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Revert "Optimize merkle proofs for efficient verification in Solidity (#12857)" (#14176)

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* Revert "Optimize merkle proofs for efficient verification in Solidity (#12857)"

This reverts commit c077597afb since we
still require commitment to the leaves - see #12820.

* remove PartialOrd trait from mmr hash type
This commit is contained in:
Robert Hambrock
2023-05-22 13:55:40 +02:00
committed by GitHub
parent 86870ad0f0
commit 09a7e69012
3 changed files with 28 additions and 31 deletions
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substrate/utils/binary-merkle-tree/src/lib.rs
+22 -24
View File
@@ -27,8 +27,7 @@
//! Merkle Tree is constructed from arbitrary-length leaves, that are initially hashed using the
//! same hasher as the inner nodes.
//! Inner nodes are created by concatenating child hashes and hashing again. The implementation
//! sorts each pair of hashes before every hash operation. This makes proof verification more
//! efficient by removing the need to track which side each intermediate hash is concatenated on.
//! does not perform any sorting of the input data (leaves) nor when inner nodes are created.
//!
//! If the number of leaves is not even, last leaf (hash of) is promoted to the upper layer.
#[cfg(not(feature = "std"))]
@@ -48,7 +47,7 @@ use hash_db::Hasher;
pub fn merkle_root<H, I>(leaves: I) -> H::Out
where
H: Hasher,
H::Out: Default + AsRef<[u8]> + PartialOrd,
H::Out: Default + AsRef<[u8]>,
I: IntoIterator,
I::Item: AsRef<[u8]>,
{
@@ -59,7 +58,7 @@ where
fn merkelize<H, V, I>(leaves: I, visitor: &mut V) -> H::Out
where
H: Hasher,
H::Out: Default + AsRef<[u8]> + PartialOrd,
H::Out: Default + AsRef<[u8]>,
V: Visitor<H::Out>,
I: Iterator<Item = H::Out>,
{
@@ -144,7 +143,7 @@ impl<T> Visitor<T> for () {
pub fn merkle_proof<H, I, T>(leaves: I, leaf_index: usize) -> MerkleProof<H::Out, T>
where
H: Hasher,
H::Out: Default + Copy + AsRef<[u8]> + PartialOrd,
H::Out: Default + Copy + AsRef<[u8]>,
I: IntoIterator<Item = T>,
I::IntoIter: ExactSizeIterator,
T: AsRef<[u8]>,
@@ -244,7 +243,7 @@ pub fn verify_proof<'a, H, P, L>(
) -> bool
where
H: Hasher,
H::Out: PartialEq + AsRef<[u8]> + PartialOrd,
H::Out: PartialEq + AsRef<[u8]>,
P: IntoIterator<Item = H::Out>,
L: Into<Leaf<'a, H::Out>>,
{
@@ -259,13 +258,15 @@ where
let hash_len = <H as Hasher>::LENGTH;
let mut combined = vec![0_u8; hash_len * 2];
let mut position = leaf_index;
let mut width = number_of_leaves;
let computed = proof.into_iter().fold(leaf_hash, |a, b| {
if a < b {
combined[..hash_len].copy_from_slice(&a.as_ref());
combined[hash_len..].copy_from_slice(&b.as_ref());
} else {
if position % 2 == 1 || position + 1 == width {
combined[..hash_len].copy_from_slice(&b.as_ref());
combined[hash_len..].copy_from_slice(&a.as_ref());
} else {
combined[..hash_len].copy_from_slice(&a.as_ref());
combined[hash_len..].copy_from_slice(&b.as_ref());
}
let hash = <H as Hasher>::hash(&combined);
#[cfg(feature = "debug")]
@@ -276,6 +277,8 @@ where
array_bytes::bytes2hex("", &hash.as_ref()),
array_bytes::bytes2hex("", &combined.as_ref())
);
position /= 2;
width = ((width - 1) / 2) + 1;
hash
});
@@ -294,7 +297,7 @@ fn merkelize_row<H, V, I>(
) -> Result<H::Out, Vec<H::Out>>
where
H: Hasher,
H::Out: AsRef<[u8]> + PartialOrd,
H::Out: AsRef<[u8]>,
V: Visitor<H::Out>,
I: Iterator<Item = H::Out>,
{
@@ -320,13 +323,8 @@ where
index += 2;
match (a, b) {
(Some(a), Some(b)) => {
if a < b {
combined[..hash_len].copy_from_slice(a.as_ref());
combined[hash_len..].copy_from_slice(b.as_ref());
} else {
combined[..hash_len].copy_from_slice(b.as_ref());
combined[hash_len..].copy_from_slice(a.as_ref());
}
combined[..hash_len].copy_from_slice(a.as_ref());
combined[hash_len..].copy_from_slice(b.as_ref());
next.push(<H as Hasher>::hash(&combined));
},
@@ -419,12 +417,12 @@ mod tests {
};
test(
"5842148bc6ebeb52af882a317c765fccd3ae80589b21a9b8cbf21abb630e46a7",
"aff1208e69c9e8be9b584b07ebac4e48a1ee9d15ce3afe20b77a4d29e4175aa3",
vec!["a", "b", "c"],
);
test(
"7b84bec68b13c39798c6c50e9e40a0b268e3c1634db8f4cb97314eb243d4c514",
"b8912f7269068901f231a965adfefbc10f0eedcfa61852b103efd54dac7db3d7",
vec!["a", "b", "a"],
);
@@ -434,7 +432,7 @@ mod tests {
);
test(
"cc50382cfd3c9a617741e9a85efee8752b8feb95a2cbecd6365fb21366ce0c8c",
"fb3b3be94be9e983ba5e094c9c51a7d96a4fa2e5d8e891df00ca89ba05bb1239",
vec!["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"],
);
}
@@ -752,7 +750,7 @@ mod tests {
"0xc26B34D375533fFc4c5276282Fa5D660F3d8cbcB",
];
let root: H256 = array_bytes::hex2array_unchecked(
"7b2c6eebec6e85b2e272325a11c31af71df52bc0534d2d4f903e0ced191f022e",
"72b0acd7c302a84f1f6b6cefe0ba7194b7398afb440e1b44a9dbbe270394ca53",
)
.into();
@@ -797,11 +795,11 @@ mod tests {
)
.into(),
array_bytes::hex2array_unchecked(
"1fad92ed8d0504ef6c0231bbbeeda960a40693f297c64e87b582beb92ecfb00f"
"d02609d2bbdb28aa25f58b85afec937d5a4c85d37925bce6d0cf802f9d76ba79"
)
.into(),
array_bytes::hex2array_unchecked(
"0b84c852cbcf839d562d826fd935e1b37975ccaa419e1def8d219df4b83dcbf4"
"ae3f8991955ed884613b0a5f40295902eea0e0abe5858fc520b72959bc016d4e"
)
.into(),
],