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from hashlib import sha256
#import jserialize as js
class ProtocolViolation(Exception):
"""Indicates that the communication protocol between this and a remote
client has been violated. In this case we abort from the communication."""
def __init__(self, reason="unknown"):
self.reason = reason
def __repr__(self):
return "ProtocolViolation(%s)"%self.reason
def constructor(func):
@classmethod
def f(cls, *args, **kwargs):
self = cls.__new__(cls)
func(self, *args, **kwargs)
return self
return f
def cachedproperty(func):
@property
def f(self):
if not hasattr(self, '_' + func.__name__):
setattr(self, '_' + func.__name__, func(self))
return getattr(self, '_' + func.__name__)
return f
def bits_to_target(bits):
return (bits & 0x00ffffff) * 2 ** (8 * ((bits >> 24) - 3))
def bits_to_diff(bits):
return bits_to_target(0x1d00ffff) // bits_to_target(bits)
def check_bits(bits, hash):
if bits_to_target(bits) > int(js.Hash.tojson(hash), 16):
return True
return False
def get_merkle_root(tree):
def pair_up(hashes):
if len(hashes) % 2 == 0:
return zip(*[iter(hashes)]*2)
else:
return list(zip(*[iter(hashes)]*2)) + [(hashes[-1], "")]
while len(tree) > 1:
tree = [doublesha(''.join(pair)) for pair in pair_up(tree)]
return tree[0]
def doublesha(data):
return sha256(sha256(data).digest()).digest()
def checksum(bdata):
return doublesha(bdata)[:4]
nullhash = "\x00"*32
blockreward = 5000000000
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