diff --git a/.github/workflows/cbc.yaml b/.github/workflows/cbc.yaml
index a0af2dc..7bc0c8a 100644
--- a/.github/workflows/cbc.yaml
+++ b/.github/workflows/cbc.yaml
@@ -28,7 +28,8 @@ jobs:
           - thumbv7em-none-eabi
           - wasm32-unknown-unknown
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
+      - uses: RustCrypto/actions/cargo-cache@master
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: ${{ matrix.rust }}
@@ -50,11 +51,12 @@ jobs:
           - 1.56.0 # MSRV
           - stable
     steps:
-    - uses: actions/checkout@v1
-    - uses: actions-rs/toolchain@v1
-      with:
-        toolchain: ${{ matrix.rust }}
-        override: true
-        profile: minimal
-    - run: cargo test
-    - run: cargo test --all-features
+      - uses: actions/checkout@v2
+      - uses: RustCrypto/actions/cargo-cache@master
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
+          override: true
+          profile: minimal
+      - run: cargo test
+      - run: cargo test --all-features
diff --git a/.github/workflows/cfb-mode.yaml b/.github/workflows/cfb-mode.yaml
index 3d45cd5..7c9ac19 100644
--- a/.github/workflows/cfb-mode.yaml
+++ b/.github/workflows/cfb-mode.yaml
@@ -28,7 +28,8 @@ jobs:
           - thumbv7em-none-eabi
           - wasm32-unknown-unknown
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
+      - uses: RustCrypto/actions/cargo-cache@master
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: ${{ matrix.rust }}
@@ -50,11 +51,12 @@ jobs:
           - 1.56.0 # MSRV
           - stable
     steps:
-    - uses: actions/checkout@v1
-    - uses: actions-rs/toolchain@v1
-      with:
-        toolchain: ${{ matrix.rust }}
-        override: true
-        profile: minimal
-    - run: cargo test
-    - run: cargo test --all-features
+      - uses: actions/checkout@v2
+      - uses: RustCrypto/actions/cargo-cache@master
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
+          override: true
+          profile: minimal
+      - run: cargo test
+      - run: cargo test --all-features
diff --git a/.github/workflows/cfb8.yaml b/.github/workflows/cfb8.yaml
index 990ef3a..18a8428 100644
--- a/.github/workflows/cfb8.yaml
+++ b/.github/workflows/cfb8.yaml
@@ -28,7 +28,8 @@ jobs:
           - thumbv7em-none-eabi
           - wasm32-unknown-unknown
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
+      - uses: RustCrypto/actions/cargo-cache@master
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: ${{ matrix.rust }}
@@ -50,11 +51,12 @@ jobs:
           - 1.56.0 # MSRV
           - stable
     steps:
-    - uses: actions/checkout@v1
-    - uses: actions-rs/toolchain@v1
-      with:
-        toolchain: ${{ matrix.rust }}
-        override: true
-        profile: minimal
-    - run: cargo test
-    - run: cargo test --all-features
+      - uses: actions/checkout@v2
+      - uses: RustCrypto/actions/cargo-cache@master
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
+          override: true
+          profile: minimal
+      - run: cargo test
+      - run: cargo test --all-features
diff --git a/.github/workflows/ctr.yaml b/.github/workflows/ctr.yaml
index 7edc38a..e9a9fe0 100644
--- a/.github/workflows/ctr.yaml
+++ b/.github/workflows/ctr.yaml
@@ -28,7 +28,8 @@ jobs:
           - thumbv7em-none-eabi
           - wasm32-unknown-unknown
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
+      - uses: RustCrypto/actions/cargo-cache@master
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: ${{ matrix.rust }}
@@ -50,11 +51,12 @@ jobs:
           - 1.56.0 # MSRV
           - stable
     steps:
-    - uses: actions/checkout@v1
-    - uses: actions-rs/toolchain@v1
-      with:
-        toolchain: ${{ matrix.rust }}
-        override: true
-        profile: minimal
-    - run: cargo test
-    - run: cargo test --all-features
+      - uses: actions/checkout@v2
+      - uses: RustCrypto/actions/cargo-cache@master
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
+          override: true
+          profile: minimal
+      - run: cargo test
+      - run: cargo test --all-features
diff --git a/.github/workflows/ige.yaml b/.github/workflows/ige.yaml
index 627a711..fab1254 100644
--- a/.github/workflows/ige.yaml
+++ b/.github/workflows/ige.yaml
@@ -28,7 +28,8 @@ jobs:
           - thumbv7em-none-eabi
           - wasm32-unknown-unknown
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
+      - uses: RustCrypto/actions/cargo-cache@master
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: ${{ matrix.rust }}
@@ -50,11 +51,12 @@ jobs:
           - 1.56.0 # MSRV
           - stable
     steps:
-    - uses: actions/checkout@v1
-    - uses: actions-rs/toolchain@v1
-      with:
-        toolchain: ${{ matrix.rust }}
-        override: true
-        profile: minimal
-    - run: cargo test
-    - run: cargo test --all-features
+      - uses: actions/checkout@v2
+      - uses: RustCrypto/actions/cargo-cache@master
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
+          override: true
+          profile: minimal
+      - run: cargo test
+      - run: cargo test --all-features
diff --git a/.github/workflows/ofb.yaml b/.github/workflows/ofb.yaml
index f440a96..4955c1f 100644
--- a/.github/workflows/ofb.yaml
+++ b/.github/workflows/ofb.yaml
@@ -28,7 +28,8 @@ jobs:
           - thumbv7em-none-eabi
           - wasm32-unknown-unknown
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
+      - uses: RustCrypto/actions/cargo-cache@master
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: ${{ matrix.rust }}
@@ -50,11 +51,12 @@ jobs:
           - 1.56.0 # MSRV
           - stable
     steps:
-    - uses: actions/checkout@v1
-    - uses: actions-rs/toolchain@v1
-      with:
-        toolchain: ${{ matrix.rust }}
-        override: true
-        profile: minimal
-    - run: cargo test
-    - run: cargo test --all-features
+      - uses: actions/checkout@v2
+      - uses: RustCrypto/actions/cargo-cache@master
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
+          override: true
+          profile: minimal
+      - run: cargo test
+      - run: cargo test --all-features
diff --git a/.github/workflows/pcbc.yaml b/.github/workflows/pcbc.yaml
index 7caaaf1..10406a0 100644
--- a/.github/workflows/pcbc.yaml
+++ b/.github/workflows/pcbc.yaml
@@ -28,7 +28,8 @@ jobs:
           - thumbv7em-none-eabi
           - wasm32-unknown-unknown
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
+      - uses: RustCrypto/actions/cargo-cache@master
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: ${{ matrix.rust }}
@@ -50,11 +51,12 @@ jobs:
           - 1.56.0 # MSRV
           - stable
     steps:
-    - uses: actions/checkout@v1
-    - uses: actions-rs/toolchain@v1
-      with:
-        toolchain: ${{ matrix.rust }}
-        override: true
-        profile: minimal
-    - run: cargo test
-    - run: cargo test --all-features
+      - uses: actions/checkout@v2
+      - uses: RustCrypto/actions/cargo-cache@master
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
+          override: true
+          profile: minimal
+      - run: cargo test
+      - run: cargo test --all-features
diff --git a/.github/workflows/security-audit.yml b/.github/workflows/security-audit.yml
index 0d82d54..4042a37 100644
--- a/.github/workflows/security-audit.yml
+++ b/.github/workflows/security-audit.yml
@@ -13,7 +13,7 @@ jobs:
     name: Security Audit
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - name: Cache cargo bin
         uses: actions/cache@v1
         with:
diff --git a/.github/workflows/workspace.yml b/.github/workflows/workspace.yml
index 599f211..4e52296 100644
--- a/.github/workflows/workspace.yml
+++ b/.github/workflows/workspace.yml
@@ -13,20 +13,21 @@ jobs:
   clippy:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
-    - uses: actions-rs/toolchain@v1
-      with:
-        toolchain: 1.56.0 # MSRV
-        components: clippy
-        override: true
-        profile: minimal
-    - run: cargo clippy --all --all-features -- -D warnings
+      - uses: actions/checkout@v2
+      - uses: RustCrypto/actions/cargo-cache@master
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: 1.56.0 # MSRV
+          components: clippy
+          override: true
+          profile: minimal
+      - run: cargo clippy --all --all-features -- -D warnings
 
   rustfmt:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
 
       - name: Install stable toolchain
         uses: actions-rs/toolchain@v1
@@ -40,14 +41,3 @@ jobs:
         with:
           command: fmt
           args: --all -- --check
-
-  benches:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v1
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: nightly
-          profile: minimal
-          override: true
-      - run: cargo build --all --benches
diff --git a/Cargo.lock b/Cargo.lock
index 9d0df10..8242bf2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -149,9 +149,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.118"
+version = "0.2.119"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "06e509672465a0504304aa87f9f176f2b2b716ed8fb105ebe5c02dc6dce96a94"
+checksum = "1bf2e165bb3457c8e098ea76f3e3bc9db55f87aa90d52d0e6be741470916aaa4"
 
 [[package]]
 name = "magma"