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Abstract out ComputeTapbranchHash

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This commit is contained in:
Russell O'Connor
2022-08-19 11:59:18 -04:00
parent 8e3fc99427
commit dee89438b8
4 changed files with 24 additions and 14 deletions
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19
src/script/interpreter.cpp
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@@ -1830,6 +1830,17 @@ uint256 ComputeTapleafHash(uint8_t leaf_version, Span<const unsigned char> scrip
return (HashWriter{HASHER_TAPLEAF} << leaf_version << CompactSizeWriter(script.size()) << script).GetSHA256();
}
uint256 ComputeTapbranchHash(Span<const unsigned char> a, Span<const unsigned char> b)
{
HashWriter ss_branch{HASHER_TAPBRANCH};
if (std::lexicographical_compare(a.begin(), a.end(), b.begin(), b.end())) {
ss_branch << a << b;
} else {
ss_branch << b << a;
}
return ss_branch.GetSHA256();
}
uint256 ComputeTaprootMerkleRoot(Span<const unsigned char> control, const uint256& tapleaf_hash)
{
assert(control.size() >= TAPROOT_CONTROL_BASE_SIZE);
@@ -1839,14 +1850,8 @@ uint256 ComputeTaprootMerkleRoot(Span<const unsigned char> control, const uint25
const int path_len = (control.size() - TAPROOT_CONTROL_BASE_SIZE) / TAPROOT_CONTROL_NODE_SIZE;
uint256 k = tapleaf_hash;
for (int i = 0; i < path_len; ++i) {
HashWriter ss_branch{HASHER_TAPBRANCH};
Span node{Span{control}.subspan(TAPROOT_CONTROL_BASE_SIZE + TAPROOT_CONTROL_NODE_SIZE * i, TAPROOT_CONTROL_NODE_SIZE)};
if (std::lexicographical_compare(k.begin(), k.end(), node.begin(), node.end())) {
ss_branch << k << node;
} else {
ss_branch << node << k;
}
k = ss_branch.GetSHA256();
k = ComputeTapbranchHash(k, node);
}
return k;
}