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>
diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 7957acb..78df36a 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -131,20 +131,14 @@
select CRYPTO_BLKCIPHER
help
This is the s390 hardware accelerated implementation of the
- AES cipher algorithms (FIPS-197). AES uses the Rijndael
- algorithm.
+ AES cipher algorithms (FIPS-197).
- 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.
+ 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"