primitives: elgamal: publicize key fields

plonk/Cargo.toml

@@ -86,7 +86,6 @@ test_apis = ["ark-bn254", "rand", "ark-mpc/test_helpers"]
 parallel = [
     "ark-ec/parallel",
     "ark-ff/parallel",
-    "ark-mpc/multithreaded_executor",
     "ark-poly/parallel",
     "ark-std/parallel",
     "jf-utils/parallel",

primitives/src/elgamal.rs

@@ -44,7 +44,8 @@ pub struct EncKey<P>
 where
     P: Config,
 {
-    pub(crate) key: Projective<P>,
+    /// The underlying elliptic curve point
+    pub key: Projective<P>,
 }
 
 impl<P: Config> Hash for EncKey<P> {
@@ -69,11 +70,12 @@ impl<P: Config> PartialEq for EncKey<P> {
     Clone(bound = "P: Config"),
     PartialEq(bound = "P: Config")
 )]
-pub(crate) struct DecKey<P>
+pub struct DecKey<P>
 where
     P: Config,
 {
-    key: P::ScalarField,
+    /// The underlying field element of the key
+    pub key: P::ScalarField,
 }
 
 impl<P: Config> Drop for DecKey<P> {
@@ -117,8 +119,10 @@ pub struct Ciphertext<P>
 where
     P: Config,
 {
-    pub(crate) ephemeral: EncKey<P>,
-    pub(crate) data: Vec<P::BaseField>,
+    /// The ephemeral key used for encryption
+    pub ephemeral: EncKey<P>,
+    /// The encrypted data
+    pub data: Vec<P::BaseField>,
 }
 
 impl<P> Ciphertext<P>
@@ -166,6 +170,11 @@ where
         KeyPair { enc, dec }
     }
 
+    /// Get the decryption key
+    pub fn dec_key(&self) -> DecKey<P> {
+        self.dec.clone()
+    }
+
     /// Get decryption key reference
     pub(crate) fn dec_key_ref(&self) -> &DecKey<P> {
         &self.dec

relation/src/gadgets/ecc/mod.rs

@@ -116,7 +116,7 @@ where
 
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
 /// Represent variable of an EC point.
-pub struct PointVariable(Variable, Variable);
+pub struct PointVariable(pub Variable, pub Variable);
 
 impl PointVariable {
     /// Get the variable representing the x coordinate of the point.