Add benchmarks (#16)

* ci: add benchmark CI job

* chore: update bench example

* build: add bencher deps & other metadata

* chore: add bench tests & code refactor for perf

* ci: reduce benchmark ci run time

.github/workflows/build.yml

@@ -102,7 +102,29 @@ jobs:
         run: cargo test --locked --release --no-run --workspace
 
 # TODO: add fuzz tests
-# TODO: add benchmarks
+
+  benchmarks:
+    name: Run benchmarks
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Install nightly toolchain
+        uses: dtolnay/rust-toolchain@nightly
+
+      - name: Smoke-test benchmark program
+        run: cargo run -p rustls-mbedcrypto-provider --release --locked --example bench
+        env:
+          # Ensure benchmark does not take too long time
+          BENCH_MULTIPLIER: 0.3
+
+      - name: Run micro-benchmarks
+        run: cargo bench --locked --all-features
+        env:
+          RUSTFLAGS: --cfg=bench
 
   docs:
     name: Check for documentation errors

rustls-mbedcrypto-provider/Cargo.toml

@@ -43,6 +43,7 @@ webpki-roots = "0.26.0"
 rustls-pemfile = "2"
 env_logger = "0.10"
 log = { version = "0.4.4" }
+bencher = "0.1.5"
 
 [features]
 default = ["logging", "tls12"]
@@ -57,3 +58,10 @@ path = "examples/client.rs"
 [[example]]
 name = "bench"
 path = "examples/internal/bench.rs"
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs"]
+
+[package.metadata.cargo_check_external_types]
+allowed_external_types = ["rustls_pki_types::*"]