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crypto: vmx - Fixing AES-CTR counter bug

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AES-CTR is using a counter 8bytes-8bytes what miss match with
kernel specs.

In the previous code a vadduwm was done to increment counter.
Replacing this for a vadduqm now considering both cases counter
8-8 bytes and full 16bytes.

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>
This commit is contained in:
Leonidas Da Silva Barbosa 2015-08-14 10:12:22 -03:00 committed by Herbert Xu
parent dd43c4e92f
commit 1d4aa0b4c1
2 changed files with 24 additions and 18 deletions
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6
drivers/crypto/vmx/aes_ctr.c
View File

@ -115,6 +115,7 @@ static int p8_aes_ctr_crypt(struct blkcipher_desc *desc,
struct scatterlist *src, unsigned int nbytes)
{
int ret;
u64 inc;
struct blkcipher_walk walk;
struct p8_aes_ctr_ctx *ctx =
crypto_tfm_ctx(crypto_blkcipher_tfm(desc->tfm));
@ -143,7 +144,12 @@ static int p8_aes_ctr_crypt(struct blkcipher_desc *desc,
walk.iv);
pagefault_enable();
/* We need to update IV mostly for last bytes/round */
inc = (nbytes & AES_BLOCK_MASK) / AES_BLOCK_SIZE;
if (inc > 0)
while (inc--)
crypto_inc(walk.iv, AES_BLOCK_SIZE);
nbytes &= AES_BLOCK_SIZE - 1;
ret = blkcipher_walk_done(desc, &walk, nbytes);
}

34
drivers/crypto/vmx/aesp8-ppc.pl
View File

@ -1437,28 +1437,28 @@ Load_ctr32_enc_key:
?vperm v31,v31,$out0,$keyperm
lvx v25,$x10,$key_ # pre-load round[2]
vadduwm $two,$one,$one
vadduqm $two,$one,$one
subi $inp,$inp,15 # undo "caller"
$SHL $len,$len,4
vadduwm $out1,$ivec,$one # counter values ...
vadduwm $out2,$ivec,$two
vadduqm $out1,$ivec,$one # counter values ...
vadduqm $out2,$ivec,$two
vxor $out0,$ivec,$rndkey0 # ... xored with rndkey[0]
le?li $idx,8
vadduwm $out3,$out1,$two
vadduqm $out3,$out1,$two
vxor $out1,$out1,$rndkey0
le?lvsl $inpperm,0,$idx
vadduwm $out4,$out2,$two
vadduqm $out4,$out2,$two
vxor $out2,$out2,$rndkey0
le?vspltisb $tmp,0x0f
vadduwm $out5,$out3,$two
vadduqm $out5,$out3,$two
vxor $out3,$out3,$rndkey0
le?vxor $inpperm,$inpperm,$tmp # transform for lvx_u/stvx_u
vadduwm $out6,$out4,$two
vadduqm $out6,$out4,$two
vxor $out4,$out4,$rndkey0
vadduwm $out7,$out5,$two
vadduqm $out7,$out5,$two
vxor $out5,$out5,$rndkey0
vadduwm $ivec,$out6,$two # next counter value
vadduqm $ivec,$out6,$two # next counter value
vxor $out6,$out6,$rndkey0
vxor $out7,$out7,$rndkey0
@ -1594,27 +1594,27 @@ Loop_ctr32_enc8x_middle:
vcipherlast $in0,$out0,$in0
vcipherlast $in1,$out1,$in1
vadduwm $out1,$ivec,$one # counter values ...
vadduqm $out1,$ivec,$one # counter values ...
vcipherlast $in2,$out2,$in2
vadduwm $out2,$ivec,$two
vadduqm $out2,$ivec,$two
vxor $out0,$ivec,$rndkey0 # ... xored with rndkey[0]
vcipherlast $in3,$out3,$in3
vadduwm $out3,$out1,$two
vadduqm $out3,$out1,$two
vxor $out1,$out1,$rndkey0
vcipherlast $in4,$out4,$in4
vadduwm $out4,$out2,$two
vadduqm $out4,$out2,$two
vxor $out2,$out2,$rndkey0
vcipherlast $in5,$out5,$in5
vadduwm $out5,$out3,$two
vadduqm $out5,$out3,$two
vxor $out3,$out3,$rndkey0
vcipherlast $in6,$out6,$in6
vadduwm $out6,$out4,$two
vadduqm $out6,$out4,$two
vxor $out4,$out4,$rndkey0
vcipherlast $in7,$out7,$in7
vadduwm $out7,$out5,$two
vadduqm $out7,$out5,$two
vxor $out5,$out5,$rndkey0
le?vperm $in0,$in0,$in0,$inpperm
vadduwm $ivec,$out6,$two # next counter value
vadduqm $ivec,$out6,$two # next counter value
vxor $out6,$out6,$rndkey0
le?vperm $in1,$in1,$in1,$inpperm
vxor $out7,$out7,$rndkey0