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| H A D | sub.mk | 9ff4f2ccc026c73fd8a953aeb76ac48cea961d25 Fri Aug 05 14:55:54 UTC 2016 Jerome Forissier <jerome.forissier@linaro.org> arm32: AES using ARMv8-A cryptographic extensions
Add AES acceleration to LibTomCrypt in 32-bit mode using ARMv8
Cryptographic Extensions. Enabled when CFG_CRYPTO_AES_ARM32_CE=y.
The ARMv8 CE assembler code comes from the Linux kernel's
arch/arm64/crypto/aes-ce-core.S (contributed by Ard Biesheuvel,
Linaro) with minor updates:
- Removed the alignment hints in vld1/vst1 operations, for instance
'vld1.8 {q1}, [r1, :64]!' becomes 'vld1.8 {q1}, [r1]!'. This is
required because the input and output buffers may not be 8-byte
aligned.
- ce_aes_ctr_encrypt(): do not increment the counter on the first block
because the C wrapper already did. Do not increment the counter after
the last block has been processed either, because the C wrapper will do
it before calling ce_aes_ctr_encrypt() again.
- aes_xts_decrypt(): drop the 'first' parameter which is not used (it
would always be set to 1 by the caller).
Tested on HiKey with xtest [1] for functional tests and aes-perf [2] for
speed. In the table below, a mode name followed by a '+' means
accelerated with crypto extensions, while no '+' is with acceleration
disabled (i.e., CFG_CRYPTO_AES_ARM32_CE=n).
Average encryption speed (MiB/s):
Size | Mode
(KiB) | ECB CBC CTR XTS ECB+ CBC+ CTR+ XTS+
------+--------------------------------------------------
1 | 14.9 12.7 12.3 10.9 33.8 32.7 33.3 29.1
2 | 18.2 15.4 14.9 13.3 65.0 60.9 62.6 55.4
4 | 20.8 17.3 16.6 15.0 119.3 106.0 112.6 101.0
8 | 22.4 18.2 17.6 16.0 201.6 166.5 182.3 166.7
16 | 23.3 19.0 18.1 16.6 308.1 232.9 264.3 248.3
32 | 23.8 19.3 18.4 16.9 427.7 295.1 346.4 335.1
64 | 24.0 19.5 18.6 17.1 532.8 341.3 411.0 407.6
128 | 24.2 19.6 18.7 17.2 608.1 371.3 454.9 457.5
256 | 24.2 19.6 18.7 17.1 624.4 382.0 463.5 481.6
512 | 24.0 19.4 18.6 17.1 658.8 389.6 477.3 498.3
[1] https://github.com/OP-TEE/optee_test
[2] https://github.com/linaro-swg/aes-perf.git
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: David Brown <david.brown@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
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