Add byte encodings for Binding, SpendAuth basepoints.

These were extracted by adding printlns to the test suite for librustzcash.

src/constants.rs

@@ -0,0 +1,15 @@
+/// The byte-encoding of the basepoint for `SpendAuthSig`.
+// Extracted ad-hoc from librustzcash
+// XXX add tests for this value.
+pub const SPENDAUTHSIG_BASEPOINT_BYTES: [u8; 32] = [
+    48, 181, 242, 170, 173, 50, 86, 48, 188, 221, 219, 206, 77, 103, 101, 109, 5, 253, 28, 194,
+    208, 55, 187, 83, 117, 182, 233, 109, 158, 1, 161, 215,
+];
+
+/// The byte-encoding of the basepoint for `BindingSig`.
+// Extracted ad-hoc from librustzcash
+// XXX add tests for this value.
+pub const BINDINGSIG_BASEPOINT_BYTES: [u8; 32] = [
+    139, 106, 11, 56, 185, 250, 174, 60, 59, 128, 59, 71, 176, 241, 70, 173, 80, 171, 34, 30, 110,
+    42, 251, 230, 219, 222, 69, 203, 169, 211, 129, 237,
+];

src/lib.rs

@@ -4,6 +4,7 @@
 
 //! Docs require the `nightly` feature until RFC 1990 lands.
 
+mod constants;
 mod error;
 mod public_key;
 mod secret_key;
@@ -44,11 +45,3 @@ mod private {
     impl Sealed for Binding {}
     impl Sealed for SpendAuth {}
 }
-
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn it_works() {
-        assert_eq!(2 + 2, 4);
-    }
-}