1 files changed, 48 insertions, 0 deletions
diff --git a/meta/recipes-support/nettle/nettle-3.5.1/CVE-2021-20305-4.patch b/meta/recipes-support/nettle/nettle-3.5.1/CVE-2021-20305-4.patch
new file mode 100644
index 0000000000..54b4fa584c
--- /dev/null
+++ b/meta/recipes-support/nettle/nettle-3.5.1/CVE-2021-20305-4.patch
@@ -0,0 +1,48 @@
+Backport of:
+
+From 51f643eee00e2caa65c8a2f5857f49acdf3ef1ce Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Niels=20M=C3=B6ller?= <nisse@lysator.liu.se>
+Date: Sat, 13 Mar 2021 16:27:50 +0100
+Subject: [PATCH] Ensure ecdsa_sign output is canonically reduced.
+
+* ecc-ecdsa-sign.c (ecc_ecdsa_sign): Ensure s output is reduced to
+canonical range.
+
+(cherry picked from commit c24b36160dc5303f7541dd9da1429c4046f27398)
+
+Upstream-Status: Backport
+https://sources.debian.org/data/main/n/nettle/3.4.1-1%2Bdeb10u1/debian/patches/CVE-2021-20305-4.patch
+CVE: CVE-2021-20305 dep4
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ ChangeLog        | 3 +++
+ ecc-ecdsa-sign.c | 3 +--
+ 2 files changed, 4 insertions(+), 2 deletions(-)
+
+#diff --git a/ChangeLog b/ChangeLog
+#index 63848f53..fb2d7f66 100644
+#--- a/ChangeLog
+#+++ b/ChangeLog
+#@@ -1,5 +1,8 @@
+# 2021-03-13  Niels MÃ¶ller  <nisse@lysator.liu.se>
+# 
+#+	* ecc-ecdsa-sign.c (ecc_ecdsa_sign): Ensure s output is reduced to
+#+	canonical range.
+#+
+# 	* ecc-ecdsa-verify.c (ecc_ecdsa_verify): Use ecc_mod_mul_canonical
+# 	to compute the scalars used for ecc multiplication.
+# 	* testsuite/ecdsa-verify-test.c (test_main): Add test case that
+--- a/ecc-ecdsa-sign.c
++++ b/ecc-ecdsa-sign.c
+@@ -90,9 +90,8 @@ ecc_ecdsa_sign (const struct ecc_curve *
+ 
+   ecc_modq_mul (ecc, tp, zp, rp);
+   ecc_modq_add (ecc, hp, hp, tp);
+-  ecc_modq_mul (ecc, tp, hp, kinv);
++  ecc_mod_mul_canonical (&ecc->q, sp, hp, kinv, tp);
+ 
+-  mpn_copyi (sp, tp, ecc->p.size);
+ #undef P
+ #undef hp
+ #undef kinv