diff options
| author | Gerald Schaefer <gerald.schaefer@de.ibm.com> | 2011-04-26 16:12:42 +1000 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2011-05-04 15:06:30 +1000 |
| commit | 99d97222150a24e6096805530e141af94183b9a1 (patch) | |
| tree | efe6ac0e8fee6230b0dce3846ab0c0e93e1c5c8e /drivers/crypto | |
| parent | 98971f8439b1bb9a61682fe24a865ddd25167a6b (diff) | |
| download | linux-99d97222150a24e6096805530e141af94183b9a1.tar.bz2 | |
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/Kconfig | 22 |
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" |