tree ceb04172eae56af944af7e1650eff34cb85a2324
parent 8f25cbbb688f4a31b84c6f7494021b4c0537977c
author Alexander Afanasyev <alexander.afanasyev@ucla.edu> 1330676584 -0800
committer Alexander Afanasyev <alexander.afanasyev@ucla.edu> 1330676584 -0800

Small extension of Digest. Now it supports adding other digests.

Basically, we're building a hash tree, where leaves as hash(data), next
levels are hash(hash(data)), next levels are hash(hash(hash(data))), etc.

(Though, right now we going to have a very limited and hard-coded number
of levels of this hash tree)