90fce58fce
Conflict: NA Score: CVE-2022-28327:7.5,CVE-2022-24675:7.5 Reference: https://go-review.googlesource.com/c/go/+/397136,https://go-review.googlesource.com/c/go/+/399816 Reason: fix CVE-2022-28327,CVE-2022-24675
61 lines
1.9 KiB
Diff
61 lines
1.9 KiB
Diff
From 0a42f7750216ff7ca3aa1c0fb3fcf6a1f431cca0 Mon Sep 17 00:00:00 2001
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From: Filippo Valsorda <filippo@golang.org>
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Date: Thu, 31 Mar 2022 12:31:58 -0400
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Subject: [Backport] [release-branch.go1.17] crypto/elliptic: tolerate
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zero-padded scalars in generic P-256
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Updates #52075
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Fixes #52076
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Fixes CVE-2022-28327
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Change-Id: I595a7514c9a0aa1b9c76aedfc2307e1124271f27
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Reviewed-on: https://go-review.googlesource.com/c/go/+/397136
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Trust: Filippo Valsorda <filippo@golang.org>
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Reviewed-by: Julie Qiu <julie@golang.org>
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Conflict: NA
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Reference: https://go-review.googlesource.com/c/go/+/397136
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---
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src/crypto/elliptic/elliptic_test.go | 14 ++++++++++++++
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src/crypto/elliptic/p256.go | 2 +-
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2 files changed, 15 insertions(+), 1 deletion(-)
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diff --git a/src/crypto/elliptic/elliptic_test.go b/src/crypto/elliptic/elliptic_test.go
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index bb16b0d163..498f617198 100644
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--- a/src/crypto/elliptic/elliptic_test.go
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+++ b/src/crypto/elliptic/elliptic_test.go
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@@ -802,3 +802,17 @@ func testInvalidCoordinates(t *testing.T, curve Curve) {
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checkIsOnCurveFalse("P, y", p, yy)
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}
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}
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+
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+func TestIssue52075(t *testing.T) {
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+ Gx, Gy := P256().Params().Gx, P256().Params().Gy
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+ scalar := make([]byte, 33)
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+ scalar[32] = 1
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+ x, y := P256().ScalarBaseMult(scalar)
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+ if x.Cmp(Gx) != 0 || y.Cmp(Gy) != 0 {
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+ t.Errorf("unexpected output (%v,%v)", x, y)
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+ }
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+ x, y = P256().ScalarMult(Gx, Gy, scalar)
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+ if x.Cmp(Gx) != 0 || y.Cmp(Gy) != 0 {
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+ t.Errorf("unexpected output (%v,%v)", x, y)
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+ }
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+}
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diff --git a/src/crypto/elliptic/p256.go b/src/crypto/elliptic/p256.go
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index c23e414156..787e3e7444 100644
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--- a/src/crypto/elliptic/p256.go
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+++ b/src/crypto/elliptic/p256.go
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@@ -51,7 +51,7 @@ func p256GetScalar(out *[32]byte, in []byte) {
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n := new(big.Int).SetBytes(in)
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var scalarBytes []byte
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- if n.Cmp(p256Params.N) >= 0 {
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+ if n.Cmp(p256Params.N) >= 0 || len(in) > len(out) {
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n.Mod(n, p256Params.N)
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scalarBytes = n.Bytes()
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} else {
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--
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2.30.0
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