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authorLeonidas Da Silva Barbosa <leosilva@linux.vnet.ibm.com>2015-08-14 10:14:16 -0300
committerHerbert Xu <herbert@gondor.apana.org.au>2015-08-18 10:30:36 +0800
commit3c5f0ed78e976be705218cad62acf6a68e9d121e (patch)
treec6095373c863c1da23a2b316bbb8bfa7daf3b02a /drivers/crypto
parent1d4aa0b4c1816e8ca92a6aadb0d8f6b43c56c0d0 (diff)
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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: Leonidas S Barbosa <leosilva@linux.vnet.ibm.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
-rw-r--r--drivers/crypto/vmx/ghashp8-ppc.pl6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/crypto/vmx/ghashp8-ppc.pl b/drivers/crypto/vmx/ghashp8-ppc.pl
index 0a6f899..d8429cb 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
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