mpc: add MerkleTree::into_proofs

commit_verify/src/mpc/block.rs

@@ -601,6 +601,13 @@ Changed commitment id: {}",
     /// `2 ^ depth - cofactor`.
     pub fn factored_width(&self) -> u32 { self.width_limit() - self.cofactor as u32 }
 
+    pub fn known_protocol_ids(&self) -> impl Iterator<Item = ProtocolId> + '_ {
+        self.cross_section.iter().filter_map(|item| match item {
+            TreeNode::ConcealedNode { .. } => None,
+            TreeNode::CommitmentLeaf { protocol_id, .. } => Some(*protocol_id),
+        })
+    }
+
     /// Constructs [`MessageMap`] for revealed protocols and messages.
     pub fn to_known_message_map(&self) -> MessageMap {
         Confined::try_from_iter(
@@ -617,6 +624,18 @@ Changed commitment id: {}",
         )
         .expect("same collection size")
     }
+
+    pub fn into_known_proofs(self) -> impl Iterator<Item = (ProtocolId, MerkleProof)> {
+        self.known_protocol_ids()
+            .collect::<Vec<_>>()
+            .into_iter()
+            .map(move |id| {
+                let proof = self
+                    .to_merkle_proof(id)
+                    .expect("protocol ids must strictly match");
+                (id, proof)
+            })
+    }
 }
 
 impl Conceal for MerkleBlock {

commit_verify/src/mpc/tree.rs

@@ -27,7 +27,8 @@ pub use self::commit::Error;
 use crate::merkle::MerkleHash;
 use crate::mpc::atoms::Leaf;
 use crate::mpc::{
-    Commitment, MerkleBlock, MerkleConcealed, Message, MessageMap, Method, Proof, ProtocolId,
+    Commitment, MerkleBlock, MerkleConcealed, MerkleProof, Message, MessageMap, Method, Proof,
+    ProtocolId,
 };
 use crate::{CommitId, Conceal, LIB_NAME_COMMIT_VERIFY};
 
@@ -205,6 +206,11 @@ impl MerkleTree {
     pub fn cofactor(&self) -> u16 { self.cofactor }
 
     pub fn entropy(&self) -> u64 { self.entropy }
+
+    pub fn into_proofs(self) -> impl Iterator<Item = (ProtocolId, MerkleProof)> {
+        let block = MerkleBlock::from(self);
+        block.into_known_proofs()
+    }
 }
 
 #[cfg(test)]