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author | Nicolas Boichat <drinkcat@chromium.org> | 2017-09-06 18:04:19 +0800 |
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committer | chrome-bot <chrome-bot@chromium.org> | 2017-09-11 04:42:59 -0700 |
commit | 797d740727813c7b600e8ecd9df0bb87b0d39678 (patch) | |
tree | a4c71e038186ad4f84054dfda567a2e0dcf79e79 /common/sha256.c | |
parent | 1d4c4530ac5bf2d2e4acb8950fba5dd8c5a12033 (diff) | |
download | chrome-ec-797d740727813c7b600e8ecd9df0bb87b0d39678.tar.gz |
common/sha256: agressive SHA-256 unrolling as an option
Reduces "hash done" time from ~1.30 to ~1.15s on soraka.
BRANCH=none
BUG=chromium:702378
BUG=b:64196191
TEST=Boot soraka, looks at hash done time.
TEST=make run-sha256 run-sha256_unrolled passes.
Change-Id: Ia29ee27404d6e9aa615ff59755b59d3f26648e71
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/652327
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Diffstat (limited to 'common/sha256.c')
-rw-r--r-- | common/sha256.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/common/sha256.c b/common/sha256.c index 06478708b0..2d6eaa43f2 100644 --- a/common/sha256.c +++ b/common/sha256.c @@ -131,12 +131,37 @@ static void SHA256_transform(struct sha256_ctx *ctx, const uint8_t *message, for (j = 0; j < 16; j++) PACK32(&sub_block[j << 2], &w[j]); +#ifdef CONFIG_SHA256_UNROLLED + for (j = 16; j < 64; j += 8) { + SHA256_SCR(j); + SHA256_SCR(j+1); + SHA256_SCR(j+2); + SHA256_SCR(j+3); + SHA256_SCR(j+4); + SHA256_SCR(j+5); + SHA256_SCR(j+6); + SHA256_SCR(j+7); + } +#else for (j = 16; j < 64; j++) SHA256_SCR(j); +#endif for (j = 0; j < 8; j++) wv[j] = ctx->h[j]; +#ifdef CONFIG_SHA256_UNROLLED + for (j = 0; j < 64; j += 8) { + SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, j); + SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, j+1); + SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, j+2); + SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, j+3); + SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, j+4); + SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, j+5); + SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, j+6); + SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, j+7); + } +#else for (j = 0; j < 64; j++) { t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6]) + sha256_k[j] + w[j]; @@ -150,6 +175,7 @@ static void SHA256_transform(struct sha256_ctx *ctx, const uint8_t *message, wv[1] = wv[0]; wv[0] = t1 + t2; } +#endif for (j = 0; j < 8; j++) ctx->h[j] += wv[j]; |