diff options
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 7957acbf76a..78df36adbe6 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" |