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3 Commits

Author SHA1 Message Date
Ard Biesheuvel
b913a6404c arm64/crypto: improve performance of GHASH algorithm 
This patches modifies the GHASH secure hash implementation to switch to a
faster, polynomial multiplication based reduction instead of one that uses
shifts and rotates.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
 2014-06-18 12:40:54 +01:00
Ard Biesheuvel
6aa8b209f5 arm64/crypto: fix data corruption bug in GHASH algorithm 
This fixes a bug in the GHASH algorithm resulting in the calculated hash to be
incorrect if the input is presented in chunks whose size is not a multiple of
16 bytes.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Fixes: fdd2389457 ("arm64/crypto: GHASH secure hash using ARMv8 Crypto Extensions")
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
 2014-06-18 12:40:53 +01:00
Ard Biesheuvel
fdd2389457 arm64/crypto: GHASH secure hash using ARMv8 Crypto Extensions 
This is a port to ARMv8 (Crypto Extensions) of the Intel implementation of the
GHASH Secure Hash (used in the Galois/Counter chaining mode). It relies on the
optional PMULL/PMULL2 instruction (polynomial multiply long, what Intel call
carry-less multiply).

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
 2014-05-14 10:04:07 -07:00