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add checks #1

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10 changes: 10 additions & 0 deletions blast-geth/beacon/merkle/merkle.go
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,16 @@ func (m *Value) UnmarshalJSON(input []byte) error {
// VerifyProof verifies a Merkle proof branch for a single value in a
// binary Merkle tree (index is a generalized tree index).
func VerifyProof(root common.Hash, index uint64, branch Values, value Value) error {
// Check for empty branch
if len(branch) == 0 {
return errors.New("empty branch provided")
}

// Validate index range
if index >= (1 << uint(len(branch))) {
return errors.New("index out of range for provided branch length")
}

hasher := sha256.New()
for _, sibling := range branch {
hasher.Reset()
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