Reference client for Bitmessage: a P2P encrypted decentralised communication protocol:
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import threading
import shared
import time
from time import strftime, localtime, gmtime
import random
from subprocess import call # used when the API must execute an outside program
from addresses import *
import highlevelcrypto
import proofofwork
import sys
import tr
from debug import logger
from helper_sql import *
import helper_inbox
from helper_generic import addDataPadding
import l10n
# This thread, of which there is only one, does the heavy lifting:
# calculating POWs.
class singleWorker(threading.Thread):
def __init__(self):
# QThread.__init__(self, parent)
threading.Thread.__init__(self)
def run(self):
queryreturn = sqlQuery(
'''SELECT DISTINCT toaddress FROM sent WHERE (status='awaitingpubkey' AND folder='sent')''')
for row in queryreturn:
toAddress, = row
toStatus, toAddressVersionNumber, toStreamNumber, toRipe = decodeAddress(toAddress)
if toAddressVersionNumber <= 3 :
shared.neededPubkeys[toRipe] = 0
elif toAddressVersionNumber >= 4:
doubleHashOfAddressData = hashlib.sha512(hashlib.sha512(encodeVarint(
toAddressVersionNumber) + encodeVarint(toStreamNumber) + toRipe).digest()).digest()
privEncryptionKey = doubleHashOfAddressData[:32] # Note that this is the first half of the sha512 hash.
tag = doubleHashOfAddressData[32:]
shared.neededPubkeys[tag] = (toAddress, highlevelcrypto.makeCryptor(privEncryptionKey.encode('hex'))) # We'll need this for when we receive a pubkey reply: it will be encrypted and we'll need to decrypt it.
# Initialize the shared.ackdataForWhichImWatching data structure
queryreturn = sqlQuery(
'''SELECT ackdata FROM sent where (status='msgsent' OR status='doingmsgpow')''')
for row in queryreturn:
ackdata, = row
print 'Watching for ackdata', ackdata.encode('hex')
shared.ackdataForWhichImWatching[ackdata] = 0
queryreturn = sqlQuery(
'''SELECT DISTINCT toaddress FROM sent WHERE (status='doingpubkeypow' AND folder='sent')''')
for row in queryreturn:
toaddress, = row
self.requestPubKey(toaddress)
time.sleep(
10) # give some time for the GUI to start before we start on existing POW tasks.
self.sendMsg()
# just in case there are any pending tasks for msg
# messages that have yet to be sent.
self.sendBroadcast()
# just in case there are any tasks for Broadcasts
# that have yet to be sent.
while True:
command, data = shared.workerQueue.get()
if command == 'sendmessage':
self.sendMsg()
elif command == 'sendbroadcast':
self.sendBroadcast()
elif command == 'doPOWForMyV2Pubkey':
self.doPOWForMyV2Pubkey(data)
elif command == 'sendOutOrStoreMyV3Pubkey':
self.sendOutOrStoreMyV3Pubkey(data)
elif command == 'sendOutOrStoreMyV4Pubkey':
self.sendOutOrStoreMyV4Pubkey(data)
else:
with shared.printLock:
sys.stderr.write(
'Probable programming error: The command sent to the workerThread is weird. It is: %s\n' % command)
shared.workerQueue.task_done()
def doPOWForMyV2Pubkey(self, hash): # This function also broadcasts out the pubkey message once it is done with the POW
# Look up my stream number based on my address hash
"""configSections = shared.config.sections()
for addressInKeysFile in configSections:
if addressInKeysFile <> 'bitmessagesettings':
status,addressVersionNumber,streamNumber,hashFromThisParticularAddress = decodeAddress(addressInKeysFile)
if hash == hashFromThisParticularAddress:
myAddress = addressInKeysFile
break"""
myAddress = shared.myAddressesByHash[hash]
status, addressVersionNumber, streamNumber, hash = decodeAddress(
myAddress)
TTL = 28 * 24 * 60 * 60 # 28 days
embeddedTime = int(time.time() + random.randrange(-300, 300) + TTL) # 28 days from now plus or minus five minutes
payload = pack('>Q', (embeddedTime))
payload += '\x00\x00\x00\x01' # object type: pubkey
payload += encodeVarint(addressVersionNumber) # Address version number
payload += encodeVarint(streamNumber)
payload += '\x00\x00\x00\x01' # bitfield of features supported by me (see the wiki).
try:
privSigningKeyBase58 = shared.config.get(
myAddress, 'privsigningkey')
privEncryptionKeyBase58 = shared.config.get(
myAddress, 'privencryptionkey')
except Exception as err:
with shared.printLock:
sys.stderr.write(
'Error within doPOWForMyV2Pubkey. Could not read the keys from the keys.dat file for a requested address. %s\n' % err)
return
privSigningKeyHex = shared.decodeWalletImportFormat(
privSigningKeyBase58).encode('hex')
privEncryptionKeyHex = shared.decodeWalletImportFormat(
privEncryptionKeyBase58).encode('hex')
pubSigningKey = highlevelcrypto.privToPub(
privSigningKeyHex).decode('hex')
pubEncryptionKey = highlevelcrypto.privToPub(
privEncryptionKeyHex).decode('hex')
payload += pubSigningKey[1:]
payload += pubEncryptionKey[1:]
# Do the POW for this pubkey message
TTL = 2.5 * 24 * 60 * 60 # 2.5 days for now; user specifyable later.
target = 2 ** 64 / (shared.networkDefaultProofOfWorkNonceTrialsPerByte*(len(payload) + 8 + shared.networkDefaultPayloadLengthExtraBytes + ((TTL*(len(payload)+8+shared.networkDefaultPayloadLengthExtraBytes))/(2 ** 16))))
print '(For pubkey message) Doing proof of work...'
initialHash = hashlib.sha512(payload).digest()
trialValue, nonce = proofofwork.run(target, initialHash)
print '(For pubkey message) Found proof of work', trialValue, 'Nonce:', nonce
payload = pack('>Q', nonce) + payload
inventoryHash = calculateInventoryHash(payload)
objectType = 1
shared.inventory[inventoryHash] = (
objectType, streamNumber, payload, embeddedTime,'')
shared.inventorySets[streamNumber].add(inventoryHash)
with shared.printLock:
print 'broadcasting inv with hash:', inventoryHash.encode('hex')
shared.broadcastToSendDataQueues((
streamNumber, 'advertiseobject', inventoryHash))
shared.UISignalQueue.put(('updateStatusBar', ''))
9 years ago
try:
shared.config.set(
myAddress, 'lastpubkeysendtime', str(int(time.time())))
with open(shared.appdata + 'keys.dat', 'wb') as configfile:
shared.config.write(configfile)
except:
# The user deleted the address out of the keys.dat file before this
# finished.
pass
# If this isn't a chan address, this function assembles the pubkey data,
# does the necessary POW and sends it out. If it *is* a chan then it
# assembles the pubkey and stores is in the pubkey table so that we can
# send messages to "ourselves".
def sendOutOrStoreMyV3Pubkey(self, hash):
9 years ago
try:
myAddress = shared.myAddressesByHash[hash]
except:
#The address has been deleted.
return
if shared.safeConfigGetBoolean(myAddress, 'chan'):
with shared.printLock:
print 'This is a chan address. Not sending pubkey.'
return
status, addressVersionNumber, streamNumber, hash = decodeAddress(
myAddress)
TTL = 28 * 24 * 60 * 60 # 28 days
embeddedTime = int(time.time() + random.randrange(-300, 300) + TTL) # 28 days from now plus or minus five minutes
signedTimeForProtocolV2 = embeddedTime - TTL
"""
According to the protocol specification, the expiresTime along with the pubkey information is
signed. But to be backwards compatible during the upgrade period, we shall sign not the
expiresTime but rather the current time. There must be precisely a 28 day difference
between the two. After the upgrade period we'll switch to signing the whole payload with the
expiresTime time.
"""
payload = pack('>Q', (embeddedTime))
payload += '\x00\x00\x00\x01' # object type: pubkey
payload += encodeVarint(addressVersionNumber) # Address version number
payload += encodeVarint(streamNumber)
payload += '\x00\x00\x00\x01' # bitfield of features supported by me (see the wiki).
try:
privSigningKeyBase58 = shared.config.get(
myAddress, 'privsigningkey')
privEncryptionKeyBase58 = shared.config.get(
myAddress, 'privencryptionkey')
except Exception as err:
with shared.printLock:
sys.stderr.write(
'Error within sendOutOrStoreMyV3Pubkey. Could not read the keys from the keys.dat file for a requested address. %s\n' % err)
return
privSigningKeyHex = shared.decodeWalletImportFormat(
privSigningKeyBase58).encode('hex')
privEncryptionKeyHex = shared.decodeWalletImportFormat(
privEncryptionKeyBase58).encode('hex')
pubSigningKey = highlevelcrypto.privToPub(
privSigningKeyHex).decode('hex')
pubEncryptionKey = highlevelcrypto.privToPub(
privEncryptionKeyHex).decode('hex')
payload += pubSigningKey[1:]
payload += pubEncryptionKey[1:]
payload += encodeVarint(shared.config.getint(
myAddress, 'noncetrialsperbyte'))
payload += encodeVarint(shared.config.getint(
myAddress, 'payloadlengthextrabytes'))
if int(time.time()) < 1416175200: # Sun, 16 Nov 2014 22:00:00 GMT
signedData = pack('>Q', signedTimeForProtocolV2) + payload[12:]
else:
signedData = payload
signature = highlevelcrypto.sign(signedData, privSigningKeyHex)
payload += encodeVarint(len(signature))
payload += signature
# Do the POW for this pubkey message
target = 2 ** 64 / (shared.networkDefaultProofOfWorkNonceTrialsPerByte*(len(payload) + 8 + shared.networkDefaultPayloadLengthExtraBytes + ((TTL*(len(payload)+8+shared.networkDefaultPayloadLengthExtraBytes))/(2 ** 16))))
print '(For pubkey message) Doing proof of work...'
initialHash = hashlib.sha512(payload).digest()
trialValue, nonce = proofofwork.run(target, initialHash)
print '(For pubkey message) Found proof of work', trialValue, 'Nonce:', nonce
payload = pack('>Q', nonce) + payload
inventoryHash = calculateInventoryHash(payload)
objectType = 1
shared.inventory[inventoryHash] = (
objectType, streamNumber, payload, embeddedTime,'')
shared.inventorySets[streamNumber].add(inventoryHash)
with shared.printLock:
print 'broadcasting inv with hash:', inventoryHash.encode('hex')
shared.broadcastToSendDataQueues((
streamNumber, 'advertiseobject', inventoryHash))
shared.UISignalQueue.put(('updateStatusBar', ''))
9 years ago
try:
shared.config.set(
myAddress, 'lastpubkeysendtime', str(int(time.time())))
with open(shared.appdata + 'keys.dat', 'wb') as configfile:
shared.config.write(configfile)
except:
# The user deleted the address out of the keys.dat file before this
# finished.
pass
# If this isn't a chan address, this function assembles the pubkey data,
# does the necessary POW and sends it out.
def sendOutOrStoreMyV4Pubkey(self, myAddress):
9 years ago
if not shared.config.has_section(myAddress):
#The address has been deleted.
return
if shared.safeConfigGetBoolean(myAddress, 'chan'):
with shared.printLock:
print 'This is a chan address. Not sending pubkey.'
return
status, addressVersionNumber, streamNumber, hash = decodeAddress(
myAddress)
TTL = 28 * 24 * 60 * 60 # 28 days
embeddedTime = int(time.time() + random.randrange(-300, 300) + TTL) # 28 days from now plus or minus five minutes
payload = pack('>Q', (embeddedTime))
payload += '\x00\x00\x00\x01' # object type: pubkey
payload += encodeVarint(addressVersionNumber) # Address version number
payload += encodeVarint(streamNumber)
dataToEncrypt = '\x00\x00\x00\x01' # bitfield of features supported by me (see the wiki).
try:
privSigningKeyBase58 = shared.config.get(
myAddress, 'privsigningkey')
privEncryptionKeyBase58 = shared.config.get(
myAddress, 'privencryptionkey')
except Exception as err:
with shared.printLock:
sys.stderr.write(
'Error within sendOutOrStoreMyV4Pubkey. Could not read the keys from the keys.dat file for a requested address. %s\n' % err)
return
privSigningKeyHex = shared.decodeWalletImportFormat(
privSigningKeyBase58).encode('hex')
privEncryptionKeyHex = shared.decodeWalletImportFormat(
privEncryptionKeyBase58).encode('hex')
pubSigningKey = highlevelcrypto.privToPub(
privSigningKeyHex).decode('hex')
pubEncryptionKey = highlevelcrypto.privToPub(
privEncryptionKeyHex).decode('hex')
dataToEncrypt += pubSigningKey[1:]
dataToEncrypt += pubEncryptionKey[1:]
dataToEncrypt += encodeVarint(shared.config.getint(
myAddress, 'noncetrialsperbyte'))
dataToEncrypt += encodeVarint(shared.config.getint(
myAddress, 'payloadlengthextrabytes'))
# When we encrypt, we'll use a hash of the data
# contained in an address as a decryption key. This way in order to
# read the public keys in a pubkey message, a node must know the address
# first. We'll also tag, unencrypted, the pubkey with part of the hash
# so that nodes know which pubkey object to try to decrypt when they
# want to send a message.
doubleHashOfAddressData = hashlib.sha512(hashlib.sha512(encodeVarint(
addressVersionNumber) + encodeVarint(streamNumber) + hash).digest()).digest()
payload += doubleHashOfAddressData[32:] # the tag
"""
According to the protocol specification, the expiresTime along with the pubkey information is
signed. But to be backwards compatible during the upgrade period, we shall sign not the
expiresTime but rather the current time. There must be precisely a 28 day difference
between the two. After the upgrade period we'll switch to signing the whole payload from
above appended with dataToEncrypt.
"""
if int(time.time()) < 1416175200: # Sun, 16 Nov 2014 22:00:00 GMT
dataToSign = pack('>Q', (embeddedTime - TTL))
dataToSign += encodeVarint(addressVersionNumber) # Address version number
dataToSign += encodeVarint(streamNumber)
dataToSign += dataToEncrypt
else:
dataToSign = payload + dataToEncrypt
signature = highlevelcrypto.sign(dataToSign, privSigningKeyHex)
dataToEncrypt += encodeVarint(len(signature))
dataToEncrypt += signature
privEncryptionKey = doubleHashOfAddressData[:32]
pubEncryptionKey = highlevelcrypto.pointMult(privEncryptionKey)
payload += highlevelcrypto.encrypt(
dataToEncrypt, pubEncryptionKey.encode('hex'))
# Do the POW for this pubkey message
target = 2 ** 64 / (shared.networkDefaultProofOfWorkNonceTrialsPerByte*(len(payload) + 8 + shared.networkDefaultPayloadLengthExtraBytes + ((TTL*(len(payload)+8+shared.networkDefaultPayloadLengthExtraBytes))/(2 ** 16))))
print '(For pubkey message) Doing proof of work...'
initialHash = hashlib.sha512(payload).digest()
trialValue, nonce = proofofwork.run(target, initialHash)
print '(For pubkey message) Found proof of work', trialValue, 'Nonce:', nonce
payload = pack('>Q', nonce) + payload
inventoryHash = calculateInventoryHash(payload)
objectType = 1
shared.inventory[inventoryHash] = (
objectType, streamNumber, payload, embeddedTime, doubleHashOfAddressData[32:])
shared.inventorySets[streamNumber].add(inventoryHash)
with shared.printLock:
print 'broadcasting inv with hash:', inventoryHash.encode('hex')
shared.broadcastToSendDataQueues((
streamNumber, 'advertiseobject', inventoryHash))
shared.UISignalQueue.put(('updateStatusBar', ''))
try:
shared.config.set(
myAddress, 'lastpubkeysendtime', str(int(time.time())))
with open(shared.appdata + 'keys.dat', 'wb') as configfile:
shared.config.write(configfile)
except Exception as err:
logger.error('Error: Couldn\'t add the lastpubkeysendtime to the keys.dat file. Error message: %s' % err)
def sendBroadcast(self):
queryreturn = sqlQuery(
'''SELECT fromaddress, subject, message, ackdata FROM sent WHERE status=? and folder='sent' ''', 'broadcastqueued')
for row in queryreturn:
fromaddress, subject, body, ackdata = row
status, addressVersionNumber, streamNumber, ripe = decodeAddress(
fromaddress)
if addressVersionNumber <= 1:
with shared.printLock:
sys.stderr.write(
'Error: In the singleWorker thread, the sendBroadcast function doesn\'t understand the address version.\n')
return
# We need to convert our private keys to public keys in order
# to include them.
try:
privSigningKeyBase58 = shared.config.get(
fromaddress, 'privsigningkey')
privEncryptionKeyBase58 = shared.config.get(
fromaddress, 'privencryptionkey')
except:
shared.UISignalQueue.put(('updateSentItemStatusByAckdata', (
ackdata, tr.translateText("MainWindow", "Error! Could not find sender address (your address) in the keys.dat file."))))
continue
privSigningKeyHex = shared.decodeWalletImportFormat(
privSigningKeyBase58).encode('hex')
privEncryptionKeyHex = shared.decodeWalletImportFormat(
privEncryptionKeyBase58).encode('hex')
pubSigningKey = highlevelcrypto.privToPub(privSigningKeyHex).decode(
'hex') # At this time these pubkeys are 65 bytes long because they include the encoding byte which we won't be sending in the broadcast message.
pubEncryptionKey = highlevelcrypto.privToPub(
privEncryptionKeyHex).decode('hex')
TTL = 2.5 * 24 * 60 * 60 # 2.5 days
embeddedTime = int(time.time() + random.randrange(-300, 300) + TTL)
payload = pack('>Q', embeddedTime)
payload += '\x00\x00\x00\x03' # object type: broadcast
if int(time.time()) < 1416175200: # Before Sun, 16 Nov 2014 22:00:00 GMT
if addressVersionNumber <= 3:
payload += encodeVarint(2) # broadcast version
else:
payload += encodeVarint(3) # broadcast version
else: # After Sun, 16 Nov 2014 22:00:00 GMT
if addressVersionNumber <= 3:
payload += encodeVarint(4) # broadcast version
else:
payload += encodeVarint(5) # broadcast version
payload += encodeVarint(streamNumber)
if addressVersionNumber >= 4:
doubleHashOfAddressData = hashlib.sha512(hashlib.sha512(encodeVarint(
addressVersionNumber) + encodeVarint(streamNumber) + ripe).digest()).digest()
tag = doubleHashOfAddressData[32:]
payload += tag
else:
tag = ''
dataToEncrypt = ""
# the broadcast version is not included here after the end of the protocol v3 upgrade period
if int(time.time()) < 1416175200: # Sun, 16 Nov 2014 22:00:00 GMT
if addressVersionNumber <= 3:
dataToEncrypt += encodeVarint(2) # broadcast version
else:
dataToEncrypt += encodeVarint(3) # broadcast version
dataToEncrypt += encodeVarint(addressVersionNumber)
dataToEncrypt += encodeVarint(streamNumber)
dataToEncrypt += '\x00\x00\x00\x01' # behavior bitfield
dataToEncrypt += pubSigningKey[1:]
dataToEncrypt += pubEncryptionKey[1:]
if addressVersionNumber >= 3:
dataToEncrypt += encodeVarint(shared.config.getint(fromaddress,'noncetrialsperbyte'))
dataToEncrypt += encodeVarint(shared.config.getint(fromaddress,'payloadlengthextrabytes'))
dataToEncrypt += '\x02' # message encoding type
dataToEncrypt += encodeVarint(len('Subject:' + subject + '\n' + 'Body:' + body)) #Type 2 is simple UTF-8 message encoding per the documentation on the wiki.
dataToEncrypt += 'Subject:' + subject + '\n' + 'Body:' + body
if int(time.time()) < 1416175200: # Sun, 16 Nov 2014 22:00:00 GMT
dataToSign = dataToEncrypt
else:
dataToSign = payload + dataToEncrypt
signature = highlevelcrypto.sign(
dataToSign, privSigningKeyHex)
dataToEncrypt += encodeVarint(len(signature))
dataToEncrypt += signature
# Encrypt the broadcast with the information contained in the broadcaster's address. Anyone who knows the address can generate
# the private encryption key to decrypt the broadcast. This provides virtually no privacy; its purpose is to keep questionable
# and illegal content from flowing through the Internet connections and being stored on the disk of 3rd parties.
if addressVersionNumber <= 3:
privEncryptionKey = hashlib.sha512(encodeVarint(
addressVersionNumber) + encodeVarint(streamNumber) + ripe).digest()[:32]
else:
privEncryptionKey = doubleHashOfAddressData[:32]
pubEncryptionKey = highlevelcrypto.pointMult(privEncryptionKey)
payload += highlevelcrypto.encrypt(
dataToEncrypt, pubEncryptionKey.encode('hex'))
TTL = 2.5 * 24 * 60 * 60 # 2.5 days for now; user specifyable later.
target = 2 ** 64 / (shared.networkDefaultProofOfWorkNonceTrialsPerByte*(len(payload) + 8 + shared.networkDefaultPayloadLengthExtraBytes + ((TTL*(len(payload)+8+shared.networkDefaultPayloadLengthExtraBytes))/(2 ** 16))))
print '(For broadcast message) Doing proof of work...'
shared.UISignalQueue.put(('updateSentItemStatusByAckdata', (
ackdata, tr.translateText("MainWindow", "Doing work necessary to send broadcast..."))))
initialHash = hashlib.sha512(payload).digest()
trialValue, nonce = proofofwork.run(target, initialHash)
print '(For broadcast message) Found proof of work', trialValue, 'Nonce:', nonce
payload = pack('>Q', nonce) + payload
# Sanity check. The payload size should never be larger than 256 KiB. There should
# be checks elsewhere in the code to not let the user try to send a message this large
# until we implement message continuation.
if len(payload) > 2 ** 18: # 256 KiB
logger.critical('This broadcast object is too large to send. This should never happen. Object size: %s' % len(payload))
continue
inventoryHash = calculateInventoryHash(payload)
objectType = 3
shared.inventory[inventoryHash] = (
objectType, streamNumber, payload, embeddedTime, tag)
shared.inventorySets[streamNumber].add(inventoryHash)
with shared.printLock:
print 'sending inv (within sendBroadcast function) for object:', inventoryHash.encode('hex')
shared.broadcastToSendDataQueues((
streamNumber, 'advertiseobject', inventoryHash))
shared.UISignalQueue.put(('updateSentItemStatusByAckdata', (ackdata, tr.translateText("MainWindow", "Broadcast sent on %1").arg(l10n.formatTimestamp()))))
# Update the status of the message in the 'sent' table to have
# a 'broadcastsent' status
sqlExecute(
'UPDATE sent SET msgid=?, status=?, lastactiontime=? WHERE ackdata=?',
inventoryHash,
'broadcastsent',
int(time.time()),
ackdata)
def sendMsg(self):
while True: # while we have a msg that needs some work
# Select just one msg that needs work. We'll get a msg
# which is ready to be sent or a msg which we have sent in
# the last 28 days which were previously marked
# as 'toodifficult'. If the user has raised the maximum acceptable
# difficulty then those msgs may now be sendable.
queryreturn = sqlQuery(
'''SELECT toaddress, toripe, fromaddress, subject, message, ackdata, status FROM sent WHERE (status='msgqueued' or status='doingmsgpow' or status='forcepow' or (status='toodifficult' and lastactiontime>?)) and folder='sent' LIMIT 1''',
int(time.time()) - 2419200)
if len(queryreturn) == 0: # if there is no work to do then
break # break out of this sendMsg loop and
# wait for something to get put in the shared.workerQueue.
row = queryreturn[0]
toaddress, toripe, fromaddress, subject, message, ackdata, status = row
toStatus, toAddressVersionNumber, toStreamNumber, toRipe = decodeAddress(
toaddress)
fromStatus, fromAddressVersionNumber, fromStreamNumber, fromRipe = decodeAddress(
fromaddress)
# We may or may not already have the pubkey for this toAddress. Let's check.
if status == 'forcepow':
# if the status of this msg is 'forcepow' then clearly we have the pubkey already
# because the user could not have overridden the message about the POW being
# too difficult without knowing the required difficulty.
pass
# If we are sending a message to ourselves or a chan then we won't need an entry in the pubkeys table; we can calculate the needed pubkey using the private keys in our keys.dat file.
elif shared.config.has_section(toaddress):
sqlExecute(
'''UPDATE sent SET status='doingmsgpow' WHERE toaddress=? AND status='msgqueued' ''',
toaddress)
status='doingmsgpow'
else:
# Let's see if we already have the pubkey in our pubkeys table
queryreturn = sqlQuery(
'''SELECT hash FROM pubkeys WHERE hash=? AND addressversion=?''', toRipe, toAddressVersionNumber)
if queryreturn != []: # If we have the needed pubkey in the pubkey table already,
# set the status of this msg to doingmsgpow
sqlExecute(
'''UPDATE sent SET status='doingmsgpow' WHERE toaddress=? AND status='msgqueued' ''',
toaddress)
status = 'doingmsgpow'
# mark the pubkey as 'usedpersonally' so that we don't delete it later
sqlExecute(
'''UPDATE pubkeys SET usedpersonally='yes' WHERE hash=? and addressversion=?''',
toRipe,
toAddressVersionNumber)
else: # We don't have the needed pubkey in the pubkeys table already.
if toAddressVersionNumber <= 3:
toTag = ''
else:
toTag = hashlib.sha512(hashlib.sha512(encodeVarint(toAddressVersionNumber)+encodeVarint(toStreamNumber)+toRipe).digest()).digest()[32:]
if toRipe in shared.neededPubkeys or toTag in shared.neededPubkeys:
# We already sent a request for the pubkey
sqlExecute(
'''UPDATE sent SET status='awaitingpubkey' WHERE toaddress=? AND status='msgqueued' ''', toaddress)
shared.UISignalQueue.put(('updateSentItemStatusByHash', (
toRipe, tr.translateText("MainWindow",'Encryption key was requested earlier.'))))
continue #on with the next msg on which we can do some work
else:
# We have not yet sent a request for the pubkey
needToRequestPubkey = True
if toAddressVersionNumber >= 4: # If we are trying to send to address version >= 4 then
# the needed pubkey might be encrypted in the inventory.
# If we have it we'll need to decrypt it and put it in
# the pubkeys table.
# The decryptAndCheckPubkeyPayload function expects that the shared.neededPubkeys
# dictionary already contains the toAddress and cryptor object associated with
# the tag for this toAddress.
doubleHashOfToAddressData = hashlib.sha512(hashlib.sha512(encodeVarint(
toAddressVersionNumber) + encodeVarint(toStreamNumber) + toRipe).digest()).digest()
privEncryptionKey = doubleHashOfToAddressData[:32] # The first half of the sha512 hash.
tag = doubleHashOfToAddressData[32:] # The second half of the sha512 hash.
shared.neededPubkeys[tag] = (toaddress, highlevelcrypto.makeCryptor(privEncryptionKey.encode('hex')))
queryreturn = sqlQuery(
'''SELECT payload FROM inventory WHERE objecttype=1 and tag=? ''', toTag)
if queryreturn != []: # if there are any pubkeys in our inventory with the correct tag..
for row in queryreturn:
payload, = row
if shared.decryptAndCheckPubkeyPayload(payload, toaddress) == 'successful':
needToRequestPubkey = False
sqlExecute(
'''UPDATE sent SET status='doingmsgpow' WHERE toaddress=? AND (status='msgqueued' or status='awaitingpubkey' or status='doingpubkeypow')''',
toaddress)
del shared.neededPubkeys[tag]
continue # We'll start back at the beginning, pick up this msg, mark the pubkey as 'usedpersonally', and then send the msg.
#else: # There was something wrong with this pubkey object even
# though it had the correct tag- almost certainly because
# of malicious behavior or a badly programmed client. If
# there are any other pubkeys in our inventory with the correct
# tag then we'll try to decrypt those.
if needToRequestPubkey: # Obviously we had no success looking in the sql inventory. Let's look through the memory inventory.
with shared.inventoryLock:
for hash, storedValue in shared.inventory.items():
objectType, streamNumber, payload, expiresTime, tag = storedValue
if objectType == 1 and tag == toTag:
if shared.decryptAndCheckPubkeyPayload(payload, toaddress) == 'successful': #if valid, this function also puts it in the pubkeys table.
needToRequestPubkey = False
sqlExecute(
'''UPDATE sent SET status='doingmsgpow' WHERE toaddress=? AND (status='msgqueued' or status='awaitingpubkey' or status='doingpubkeypow')''',
toaddress)
del shared.neededPubkeys[tag]
continue # We'll start back at the beginning, pick up this msg, mark the pubkey as 'usedpersonally', and then send the msg.
if needToRequestPubkey:
sqlExecute(
'''UPDATE sent SET status='doingpubkeypow' WHERE toaddress=? AND status='msgqueued' ''',
toaddress)
shared.UISignalQueue.put(('updateSentItemStatusByHash', (
toRipe, tr.translateText("MainWindow",'Sending a request for the recipient\'s encryption key.'))))
self.requestPubKey(toaddress)
continue #on with the next msg on which we can do some work
# At this point we know that we have the necessary pubkey in the pubkeys table.
TTL = 2.5 * 24 * 60 * 60 # 2.5 days
embeddedTime = int(time.time() + random.randrange(-300, 300) + TTL) # 2.5 days from now plus or minus five minutes
if not shared.config.has_section(toaddress): # if we aren't sending this to ourselves or a chan
shared.ackdataForWhichImWatching[ackdata] = 0
shared.UISignalQueue.put(('updateSentItemStatusByAckdata', (
ackdata, tr.translateText("MainWindow", "Looking up the receiver\'s public key"))))
with shared.printLock:
print 'Sending a message. First 150 characters of message:', repr(message[:150])
# Let us fetch the recipient's public key out of our database. If
# the required proof of work difficulty is too hard then we'll
# abort.
queryreturn = sqlQuery(
'SELECT transmitdata FROM pubkeys WHERE hash=? and addressversion=?',
toRipe,
toAddressVersionNumber)
for row in queryreturn:
pubkeyPayload, = row
# The pubkey message is stored the way we originally received it
# under protocol version 2
# which means that we need to read beyond things like the nonce and
# time to get to the actual public keys.
if toAddressVersionNumber <= 3:
readPosition = 8 # to bypass the nonce
elif toAddressVersionNumber >= 4:
readPosition = 0 # the nonce is not included here so we don't need to skip over it.
pubkeyEmbeddedTime, = unpack(
'>I', pubkeyPayload[readPosition:readPosition + 4])
# This section is used for the transition from 32 bit time to 64
# bit time in the protocol.
if pubkeyEmbeddedTime == 0:
pubkeyEmbeddedTime, = unpack(
'>Q', pubkeyPayload[readPosition:readPosition + 8])
readPosition += 8
else:
readPosition += 4
readPosition += 1 # to bypass the address version whose length is definitely 1
streamNumber, streamNumberLength = decodeVarint(
pubkeyPayload[readPosition:readPosition + 10])
readPosition += streamNumberLength
behaviorBitfield = pubkeyPayload[readPosition:readPosition + 4]
# Mobile users may ask us to include their address's RIPE hash on a message
# unencrypted. Before we actually do it the sending human must check a box
# in the settings menu to allow it.
if shared.isBitSetWithinBitfield(behaviorBitfield,30): # if receiver is a mobile device who expects that their address RIPE is included unencrypted on the front of the message..
if not shared.safeConfigGetBoolean('bitmessagesettings','willinglysendtomobile'): # if we are Not willing to include the receiver's RIPE hash on the message..
logger.info('The receiver is a mobile user but the sender (you) has not selected that you are willing to send to mobiles. Aborting send.')
shared.UISignalQueue.put(('updateSentItemStatusByAckdata',(ackdata,tr.translateText("MainWindow",'Problem: Destination is a mobile device who requests that the destination be included in the message but this is disallowed in your settings. %1').arg(l10n.formatTimestamp()))))
# if the human changes their setting and then sends another message or restarts their client, this one will send at that time.
continue
readPosition += 4 # to bypass the bitfield of behaviors
# pubSigningKeyBase256 =
# pubkeyPayload[readPosition:readPosition+64] #We don't use this
# key for anything here.
readPosition += 64
pubEncryptionKeyBase256 = pubkeyPayload[
readPosition:readPosition + 64]
readPosition += 64
# Let us fetch the amount of work required by the recipient.
if toAddressVersionNumber == 2:
requiredAverageProofOfWorkNonceTrialsPerByte = shared.networkDefaultProofOfWorkNonceTrialsPerByte
requiredPayloadLengthExtraBytes = shared.networkDefaultPayloadLengthExtraBytes
shared.UISignalQueue.put(('updateSentItemStatusByAckdata', (
ackdata, tr.translateText("MainWindow", "Doing work necessary to send message.\nThere is no required difficulty for version 2 addresses like this."))))
elif toAddressVersionNumber >= 3:
requiredAverageProofOfWorkNonceTrialsPerByte, varintLength = decodeVarint(
pubkeyPayload[readPosition:readPosition + 10])
readPosition += varintLength
requiredPayloadLengthExtraBytes, varintLength = decodeVarint(
pubkeyPayload[readPosition:readPosition + 10])
readPosition += varintLength
if requiredAverageProofOfWorkNonceTrialsPerByte < shared.networkDefaultProofOfWorkNonceTrialsPerByte: # We still have to meet a minimum POW difficulty regardless of what they say is allowed in order to get our message to propagate through the network.
requiredAverageProofOfWorkNonceTrialsPerByte = shared.networkDefaultProofOfWorkNonceTrialsPerByte
if requiredPayloadLengthExtraBytes < shared.networkDefaultPayloadLengthExtraBytes:
requiredPayloadLengthExtraBytes = shared.networkDefaultPayloadLengthExtraBytes
logger.debug('Using averageProofOfWorkNonceTrialsPerByte: %s and payloadLengthExtraBytes: %s.' % (requiredAverageProofOfWorkNonceTrialsPerByte, requiredPayloadLengthExtraBytes))
shared.UISignalQueue.put(('updateSentItemStatusByAckdata', (ackdata, tr.translateText("MainWindow", "Doing work necessary to send message.\nReceiver\'s required difficulty: %1 and %2").arg(str(float(
requiredAverageProofOfWorkNonceTrialsPerByte) / shared.networkDefaultProofOfWorkNonceTrialsPerByte)).arg(str(float(requiredPayloadLengthExtraBytes) / shared.networkDefaultPayloadLengthExtraBytes)))))
if status != 'forcepow':
if (requiredAverageProofOfWorkNonceTrialsPerByte > shared.config.getint('bitmessagesettings', 'maxacceptablenoncetrialsperbyte') and shared.config.getint('bitmessagesettings', 'maxacceptablenoncetrialsperbyte') != 0) or (requiredPayloadLengthExtraBytes > shared.config.getint('bitmessagesettings', 'maxacceptablepayloadlengthextrabytes') and shared.config.getint('bitmessagesettings', 'maxacceptablepayloadlengthextrabytes') != 0):
# The demanded difficulty is more than we are willing
# to do.
sqlExecute(
'''UPDATE sent SET status='toodifficult' WHERE ackdata=? ''',
ackdata)
shared.UISignalQueue.put(('updateSentItemStatusByAckdata', (ackdata, tr.translateText("MainWindow", "Problem: The work demanded by the recipient (%1 and %2) is more difficult than you are willing to do.").arg(str(float(requiredAverageProofOfWorkNonceTrialsPerByte) / shared.networkDefaultProofOfWorkNonceTrialsPerByte)).arg(str(float(
requiredPayloadLengthExtraBytes) / shared.networkDefaultPayloadLengthExtraBytes)).arg(l10n.formatTimestamp()))))
continue
else: # if we are sending a message to ourselves or a chan..
with shared.printLock:
print 'Sending a message. First 150 characters of message:', repr(message[:150])
behaviorBitfield = '\x00\x00\x00\x01'
try:
privEncryptionKeyBase58 = shared.config.get(
toaddress, 'privencryptionkey')
except Exception as err:
shared.UISignalQueue.put(('updateSentItemStatusByAckdata',(ackdata,tr.translateText("MainWindow",'Problem: You are trying to send a message to yourself or a chan but your encryption key could not be found in the keys.dat file. Could not encrypt message. %1').arg(l10n.formatTimestamp()))))
with shared.printLock:
sys.stderr.write(
'Error within sendMsg. Could not read the keys from the keys.dat file for our own address. %s\n' % err)
continue
privEncryptionKeyHex = shared.decodeWalletImportFormat(
privEncryptionKeyBase58).encode('hex')
pubEncryptionKeyBase256 = highlevelcrypto.privToPub(
privEncryptionKeyHex).decode('hex')[1:]
requiredAverageProofOfWorkNonceTrialsPerByte = shared.networkDefaultProofOfWorkNonceTrialsPerByte
requiredPayloadLengthExtraBytes = shared.networkDefaultPayloadLengthExtraBytes
shared.UISignalQueue.put(('updateSentItemStatusByAckdata', (
ackdata, tr.translateText("MainWindow", "Doing work necessary to send message."))))
if fromAddressVersionNumber == 2:
payload = ""
if int(time.time()) < 1416175200: # Sun, 16 Nov 2014 22:00:00 GMT
payload += '\x01' # Message version.
payload += encodeVarint(fromAddressVersionNumber)
payload += encodeVarint(fromStreamNumber)
payload += '\x00\x00\x00\x01' # Bitfield of features and behaviors that can be expected from me. (See https://bitmessage.org/wiki/Protocol_specification#Pubkey_bitfield_features )
# We need to convert our private keys to public keys in order
# to include them.
try:
privSigningKeyBase58 = shared.config.get(
fromaddress, 'privsigningkey')
privEncryptionKeyBase58 = shared.config.get(
fromaddress, 'privencryptionkey')
except:
shared.UISignalQueue.put(('updateSentItemStatusByAckdata', (
ackdata, tr.translateText("MainWindow", "Error! Could not find sender address (your address) in the keys.dat file."))))
continue
privSigningKeyHex = shared.decodeWalletImportFormat(
privSigningKeyBase58).encode('hex')
privEncryptionKeyHex = shared.decodeWalletImportFormat(
privEncryptionKeyBase58).encode('hex')
pubSigningKey = highlevelcrypto.privToPub(
privSigningKeyHex).decode('hex')
pubEncryptionKey = highlevelcrypto.privToPub(
privEncryptionKeyHex).decode('hex')
payload += pubSigningKey[
1:] # The \x04 on the beginning of the public keys are not sent. This way there is only one acceptable way to encode and send a public key.
payload += pubEncryptionKey[1:]
payload += toRipe # This hash will be checked by the receiver of the message to verify that toRipe belongs to them. This prevents a Surreptitious Forwarding Attack.
payload += '\x02' # Type 2 is simple UTF-8 message encoding as specified on the Protocol Specification on the Bitmessage Wiki.
messageToTransmit = 'Subject:' + \
subject + '\n' + 'Body:' + message
payload += encodeVarint(len(messageToTransmit))
payload += messageToTransmit
fullAckPayload = self.generateFullAckMessage(
ackdata, toStreamNumber) # The fullAckPayload is a normal msg protocol message with the proof of work already completed that the receiver of this message can easily send out.
payload += encodeVarint(len(fullAckPayload))
payload += fullAckPayload
if int(time.time()) < 1416175200: # Sun, 16 Nov 2014 22:00:00 GMT
dataToSign = payload
else:
dataToSign = encodeVarint(1) + encodeVarint(toStreamNumber) + payload
signature = highlevelcrypto.sign(dataToSign, privSigningKeyHex)
payload += encodeVarint(len(signature))
payload += signature
if from