mirror of
https://github.com/bitcoin/bitcoin.git
synced 2026-03-20 12:39:47 +01:00
4f9791abba
* Make secp256k1_gej_add_var and secp256k1_gej_double return the Z ratio to go from a.z to r.z. * Use these Z ratios to speed up batch point conversion to affine coordinates, and to speed up batch conversion of points to a common Z coordinate. * Add a point addition function that takes a point with a known Z inverse. * Due to secp256k1's endomorphism, all additions in the EC multiplication code can work on affine coordinate (with an implicit common Z coordinate), correcting the Z coordinate of the result afterwards. Refactoring by Pieter Wuille: * Move more global-z logic into the group code. * Separate code for computing the odd multiples from the code to bring it to either storage or globalz format. * Rename functions. * Make all addition operations return Z ratios, and test them. * Make the zr table format compatible with future batch chaining (the first entry in zr becomes the ratio between the input and the first output). Original idea and code by Peter Dettman.