From e90a5972f1b824b4494f04b00efec66ea79be66b Mon Sep 17 00:00:00 2001
From: Jack Grigg <jack@electriccoin.co>
Date: Sun, 13 Jun 2021 22:25:37 +0100
Subject: [PATCH] redpallas: Expose batch validation API

---
 src/primitives/redpallas.rs | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/src/primitives/redpallas.rs b/src/primitives/redpallas.rs
index 5b2c2611..f367c0b8 100644
--- a/src/primitives/redpallas.rs
+++ b/src/primitives/redpallas.rs
@@ -5,6 +5,8 @@ use std::convert::{TryFrom, TryInto};
 use pasta_curves::pallas;
 use rand::{CryptoRng, RngCore};
 
+pub use reddsa::batch;
+
 #[cfg(test)]
 use rand::rngs::OsRng;
 
@@ -108,6 +110,26 @@ impl VerificationKey<SpendAuth> {
     pub fn randomize(&self, randomizer: &pallas::Scalar) -> Self {
         VerificationKey(self.0.randomize(randomizer))
     }
+
+    /// Creates a batch validation item from a `SpendAuth` signature.
+    pub fn create_batch_item<M: AsRef<[u8]>>(
+        &self,
+        sig: Signature<SpendAuth>,
+        msg: &M,
+    ) -> batch::Item<SpendAuth, Binding> {
+        batch::Item::from_spendauth(self.0.into(), sig.0, msg)
+    }
+}
+
+impl VerificationKey<Binding> {
+    /// Creates a batch validation item from a `Binding` signature.
+    pub fn create_batch_item<M: AsRef<[u8]>>(
+        &self,
+        sig: Signature<Binding>,
+        msg: &M,
+    ) -> batch::Item<SpendAuth, Binding> {
+        batch::Item::from_binding(self.0.into(), sig.0, msg)
+    }
 }
 
 /// A RedPallas signature.