From 949557945cf806dfbc646c8919a398ae637f7c25 Mon Sep 17 00:00:00 2001 Message-ID: <949557945cf806dfbc646c8919a398ae637f7c25.1770174288.git.sam@gentoo.org> In-Reply-To: <927850875c6254282697dbbed8aff65275bdeff5.1770174288.git.sam@gentoo.org> References: <927850875c6254282697dbbed8aff65275bdeff5.1770174288.git.sam@gentoo.org> From: NIIBE Yutaka Date: Tue, 3 Feb 2026 15:10:41 +0900 Subject: [PATCH 2/2] mpi:ec: Don't modify POINT in _gcry_mpi_ec_get_affine. * mpi/ec.c (_gcry_mpi_ec_get_affine): Don't modify POINT. -- GnuPG-bug-id: 8080 Signed-off-by: NIIBE Yutaka --- mpi/ec.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/mpi/ec.c b/mpi/ec.c index d7bad4a6..b0b6f427 100644 --- a/mpi/ec.c +++ b/mpi/ec.c @@ -1220,18 +1220,20 @@ _gcry_mpi_ec_get_affine (gcry_mpi_t x, gcry_mpi_t y, mpi_point_t point, if (x) { - mpi_resize (point->x, ctx->p->nlimbs); - point->x->nlimbs = ctx->p->nlimbs; - ec_mulm_lli (x, point->x, z2, ctx); + mpi_set (x, point->x); + mpi_resize (x, ctx->p->nlimbs); + x->nlimbs = ctx->p->nlimbs; + ec_mulm_lli (x, x, z2, ctx); } if (y) { - mpi_resize (point->y, ctx->p->nlimbs); - point->y->nlimbs = ctx->p->nlimbs; + mpi_set (y, point->y); + mpi_resize (y, ctx->p->nlimbs); + y->nlimbs = ctx->p->nlimbs; z3 = mpi_new (0); ec_mulm_lli (z3, z2, z1, ctx); /* z3 = z^(-3) mod p */ - ec_mulm_lli (y, point->y, z3, ctx); + ec_mulm_lli (y, y, z3, ctx); mpi_free (z3); } -- 2.53.0