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crypto: ghash - Add PCLMULQDQ accelerated implementation

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PCLMULQDQ is used to accelerate the most time-consuming part of GHASH,
carry-less multiplication. More information about PCLMULQDQ can be
found at:

http://software.intel.com/en-us/articles/carry-less-multiplication-and-its-usage-for-computing-the-gcm-mode/

Because PCLMULQDQ changes XMM state, its usage must be enclosed with
kernel_fpu_begin/end, which can be used only in process context, the
acceleration is implemented as crypto_ahash. That is, request in soft
IRQ context will be defered to the cryptd kernel thread.

Signed-off-by: Huang Ying <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Huang Ying 2009-10-19 11:53:06 +09:00 • committed by Herbert Xu
commit 0e1227d356
7 changed files with 510 additions and 0 deletions
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8
crypto/Kconfig
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@ -440,6 +440,14 @@ config CRYPTO_WP512
See also:
<http://planeta.terra.com.br/informatica/paulobarreto/WhirlpoolPage.html>
config CRYPTO_GHASH_CLMUL_NI_INTEL
tristate "GHASH digest algorithm (CLMUL-NI accelerated)"
select CRYPTO_SHASH
select CRYPTO_CRYPTD
help
GHASH is message digest algorithm for GCM (Galois/Counter Mode).
The implementation is accelerated by CLMUL-NI of Intel.
comment "Ciphers"
config CRYPTO_AES