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

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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 <[email protected]>
Signed-off-by: Gerald Schaefer <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Gerald Schaefer 2011-04-26 16:12:42 +10:00 • committed by Herbert Xu
commit 99d9722215
3 changed files with 272 additions and 14 deletions
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20
drivers/crypto/Kconfig
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@ -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.
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"