, const le128 *x)
{
u64 a = le64_to_cpu(x->a);
u64 b = le64_to_cpu(x->b);
/* equivalent to gf128mul_table_be[b >> 63] (see crypto/gf128mul.c): */
u64 _tt = gf128mul_mask_from_bit(b, 63) & 0x87;
u64 _tt = gf128mul_mask_from_bit(a, 63) & 0x87;
r->a = cpu_to_le64((a << 1) ^ _tt);
r->b = cpu_to_le64((b << 1) | (a >> 63));
r->a = cpu_to_le64((a << 1) | (b >> 63));
r->b = cpu_to_le64((b << 1) ^ _tt);
}
/* 4k table optimization */

2
include/crypto/xts.h
View File

@ -11,7 +11,7 @@ struct blkcipher_desc;
#define XTS_BLOCK_SIZE 16
struct xts_crypt_req {
be128 *tbuf;
le128 *tbuf;
unsigned int tbuflen;
void *tweak_ctx;