mulVec is not exposed

[jochem-brouwer]

At EthereumJS-VM we are using this library in order to get the BLS12-381 EIP in our library.

This EIP also needs access to multi scalar multiplication, i.e. the mclBnG1_mulVec and mclBnG2_mulVec functions from mcl. They do not seem to be (directly (?)) exposed. Can this function be exposed?

[herumi]

Yes, I can expose those functions. There are many functions to be exported for BLS12-381. But is it better to expose them from bls-eth-wasm?
What features do you need?

[jochem-brouwer]

See EIP 2537. Thanks a lot so far =)

I thus need:

• G1/G2 addition (this is available)
• G1/G2 multiplication (this is also available)
• G1/G2 multiexponentation (this is not readily available, but I think this can be implemented indirectly by using addition/multiplication)
• G1/G2 pairing (this looks like it is available, yet I did not test this)
• Map Fp to G1/G2 (this looks available, although the G1 implementation might not yield the expected results; see this mcl issue)

[herumi]

I see. To expose mclBnG1_mulVec is an easy task. I'm studying the spec of the map-to-g1 function.

[herumi]

I've exported mclBnG1_mulVec and mclBnG2_mulVec.
774d276

[jochem-brouwer]

Thanks a lot @herumi, this works like a charm! 😄