BLS signatures with point compression

Question

BLS signatures with point compression

xATI-researcher opened this issue a year ago · 2 comments

Hello. I have tested BLS signatures with the curve B12-P381 for research purposes and I have noticed that the output signature size is 96 bytes having the signature in the G1 group. Is there a way to use the point compression option in order to reduce the size of the resulted signature?

Answer 1 · 2023-09-07T11:50:35.000Z

Hi,

It's not visible in the API for BLS signatures, but you can request a compressed G1 element when serializing it to a byte buffer using the function g1_write_bin. There is a specific flag there for compression.

Hope it helps!

Answer 2 · 2023-09-07T19:15:11.000Z

Hello. It works using g1_write_bin and g1_read_bin for compressing and deserializing a G1 element. Thank you very much for the fast answer.