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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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7
crypto/cryptd.c
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@ -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);