Switch to GitHub Actions; MSRV 1.41+

The MSRV bump is necessary to check in a merge-friendly Cargo.lock
(which is helpful for caching).

We'll want to do this bump anyway soon for `generic-array` v0.14. See:

<RustCrypto/traits#95>

.github/workspace/aes-ctr.yml

@@ -0,0 +1,56 @@
+name: aes-ctr
+
+on:
+  pull_request:
+    paths:
+      - "aes-ctr/**"
+      - "Cargo.*"
+  push:
+    branches: master
+    paths:
+      - "aes-ctr/**"
+      - "Cargo.*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - 1.41.0 # MSRV
+          - stable
+        target:
+          - thumbv7em-none-eabi
+          - wasm32-unknown-unknown
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          target: ${{ matrix.target }}
+          override: true
+      - run: cargo build --no-default-features --release --target ${{ matrix.target }}
+        working-directory: aes-ctr
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - 1.41.0 # MSRV
+          - stable
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions-rs/toolchain@v1
+      with:
+        profile: minimal
+        toolchain: ${{ matrix.rust }}
+        override: true
+    - run: cargo test
+      working-directory: aes-ctr
+    - run: cargo test --release
+      working-directory: aes-ctr
+    - run: cargo test --release
+      env:
+        RUSTFLAGS: "-C target-feature=+aes,+sse2,+ssse3"
+      working_directory: aes-ctr

.github/workspace/cfb-mode.yml

@@ -0,0 +1,52 @@
+name: cfb-mode
+
+on:
+  pull_request:
+    paths:
+      - "cfb-mode/**"
+      - "Cargo.*"
+  push:
+    branches: master
+    paths:
+      - "cfb-mode/**"
+      - "Cargo.*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - 1.41.0 # MSRV
+          - stable
+        target:
+          - thumbv7em-none-eabi
+          - wasm32-unknown-unknown
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          target: ${{ matrix.target }}
+          override: true
+      - run: cargo build --no-default-features --release --target ${{ matrix.target }}
+        working-directory: cfb-mode
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - 1.41.0 # MSRV
+          - stable
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          override: true
+      - run: cargo test
+        working-directory: cfb-mode
+      - run: cargo test --release
+        working-directory: cfb-mode

.github/workspace/cfb8.yml

@@ -0,0 +1,52 @@
+name: cfb8
+
+on:
+  pull_request:
+    paths:
+      - "cfb8/**"
+      - "Cargo.*"
+  push:
+    branches: master
+    paths:
+      - "cfb8/**"
+      - "Cargo.*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - 1.41.0 # MSRV
+          - stable
+        target:
+          - thumbv7em-none-eabi
+          - wasm32-unknown-unknown
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          target: ${{ matrix.target }}
+          override: true
+      - run: cargo build --no-default-features --release --target ${{ matrix.target }}
+        working-directory: cfb8
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - 1.41.0 # MSRV
+          - stable
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          override: true
+      - run: cargo test
+        working-directory: cfb8
+      - run: cargo test --release
+        working-directory: cfb8

.github/workspace/chacha20.yml

@@ -0,0 +1,60 @@
+name: chacha20
+
+on:
+  pull_request:
+    paths:
+      - "chacha20/**"
+      - "Cargo.*"
+  push:
+    branches: master
+    paths:
+      - "chacha20/**"
+      - "Cargo.*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - 1.41.0 # MSRV
+          - stable
+        target:
+          - thumbv7em-none-eabi
+          - wasm32-unknown-unknown
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          target: ${{ matrix.target }}
+          override: true
+      - run: cargo build --no-default-features --release --target ${{ matrix.target }}
+        working-directory: chacha20
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - 1.41.0 # MSRV
+          - stable
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          override: true
+      - run: cargo test
+        working-directory: chacha20
+      - run: cargo test --release
+        working-directory: chacha20
+      - run: cargo test --release
+        env:
+          RUSTFLAGS: "-Ctarget-feature=+sse2"
+        working-directory: chacha20
+      - run: cargo test --release
+        env:
+          RUSTFLAGS: "-Ctarget-feature=+avx2"
+        working-directory: chacha20

.github/workspace/ctr.yml

@@ -0,0 +1,52 @@
+name: ctr
+
+on:
+  pull_request:
+    paths:
+      - "ctr/**"
+      - "Cargo.*"
+  push:
+    branches: master
+    paths:
+      - "ctr/**"
+      - "Cargo.*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - 1.41.0 # MSRV
+          - stable
+        target:
+          - thumbv7em-none-eabi
+          - wasm32-unknown-unknown
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          target: ${{ matrix.target }}
+          override: true
+      - run: cargo build --no-default-features --release --target ${{ matrix.target }}
+        working-directory: ctr
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - 1.41.0 # MSRV
+          - stable
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          override: true
+      - run: cargo test
+        working-directory: ctr
+      - run: cargo test --release
+        working-directory: ctr

.github/workspace/hc-256.yml

@@ -0,0 +1,52 @@
+name: hc-256
+
+on:
+  pull_request:
+    paths:
+      - "hc-256/**"
+      - "Cargo.*"
+  push:
+    branches: master
+    paths:
+      - "hc-256/**"
+      - "Cargo.*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - 1.41.0 # MSRV
+          - stable
+        target:
+          - thumbv7em-none-eabi
+          - wasm32-unknown-unknown
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          target: ${{ matrix.target }}
+          override: true
+      - run: cargo build --no-default-features --release --target ${{ matrix.target }}
+        working-directory: hc-256
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - 1.41.0 # MSRV
+          - stable
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          override: true
+      - run: cargo test
+        working-directory: hc-256
+      - run: cargo test --release
+        working-directory: hc-256

.github/workspace/ofb.yml

@@ -0,0 +1,52 @@
+name: ofb
+
+on:
+  pull_request:
+    paths:
+      - "ofb/**"
+      - "Cargo.*"
+  push:
+    branches: master
+    paths:
+      - "ofb/**"
+      - "Cargo.*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - 1.41.0 # MSRV
+          - stable
+        target:
+          - thumbv7em-none-eabi
+          - wasm32-unknown-unknown
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          target: ${{ matrix.target }}
+          override: true
+      - run: cargo build --no-default-features --release --target ${{ matrix.target }}
+        working-directory: ofb
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - 1.41.0 # MSRV
+          - stable
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          override: true
+      - run: cargo test
+        working-directory: ofb
+      - run: cargo test --release
+        working-directory: ofb