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53 lines
1.6 KiB
Diff
53 lines
1.6 KiB
Diff
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From 2bcf8e69bd92e33d84c48e7d108d3d46b22f8a6d Mon Sep 17 00:00:00 2001
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From: ValdikSS <iam@valdikss.org.ru>
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Date: Wed, 18 Jan 2023 20:14:48 +0300
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Subject: [PATCH] Padlock: fix byte swapping assembly for AES-192 and 256
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Byte swapping code incorrectly uses the number of AES rounds to swap expanded
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AES key, while swapping only a single dword in a loop, resulting in swapped
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key and partially swapped expanded keys, breaking AES encryption and
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decryption on VIA Padlock hardware.
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This commit correctly sets the number of swapping loops to be done.
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Fixes #20073
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CLA: trivial
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Reviewed-by: Hugo Landau <hlandau@openssl.org>
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Reviewed-by: Tomas Mraz <tomas@openssl.org>
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(Merged from https://github.com/openssl/openssl/pull/20077)
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(cherry picked from commit 7331e7ef79fe4499d81cc92249e9c97e9ff9291a)
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---
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engines/asm/e_padlock-x86.pl | 2 ++
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engines/asm/e_padlock-x86_64.pl | 2 ++
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2 files changed, 4 insertions(+)
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diff --git a/engines/asm/e_padlock-x86.pl b/engines/asm/e_padlock-x86.pl
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index 5b097ce3ef9b..07f7000fd38a 100644
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--- a/engines/asm/e_padlock-x86.pl
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+++ b/engines/asm/e_padlock-x86.pl
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@@ -116,6 +116,8 @@
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&function_begin_B("padlock_key_bswap");
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&mov ("edx",&wparam(0));
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&mov ("ecx",&DWP(240,"edx"));
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+ &inc ("ecx");
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+ &shl ("ecx",2);
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&set_label("bswap_loop");
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&mov ("eax",&DWP(0,"edx"));
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&bswap ("eax");
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diff --git a/engines/asm/e_padlock-x86_64.pl b/engines/asm/e_padlock-x86_64.pl
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index 09b0aaa48dfe..dfd2ae656375 100644
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--- a/engines/asm/e_padlock-x86_64.pl
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+++ b/engines/asm/e_padlock-x86_64.pl
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@@ -92,6 +92,8 @@
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.align 16
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padlock_key_bswap:
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mov 240($arg1),%edx
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+ inc %edx
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+ shl \$2,%edx
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.Lbswap_loop:
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mov ($arg1),%eax
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bswap %eax
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