And EC.b can be used here:
Thank you for Pointing where b is used, I recheck the code and that function is not there, anyway it is easy to add.
Do you know whether it's making use of SSE? But even more important than that, maybe there's a series of assembly instructions you can run to run repeated calls faster.
The SSE are used in some other code of JLP those are used to generate 4 sha256 hashes of fixed data at the same time.
That is only useful when you are working with addresses or hashes rmd160 those SSE functions boost that part of the code some 2 or 3 times faster.
Also I use those in keyhunt for address and rmd160 search.
About if that code can be optimized, I already check it a lot of times and it is already optimized.
Regards