func MakeMerkleParent(left *wire.ShaHash, right *wire.ShaHash) *wire.ShaHash {
// dupes can screw things up; CVE-2012-2459. check for them
if left != nil && right != nil && left.IsEqual(right) {
fmt.Printf("DUP HASH CRASH")
return nil
}
// if left child is nil, output nil. Need this for hard mode.
if left == nil {
return nil
}
// if right is nil, hash left with itself
if right == nil {
right = left
}
// Concatenate the left and right nodes
var sha [64]byte
copy(sha[:32], left[:])
copy(sha[32:], right[:])
newSha := wire.DoubleSha256SH(sha[:])
return &newSha
}
