Implement serde traits for Fq2, Fq6, Fq12.

Cargo.toml

@@ -18,7 +18,7 @@ repository = "https://github.com/ebfull/pairing"
 rand = "0.4"
 byteorder = "1"
 ff = { version = "0.4", features = ["derive"] }
-serde = { version = "1.0", optional = true }
+serde = { version = "1.0", optional = true, features = ["derive"] }
 
 [features]
 unstable-features = ["expose-arith"]

src/bls12_381/fq12.rs

@@ -6,6 +6,7 @@ use rand::{Rand, Rng};
 
 /// An element of Fq12, represented by c0 + c1 * w.
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct Fq12 {
     pub c0: Fq6,
     pub c1: Fq6,

src/bls12_381/fq2.rs

@@ -6,6 +6,7 @@ use std::cmp::Ordering;
 
 /// An element of Fq2, represented by c0 + c1 * u.
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct Fq2 {
     pub c0: Fq,
     pub c1: Fq,

src/bls12_381/fq6.rs

@@ -5,6 +5,7 @@ use rand::{Rand, Rng};
 
 /// An element of Fq6, represented by c0 + c1 * v + c2 * v^(2).
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct Fq6 {
     pub c0: Fq2,
     pub c1: Fq2,

src/bls12_381/serde_impl.rs

@@ -1,4 +1,4 @@
-use super::{Fq, FqRepr, Fr, FrRepr, G1, G1Affine, G2, G2Affine};
+use super::{Fq, FqRepr, Fr, FrRepr, G1Affine, G2Affine, G1, G2};
 use {CurveAffine, CurveProjective, EncodedPoint, PrimeField};
 
 use serde::de::Error as DeserializeError;
@@ -125,6 +125,7 @@ mod tests {
     extern crate serde_json;
 
     use super::*;
+    use bls12_381::Fq12;
 
     use std::fmt::Debug;
 
@@ -166,4 +167,11 @@ mod tests {
         test_roundtrip(&f);
         test_roundtrip(&f.into_repr());
     }
+
+    #[test]
+    fn serde_fq12() {
+        let mut rng = XorShiftRng::from_seed([0x5dbe6259, 0x8d313d76, 0x3237db17, 0xe5bc0654]);
+        let f: Fq12 = rng.gen();
+        test_roundtrip(&f);
+    }
 }

src/lib.rs

@@ -16,6 +16,7 @@ extern crate byteorder;
 extern crate ff;
 extern crate rand;
 #[cfg(feature = "serde")]
+#[macro_use(Serialize, Deserialize)]
 extern crate serde;
 
 #[cfg(test)]