Greetings cgo experts, perhaps this post might also be of some interest to cryptography people as well.
What's the best way for a C cryptography library to receive entropy from golang? There exists a C cryptography library (CTIDH, it's a PQ NIKE)... I am collaborating with C programmers who are adding features to it. I maintain cgo bindings for this library. Thus far the cgo is straight forward and it works. However the C programmers recently added a constructor for private keys which takes a function pointer as an argument: https://codeberg.org/io/highctidh/src/branch/main/csidh.h#L50 /* * generate a new private key using rng_callback and write the result to (priv). * (priv) is passed as (context) to the rng_callback. */ void csidh_private_withrng(private_key *priv, ctidh_fillrandom rng_callback); I did get this to work with an ugly hack where the golang constructor takes an io.Reader interface object as an argument and sets an unexported module scoped global variable to the rng/io.Reader object, guarded by a mutex, gross: https://git.xx.network/elixxir/ctidh_cgo/-/commit/2e7fb078722decb07ab8da7fb59c8ec46fb32fd1 But that's a really ugly hack and if called by multiple threads would result in the rng getting overwritten... which in most cases is probably fine for that to happen but seems like a bad design. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/4ead4877-4225-4131-b304-82a331ddc1fan%40googlegroups.com.
