1 files changed, 17 insertions, 0 deletions
diff --git a/openpgp/src/crypto/asymmetric.rs b/openpgp/src/crypto/asymmetric.rs
new file mode 100644
index 00000000..9a497f9a
--- /dev/null
+++ b/openpgp/src/crypto/asymmetric.rs
@@ -0,0 +1,17 @@
+//! Asymmetric crypto operations.
+
+use packet::Key;
+use crypto::mpis;
+use constants::HashAlgorithm;
+
+use Result;
+
+/// Creates a signature.
+pub trait Signer {
+    /// Returns a reference to the public key.
+    fn public(&self) -> &Key;
+
+    /// Creates a signature over the `digest` produced by `hash_algo`.
+    fn sign(&mut self, hash_algo: HashAlgorithm, digest: &[u8])
+            -> Result<mpis::Signature>;
+}