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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