Function tor_llcrypto::pk::keymanip::convert_curve25519_to_ed25519_private

pub fn convert_curve25519_to_ed25519_private(
    privkey: &StaticSecret
) -> Option<(ExpandedKeypair, u8)>

Available on crate feature cvt-x25519 only.

Convert a curve25519 private key to an ed25519 private key (and give a sign bit) to use with it, for use in ntor key cross-certification.

Note that this formula is not standardized; don’t use it for anything besides cross-certification.

NEVER use these keys to sign inputs that may be generated by an attacker.

Panics

If the debug_assertions feature is enabled, this function will double-check that the key it is about to return is the right private key for the public key returned by convert_curve25519_to_ed25519_public.

This panic should be impossible unless there are implementation bugs.