type Element --> struct FieldElement

src/ed25519/mod.rs

@@ -136,7 +136,7 @@ impl ED25519Public {
 
         let mut a = Point::new();
         x25519_ge_frombytes_vartime(&mut a, &self.public);
-        invert_vartime(&mut a);
+        a.invert();
         let h_digest = eddsa_digest(signature_r, &self.public, msg);
         let h = digest_scalar(&h_digest);
         let mut r = Point2::new();
@@ -164,14 +164,6 @@ fn digest_scalar(digest: &[u8]) -> Vec<u8> {
     copy[..32].to_vec()
 }
 
-fn invert_vartime(v: &mut Point)
-{
-    for i in 0..NUM_ELEMENT_LIMBS {
-        v.x[i] = -v.x[i];
-        v.t[i] = -v.t[i];
-    }
-}
-
 #[cfg(test)]
 fn run_signing_testcase(case: HashMap<String,(bool,Vec<u8>)>)
 {
@@ -207,4 +199,4 @@ fn rfc8072() {
 fn signing() {
     let fname = "testdata/ed25519/sign.test";
     run_test(fname.to_string(), 4, run_signing_testcase);
-}
+}