refactor: feature-gate openmls impls in obfuscate

This enables us to add a dependency to `obfuscate` from `rusty-jwt-tools`
without a transitive openmls dependency.

Author: coriolinus

crypto-ffi/Cargo.toml

@@ -39,7 +39,7 @@ proteus-wasm = { workspace = true, optional = true }
 core-crypto-keystore.workspace = true
 core-crypto-macros.workspace = true
 core-crypto.workspace = true
-obfuscate.workspace = true
+obfuscate = { workspace = true, features = ["openmls"] }
 rmp-serde.workspace = true
 paste = "1.0.15"
 hex.workspace = true

crypto/Cargo.toml

@@ -65,7 +65,7 @@ core-crypto-keystore.workspace = true
 typed-builder.workspace = true
 core-crypto-macros.workspace = true
 rand.workspace = true
-obfuscate.workspace = true
+obfuscate = { workspace = true, features = ["openmls"] }
 
 [target.'cfg(not(target_family = "wasm"))'.dependencies]
 async-fs = { version = "2.2", optional = true }

keystore/Cargo.toml

@@ -38,7 +38,7 @@ serde_json.workspace = true
 core-crypto-macros.workspace = true
 rand = { workspace = true, features = ["getrandom"] }
 getrandom = { version = "0.2", features = ["js"] }
-obfuscate = { workspace = true }
+obfuscate = { workspace = true, features = ["openmls"] }
 openmls_traits = { workspace = true }
 openmls_basic_credential = { workspace = true }
 openmls_x509_credential = { workspace = true }

obfuscate/Cargo.toml

@@ -7,10 +7,13 @@ rust-version = "1.90"
 [dependencies]
 hex.workspace = true
 sha2.workspace = true
-openmls.workspace = true
+openmls = { workspace = true, optional = true }
 derive_more.workspace = true
 rand.workspace = true
 log.workspace = true
 
 [lints]
 workspace = true
+
+[features]
+default = []

obfuscate/README.md

@@ -2,3 +2,9 @@
 
 Defines an `Obfuscate` trait with implementations for external types and a wrapper type for usage during debug logging.
 Used by `#[sensitive]` fields of structs deriving `crypto_macros::Debug`.
+
+## Cargo Features
+
+No features are included in the default set.
+
+- `openmls`: implements `Obfuscate` for some openmls types.

obfuscate/src/impls/mod.rs

@@ -1,2 +1,3 @@
+#[cfg(feature = "openmls")]
 pub mod openmls;
 pub mod std;