Start modularizing FROST tests as per https://github.com/serai-dex/serai/issues/9

crypto/frost/src/tests/schnorr.rs

@@ -0,0 +1,32 @@
+use rand_core::{RngCore, CryptoRng};
+
+use ff::Field;
+
+use crate::{Curve, schnorr, algorithm::SchnorrSignature};
+
+pub(crate) fn sign<R: RngCore + CryptoRng, C: Curve>(rng: &mut R) {
+  let private_key = C::F::random(&mut *rng);
+  let nonce = C::F::random(&mut *rng);
+  let challenge = C::F::random(rng); // Doesn't bother to craft an HRAM
+  assert!(
+    schnorr::verify::<C>(
+      C::generator_table() * private_key,
+      challenge,
+      &schnorr::sign(private_key, nonce, challenge)
+    )
+  );
+}
+
+// The above sign function verifies signing works
+// This verifies invalid signatures don't pass, using zero signatures, which should effectively be
+// random
+pub(crate) fn verify<R: RngCore + CryptoRng, C: Curve>(rng: &mut R) {
+  assert!(
+    !schnorr::verify::<C>(
+      C::generator_table() * C::F::random(&mut *rng),
+      C::F::random(rng),
+      &SchnorrSignature { R: C::generator_table() * C::F::zero(), s: C::F::zero() }
+    )
+  );
+}
+