tendermint_hash

src/tendermint_hash.rs

@@ -0,0 +1,40 @@
+use sha2::{Sha256, Digest};
+
+fn hash(bytes: &[u8]) -> [u8; 32] {
+    let mut hasher = Sha256::new();
+    hasher.update(bytes);
+    let result: [u8; 32] = hasher.finalize().into();
+    result
+}
+
+const LEAF_PREFIX: &[u8] = &[0];
+const INNER_PREFIX: &[u8] = &[1];
+
+fn leaf_hash(bytes: &[u8]) -> [u8; 32] {
+    hash([LEAF_PREFIX, bytes].concat().as_slice())
+}
+
+fn inner_hash(left: &[u8], right: &[u8]) -> [u8; 32] {
+    hash([INNER_PREFIX, left, right].concat().as_slice())
+}
+
+pub struct TmSha2Hasher;
+
+impl TmSha2Hasher {
+    pub fn new() -> Self {
+        TmSha2Hasher
+    }
+}
+
+impl MerkleHash for TmSha2Hasher {
+    type Output = [u8; 32];
+
+    const EMPTY_ROOT : Self::Output = [227, 176, 196, 66, 152, 252, 28, 20, 154, 251, 244, 200, 153, 111, 185, 36, 39, 174, 65, 228, 100, 155, 147, 76, 164, 149, 153, 27, 120, 82, 184, 85];
+
+    fn hash_leaf(&self, data: &[u8]) -> Self::Output {
+        leaf_hash(data)
+    }
+    fn hash_nodes(&self, left: &Self::Output, right: &Self::Output) -> Self::Output {
+        inner_hash(left, right)
+    }
+}