Initial port-over of ECDSA signing.

src/ecdsa/public.rs

@@ -0,0 +1,11 @@
+use ecdsa::curves::EllipticCurve;
+use ecdsa::math::ECCPoint;
+
+#[allow(non_snake_case)]
+#[derive(Clone,Debug,PartialEq)]
+pub struct ECDSAPublic {
+    pub(crate) curve: EllipticCurve,
+    pub(crate) Q: ECCPoint
+}
+
+