This is why I said that Glacier’s hash should not be emulated. FWIW, using a (root hash, data length) pair hides many sins, although I haven’t formally proven

This is why I said that Glacier’s hash should not be emulated. FWIW, using a (root hash, data length) pair hides many sins, although I haven’t formally proven this. And I don’t think that extension attacks are very relevant to the OCI use case.