Created
March 23, 2022 20:50
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Crates a Merkle Tree using the given data, per light Clients for Lazy Blockchains paper by Ertem Nusret Tas et. al
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import hashlib | |
import binascii | |
def H(data): | |
if type(data) == str: | |
data = str.encode(data) | |
if type(data) == int: | |
data = data.to_bytes(4, 'big') | |
return hashlib.sha256(data).digest() | |
class Tree: | |
def __init__(self, root, data, left, right): | |
self.root = root | |
self.data = data | |
self.left = left | |
self.right = right | |
def makeMerkleTree(dataList): | |
if len(dataList) == 1: | |
return Tree(H(dataList[0]), dataList[0], None, None) | |
mid = len(dataList)//2 | |
tree = Tree(None, None, makeMerkleTree(dataList[:mid]), makeMerkleTree(dataList[mid:])) | |
tree.root = H(tree.left.root + tree.right.root) | |
return tree | |
def printInOrder(tree): | |
if tree.root: | |
if tree.left: | |
printInOrder(tree.left) | |
print("hash:", binascii.hexlify(bytearray(tree.root))) | |
print("data:", tree.data) | |
if tree.right: | |
printInOrder(tree.right) | |
data = [0,1,2,3,4] | |
merkleTree = makeMerkleTree(data) | |
print("data:", data) | |
print("\ntree root:", binascii.hexlify(bytearray(merkleTree.root))) | |
print("\ntree:") | |
printInOrder(merkleTree) |
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