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feat(merkle_root): commit changes

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Signed-off-by: Johns Beharry <johns@peakshift.com>
This commit is contained in:
Johns Beharry 2019-01-23 11:47:57 -04:00
parent fa2bae4cc1
commit 39dc8437e8
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GPG Key ID: EC114974742E2178
1 changed files with 19 additions and 13 deletions
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32
beacon_chain/utils/hashing/src/merkle_root.rs
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@ -1,29 +1,35 @@
use types::{Hash256}
use hashing::canonical_hash;
use std::iter::range_step;
fn merkle_root(values: Vec<T>) -> Hash256 {
let mut o = vec![0; values.len()];
pub fn merkle_root(values: Vec<T>) -> Hash256 {
let mut o: Vec<&[u8]> = vec![0; values.len()];
let mut value_hashes = vec![];
for v in values {
value_hashes.push(canonical_hash(v);
}
o.append(values);
for v in range_step(values - 1, 0, -1) {
canonical_hash(v.as_bytes());
for i in (0..values.len() - 1).rev() {
canonical_hash(o[i * 2] + o[i * 2 + 1]);
}
o[1];
}
#[cfg(test)]
mod tests {
#[test]
fn calculate_merkle_root() {
let values = vec!['abc', 'lmn', 'xyz', 'o0o'];
let values = vec!["abc", "lmn", "xyz", "o0o"];
let test_leaf_1 = canonical_hash(values[0]);
let test_leaf_2 = canonical_hash(values[1]);
let test_leaf_3 = canonical_hash(values[2]);
let test_leaf_4 = canonical_hash(values[3]);
let test_node_1 = canonical_hash(vec![test_leaf_4, test_leaf_3]);
let test_node_2 = canonical_hash(vec![test_leaf_2, test_leaf_1]);
let test_root = canonical_hash(vec![test_node_1, test_node_2]);
let test_leaf_0 = canonical_hash(values[0]);
let test_leaf_1 = canonical_hash(values[1]);
let test_leaf_2 = canonical_hash(values[2]);
let test_leaf_3 = canonical_hash(values[3]);
let test_node_0 = canonical_hash(test_leaf_3 + test_leaf_2);
let test_node_1 = canonical_hash(test_leaf_1 + test_leaf_0);
let test_root = canonical_hash(test_node_0 + test_node_0);
let result = merkle_root(values);
assert_eq!(result, test_root);