In previous blogs, the old math library implementations were discussed and wolfSSL‘s new SP Math All implementation was introduced. Also a comparison between the Integer and SP Math All implementations was discussed showing the improvements in the new library that make it a compelling replacement.
Let’s take a look at how much faster SP Math All is than TFM. (Note: SP Math All configured with –-enable-sp-math-all=huge, TFM configured with --enable-fasthugemath.)
| x64 | Aarch64 | |
|---|---|---|
| RSA 2048 Sign | 32.05% | 44.69% |
| RSA 2048 Verify | 21.30% | 31.01% |
| DH 2048 Key Gen | 10.90% | 16.31% |
| DH 2048 Agree | 6.56% | 16.27% |
| ECC P-256 Key Gen | 57.92% | 56.95% |
| ECC P-256 Agree | 54.38% | 55.90% |
| ECC P-256 Sign | 53.95% | 49.95% |
| ECC P-256 Verify | 41.35% | 47.73% |
The Elliptic Curve algorithms are consistently faster across the board – about 50% on x64 and Aarch64. The RSA and DH are variable but the RSA sign is significantly faster. This is all due to better multiplication and squaring operations that use better assembly code snippets.
Now for the code size:
| x64 (bytes) | TFM | SP Math All | |
|---|---|---|---|
| +RSA +DH +ECC | 490866 | 136842 | -72.12% |
| +RSA +DH -ECC | 485785 | 126410 | -73.98% |
| -RSA -DH +ECC | 485210 | 136266 | -71.92% |
The TFM huge build includes Comba implementations of large bit sizes while the SP Math All uses significantly smaller Karatsuba implementations resulting in vast savings in size with increased speed.
Clearly SP Math All has all the features of TFM but does it better!
In the next blog, a comparison of the performance characteristics of SP Math All and OpenSSL.
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