Add a test using public Scalars

tests/pubscalars.rs

@@ -0,0 +1,37 @@
+#![allow(non_snake_case)]
+use curve25519_dalek::ristretto::RistrettoPoint as G;
+use group::ff::PrimeField;
+use group::Group;
+use sha2::Sha512;
+use sigma_compiler::*;
+
+#[test]
+fn pubscalars_test() -> Result<(), sigma_rs::errors::Error> {
+    sigma_compiler! { proof,
+        (x, z, rand r, rand s, pub a, pub b),
+        (C, D, const cind A, const cind B),
+        C = x*A + r*B,
+        D = z*A + s*B,
+        z = 2*x + a,
+        b = 2*a - 3,
+    }
+
+    type Scalar = <G as Group>::Scalar;
+    let mut rng = rand::thread_rng();
+    let A = G::hash_from_bytes::<Sha512>(b"Generator A");
+    let B = G::generator();
+    let r = Scalar::random(&mut rng);
+    let s = Scalar::random(&mut rng);
+    let x = Scalar::from_u128(5);
+    let z = Scalar::from_u128(17);
+    let a = Scalar::from_u128(7);
+    let b = Scalar::from_u128(11);
+    let C = x * A + r * B;
+    let D = z * A + s * B;
+
+    let params = proof::Params { C, D, A, B, a, b };
+    let witness = proof::Witness { x, z, r, s };
+
+    let proof = proof::prove(&params, &witness)?;
+    proof::verify(&params, &proof)
+}