I recently wrote cgo bindings to the CTIDH C library (a bleeding edge post
quantum non-interactive key exchange) copies the data twice. First in the
call to C.CBytes and then again in the assignment to p.privateKey via that
pointer dereference.
The performance hit for the twice copy is not really a problem. I'm just
curious, is there's a more proper way to write this that avoids the twice
copy?
// FromBytes loads a PrivateKey from the given byte slice.
func (p *PrivateKey) FromBytes(data []byte) {
key := C.CBytes(data)
defer C.free(key)
p.privateKey = *((*C.private_key)(key))
}
https://git.xx.network/elixxir/ctidh_cgo/-/blob/master/binding.go#L49-54
Sincerely,
David
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