Initial implementation (#1)

src/ciphersuite.rs

@@ -0,0 +1,17 @@
+// Copyright (c) Facebook, Inc. and its affiliates.
+//
+// This source code is licensed under the MIT license found in the
+// LICENSE file in the root directory of this source tree.
+
+//! Defines the CipherSuite trait to specify the underlying primitives for VOPRF
+
+use crate::{group::Group, hash::Hash};
+
+/// Configures the underlying primitives used in VOPRF
+pub trait CipherSuite {
+    /// A finite cyclic group along with a point representation that allows some
+    /// customization on how to hash an input to a curve point. See `group::Group`.
+    type Group: Group;
+    /// The main hash function to use (for HKDF computations and hashing transcripts).
+    type Hash: Hash;
+}