def getScryptPoW(hexData):
"""
Actual scrypt pow calculation
"""
data = binascii.unhexlify(hexData)
return auxpow.reverseHex(binascii.hexlify(ltc_scrypt.getPoWHash(data)))
def getScryptPoW(hexData): """ Actual scrypt pow calculation """ data = binascii.unhexlify(hexData) return auxpow.reverseHex(binascii.hexlify(ltc_scrypt.getPoWHash(data)))
def mineScryptAux(node, chainid, ok):
"""
Mine an auxpow block on the given RPC connection.
"""
auxblock = node.getauxblock()
target = auxpow.reverseHex(auxblock['_target'])
apow = computeAuxpowWithChainId(auxblock['hash'], target, chainid, ok)
res = node.getauxblock(auxblock['hash'], apow)
def mineScryptAux (node, chainid, ok): """ Mine an auxpow block on the given RPC connection. """ auxblock = node.getauxblock () target = auxpow.reverseHex (auxblock['target']) apow = computeAuxpowWithChainId (auxblock['hash'], target, chainid, ok) res = node.getauxblock (auxblock['hash'], apow)
def computeAuxpowWithChainId(block, target, chainid, ok):
"""
Build an auxpow object (serialised as hex string) that solves the
block, for a given chain id.
"""
# Start by building the merge-mining coinbase. The merkle tree
# consists only of the block hash as root.
coinbase = "fabe" + binascii.hexlify("m" * 2)
coinbase += block
coinbase += "01000000" + ("00" * 4)
# Construct "vector" of transaction inputs.
vin = "01"
vin += ("00" * 32) + ("ff" * 4)
vin += ("%02x" % (len(coinbase) / 2)) + coinbase
vin += ("ff" * 4)
# Build up the full coinbase transaction. It consists only
# of the input and has no outputs.
tx = "01000000" + vin + "00" + ("00" * 4)
txHash = auxpow.doubleHashHex(tx)
# Construct the parent block header. It need not be valid, just good
# enough for auxpow purposes.
header = "0100" + chainid + "00"
header += "00" * 32
header += auxpow.reverseHex(txHash)
header += "00" * 4
header += "00" * 4
header += "00" * 4
# Mine the block.
(header, blockhash) = mineScryptBlock(header, target, ok)
# Build the MerkleTx part of the auxpow.
output = tx
output += blockhash
output += "00"
output += "00" * 4
# Extend to full auxpow.
output += "00"
output += "00" * 4
output += header
return output
def computeAuxpowWithChainId (block, target, chainid, ok):
"""
Build an auxpow object (serialised as hex string) that solves the
block, for a given chain id.
"""
# Start by building the merge-mining coinbase. The merkle tree
# consists only of the block hash as root.
coinbase = "fabe" + binascii.hexlify ("m" * 2)
coinbase += block
coinbase += "01000000" + ("00" * 4)
# Construct "vector" of transaction inputs.
vin = "01"
vin += ("00" * 32) + ("ff" * 4)
vin += ("%02x" % (len (coinbase) / 2)) + coinbase
vin += ("ff" * 4)
# Build up the full coinbase transaction. It consists only
# of the input and has no outputs.
tx = "01000000" + vin + "00" + ("00" * 4)
txHash = auxpow.doubleHashHex (tx)
# Construct the parent block header. It need not be valid, just good
# enough for auxpow purposes.
header = "0100" + chainid + "00"
header += "00" * 32
header += auxpow.reverseHex (txHash)
header += "00" * 4
header += "00" * 4
header += "00" * 4
# Mine the block.
(header, blockhash) = mineScryptBlock (header, target, ok)
# Build the MerkleTx part of the auxpow.
output = tx
output += blockhash
output += "00"
output += "00" * 4
# Extend to full auxpow.
output += "00"
output += "00" * 4
output += header
return output
def run_test (self):
BitcoinTestFramework.run_test (self)
# Generate a block so that we are not "downloading blocks".
self.nodes[0].setgenerate (True, 1)
# Compare basic data of getauxblock to getblocktemplate.
auxblock = self.nodes[0].getauxblock ()
blocktemplate = self.nodes[0].getblocktemplate ()
assert_equal (auxblock['coinbasevalue'], blocktemplate['coinbasevalue'])
assert_equal (auxblock['bits'], blocktemplate['bits'])
assert_equal (auxblock['height'], blocktemplate['height'])
assert_equal (auxblock['previousblockhash'], blocktemplate['previousblockhash'])
# Compare target and take byte order into account.
target = auxblock['_target']
reversedTarget = auxpow.reverseHex (target)
assert_equal (reversedTarget, blocktemplate['target'])
# Verify data that can be found in another way.
assert_equal (auxblock['chainid'], 1)
assert_equal (auxblock['height'], self.nodes[0].getblockcount () + 1)
assert_equal (auxblock['previousblockhash'], self.nodes[0].getblockhash (auxblock['height'] - 1))
# Calling again should give the same block.
auxblock2 = self.nodes[0].getauxblock ()
assert_equal (auxblock2, auxblock)
# If we receive a new block, the old hash will be replaced.
self.sync_all ()
self.nodes[1].setgenerate (True, 1)
self.sync_all ()
auxblock2 = self.nodes[0].getauxblock ()
assert auxblock['hash'] != auxblock2['hash']
try:
self.nodes[0].getauxblock (auxblock['hash'], "x")
raise AssertionError ("invalid block hash accepted")
except JSONRPCException as exc:
assert_equal (exc.error['code'], -8)
# Invalid format for auxpow.
try:
self.nodes[0].getauxblock (auxblock2['hash'], "x")
raise AssertionError ("malformed auxpow accepted")
except JSONRPCException as exc:
assert_equal (exc.error['code'], -1)
# Invalidate the block again, send a transaction and query for the
# auxblock to solve that contains the transaction.
self.nodes[0].setgenerate (True, 1)
addr = self.nodes[1].getnewaddress ()
txid = self.nodes[0].sendtoaddress (addr, 1)
self.sync_all ()
assert_equal (self.nodes[1].getrawmempool (), [txid])
auxblock = self.nodes[0].getauxblock ()
blocktemplate = self.nodes[0].getblocktemplate ()
target = blocktemplate['target']
# Compute invalid auxpow.
apow = auxpow.computeAuxpow (auxblock['hash'], target, False)
res = self.nodes[0].getauxblock (auxblock['hash'], apow)
assert not res
# Compute and submit valid auxpow.
apow = auxpow.computeAuxpow (auxblock['hash'], target, True)
res = self.nodes[0].getauxblock (auxblock['hash'], apow)
assert res
# Make sure that the block is indeed accepted.
self.sync_all ()
assert_equal (self.nodes[1].getrawmempool (), [])
height = self.nodes[1].getblockcount ()
assert_equal (height, auxblock['height'])
assert_equal (self.nodes[1].getblockhash (height), auxblock['hash'])
# Check that it paid correctly to the first node.
t = self.nodes[0].listtransactions ("", 1)
assert_equal (len (t), 1)
t = t[0]
assert_equal (t['category'], "immature")
assert_equal (t['blockhash'], auxblock['hash'])
assert t['generated']
assert t['amount'] >= Decimal ("25")
assert_equal (t['confirmations'], 1)
# Verify the coinbase script. Ensure that it includes the block height
# to make the coinbase tx unique. The expected block height is around
# 200, so that the serialisation of the CScriptNum ends in an extra 00.
# The vector has length 2, which makes up for 02XX00 as the serialised
# height. Check this.
blk = self.nodes[1].getblock (auxblock['hash'])
tx = self.nodes[1].getrawtransaction (blk['tx'][0], 1)
coinbase = tx['vin'][0]['coinbase']
assert_equal ("02%02x00" % auxblock['height'], coinbase[0 : 6])
