crypto: s390 - add System z hardware support for CTR mode

This patch adds System z hardware acceleration support for AES, DES
and 3DES in CTR mode. The hardware support is available starting with
System z196.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index dc601ff4bcfd..c64c3807f516 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -119,9 +119,12 @@ config CRYPTO_DES_S390
         select CRYPTO_ALGAPI
         select CRYPTO_BLKCIPHER
         help
-          This us the s390 hardware accelerated implementation of the
+          This is the s390 hardware accelerated implementation of the
           DES cipher algorithm (FIPS 46-2), and Triple DES EDE (FIPS 46-3).
 
+          As of z990 the ECB and CBC mode are hardware accelerated.
+          As of z196 the CTR mode is hardware accelerated.
+
 config CRYPTO_AES_S390
         tristate "AES cipher algorithms"
         depends on S390
@@ -135,7 +138,8 @@ config CRYPTO_AES_S390
           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
+          As of z196 the CTR mode is hardware accelerated for all AES
+          key sizes and XTS mode is hardware accelerated for 256 and
           512 bit keys.
 
 config S390_PRNG