elliptic-curve: fix hkdf version requirement and test in CI (#1353)

The minimal supported version of `hkdf` is v0.12.1, which added a
generic parameter with a default which selects the backend.

This also (mostly) re-enables a `minimal-versions` check in CI, although
it still doesn't quite test all features.

.github/workflows/elliptic-curve.yml

@@ -57,19 +57,17 @@ jobs:
  - run: cargo build --target ${{ matrix.target }} --release --no-default-features --features arithmetic,serde
  - run: cargo build --target ${{ matrix.target }} --release --no-default-features --features alloc,digest,ecdh,hazmat,hash2curve,jwk,pem,pkcs8,sec1,serde,voprf
 
- # TODO: use the reusable workflow after this crate is re-added to the
- # toplevel workspace
- # minimal-versions:
- # runs-on: ubuntu-latest
- # steps:
- # - uses: actions/checkout@v4
- # - uses: RustCrypto/actions/cargo-cache@master
- # - uses: dtolnay/rust-toolchain@master
- # with:
- # toolchain: nightly
- # - uses: RustCrypto/actions/cargo-hack-install@master
- # - run: cargo update -Z minimal-versions
- # - run: cargo hack test --release --feature-powerset
+ minimal-versions:
+ runs-on: ubuntu-latest
+ steps:
+ - uses: actions/checkout@v4
+ - uses: RustCrypto/actions/cargo-cache@master
+ - uses: dtolnay/rust-toolchain@master
+ with:
+ toolchain: nightly
+ - uses: RustCrypto/actions/cargo-hack-install@master
+ - run: cargo update -Z minimal-versions
+ - run: cargo build --release --features ecdh,hash2curve,pem,std,voprf # TODO(tarcieri): test all features
 
  test:
  runs-on: ubuntu-latest

elliptic-curve/Cargo.toml

@@ -28,7 +28,7 @@ base64ct = { version = "1", optional = true, default-features = false, features
 digest = { version = "0.10", optional = true }
 ff = { version = "0.13", optional = true, default-features = false }
 group = { version = "0.13", optional = true, default-features = false }
-hkdf = { version = "0.12", optional = true, default-features = false }
+hkdf = { version = "0.12.1", optional = true, default-features = false }
 hex-literal = { version = "0.4", optional = true }
 pem-rfc7468 = { version = "0.7", optional = true, features = ["alloc"] }
 pkcs8 = { version = "0.10.2", optional = true, default-features = false }