44 lines
1.3 KiB
Diff
44 lines
1.3 KiB
Diff
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From 971bed6ab4b27014eb23085e8176917e1a096fd5 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Niels=20M=C3=B6ller?= <nisse@lysator.liu.se>
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Date: Sat, 13 Mar 2021 17:26:37 +0100
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Subject: [PATCH] Use ecc_mod_mul_canonical for point comparison.
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* eddsa-verify.c (equal_h): Use ecc_mod_mul_canonical.
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(cherry picked from commit 5b7608fde3a6d2ab82bffb35db1e4e330927c906)
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---
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ChangeLog | 4 ++++
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eddsa-verify.c | 9 ++-------
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2 files changed, 6 insertions(+), 7 deletions(-)
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#diff --git a/ChangeLog b/ChangeLog
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#index 5cc5c188..2a9217a6 100644
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#--- a/ChangeLog
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#+++ b/ChangeLog
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#@@ -1,3 +1,7 @@
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#+2021-03-13 Niels Möller <nisse@lysator.liu.se>
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#+
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#+ * eddsa-verify.c (equal_h): Use ecc_mod_mul_canonical.
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#+
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# 2021-03-11 Niels Möller <nisse@lysator.liu.se>
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#
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# * ecc-mod-arith.c (ecc_mod_mul_canonical, ecc_mod_sqr_canonical):
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--- a/eddsa-verify.c
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+++ b/eddsa-verify.c
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@@ -53,13 +53,8 @@ equal_h (const struct ecc_modulo *p,
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#define t0 scratch
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#define t1 (scratch + p->size)
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- ecc_mod_mul (p, t0, x1, z2);
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- if (mpn_cmp (t0, p->m, p->size) >= 0)
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- mpn_sub_n (t0, t0, p->m, p->size);
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-
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- ecc_mod_mul (p, t1, x2, z1);
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- if (mpn_cmp (t1, p->m, p->size) >= 0)
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- mpn_sub_n (t1, t1, p->m, p->size);
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+ ecc_mod_mul_canonical (p, t0, x1, z2, t0);
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+ ecc_mod_mul_canonical (p, t1, x2, z1, t1);
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return mpn_cmp (t0, t1, p->size) == 0;
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