Initialize for libnettle

libnettle-Workaround-for-qemu-bug-affecting-the-ppc-intruction.patch

@@ -0,0 +1,46 @@
+From d618864183ccfdcd0d1b5443111fbaf9a5934517 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Niels=20M=C3=B6ller?= <nisse@lysator.liu.se>
+Date: Sun, 14 Aug 2022 20:53:10 +0200
+Subject: [PATCH 0960/1000] Workaround for qemu bug affecting the ppc
+ intruction vmsumudm
+
+Introduce overriding environment variable NETTLE_FAT_DISABLE_POWER9
+that disables use of power9 code. This makes poly1305 tests under qemu
+pass. See https://gitlab.com/qemu-project/qemu/-/issues/1156.
+---
+ .gitlab-ci.yml | 4 ++--
+ fat-ppc.c      | 5 +++++
+ fat-setup.h    | 1 +
+ 3 files changed, 8 insertions(+), 2 deletions(-)
+
+diff --git a/fat-ppc.c b/fat-ppc.c
+index 7569e44d..b0412e5a 100644
+--- a/fat-ppc.c
++++ b/fat-ppc.c
+@@ -153,6 +153,11 @@ get_ppc_features (struct ppc_features *features)
+ 	   == (PPC_FEATURE_HAS_ALTIVEC | PPC_FEATURE_HAS_VSX));
+ #endif
+     }
++  /* NETTLE_FAT_DISABLE_POWER9 can be set to disable code that fails
++     in qemu, due to
++     https://gitlab.com/qemu-project/qemu/-/issues/1156. */
++  if (secure_getenv (ENV_DISABLE_POWER9))
++    features->have_power9 = 0;
+ }
+ 
+ DECLARE_FAT_FUNC(_nettle_aes_encrypt, aes_crypt_internal_func)
+diff --git a/fat-setup.h b/fat-setup.h
+index ad3c10f0..a35b8b8c 100644
+--- a/fat-setup.h
++++ b/fat-setup.h
+@@ -92,6 +92,7 @@
+ 
+ #define ENV_VERBOSE "NETTLE_FAT_VERBOSE"
+ #define ENV_OVERRIDE "NETTLE_FAT_OVERRIDE"
++#define ENV_DISABLE_POWER9 "NETTLE_FAT_DISABLE_POWER9"
+ 
+ struct chacha_ctx;
+ struct salsa20_ctx;
+-- 
+2.38.0
+