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skip leading zeros when computing root

This commit is contained in:
lukechampine 2020-02-02 16:40:32 -05:00
parent 617550f073
commit 6c1c802729
1 changed files with 3 additions and 3 deletions
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6
blake3.go
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@ -298,14 +298,14 @@ type Hasher struct {
used uint64 // bit vector indicating which stack elems are valid; also number of chunks added
}
func (h *Hasher) hasSubtreeAtHeight(i uint64) bool {
func (h *Hasher) hasSubtreeAtHeight(i int) bool {
return h.used&(1<<i) != 0
}
// addChunkChainingValue appends a chunk to the right edge of the Merkle tree.
func (h *Hasher) addChunkChainingValue(cv [8]uint32) {
// seek to first open stack slot, merging subtrees as we go
i := uint64(0)
i := 0
for ; h.hasSubtreeAtHeight(i); i++ {
cv = parentNode(h.stack[i], cv, h.key, h.flags).chainingValue()
}
@ -317,7 +317,7 @@ func (h *Hasher) addChunkChainingValue(cv [8]uint32) {
// chainStack.
func (h *Hasher) rootNode() node {
n := h.cs.node()
for i := uint64(bits.TrailingZeros64(h.used)); i < 64; i++ {
for i := bits.TrailingZeros64(h.used); i < bits.Len64(h.used); i++ {
if h.hasSubtreeAtHeight(i) {
n = parentNode(h.stack[i], n.chainingValue(), h.key, h.flags)
}