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From e485d0702e2acf9b83aaf42f4cc62d804c1c282a Mon Sep 17 00:00:00 2001
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From: "Daniel P. Berrange" <berrange@redhat.com>
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Date: Wed, 24 Apr 2019 09:56:38 +0100
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Subject: [PATCH 4/9] crypto: introduce a xts_uint128 data type
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Daniel P. Berrange <berrange@redhat.com>
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Message-id: <20190424095643.796-5-berrange@redhat.com>
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Patchwork-id: 85882
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O-Subject: [RHEL-8.1.0 qemu-kvm PATCH 4/9] crypto: introduce a xts_uint128 data type
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Bugzilla: 1680231
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Eric Blake <eblake@redhat.com>
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The new type is designed to allow use of 64-bit arithmetic instead
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of operating 1-byte at a time. The following patches will use this to
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improve performance.
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Reviewed-by: Alberto Garcia <berto@igalia.com>
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Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
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(cherry picked from commit cc36930e4077eb3dbee6cd30d2d826ec62b3490a)
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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crypto/xts.c | 46 ++++++++++++++++++++++++++--------------------
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1 file changed, 26 insertions(+), 20 deletions(-)
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diff --git a/crypto/xts.c b/crypto/xts.c
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index 3c1a92f..bee23f8 100644
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--- a/crypto/xts.c
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+++ b/crypto/xts.c
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@@ -26,6 +26,12 @@
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#include "qemu/osdep.h"
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#include "crypto/xts.h"
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+typedef union {
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+ uint8_t b[XTS_BLOCK_SIZE];
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+ uint64_t u[2];
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+} xts_uint128;
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+
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+
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static void xts_mult_x(uint8_t *I)
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{
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int x;
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@@ -85,7 +91,7 @@ void xts_decrypt(const void *datactx,
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uint8_t *dst,
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const uint8_t *src)
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{
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- uint8_t PP[XTS_BLOCK_SIZE], CC[XTS_BLOCK_SIZE], T[XTS_BLOCK_SIZE];
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+ xts_uint128 PP, CC, T;
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unsigned long i, m, mo, lim;
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/* get number of blocks */
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@@ -102,10 +108,10 @@ void xts_decrypt(const void *datactx,
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}
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/* encrypt the iv */
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- encfunc(tweakctx, XTS_BLOCK_SIZE, T, iv);
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+ encfunc(tweakctx, XTS_BLOCK_SIZE, T.b, iv);
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for (i = 0; i < lim; i++) {
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- xts_tweak_encdec(datactx, decfunc, src, dst, T);
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+ xts_tweak_encdec(datactx, decfunc, src, dst, T.b);
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src += XTS_BLOCK_SIZE;
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dst += XTS_BLOCK_SIZE;
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@@ -113,27 +119,27 @@ void xts_decrypt(const void *datactx,
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/* if length is not a multiple of XTS_BLOCK_SIZE then */
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if (mo > 0) {
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- memcpy(CC, T, XTS_BLOCK_SIZE);
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- xts_mult_x(CC);
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+ memcpy(&CC, &T, XTS_BLOCK_SIZE);
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+ xts_mult_x(CC.b);
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/* PP = tweak decrypt block m-1 */
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- xts_tweak_encdec(datactx, decfunc, src, PP, CC);
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+ xts_tweak_encdec(datactx, decfunc, src, PP.b, CC.b);
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/* Pm = first length % XTS_BLOCK_SIZE bytes of PP */
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for (i = 0; i < mo; i++) {
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- CC[i] = src[XTS_BLOCK_SIZE + i];
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- dst[XTS_BLOCK_SIZE + i] = PP[i];
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+ CC.b[i] = src[XTS_BLOCK_SIZE + i];
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+ dst[XTS_BLOCK_SIZE + i] = PP.b[i];
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}
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for (; i < XTS_BLOCK_SIZE; i++) {
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- CC[i] = PP[i];
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+ CC.b[i] = PP.b[i];
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}
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/* Pm-1 = Tweak uncrypt CC */
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- xts_tweak_encdec(datactx, decfunc, CC, dst, T);
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+ xts_tweak_encdec(datactx, decfunc, CC.b, dst, T.b);
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}
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/* Decrypt the iv back */
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- decfunc(tweakctx, XTS_BLOCK_SIZE, iv, T);
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+ decfunc(tweakctx, XTS_BLOCK_SIZE, iv, T.b);
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}
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@@ -146,7 +152,7 @@ void xts_encrypt(const void *datactx,
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uint8_t *dst,
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const uint8_t *src)
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{
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- uint8_t PP[XTS_BLOCK_SIZE], CC[XTS_BLOCK_SIZE], T[XTS_BLOCK_SIZE];
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+ xts_uint128 PP, CC, T;
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unsigned long i, m, mo, lim;
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/* get number of blocks */
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@@ -163,10 +169,10 @@ void xts_encrypt(const void *datactx,
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}
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/* encrypt the iv */
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- encfunc(tweakctx, XTS_BLOCK_SIZE, T, iv);
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+ encfunc(tweakctx, XTS_BLOCK_SIZE, T.b, iv);
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for (i = 0; i < lim; i++) {
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- xts_tweak_encdec(datactx, encfunc, src, dst, T);
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+ xts_tweak_encdec(datactx, encfunc, src, dst, T.b);
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dst += XTS_BLOCK_SIZE;
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src += XTS_BLOCK_SIZE;
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@@ -175,22 +181,22 @@ void xts_encrypt(const void *datactx,
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/* if length is not a multiple of XTS_BLOCK_SIZE then */
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if (mo > 0) {
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/* CC = tweak encrypt block m-1 */
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- xts_tweak_encdec(datactx, encfunc, src, CC, T);
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+ xts_tweak_encdec(datactx, encfunc, src, CC.b, T.b);
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/* Cm = first length % XTS_BLOCK_SIZE bytes of CC */
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for (i = 0; i < mo; i++) {
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- PP[i] = src[XTS_BLOCK_SIZE + i];
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- dst[XTS_BLOCK_SIZE + i] = CC[i];
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+ PP.b[i] = src[XTS_BLOCK_SIZE + i];
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+ dst[XTS_BLOCK_SIZE + i] = CC.b[i];
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}
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for (; i < XTS_BLOCK_SIZE; i++) {
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- PP[i] = CC[i];
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+ PP.b[i] = CC.b[i];
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}
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/* Cm-1 = Tweak encrypt PP */
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- xts_tweak_encdec(datactx, encfunc, PP, dst, T);
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+ xts_tweak_encdec(datactx, encfunc, PP.b, dst, T.b);
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}
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/* Decrypt the iv back */
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- decfunc(tweakctx, XTS_BLOCK_SIZE, iv, T);
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+ decfunc(tweakctx, XTS_BLOCK_SIZE, iv, T.b);
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}
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--
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1.8.3.1
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