citizenaspirant/PyBitmessage
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adding docstring and integer typecast

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f97ada87 2018-05-25 06:13:01 +00:00 committed by GitHub
parent 609a4a92e2
commit 5221f6a883
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1 changed files with 12 additions and 1 deletions
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13
src/protocol.py
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@ -170,12 +170,23 @@ def isProofOfWorkSufficient(data,
nonceTrialsPerByte=0,
payloadLengthExtraBytes=0,
recvTime=0):
"""
Validate an object's Proof of Work using method described in:
https://bitmessage.org/wiki/Proof_of_work
Arguments:
int nonceTrialsPerByte (default: from default.py)
int payloadLengthExtraBytes (default: from default.py)
float recvTime (optional) UNIX epoch time when object was
received from the network (default: current system time)
Returns:
True if PoW valid and sufficient, False in all other cases
"""
if nonceTrialsPerByte < defaults.networkDefaultProofOfWorkNonceTrialsPerByte:
nonceTrialsPerByte = defaults.networkDefaultProofOfWorkNonceTrialsPerByte
if payloadLengthExtraBytes < defaults.networkDefaultPayloadLengthExtraBytes:
payloadLengthExtraBytes = defaults.networkDefaultPayloadLengthExtraBytes
endOfLifeTime, = unpack('>Q', data[8:16])
TTL = endOfLifeTime - (recvTime if recvTime else int(time.time()))
TTL = endOfLifeTime - (int(recvTime) if recvTime else int(time.time()))
if TTL < 300:
TTL = 300
POW, = unpack('>Q', hashlib.sha512(hashlib.sha512(data[