* [PATCH 1/2] crypto: lrw - Optimize tweak computation
2018-09-07 11:27 [PATCH 0/2] crpyto: lrw - Simplify and optimize the LRW template Ondrej Mosnacek
@ 2018-09-07 11:27 ` Ondrej Mosnacek
2018-09-07 11:27 ` [PATCH 2/2] crypto: lrw - Do not use auxiliary buffer Ondrej Mosnacek
1 sibling, 0 replies; 3+ messages in thread
From: Ondrej Mosnacek @ 2018-09-07 11:27 UTC (permalink / raw)
To: Herbert Xu
Cc: Eric Biggers, dm-devel, Mikulas Patocka, linux-crypto,
Ondrej Mosnacek
This patch rewrites the tweak computation to a slightly simpler method
that performs less bswaps. Based on performance measurements the new
code seems to provide slightly better performance than the old one.
PERFORMANCE MEASUREMENTS (x86_64)
Performed using: https://gitlab.com/omos/linux-crypto-bench
Crypto driver used: lrw(ecb-aes-aesni)
Before:
ALGORITHM KEY (b) DATA (B) TIME ENC (ns) TIME DEC (ns)
lrw(aes) 256 64 204 286
lrw(aes) 320 64 227 203
lrw(aes) 384 64 208 204
lrw(aes) 256 512 441 439
lrw(aes) 320 512 456 455
lrw(aes) 384 512 469 483
lrw(aes) 256 4096 2136 2190
lrw(aes) 320 4096 2161 2213
lrw(aes) 384 4096 2295 2369
lrw(aes) 256 16384 7692 7868
lrw(aes) 320 16384 8230 8691
lrw(aes) 384 16384 8971 8813
lrw(aes) 256 32768 15336 15560
lrw(aes) 320 32768 16410 16346
lrw(aes) 384 32768 18023 17465
After:
ALGORITHM KEY (b) DATA (B) TIME ENC (ns) TIME DEC (ns)
lrw(aes) 256 64 200 203
lrw(aes) 320 64 202 204
lrw(aes) 384 64 204 205
lrw(aes) 256 512 415 415
lrw(aes) 320 512 432 440
lrw(aes) 384 512 449 451
lrw(aes) 256 4096 1838 1995
lrw(aes) 320 4096 2123 1980
lrw(aes) 384 4096 2100 2119
lrw(aes) 256 16384 7183 6954
lrw(aes) 320 16384 7844 7631
lrw(aes) 384 16384 8256 8126
lrw(aes) 256 32768 14772 14484
lrw(aes) 320 32768 15281 15431
lrw(aes) 384 32768 16469 16293
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
---
crypto/lrw.c | 49 +++++++++++++++++++++++++------------------------
1 file changed, 25 insertions(+), 24 deletions(-)
diff --git a/crypto/lrw.c b/crypto/lrw.c
index 393a782679c7..b4f30b6f16d6 100644
--- a/crypto/lrw.c
+++ b/crypto/lrw.c
@@ -120,30 +120,19 @@ static int setkey(struct crypto_skcipher *parent, const u8 *key,
return 0;
}
-static inline void inc(be128 *iv)
+static int next_index(u32 *counter)
{
- be64_add_cpu(&iv->b, 1);
- if (!iv->b)
- be64_add_cpu(&iv->a, 1);
-}
-
-/* this returns the number of consequative 1 bits starting
- * from the right, get_index128(00 00 00 00 00 00 ... 00 00 10 FB) = 2 */
-static inline int get_index128(be128 *block)
-{
- int x;
- __be32 *p = (__be32 *) block;
-
- for (p += 3, x = 0; x < 128; p--, x += 32) {
- u32 val = be32_to_cpup(p);
-
- if (!~val)
- continue;
+ int i, res = 0;
- return x + ffz(val);
+ for (i = 0; i < 4; i++) {
+ if (counter[i] + 1 != 0) {
+ res += ffz(counter[i]++);
+ break;
+ }
+ counter[i] = 0;
+ res += 32;
}
-
- return x;
+ return res;
}
static int post_crypt(struct skcipher_request *req)
@@ -209,8 +198,9 @@ static int pre_crypt(struct skcipher_request *req)
struct scatterlist *sg;
unsigned cryptlen;
unsigned offset;
- be128 *iv;
bool more;
+ __u32 *iv;
+ u32 counter[4];
int err;
subreq = &rctx->subreq;
@@ -227,6 +217,11 @@ static int pre_crypt(struct skcipher_request *req)
err = skcipher_walk_virt(&w, subreq, false);
iv = w.iv;
+ counter[0] = be32_to_cpu(iv[3]);
+ counter[1] = be32_to_cpu(iv[2]);
+ counter[2] = be32_to_cpu(iv[1]);
+ counter[3] = be32_to_cpu(iv[0]);
+
while (w.nbytes) {
unsigned int avail = w.nbytes;
be128 *wsrc;
@@ -242,10 +237,16 @@ static int pre_crypt(struct skcipher_request *req)
/* T <- I*Key2, using the optimization
* discussed in the specification */
be128_xor(&rctx->t, &rctx->t,
- &ctx->mulinc[get_index128(iv)]);
- inc(iv);
+ &ctx->mulinc[next_index(counter)]);
} while ((avail -= bs) >= bs);
+ if (w.nbytes == w.total) {
+ iv[0] = cpu_to_be32(counter[3]);
+ iv[1] = cpu_to_be32(counter[2]);
+ iv[2] = cpu_to_be32(counter[1]);
+ iv[3] = cpu_to_be32(counter[0]);
+ }
+
err = skcipher_walk_done(&w, avail);
}
--
2.17.1
^ permalink raw reply related [flat|nested] 3+ messages in thread* [PATCH 2/2] crypto: lrw - Do not use auxiliary buffer
2018-09-07 11:27 [PATCH 0/2] crpyto: lrw - Simplify and optimize the LRW template Ondrej Mosnacek
2018-09-07 11:27 ` [PATCH 1/2] crypto: lrw - Optimize tweak computation Ondrej Mosnacek
@ 2018-09-07 11:27 ` Ondrej Mosnacek
1 sibling, 0 replies; 3+ messages in thread
From: Ondrej Mosnacek @ 2018-09-07 11:27 UTC (permalink / raw)
To: Herbert Xu
Cc: Eric Biggers, dm-devel, Mikulas Patocka, linux-crypto,
Ondrej Mosnacek
This patch simplifies the LRW template to recompute the LRW tweaks from
scratch in the second pass and thus also removes the need to allocate a
dynamic buffer using kmalloc().
As discussed at [1], the use of kmalloc causes deadlocks with dm-crypt.
PERFORMANCE MEASUREMENTS (x86_64)
Performed using: https://gitlab.com/omos/linux-crypto-bench
Crypto driver used: lrw(ecb-aes-aesni)
The results show that the new code has about the same performance as the
old code. For 512-byte message it seems to be even slightly faster, but
that might be just noise.
Before:
ALGORITHM KEY (b) DATA (B) TIME ENC (ns) TIME DEC (ns)
lrw(aes) 256 64 200 203
lrw(aes) 320 64 202 204
lrw(aes) 384 64 204 205
lrw(aes) 256 512 415 415
lrw(aes) 320 512 432 440
lrw(aes) 384 512 449 451
lrw(aes) 256 4096 1838 1995
lrw(aes) 320 4096 2123 1980
lrw(aes) 384 4096 2100 2119
lrw(aes) 256 16384 7183 6954
lrw(aes) 320 16384 7844 7631
lrw(aes) 384 16384 8256 8126
lrw(aes) 256 32768 14772 14484
lrw(aes) 320 32768 15281 15431
lrw(aes) 384 32768 16469 16293
After:
ALGORITHM KEY (b) DATA (B) TIME ENC (ns) TIME DEC (ns)
lrw(aes) 256 64 197 196
lrw(aes) 320 64 200 197
lrw(aes) 384 64 203 199
lrw(aes) 256 512 385 380
lrw(aes) 320 512 401 395
lrw(aes) 384 512 415 415
lrw(aes) 256 4096 1869 1846
lrw(aes) 320 4096 2080 1981
lrw(aes) 384 4096 2160 2109
lrw(aes) 256 16384 7077 7127
lrw(aes) 320 16384 7807 7766
lrw(aes) 384 16384 8108 8357
lrw(aes) 256 32768 14111 14454
lrw(aes) 320 32768 15268 15082
lrw(aes) 384 32768 16581 16250
[1] https://lkml.org/lkml/2018/8/23/1315
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
---
crypto/lrw.c | 274 ++++++++-------------------------------------------
1 file changed, 42 insertions(+), 232 deletions(-)
diff --git a/crypto/lrw.c b/crypto/lrw.c
index b4f30b6f16d6..990eb0f2f51e 100644
--- a/crypto/lrw.c
+++ b/crypto/lrw.c
@@ -29,8 +29,6 @@
#include <crypto/b128ops.h>
#include <crypto/gf128mul.h>
-#define LRW_BUFFER_SIZE 128u
-
#define LRW_BLOCK_SIZE 16
struct priv {
@@ -56,19 +54,7 @@ struct priv {
};
struct rctx {
- be128 buf[LRW_BUFFER_SIZE / sizeof(be128)];
-
- be128 t;
-
- be128 *ext;
-
- struct scatterlist srcbuf[2];
- struct scatterlist dstbuf[2];
- struct scatterlist *src;
- struct scatterlist *dst;
-
- unsigned int left;
-
+ be128 t, orig_iv;
struct skcipher_request subreq;
};
@@ -135,85 +121,26 @@ static int next_index(u32 *counter)
return res;
}
-static int post_crypt(struct skcipher_request *req)
+/*
+ * We compute the tweak masks twice (both before and after the ECB encryption or
+ * decryption) to avoid having to allocate a temporary buffer and/or make
+ * mutliple calls to the 'ecb(..)' instance, which usually would be slower than
+ * just doing the gf128mul_x_ble() calls again.
+ */
+static int xor_tweak(struct skcipher_request *req, struct skcipher_request *subreq)
{
- struct rctx *rctx = skcipher_request_ctx(req);
- be128 *buf = rctx->ext ?: rctx->buf;
- struct skcipher_request *subreq;
const int bs = LRW_BLOCK_SIZE;
- struct skcipher_walk w;
- struct scatterlist *sg;
- unsigned offset;
- int err;
-
- subreq = &rctx->subreq;
- err = skcipher_walk_virt(&w, subreq, false);
-
- while (w.nbytes) {
- unsigned int avail = w.nbytes;
- be128 *wdst;
-
- wdst = w.dst.virt.addr;
-
- do {
- be128_xor(wdst, buf++, wdst);
- wdst++;
- } while ((avail -= bs) >= bs);
-
- err = skcipher_walk_done(&w, avail);
- }
-
- rctx->left -= subreq->cryptlen;
-
- if (err || !rctx->left)
- goto out;
-
- rctx->dst = rctx->dstbuf;
-
- scatterwalk_done(&w.out, 0, 1);
- sg = w.out.sg;
- offset = w.out.offset;
-
- if (rctx->dst != sg) {
- rctx->dst[0] = *sg;
- sg_unmark_end(rctx->dst);
- scatterwalk_crypto_chain(rctx->dst, sg_next(sg), 2);
- }
- rctx->dst[0].length -= offset - sg->offset;
- rctx->dst[0].offset = offset;
-
-out:
- return err;
-}
-
-static int pre_crypt(struct skcipher_request *req)
-{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct rctx *rctx = skcipher_request_ctx(req);
struct priv *ctx = crypto_skcipher_ctx(tfm);
- be128 *buf = rctx->ext ?: rctx->buf;
- struct skcipher_request *subreq;
- const int bs = LRW_BLOCK_SIZE;
+ struct rctx *rctx = skcipher_request_ctx(req);
+ be128 t = rctx->t;
struct skcipher_walk w;
- struct scatterlist *sg;
- unsigned cryptlen;
- unsigned offset;
- bool more;
__u32 *iv;
u32 counter[4];
int err;
- subreq = &rctx->subreq;
skcipher_request_set_tfm(subreq, tfm);
- cryptlen = subreq->cryptlen;
- more = rctx->left > cryptlen;
- if (!more)
- cryptlen = rctx->left;
-
- skcipher_request_set_crypt(subreq, rctx->src, rctx->dst,
- cryptlen, req->iv);
-
err = skcipher_walk_virt(&w, subreq, false);
iv = w.iv;
@@ -231,13 +158,11 @@ static int pre_crypt(struct skcipher_request *req)
wdst = w.dst.virt.addr;
do {
- *buf++ = rctx->t;
- be128_xor(wdst++, &rctx->t, wsrc++);
+ be128_xor(wdst++, &t, wsrc++);
/* T <- I*Key2, using the optimization
* discussed in the specification */
- be128_xor(&rctx->t, &rctx->t,
- &ctx->mulinc[next_index(counter)]);
+ be128_xor(&t, &t, &ctx->mulinc[next_index(counter)]);
} while ((avail -= bs) >= bs);
if (w.nbytes == w.total) {
@@ -250,175 +175,60 @@ static int pre_crypt(struct skcipher_request *req)
err = skcipher_walk_done(&w, avail);
}
- skcipher_request_set_tfm(subreq, ctx->child);
- skcipher_request_set_crypt(subreq, rctx->dst, rctx->dst,
- cryptlen, NULL);
-
- if (err || !more)
- goto out;
-
- rctx->src = rctx->srcbuf;
-
- scatterwalk_done(&w.in, 0, 1);
- sg = w.in.sg;
- offset = w.in.offset;
-
- if (rctx->src != sg) {
- rctx->src[0] = *sg;
- sg_unmark_end(rctx->src);
- scatterwalk_crypto_chain(rctx->src, sg_next(sg), 2);
- }
- rctx->src[0].length -= offset - sg->offset;
- rctx->src[0].offset = offset;
-
-out:
return err;
}
-static int init_crypt(struct skcipher_request *req, crypto_completion_t done)
-{
- struct priv *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
- struct rctx *rctx = skcipher_request_ctx(req);
- struct skcipher_request *subreq;
- gfp_t gfp;
-
- subreq = &rctx->subreq;
- skcipher_request_set_callback(subreq, req->base.flags, done, req);
-
- gfp = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
- GFP_ATOMIC;
- rctx->ext = NULL;
-
- subreq->cryptlen = LRW_BUFFER_SIZE;
- if (req->cryptlen > LRW_BUFFER_SIZE) {
- unsigned int n = min(req->cryptlen, (unsigned int)PAGE_SIZE);
-
- rctx->ext = kmalloc(n, gfp);
- if (rctx->ext)
- subreq->cryptlen = n;
- }
-
- rctx->src = req->src;
- rctx->dst = req->dst;
- rctx->left = req->cryptlen;
-
- /* calculate first value of T */
- memcpy(&rctx->t, req->iv, sizeof(rctx->t));
-
- /* T <- I*Key2 */
- gf128mul_64k_bbe(&rctx->t, ctx->table);
-
- return 0;
-}
-
-static void exit_crypt(struct skcipher_request *req)
+static void crypt_done(struct crypto_async_request *areq, int err)
{
+ struct skcipher_request *req = areq->data;
struct rctx *rctx = skcipher_request_ctx(req);
+ struct skcipher_request *subreq = &rctx->subreq;
- rctx->left = 0;
+ if (!err)
+ err = xor_tweak(req, subreq);
- if (rctx->ext)
- kzfree(rctx->ext);
+ skcipher_request_complete(req, err);
}
-static int do_encrypt(struct skcipher_request *req, int err)
+static void init_crypt(struct skcipher_request *req)
{
+ struct priv *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
struct rctx *rctx = skcipher_request_ctx(req);
- struct skcipher_request *subreq;
+ struct skcipher_request *subreq = &rctx->subreq;
- subreq = &rctx->subreq;
-
- while (!err && rctx->left) {
- err = pre_crypt(req) ?:
- crypto_skcipher_encrypt(subreq) ?:
- post_crypt(req);
-
- if (err == -EINPROGRESS || err == -EBUSY)
- return err;
- }
-
- exit_crypt(req);
- return err;
-}
-
-static void encrypt_done(struct crypto_async_request *areq, int err)
-{
- struct skcipher_request *req = areq->data;
- struct skcipher_request *subreq;
- struct rctx *rctx;
-
- rctx = skcipher_request_ctx(req);
-
- if (err == -EINPROGRESS) {
- if (rctx->left != req->cryptlen)
- return;
- goto out;
- }
-
- subreq = &rctx->subreq;
- subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG;
+ skcipher_request_set_tfm(subreq, ctx->child);
+ skcipher_request_set_callback(subreq, req->base.flags, crypt_done, req);
+ skcipher_request_set_crypt(subreq, req->dst, req->dst,
+ req->cryptlen, &rctx->orig_iv);
- err = do_encrypt(req, err ?: post_crypt(req));
- if (rctx->left)
- return;
+ /* calculate first value of T */
+ memcpy(&rctx->orig_iv, req->iv, sizeof(rctx->t));
+ rctx->t = rctx->orig_iv;
-out:
- skcipher_request_complete(req, err);
+ /* T <- I*Key2 */
+ gf128mul_64k_bbe(&rctx->t, ctx->table);
}
static int encrypt(struct skcipher_request *req)
-{
- return do_encrypt(req, init_crypt(req, encrypt_done));
-}
-
-static int do_decrypt(struct skcipher_request *req, int err)
{
struct rctx *rctx = skcipher_request_ctx(req);
- struct skcipher_request *subreq;
-
- subreq = &rctx->subreq;
+ struct skcipher_request *subreq = &rctx->subreq;
- while (!err && rctx->left) {
- err = pre_crypt(req) ?:
- crypto_skcipher_decrypt(subreq) ?:
- post_crypt(req);
-
- if (err == -EINPROGRESS || err == -EBUSY)
- return err;
- }
-
- exit_crypt(req);
- return err;
-}
-
-static void decrypt_done(struct crypto_async_request *areq, int err)
-{
- struct skcipher_request *req = areq->data;
- struct skcipher_request *subreq;
- struct rctx *rctx;
-
- rctx = skcipher_request_ctx(req);
-
- if (err == -EINPROGRESS) {
- if (rctx->left != req->cryptlen)
- return;
- goto out;
- }
-
- subreq = &rctx->subreq;
- subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG;
-
- err = do_decrypt(req, err ?: post_crypt(req));
- if (rctx->left)
- return;
-
-out:
- skcipher_request_complete(req, err);
+ init_crypt(req);
+ return xor_tweak(req, req) ?:
+ crypto_skcipher_encrypt(subreq) ?:
+ xor_tweak(req, subreq);
}
static int decrypt(struct skcipher_request *req)
{
- return do_decrypt(req, init_crypt(req, decrypt_done));
+ struct rctx *rctx = skcipher_request_ctx(req);
+ struct skcipher_request *subreq = &rctx->subreq;
+
+ init_crypt(req);
+ return xor_tweak(req, req) ?:
+ crypto_skcipher_decrypt(subreq) ?:
+ xor_tweak(req, subreq);
}
static int init_tfm(struct crypto_skcipher *tfm)
--
2.17.1
^ permalink raw reply related [flat|nested] 3+ messages in thread