Commit 3c5f0ed7 authored by Leonidas Da Silva Barbosa's avatar Leonidas Da Silva Barbosa Committed by Herbert Xu

crypto: vmx - Fixing GHASH Key issue on little endian

GHASH table algorithm is using a big endian key.
In little endian machines key will be LE ordered.
After a lxvd2x instruction key is loaded as it is,
LE/BE order, in first case it'll generate a wrong
table resulting in wrong hashes from the algorithm.

Bug affects only LE machines.
In order to fix it we do a swap for loaded key.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarLeonidas S Barbosa <leosilva@linux.vnet.ibm.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 1d4aa0b4
...@@ -61,6 +61,12 @@ $code=<<___; ...@@ -61,6 +61,12 @@ $code=<<___;
mtspr 256,r0 mtspr 256,r0
li r10,0x30 li r10,0x30
lvx_u $H,0,r4 # load H lvx_u $H,0,r4 # load H
le?xor r7,r7,r7
le?addi r7,r7,0x8 # need a vperm start with 08
le?lvsr 5,0,r7
le?vspltisb 6,0x0f
le?vxor 5,5,6 # set a b-endian mask
le?vperm $H,$H,$H,5
vspltisb $xC2,-16 # 0xf0 vspltisb $xC2,-16 # 0xf0
vspltisb $t0,1 # one vspltisb $t0,1 # one
......
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