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authorGerald Schaefer <gerald.schaefer@de.ibm.com>2011-04-26 16:12:42 +1000
committerHerbert Xu <herbert@gondor.apana.org.au>2011-05-04 15:06:30 +1000
commit99d97222150a24e6096805530e141af94183b9a1 (patch)
treeefe6ac0e8fee6230b0dce3846ab0c0e93e1c5c8e /drivers/crypto
parent98971f8439b1bb9a61682fe24a865ddd25167a6b (diff)
downloadblackbird-op-linux-99d97222150a24e6096805530e141af94183b9a1.tar.gz
blackbird-op-linux-99d97222150a24e6096805530e141af94183b9a1.zip
crypto: s390 - add System z hardware support for XTS mode
This patch adds System z hardware acceleration support for the AES XTS mode. The hardware support is available beginning with System z196. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
-rw-r--r--drivers/crypto/Kconfig22
1 files changed, 8 insertions, 14 deletions
diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 7957acbf76a2..78df36adbe6c 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -131,20 +131,14 @@ config CRYPTO_AES_S390
select CRYPTO_BLKCIPHER
help
This is the s390 hardware accelerated implementation of the
- AES cipher algorithms (FIPS-197). AES uses the Rijndael
- algorithm.
-
- Rijndael appears to be consistently a very good performer in
- both hardware and software across a wide range of computing
- environments regardless of its use in feedback or non-feedback
- modes. Its key setup time is excellent, and its key agility is
- good. Rijndael's very low memory requirements make it very well
- suited for restricted-space environments, in which it also
- demonstrates excellent performance. Rijndael's operations are
- among the easiest to defend against power and timing attacks.
-
- On s390 the System z9-109 currently only supports the key size
- of 128 bit.
+ AES cipher algorithms (FIPS-197).
+
+ As of z9 the ECB and CBC modes are hardware accelerated
+ for 128 bit keys.
+ As of z10 the ECB and CBC modes are hardware accelerated
+ for all AES key sizes.
+ As of z196 the XTS mode is hardware accelerated for 256 and
+ 512 bit keys.
config S390_PRNG
tristate "Pseudo random number generator device driver"
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