merkle-tree-stream 0.0.1a2

A stream that generates a merkle tree based on the incoming data.

A stream that generates a merkle tree based on the incoming data

From The Dat Protocol:

A hash tree or merkle tree is a tree in which every leaf node is labelled with the hash of a data block and every non-leaf node is labelled with the cryptographic hash of the labels of its child nodes. Merkle trees in Dat are specialized flat trees that contain the content of the archives.

See the following for more:

• The Dat Protocol: Merkle Tree

• The Dat Protocol: Merkle Tree Stream

A note on naming

For the purposes of uniformity and easy of discovery alongside the reference implementation, we use the same module name as merkle-tree-stream. This may cause confusion since it is not clear what exactly is referred to when using the term “stream” in the context of Python. To be clear, this module provides a Python iterator which appears to match the implementation and meaning of the reference implementation.

from hashlib import sha256
from merkle_tree_stream import MerkleTreeIterator


def leaf(node, roots=None):
    return sha256(node.data).digest()

def parent(first, second):
    sha256 = hashlib.sha256()
    sha256.update(first.data)
    sha256.update(second.data)
    return sha256.digest()

merkle_iter = MerkleTreeIterator(leaf=leaf, parent=parent)
merkle_iter.write('hello')
merkle_iter.write('hashed')
merkle_iter.write('world')

Documentation

• merkle-tree-stream.readthedocs.io

Mirroring

• hack.decentral1.se/datpy/merkle-tree-stream

• github.com/datpy/merkle-tree-stream