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| author | Leonidas Da Silva Barbosa <leosilva@linux.vnet.ibm.com> | 2015-08-14 10:14:16 -0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-09-21 10:05:40 -0700 |
| commit | 176688bba97e4829627a08c852ff8bf07348bffa (patch) | |
| tree | 6b641175307534e8d889448ef9fe65172e0606c6 | |
| parent | 9feb2d70d3bc561c900e0d976d7700306f4806a4 (diff) | |
| download | lwn-176688bba97e4829627a08c852ff8bf07348bffa.tar.gz lwn-176688bba97e4829627a08c852ff8bf07348bffa.zip | |
crypto: vmx - Fixing GHASH Key issue on little endian
commit 3c5f0ed78e976be705218cad62acf6a68e9d121e upstream.
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.
Signed-off-by: Leonidas S Barbosa <leosilva@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/crypto/vmx/ghashp8-ppc.pl | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/crypto/vmx/ghashp8-ppc.pl b/drivers/crypto/vmx/ghashp8-ppc.pl index 0a6f899839dd..d8429cb71f02 100644 --- a/drivers/crypto/vmx/ghashp8-ppc.pl +++ b/drivers/crypto/vmx/ghashp8-ppc.pl @@ -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 |