Use the same crypto backend as rustls on our side too

.github/workflows/test.yml

@@ -140,7 +140,7 @@ jobs:
       - name: Install cargo hack
         run: cargo install cargo-hack
       - name: Check lint
-        run: cargo hack check --feature-powerset --no-dev-deps -p async-nats
+        run: cargo hack check --feature-powerset --at-least-one-of aws-lc-rs,ring --no-dev-deps -p async-nats
 
 
   check_licenses:

async-nats/Cargo.toml

@@ -14,6 +14,7 @@ keywords = ["nats", "client", "messaging", "api"]
 categories = ["network-programming", "api-bindings"]
 
 [dependencies]
+aws-lc-rs = { version = "1.6", optional = true }
 memchr = "2.4"
 bytes = { version = "1.4.0", features = ["serde"] }
 futures = { version = "0.3.28", default-features = false, features = ["std"] }
@@ -35,7 +36,7 @@ tracing = "0.1"
 thiserror = "1.0"
 base64 = "0.22"
 tryhard = "0.5"
-ring = "0.17"
+ring = { version = "0.17", optional = true }
 rand = "0.8"
 webpki = { package = "rustls-webpki", version = "0.102" }
 portable-atomic = "1"
@@ -60,8 +61,8 @@ num = "0.4.1"
 default = ["server_2_10", "ring"]
 # Enables Service API for the client.
 service = []
-aws-lc-rs = ["tokio-rustls/aws-lc-rs"]
-ring = ["tokio-rustls/ring"]
+aws-lc-rs = ["dep:aws-lc-rs", "tokio-rustls/aws-lc-rs"]
+ring = ["dep:ring", "tokio-rustls/ring"]
 fips = ["aws-lc-rs", "tokio-rustls/fips"]
 # All experimental features are part of this feature flag.
 experimental = ["service"]

async-nats/src/crypto.rs

@@ -1,4 +1,12 @@
-use ring::digest::{Context, SHA256};
+#[cfg(feature = "aws-lc-rs")]
+use aws_lc_rs as crypto_backend;
+#[cfg(not(feature = "aws-lc-rs"))]
+use ring as crypto_backend;
+
+#[cfg(not(any(feature = "aws-lc-rs", feature = "ring")))]
+compile_error!("Please enable the `aws-lc-rs` or `ring` feature");
+
+use crypto_backend::digest::{Context, SHA256};
 
 pub(crate) struct Sha256(Context);