Expose crypto_core_ed25519_from_uniform

Question

Expose crypto_core_ed25519_from_uniform

AnonimaUzanto opened this issue a year ago · comments

Included in the libsodium low level functions is crypto_core_ed25519_from_uniform which provides the ability to apply Elligator 2 mapping to map arbitrary 32-byte data to a valid curve point. This functionality can be used to convert hashed data to a valid curve point. I have added and tested the applicable code in a fork and can provide a PR to add the functionality. Can this functionality be added to PyNaCl?

Prior issue:
(https://github.com/pyca/pynacl/pull/528#issuecomment-498176836

Source documentation:
https://doc.libsodium.org/advanced/point-arithmetic#elligator-2-map

Paul Kehrer · Answer 1 · Tue May 02 2023 20:03:54 GMT+0800 (China Standard Time)

We'd be happy to review a PR exposing this.

AnonimaUzanto · Answer 2 · Wed May 03 2023 01:32:42 GMT+0800 (China Standard Time)

Thank you! I have created a PR although there is a failure that I believe is related to Sphinx and not the exposed function. I have not used Sphinx so I am not sure how to resolve that error.

AnonimaUzanto · Answer 3 · Fri May 05 2023 12:33:12 GMT+0800 (China Standard Time)

Closing issue, thank you for approving PR!