Revert "p521: remove vaporware crate (#115)" (#606)

This reverts commit 9c4a886.

Revives the skeleton of a `p521` crate which was previously removed in
PR #115, with the goal of turning it into a full-fledged P-521
implementation.

.github/workflows/p521.yml

@@ -0,0 +1,85 @@
+name: p521
+
+on:
+  pull_request:
+    paths:
+      - ".github/workflows/p521.yml"
+      - "p521/**"
+      - "Cargo.*"
+  push:
+    branches: master
+
+defaults:
+  run:
+    working-directory: p521
+
+env:
+  CARGO_INCREMENTAL: 0
+  RUSTFLAGS: "-Dwarnings"
+  RUSTDOCFLAGS: "-Dwarnings"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - 1.57.0 # MSRV
+          - stable
+        target:
+          - thumbv7em-none-eabi
+          - wasm32-unknown-unknown
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
+          target: ${{ matrix.target }}
+          override: true
+          profile: minimal
+      - run: cargo build --target ${{ matrix.target }} --release --no-default-features
+
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          # 32-bit Linux
+          - target: i686-unknown-linux-gnu
+            rust: 1.57.0 # MSRV
+            deps: sudo apt update && sudo apt install gcc-multilib
+          - target: i686-unknown-linux-gnu
+            rust: stable
+            deps: sudo apt update && sudo apt install gcc-multilib
+
+          # 64-bit Linux
+          - target: x86_64-unknown-linux-gnu
+            rust: 1.57.0 # MSRV
+          - target: x86_64-unknown-linux-gnu
+            rust: stable
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          target: ${{ matrix.target }}
+          override: true
+      - run: ${{ matrix.deps }}
+      - run: cargo check --target ${{ matrix.target }} --all-features
+      - run: cargo test --release --target ${{ matrix.target }} --no-default-features
+      - run: cargo test --release --target ${{ matrix.target }}
+      - run: cargo test --release --target ${{ matrix.target }} --all-features
+
+  doc:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: RustCrypto/actions/cargo-cache@master
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+          profile: minimal
+      - run: cargo doc --all-features

.gitignore

@@ -1,3 +1,2 @@
 target
-**/Cargo.lock
 *.sw*

Cargo.toml

@@ -6,6 +6,7 @@ members = [
     "k256",
     "p256",
     "p384",
+    "p521"
 ]
 
 [profile.dev]

README.md

@@ -19,6 +19,7 @@ and can be easily used for bare-metal or WebAssembly programming.
 | [`k256`]  | [secp256k1]        | ✅            | [![crates.io](https://img.shields.io/crates/v/k256.svg)](https://crates.io/crates/k256) | [![Documentation](https://docs.rs/k256/badge.svg)](https://docs.rs/k256) | ![build](https://github.com/RustCrypto/elliptic-curves/workflows/k256/badge.svg?branch=master&event=push) |
 | [`p256`]  | [NIST P-256]       | ✅            | [![crates.io](https://img.shields.io/crates/v/p256.svg)](https://crates.io/crates/p256) | [![Documentation](https://docs.rs/p256/badge.svg)](https://docs.rs/p256) | ![build](https://github.com/RustCrypto/elliptic-curves/workflows/p256/badge.svg?branch=master&event=push) |
 | [`p384`]  | [NIST P-384]       | ✅            | [![crates.io](https://img.shields.io/crates/v/p384.svg)](https://crates.io/crates/p384) | [![Documentation](https://docs.rs/p384/badge.svg)](https://docs.rs/p384) | ![build](https://github.com/RustCrypto/elliptic-curves/workflows/p384/badge.svg?branch=master&event=push) |
+| [`p521`]  | [NIST P-521]       | 🚧            | [![crates.io](https://img.shields.io/crates/v/p521.svg)](https://crates.io/crates/p521) | [![Documentation](https://docs.rs/p521/badge.svg)](https://docs.rs/p521) | ![build](https://github.com/RustCrypto/elliptic-curves/workflows/p521/badge.svg?branch=master&event=push) |
 
 NOTE: Some crates contain field/point arithmetic implementations gated under the
 `arithmetic` cargo feature as noted above.
@@ -63,13 +64,15 @@ dual licensed as above, without any additional terms or conditions.
 [`k256`]: https://github.com/RustCrypto/elliptic-curves/tree/master/k256
 [`p256`]: https://github.com/RustCrypto/elliptic-curves/tree/master/p256
 [`p384`]: https://github.com/RustCrypto/elliptic-curves/tree/master/p384
+[`p521`]: https://github.com/RustCrypto/elliptic-curves/tree/master/p521
 
 [//]: # (curves)
 
 [secp256k1]: https://en.bitcoin.it/wiki/Secp256k1
 [NIST P-256]: http://oid-info.com/get/1.2.840.10045.3.1.7
 [NIST P-384]: http://oid-info.com/get/1.3.132.0.34
+[NIST P-521]: http://oid-info.com/get/1.3.132.0.35
 
-[//]: # (general links)
+[//]: # (links)
 
 [other-curves]: https://github.com/RustCrypto/elliptic-curves/issues/114

p521/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "p521"
+description = "NIST P-521 (secp521r1) elliptic curve"
+version = "0.0.0"
+authors = ["RustCrypto Developers"]
+license = "Apache-2.0 OR MIT"
+documentation = "https://docs.rs/elliptic-curve"
+repository = "https://github.com/RustCrypto/elliptic-curves/tree/master/p521"
+readme = "README.md"
+edition = "2018"
+categories = ["cryptography", "no-std"]
+keywords = ["crypto", "ecc", "nist", "secp521r1"]
+
+[dependencies]
+elliptic-curve = { version = "0.12.1", default-features = false, features = ["hazmat", "sec1"] }
+
+[features]
+std = ["elliptic-curve/std"]
+
+[package.metadata.docs.rs]
+all-features = true