1 files changed, 43 insertions, 0 deletions
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..ce38f07
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,43 @@
+pub mod error;
+pub mod hibe;
+pub mod kem;
+
+use error::Result;
+
+/// A trait to provide byte-level access to objects.
+pub trait ByteAccess {
+    /// Provides access to the bytes.
+    ///
+    /// Unlike [`AsRef`], there are no statements made about the performance of this operation.
+    /// This operation will allocate a fresh vector, and the byte representation may or may not
+    /// have to be computed first.
+    fn bytes(&self) -> Vec<u8>;
+
+    /// Provide a short fingerprint of the bytes.
+    ///
+    /// This can be used to "summarize" long keys when displaying them, to still provide
+    /// distinguishing features but to not print out the whole key.
+    ///
+    /// By default, this method uses the first 16 bytes of the [`ByteAccess::bytes`]
+    /// representation, and formats them as a hex string.
+    fn fingerprint(&self) -> String {
+        hex::encode(&self.bytes()[..16])
+    }
+}
+
+/// A trait to mark objects that can map from an application-specific identity to a HIBE-specific
+/// identity.
+///
+/// A mapper can be implemented multiple times for a single struct, thereby providing multiple
+/// (equivalent) ways to map.
+pub trait Mapper<F, T> {
+    fn map_identity(&self, input: F) -> Result<Vec<T>>;
+}
+
+/// [`Mapper`] is automatically implemented for functions and closures that match the signature of
+/// [`Mapper::map_identity`].
+impl<X, Y, F: Fn(X) -> Result<Vec<Y>>> Mapper<X, Y> for F {
+    fn map_identity(&self, input: X) -> Result<Vec<Y>> {
+        self(input)
+    }
+}