Bitmessage/PyBitmessage-2024-12-11
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Make PoW optional in disseminatePreEncryptedMsg

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This commit is contained in:
Lee Miller 2023-01-05 07:17:46 +02:00
parent 44a4a370a6
commit 7836538290
Signed by untrusted user: lee.miller
GPG Key ID: 4F97A5EA88F4AB63
1 changed files with 41 additions and 37 deletions
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78
src/api.py
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@ -66,7 +66,7 @@ import socket
import subprocess # nosec B404
import time
from binascii import hexlify, unhexlify
from struct import pack
from struct import pack, unpack
import six
from six.moves import configparser, http_client, xmlrpc_server
@ -1292,49 +1292,53 @@ class BMRPCDispatcher(object):
Handle a request to disseminate an encrypted message.
The device issuing this command to PyBitmessage supplies a msg object
that has already been encrypted but which still needs the PoW
that has already been encrypted but which may still need the PoW
to be done. PyBitmessage accepts this msg object and sends it out
to the rest of the Bitmessage network as if it had generated
the message itself.
*encryptedPayload* is a hex encoded string
*encryptedPayload* is a hex encoded string starting with the nonce,
8 zero bytes in case of no PoW done.
"""
encryptedPayload = b'\x00' * 8 + self._decode(encryptedPayload, "hex")
# compatibility stub ^, since disseminatePreEncryptedMsg
# still expects the encryptedPayload without a nonce
encryptedPayload = self._decode(encryptedPayload, "hex")
nonce, = unpack('>Q', encryptedPayload[:8])
objectType, toStreamNumber, expiresTime = \
protocol.decodeObjectParameters(encryptedPayload)
encryptedPayload = encryptedPayload[8:]
TTL = expiresTime - time.time() + 300 # a bit of extra padding
# Let us do the POW and attach it to the front
target = 2**64 / (
nonceTrialsPerByte * (
len(encryptedPayload) + 8 + payloadLengthExtraBytes + ((
TTL * (
len(encryptedPayload) + 8 + payloadLengthExtraBytes
)) / (2 ** 16))
))
logger.debug("expiresTime: %s", expiresTime)
logger.debug("TTL: %s", TTL)
logger.debug("objectType: %s", objectType)
logger.info(
'(For msg message via API) Doing proof of work. Total required'
' difficulty: %s\nRequired small message difficulty: %s',
float(nonceTrialsPerByte)
/ networkDefaultProofOfWorkNonceTrialsPerByte,
float(payloadLengthExtraBytes)
/ networkDefaultPayloadLengthExtraBytes,
)
powStartTime = time.time()
initialHash = hashlib.sha512(encryptedPayload).digest()
trialValue, nonce = proofofwork.run(target, initialHash)
logger.info(
'(For msg message via API) Found proof of work %s\nNonce: %s\n'
'POW took %s seconds. %s nonce trials per second.',
trialValue, nonce, int(time.time() - powStartTime),
nonce / (time.time() - powStartTime)
)
encryptedPayload = pack('>Q', nonce) + encryptedPayload
if nonce == 0: # Let us do the POW and attach it to the front
encryptedPayload = encryptedPayload[8:]
TTL = expiresTime - time.time() + 300 # a bit of extra padding
# Let us do the POW and attach it to the front
logger.debug("expiresTime: %s", expiresTime)
logger.debug("TTL: %s", TTL)
logger.debug("objectType: %s", objectType)
logger.info(
'(For msg message via API) Doing proof of work. Total required'
' difficulty: %s\nRequired small message difficulty: %s',
float(nonceTrialsPerByte)
/ networkDefaultProofOfWorkNonceTrialsPerByte,
float(payloadLengthExtraBytes)
/ networkDefaultPayloadLengthExtraBytes,
)
powStartTime = time.time()
target = 2**64 / (
nonceTrialsPerByte * (
len(encryptedPayload) + 8 + payloadLengthExtraBytes + ((
TTL * (
len(encryptedPayload) + 8 + payloadLengthExtraBytes
)) / (2 ** 16))
))
initialHash = hashlib.sha512(encryptedPayload).digest()
trialValue, nonce = proofofwork.run(target, initialHash)
logger.info(
'(For msg message via API) Found proof of work %s\nNonce: %s\n'
'POW took %s seconds. %s nonce trials per second.',
trialValue, nonce, int(time.time() - powStartTime),
nonce / (time.time() - powStartTime)
)
encryptedPayload = pack('>Q', nonce) + encryptedPayload
inventoryHash = calculateInventoryHash(encryptedPayload)
Inventory()[inventoryHash] = (
objectType, toStreamNumber, encryptedPayload,