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crypto: vmx - Fixing GHASH Key issue on little endian

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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: [email protected]
Signed-off-by: Leonidas S Barbosa <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Leonidas Da Silva Barbosa 2015-08-14 10:14:16 -03:00 • committed by Herbert Xu
commit 3c5f0ed78e
1 changed files with 6 additions and 0 deletions
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6
drivers/crypto/vmx/ghashp8-ppc.pl
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@ -61,6 +61,12 @@ $code=<<___;
mtspr 256,r0
li r10,0x30
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 $t0,1 # one