Upgrade p256 to v0.12 (facebook#90)

* Upgrade `p256` to v0.12

* Upgrade MSRV to 1.60

.github/workflows/main.yml

@@ -43,7 +43,7 @@ jobs:
           - --features serde
         toolchain:
           - stable
-          - 1.57.0
+          - 1.60.0
     name: test
     steps:
       - name: Checkout sources

Cargo.toml

@@ -8,7 +8,7 @@ license = "MIT"
 name = "voprf"
 readme = "README.md"
 repository = "https://github.com/novifinancial/voprf/"
-rust-version = "1.57"
+rust-version = "1.60"
 version = "0.5.0-pre.1"
 
 [features]
@@ -45,7 +45,7 @@ zeroize = { version = "1.5", default-features = false }
 generic-array = { version = "0.14", features = ["more_lengths"] }
 hex = "0.4"
 json = "0.12"
-p256 = { version = "0.11", default-features = false, features = [
+p256 = { version = "0.12", default-features = false, features = [
   "hash2curve",
   "voprf",
 ] }

README.md

@@ -21,7 +21,7 @@ voprf = "0.5.0-pre.1"
 
 ### Minimum Supported Rust Version
 
-Rust **1.57** or higher.
+Rust **1.60** or higher.
 
 Contributors
 ------------

src/group/elliptic_curve.rs

@@ -23,7 +23,7 @@ use crate::{Error, InternalError, Result};
 impl<C> Group for C
 where
     C: GroupDigest,
-    ProjectivePoint<Self>: CofactorGroup + ToEncodedPoint<Self>,
+    ProjectivePoint<Self>: CofactorGroup,
     FieldSize<Self>: ModulusSize,
     AffinePoint<Self>: FromEncodedPoint<Self> + ToEncodedPoint<Self>,
     Scalar<Self>: FromOkm,
@@ -65,7 +65,8 @@ where
     }
 
     fn serialize_elem(elem: Self::Elem) -> GenericArray<u8, Self::ElemLen> {
-        let bytes = elem.to_encoded_point(true);
+        let affine: AffinePoint<Self> = elem.into();
+        let bytes = affine.to_encoded_point(true);
         let bytes = bytes.as_bytes();
         let mut result = GenericArray::default();
         result[..bytes.len()].copy_from_slice(bytes);