def decode(buffer):
decodedBuffer = b''
if len(buffer) > 0:
prefix = buffer[0]
if prefix >= BYTE_PREFIX_START and prefix <= BYTE_PREFIX_END:
decodedBuffer += DataType.intToBytes(prefix)
elif prefix >= STRING_PREFIX_START and prefix <= STRING_PREFIX_END:
offset = 1
decodedBufferLen = None
if prefix > STRING_55_LEN_MAX_RANGE:
prefixLen = prefix - STRING_55_LEN_MAX_RANGE
bufferLen = buffer[offset:offset + prefixLen]
decodedBufferLen = DataType.bytesToInt(bufferLen)
offset += prefixLen
else:
decodedBufferLen = prefix - STRING_PREFIX_START
decodedBuffer += buffer[offset:offset + decodedBufferLen]
elif prefix >= LIST_PREFIX_START and prefix <= LIST_PREFIX_END:
decodedBuffer = []
offset = 1
decodedBufferLen = None
if prefix > LIST_55_LEN_MAX_RANGE:
prefixLen = prefix - LIST_55_LEN_MAX_RANGE
bufferLen = buffer[offset:offset + prefixLen]
decodedBufferLen = DataType.bytesToInt(bufferLen)
offset += prefixLen
else:
decodedBufferLen = prefix - LIST_PREFIX_START
buffer = buffer[offset:offset + decodedBufferLen]
while len(buffer) > 0:
tempBufferDecoded = decode(buffer)
decodedBuffer.append(tempBufferDecoded)
offset = 1
prefix = buffer[0]
if prefix >= BYTE_PREFIX_START and prefix <= BYTE_PREFIX_END:
decodedBufferLen = 0
elif prefix >= STRING_PREFIX_START and prefix <= STRING_PREFIX_END:
if prefix > STRING_55_LEN_MAX_RANGE:
prefixLen = prefix - STRING_55_LEN_MAX_RANGE
bufferLen = buffer[offset:offset + prefixLen]
decodedBufferLen = DataType.bytesToInt(bufferLen)
offset += prefixLen
else:
decodedBufferLen = prefix - STRING_PREFIX_START
elif prefix >= LIST_PREFIX_START and prefix <= LIST_PREFIX_END:
if prefix > LIST_55_LEN_MAX_RANGE:
prefixLen = prefix - LIST_55_LEN_MAX_RANGE
bufferLen = buffer[offset:offset + prefixLen]
decodedBufferLen = DataType.bytesToInt(bufferLen)
offset += prefixLen
else:
decodedBufferLen = prefix - LIST_PREFIX_START
buffer = buffer[offset + decodedBufferLen:]
return decodedBuffer
def validateBlockBits(self, blockHeader, bits):
currTarget = Bits.getTargetFromBits(bits)
blockHeaderHash = Crypto.proofOfWorkHash(blockHeader)
blockHeaderHashLong = DataType.bytesToInt(blockHeaderHash)
if blockHeaderHashLong < currTarget:
return True
else:
return False
def checkmultisig(self):
outputHash = self.transaction.hashOutput(self.input, self.output)
threshold = DataType.bytesToInt(self.output.extraData)
match = 0
publicKeys = self.input.witness[::2]
multiSigAddressBytes = bytearray()
for publicKey in publicKeys:
multiSigAddressBytes.extend(publicKey)
multiSigAddress = Crypto.generateAddress(multiSigAddressBytes)
if multiSigAddress == self.output.address:
signatures = self.input.witness[1::2]
for public, signature in zip(publicKeys, signatures):
if Crypto.verify(public, signature, outputHash):
match += 1
self.stack.append(match >= threshold)
def popAsInt(self):
return DataType.bytesToInt(self.pop())