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[Qemu-devel] [PATCH v2 5/8] crypto: convert xts_mult_x to use xts_uint12
From: |
Daniel P . Berrangé |
Subject: |
[Qemu-devel] [PATCH v2 5/8] crypto: convert xts_mult_x to use xts_uint128 type |
Date: |
Tue, 16 Oct 2018 11:09:15 +0100 |
Using 64-bit arithmetic increases the performance for xts-aes-128
when built with gcrypt:
Encrypt: 355 MB/s -> 545 MB/s
Decrypt: 362 MB/s -> 568 MB/s
Signed-off-by: Daniel P. Berrangé <address@hidden>
---
crypto/xts.c | 39 +++++++++++++++++++++++++++------------
1 file changed, 27 insertions(+), 12 deletions(-)
diff --git a/crypto/xts.c b/crypto/xts.c
index 2e3430672c..56c0e4e6ed 100644
--- a/crypto/xts.c
+++ b/crypto/xts.c
@@ -24,6 +24,7 @@
*/
#include "qemu/osdep.h"
+#include "qemu/bswap.h"
#include "crypto/xts.h"
typedef union {
@@ -39,19 +40,33 @@ static inline void xts_uint128_xor(xts_uint128 *D,
D->u[1] = S1->u[1] ^ S2->u[1];
}
-static void xts_mult_x(uint8_t *I)
+static inline void xts_uint128_cpu_to_les(xts_uint128 *v)
{
- int x;
- uint8_t t, tt;
+ cpu_to_le64s(&v->u[0]);
+ cpu_to_le64s(&v->u[1]);
+}
- for (x = t = 0; x < 16; x++) {
- tt = I[x] >> 7;
- I[x] = ((I[x] << 1) | t) & 0xFF;
- t = tt;
- }
- if (tt) {
- I[0] ^= 0x87;
+static inline void xts_uint128_le_to_cpus(xts_uint128 *v)
+{
+ le64_to_cpus(&v->u[0]);
+ le64_to_cpus(&v->u[1]);
+}
+
+static void xts_mult_x(xts_uint128 *I)
+{
+ uint64_t tt;
+
+ xts_uint128_cpu_to_les(I);
+
+ tt = I->u[0] >> 63;
+ I->u[0] = I->u[0] << 1;
+
+ if (I->u[1] >> 63) {
+ I->u[0] ^= 0x87;
}
+ I->u[1] = (I->u[1] << 1) | tt;
+
+ xts_uint128_le_to_cpus(I);
}
@@ -79,7 +94,7 @@ static void xts_tweak_encdec(const void *ctx,
xts_uint128_xor(dst, dst, iv);
/* LFSR the tweak */
- xts_mult_x(iv->b);
+ xts_mult_x(iv);
}
@@ -134,7 +149,7 @@ void xts_decrypt(const void *datactx,
if (mo > 0) {
xts_uint128 S, D;
memcpy(&CC, &T, XTS_BLOCK_SIZE);
- xts_mult_x(CC.b);
+ xts_mult_x(&CC);
/* PP = tweak decrypt block m-1 */
memcpy(&S, src, XTS_BLOCK_SIZE);
--
2.17.2
- [Qemu-devel] [PATCH v2 0/8] crypto: improve performance of XTS cipher mode, Daniel P . Berrangé, 2018/10/16
- [Qemu-devel] [PATCH v2 3/8] crypto: introduce a xts_uint128 data type, Daniel P . Berrangé, 2018/10/16
- [Qemu-devel] [PATCH v2 7/8] crypto: refactor XTS cipher mode test suite, Daniel P . Berrangé, 2018/10/16
- [Qemu-devel] [PATCH v2 1/8] crypto: expand algorithm coverage for cipher benchmark, Daniel P . Berrangé, 2018/10/16
- [Qemu-devel] [PATCH v2 8/8] crypto: add testing for unaligned buffers with XTS cipher mode, Daniel P . Berrangé, 2018/10/16