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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
AES key, while swapping only a single dword in a loop, resulting in swapped
key and partially swapped expanded keys, breaking AES encryption and
decryption on VIA Padlock hardware.

This commit correctly sets the number of swapping loops to be done.

Fixes #20073

CLA: trivial

Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20077)
This commit is contained in:
ValdikSS 2023-01-18 20:14:48 +03:00 committed by Hugo Landau
parent 69d6ecb7c3
commit 7331e7ef79
2 changed files with 4 additions and 0 deletions
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2
engines/asm/e_padlock-x86.pl
View File

@ -115,6 +115,8 @@ $chunk="ebx";
&function_begin_B("padlock_key_bswap");
&mov ("edx",&wparam(0));
&mov ("ecx",&DWP(240,"edx"));
&inc ("ecx");
&shl ("ecx",2);
&set_label("bswap_loop");
&mov ("eax",&DWP(0,"edx"));
&bswap ("eax");

2
engines/asm/e_padlock-x86_64.pl
View File

@ -94,6 +94,8 @@ padlock_capability:
.align 16
padlock_key_bswap:
mov 240($arg1),%edx
inc %edx
shl \$2,%edx
.Lbswap_loop:
mov ($arg1),%eax
bswap %eax