make edwards an optional feature, and separate benches

Cargo.toml

@@ -8,7 +8,12 @@ crypto-bigint = { version = "0.6.1" }
 
 [features]
 rand = ["crypto-bigint/rand"]
+edwards = []
 
 [[bench]]
-name = "benchmarks"
-path = "bench/bench.rs"
+name = "montgomery"
+path = "bench/montgomery.rs"
+
+[[bench]]
+name = "edwards"
+path = "bench/edwards.rs"

bench/edwards.rs

@@ -0,0 +1,48 @@
+#![cfg(feature = "edwards")]
+#![feature(test)]
+
+extern crate test;
+
+mod benches {
+    use test::{black_box, Bencher};
+    use crypto_bigint::U448;
+    use diffie_hellman::edwards::{ed448_clamp, ED448_GOLDILOCKS};
+    use diffie_hellman::traits::{Curve, Point};
+
+    #[bench]
+    fn edwards_point_add(b: &mut Bencher) {
+        let p = ED448_GOLDILOCKS.generator();
+        let q = p.double();
+
+        b.iter(|| {
+            black_box(p.add(&q, &p))
+        })
+    }
+
+    #[bench]
+    fn edwards_point_double(b: &mut Bencher) {
+        let p = ED448_GOLDILOCKS.generator();
+
+        b.iter(|| {
+            black_box(p.double())
+        })
+    }
+
+    #[bench]
+    fn edwards_ladder(b: &mut Bencher) {
+        let p = ED448_GOLDILOCKS.point(U448::from_u32(123456789));
+
+        b.iter(|| {
+            black_box(p.ladder(&ed448_clamp(U448::from_u64(987654321))))
+        })
+    }
+
+    #[bench]
+    fn constant_time_edwards_ladder(b: &mut Bencher) {
+        let p = ED448_GOLDILOCKS.point(U448::from_u32(123456789));
+
+        b.iter(|| {
+            black_box(p.ct_ladder(&ed448_clamp(U448::from_u64(987654321))))
+        })
+    }
+}

bench/montgomery.rs

@@ -1,4 +1,5 @@
 #![feature(test)]
+
 extern crate test;
 
 mod benches {
@@ -64,42 +65,5 @@ mod benches {
             black_box(p.ct_ladder(&clamp_u256(U256::from_u64(987654321))))
         })
     }
-
-    #[bench]
-    fn edwards_point_add(b: &mut Bencher) {
-        let p = CURVE_25519.generator();
-        let q = p.double();
-
-        b.iter(|| {
-            black_box(p.add(&q, &p))
-        })
-    }
-
-    #[bench]
-    fn edwards_point_double(b: &mut Bencher) {
-        let p = ED448_GOLDILOCKS.generator();
-
-        b.iter(|| {
-            black_box(p.double())
-        })
-    }
-
-    #[bench]
-    fn edwards_ladder(b: &mut Bencher) {
-        let p = ED448_GOLDILOCKS.point(U448::from_u32(123456789));
-
-        b.iter(|| {
-            black_box(p.ladder(&ed448_clamp(U448::from_u64(987654321))))
-        })
-    }
-
-    #[bench]
-    fn constant_time_edwards_ladder(b: &mut Bencher) {
-        let p = ED448_GOLDILOCKS.point(U448::from_u32(123456789));
-
-        b.iter(|| {
-            black_box(p.ct_ladder(&ed448_clamp(U448::from_u64(987654321))))
-        })
-    }
 }
 

src/edwards.rs

@@ -1,3 +1,5 @@
+#![cfg(feature = "edwards")]
+
 use crate::traits::{Curve, Point};
 use crypto_bigint::{AddMod, ConstZero, Integer, InvMod, MulMod, NonZero, SubMod, U448};
 use std::ops::Div;

src/lib.rs

@@ -1,6 +1,7 @@
 #[macro_use]
 mod macros;
 
+#[cfg(feature = "edwards")]
 pub mod edwards;
 pub mod montgomery;
 pub mod traits;