From 1d54c3e703157e6c39d5cd4fef1b52b4b52e8911 Mon Sep 17 00:00:00 2001
From: Filip Krawczyk <kotmawszy@gmail.com>
Date: Fri, 29 Dec 2023 13:12:44 +0100
Subject: [PATCH] Implement hash_blake_or_poseidon

---
 src/vector_commitment/vector_commitment.cairo | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/vector_commitment/vector_commitment.cairo b/src/vector_commitment/vector_commitment.cairo
index 08b0a3b31..774dcd75c 100644
--- a/src/vector_commitment/vector_commitment.cairo
+++ b/src/vector_commitment/vector_commitment.cairo
@@ -3,6 +3,17 @@ use cairo_verifier::common::{
     array_append::ArrayAppendTrait,
     blake2s::blake2s,
 };
+use poseidon::hades_permutation;
+
+
+fn hash_blake_or_poseidon(x: felt252, y: felt252, is_verifier_friendly: bool) -> felt252 {
+    if is_verifier_friendly {
+        let (hash, _, _) = hades_permutation(x, y, 2);
+        hash
+    } else {
+        truncated_blake2s(x, y)
+    }
+}
 
 fn truncated_blake2s(x: felt252, y: felt252) -> felt252 {
     let mut data = ArrayTrait::<u32>::new();