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| author | Huang Ying <ying.huang@intel.com> | 2009-10-19 11:53:06 +0900 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2009-10-19 11:53:06 +0900 |
| commit | 25b6abffbe95fdc4cab3278fb69a473e17f0e4b8 (patch) | |
| tree | 390de5f863e6576eaba566dbbfc0c9411fdd57e9 | |
| parent | b2a6de237d081577c556da17412fa36899bbc03f (diff) | |
| download | linux-crypto-25b6abffbe95fdc4cab3278fb69a473e17f0e4b8.tar.gz linux-crypto-25b6abffbe95fdc4cab3278fb69a473e17f0e4b8.zip | |
crypto: ghash - Add PCLMULQDQ accelerated implementation
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 <ying.huang@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
| -rw-r--r-- | crypto/Kconfig | 8 | ||||
| -rw-r--r-- | crypto/cryptd.c | 7 |
2 files changed, 15 insertions, 0 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig index 26b5dd0c..fd687110 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -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 diff --git a/crypto/cryptd.c b/crypto/cryptd.c index 35335825..f8ae0d94 100644 --- a/crypto/cryptd.c +++ b/crypto/cryptd.c @@ -711,6 +711,13 @@ struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm) } EXPORT_SYMBOL_GPL(cryptd_ahash_child); +struct shash_desc *cryptd_shash_desc(struct ahash_request *req) +{ + struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); + return &rctx->desc; +} +EXPORT_SYMBOL_GPL(cryptd_shash_desc); + void cryptd_free_ahash(struct cryptd_ahash *tfm) { crypto_free_ahash(&tfm->base); |