From: Mamone Tarsha <maamoun.tk@googlemail.com>
Date: Fri, 2 Jul 2021 20:49:43 +0000 (+0300)
Subject: [S390x] wipe hash subkey from stack once GHASH operation completed
X-Git-Tag: nettle_3.8_release_20220602~112^2~4^2~1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7d301d935f526257a576c35e024b5a7f224a63d0;p=thirdparty%2Fnettle.git

[S390x] wipe hash subkey from stack once GHASH operation completed
---

diff --git a/s390x/msa_x4/gcm-hash.asm b/s390x/msa_x4/gcm-hash.asm
index 73a50824..3bbc8a63 100644
--- a/s390x/msa_x4/gcm-hash.asm
+++ b/s390x/msa_x4/gcm-hash.asm
@@ -92,6 +92,7 @@ PROLOGUE(_nettle_gcm_hash)
     brc            1,3b                          C safely branch back in case of partial completion
 4:
     mvc            0(16,%r6),0(%r1)              C store x
+    xc             16(16,%r1),16(%r1)            C wipe hash subkey from stack
     FREE_STACK(PB_SIZE+16)
     lgdr           %r6,%f0                       C restore general register 6
     br             RA