This is an AES-CTR wrapper around SPARC T4 AES instructions (Oracle SPARC Architecture 2011, section 7.3-7.4).
The code is written to be compatible with the eSTREAM testing framework, just drop it into the submissions directory and run the benchmarks to try it out.
Of course, the usual disclaimer applies: This is experimental and unaudited code, use it at your own risk.
Below is the comparison between my implementation and the benchmark implementation included in the testing framework:
| Implementation | Long Stream | 40 bytes | 576 bytes | 1500 bytes | Imix | Agility | Key setup | IV setup |
|---|---|---|---|---|---|---|---|---|
| bernstein/big-1/1 | 29.80 cpb | 42.90 cpb | 30.22 cpb | 30.05 cpb | 31.03 cpb | 34.52 cpb | 269.11 cycles | 76.86 cycles |
| aes-sparct4 | 4.09 cpb | 8.84 cpb | 4.36 cpb | 4.23 cpb | 4.62 cpb | 7.48 cpb | 159.40 cycles | 73.32 cycles |
All tests were done on a 2.85 GHz SPARC T4 running Gentoo Linux with Clang 12.0.0 compiler.
- Optimize it more.
- OpenSSL managed to run 128-bit AES-CTR at about 2.65 cpb using a custom assembly loop.
- Add 192 and 256 bit key variants.