Update to v4 WIP

.cargo/config

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+[target.riscv32imac-unknown-xous-elf]
+rustflags = ["--cfg",'curve25519_dalek_backend="u32e_backend"']

.github/workflows/cross.yml

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+name: Cross
+
+on:
+  push:
+    branches: [ '**' ]
+  pull_request:
+    branches: [ '**' ]
+
+env:
+  CARGO_TERM_COLOR: always
+  RUSTFLAGS: '-D warnings'
+
+jobs:
+
+  test-cross:
+    name: Test
+    strategy:
+      matrix:
+        include:
+          # ARM32
+          - target: armv7-unknown-linux-gnueabihf
+            rust: stable
+
+          # ARM64
+          - target: aarch64-unknown-linux-gnu
+            rust: stable
+
+          # PPC32
+          - target: powerpc-unknown-linux-gnu
+            rust: stable
+
+    # TODO: We only test x/ed/curve for cross as derive is platform specifics
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - run: ${{ matrix.deps }}
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.rust }}
+          targets: ${{ matrix.target }}
+      - uses: RustCrypto/actions/cross-install@master
+      - run: cross test -p curve25519-dalek --release --target ${{ matrix.target }}
+      - run: cross test -p ed25519-dalek --release --target ${{ matrix.target }}
+      - run: cross test -p x25519-dalek --release --target ${{ matrix.target }}

.github/workflows/curve25519-dalek.yml

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+name: curve25519 Rust
+
+on:
+  push:
+    branches: [ '**' ]
+    paths:
+      - 'curve25519-dalek/**'
+      - '.github/workflows/curve25519-dalek.yml'
+  pull_request:
+    branches: [ '**' ]
+    paths:
+      - 'curve25519-dalek/**'
+      - '.github/workflows/curve25519-dalek.yml'
+
+defaults:
+  run:
+    working-directory: curve25519-dalek
+
+env:
+  CARGO_TERM_COLOR: always
+  RUSTFLAGS: '-D warnings'
+
+jobs:
+
+  test-fiat:
+    name: Test fiat backend
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          # 32-bit target
+          - target: i686-unknown-linux-gnu
+            deps: sudo apt update && sudo apt install gcc-multilib
+
+          # 64-bit target
+          - target: x86_64-unknown-linux-gnu
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dtolnay/rust-toolchain@stable
+      - run: rustup target add ${{ matrix.target }}
+      - run: ${{ matrix.deps }}
+      - env:
+          RUSTFLAGS: '--cfg curve25519_dalek_backend="fiat"'
+        run: cargo test --target ${{ matrix.target }}
+
+  # Default no_std test only tests using serial across all crates
+  build-nostd-fiat:
+    name: Build fiat on no_std target (thumbv7em-none-eabi)
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - crate: curve25519-dalek
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: stable
+          targets: thumbv7em-none-eabi
+      - uses: taiki-e/install-action@cargo-hack
+      # No default features build
+      - name: no_std fiat / no feat ${{ matrix.crate }}
+        env:
+          RUSTFLAGS: '--cfg curve25519_dalek_backend="fiat"'
+        run: cargo build -p ${{ matrix.crate }} --target thumbv7em-none-eabi --release --no-default-features
+      - name: no_std fiat / cargo hack ${{ matrix.crate }}
+        env:
+          RUSTFLAGS: '--cfg curve25519_dalek_backend="fiat"'      
+        run: cargo hack build -p ${{ matrix.crate }} --target thumbv7em-none-eabi --release --each-feature --exclude-features default,std,getrandom
+
+  test-serial:
+    name: Test serial backend
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          # 32-bit target
+          - target: i686-unknown-linux-gnu
+            deps: sudo apt update && sudo apt install gcc-multilib
+
+          # 64-bit target
+          - target: x86_64-unknown-linux-gnu
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dtolnay/rust-toolchain@stable
+      - run: rustup target add ${{ matrix.target }}
+      - run: ${{ matrix.deps }}
+      - env:
+          RUSTFLAGS: '--cfg curve25519_dalek_backend="serial"'
+        run: cargo test --target ${{ matrix.target }}
+
+  build-script:
+    name: Test Build Script
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: stable
+          targets: wasm32-unknown-unknown,x86_64-unknown-linux-gnu,i686-unknown-linux-gnu
+      - run: bash tests/build_tests.sh
+
+  test-simd-nightly:
+    name: Test simd backend (nightly)
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: dtolnay/rust-toolchain@nightly
+    - env:
+        # This will:
+        #   1) build all of the x86_64 SIMD code,
+        #   2) run all of the SIMD-specific tests that the test runner supports,
+        #   3) run all of the normal tests using the best available SIMD backend.
+        # This should automatically pick up the simd backend in a x84_64 runner
+        RUSTFLAGS: '-C target_cpu=native'
+      run: cargo test --target x86_64-unknown-linux-gnu
+
+  test-simd-stable:
+    name: Test simd backend (stable)
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: dtolnay/rust-toolchain@stable
+    - env:
+        # This will run AVX2-specific tests and run all of the normal tests
+        # with the AVX2 backend, even if the runner supports AVX512.
+        # This should automatically pick up the simd backend in a x86_64 runner
+        # It should pick AVX2 due to stable toolchain used since AVX512 requires nigthly
+        RUSTFLAGS: '-C target_feature=+avx2'
+      run: cargo test --no-default-features --features alloc,precomputed-tables,zeroize,group-bits --target x86_64-unknown-linux-gnu
+
+  msrv:
+    name: Current MSRV is 1.60.0
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    # Re-resolve Cargo.lock with minimal versions
+    - uses: dtolnay/rust-toolchain@nightly
+    - run: cargo update -Z minimal-versions
+    # Now check that `cargo build` works with respect to the oldest possible
+    # deps and the stated MSRV
+    - uses: dtolnay/[email protected]
+    - run: cargo build --no-default-features --features serde
+    # Also make sure the AVX2 build works
+    - run: cargo build --target x86_64-unknown-linux-gnu

.github/workflows/ed25519-dalek.yml

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+name: ed25519 Rust
+
+on:
+  push:
+    branches: [ '**' ]
+    paths: 'ed25519-dalek/**'
+  pull_request:
+    branches: [ '**' ]
+    paths: 'ed25519-dalek/**'
+
+defaults:
+  run:
+    working-directory: ed25519-dalek
+
+env:
+  CARGO_TERM_COLOR: always
+  RUSTFLAGS: '-D warnings'
+  RUSTDOCFLAGS: '-D warnings'
+
+jobs:
+
+  msrv:
+    name: Current MSRV is 1.60.0
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+      # Re-resolve Cargo.lock with minimal versions
+    - uses: dtolnay/rust-toolchain@nightly
+    - run: cargo update -Z minimal-versions
+      # Now check that `cargo build` works with respect to the oldest possible
+      # deps and the stated MSRV
+    - uses: dtolnay/[email protected]
+    - run: cargo build