41 lines
1.1 KiB
Diff
41 lines
1.1 KiB
Diff
From 5ba63ec41a6e734c9ff82e20e4f84ac94c59ae27 Mon Sep 17 00:00:00 2001
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From: NIIBE Yutaka <gniibe@fsij.org>
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Date: Fri, 10 Apr 2026 16:58:57 +0900
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Subject: [PATCH] cipher:ecc: Fix decoding a point on Montgomery curve.
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* cipher/ecc-misc.c (_gcry_ecc_mont_decodepoint): Fix the padding
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mistake and add updating RAWMPILEN.
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--
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Reported by Calif.io in collaboration with Claude and Anthropic
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Research.
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GnuPG-bug-id: 8211
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Fixes-commit: bbe15758c893dbf546416c1a6bccdad1ab000ad7
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Suggested-by: Bronson Yen <bronson@calif.io>
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Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
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---
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cipher/ecc-misc.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/cipher/ecc-misc.c b/cipher/ecc-misc.c
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index 0c387c27..be4e2862 100644
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--- a/cipher/ecc-misc.c
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+++ b/cipher/ecc-misc.c
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@@ -324,7 +324,10 @@ _gcry_ecc_mont_decodepoint (gcry_mpi_t pk, mpi_ec_t ctx, mpi_point_t result)
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*--p = *buf++;
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if (rawmpilen < nbytes)
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- memset (rawmpi + nbytes - rawmpilen, 0, nbytes - rawmpilen);
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+ {
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+ memset (rawmpi + rawmpilen, 0, nbytes - rawmpilen);
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+ rawmpilen = nbytes;
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+ }
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}
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else
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{
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--
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2.54.0
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