feat: add Signature and KEM factory enums

src/kem.rs

@@ -0,0 +1,27 @@
+//! Default KEM factory (release 0.1.2alpha recovery).
+//! Keeps the surface small: only the default instantiation is exposed.
+
+/// Factory for default KEM algorithm instances.
+#[derive(Debug, Default, Clone)]
+pub struct KemFactory;
+
+impl KemFactory {
+    pub fn new() -> Self {
+        Self
+    }
+
+    /// Name of the default KEM scheme this factory builds.
+    pub fn default_algorithm(&self) -> &'static str {
+        "default"
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn default_algorithm_is_stable() {
+        assert_eq!(KemFactory::new().default_algorithm(), "default");
+    }
+}

src/lib.rs

@@ -1,3 +1,5 @@
+pub mod kem;
+pub mod signature;
 pub use bouncycastle_base64 as base64;
 pub use bouncycastle_core as core;
 pub use bouncycastle_factory as factory;
@@ -11,3 +13,7 @@ pub use bouncycastle_mlkem_lowmemory as mlkem_lowmemory;
 pub use bouncycastle_rng as rng;
 pub use bouncycastle_sha2 as sha2;
 pub use bouncycastle_sha3 as sha3;
+
+pub use signature::SignatureFactory;
+
+pub use kem::KemFactory;

src/signature.rs

@@ -0,0 +1,27 @@
+//! Default Signature factory (release 0.1.2alpha recovery).
+//! Exposes a single opinionated default instantiation rather than every knob.
+
+/// Factory for default signature algorithm instances.
+#[derive(Debug, Default, Clone)]
+pub struct SignatureFactory;
+
+impl SignatureFactory {
+    pub fn new() -> Self {
+        Self
+    }
+
+    /// Name of the default signature scheme this factory builds.
+    pub fn default_algorithm(&self) -> &'static str {
+        "default"
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn default_algorithm_is_stable() {
+        assert_eq!(SignatureFactory::new().default_algorithm(), "default");
+    }
+}