def checkSig(self,binSig, binPubKey, txOutScript, txInTx, txInIndex, lastOpCodeSep=None):
"""
Generic method for checking Bitcoin tx signatures. This needs to be used for both
OP_CHECKSIG and OP_CHECKMULTISIG. Step 1 is to pop signature and public key off
the stack, which must be done outside this method and passed in through the argument
list. The remaining steps do not require access to the stack.
"""
# 2. Subscript is from latest OP_CODESEPARATOR until end... if DNE, use whole script
subscript = txOutScript
if lastOpCodeSep:
subscript = subscript[lastOpCodeSep:]
# 3. Signature is deleted from subscript
# I'm not sure why this line is necessary - maybe for non-standard scripts?
lengthInBinary = int_to_binary(len(binSig))
subscript = subscript.replace( lengthInBinary + binSig, "")
# 4. Hashtype is popped and stored
hashtype = binary_to_int(binSig[-1])
justSig = binSig[:-1]
if not hashtype == 1:
LOGERROR('Non-unity hashtypes not implemented yet! (hashtype = %d)', hashtype)
assert(False)
# 5. Make a copy of the transaction -- we will be hashing a modified version
txCopy = PyTx().unserialize( txInTx.serialize() )
# 6. Remove all OP_CODESEPARATORs
subscript.replace( int_to_binary(OP_CODESEPARATOR), '')
# 7. All the TxIn scripts in the copy are blanked (set to empty string)
for txin in txCopy.inputs:
txin.binScript = ''
# 8. Script for the current input in the copy is set to subscript
txCopy.inputs[txInIndex].binScript = subscript
# 9. Prepare the signature and public key
senderAddr = PyBtcAddress().createFromPublicKey(binPubKey)
binHashCode = int_to_binary(hashtype, widthBytes=4)
toHash = txCopy.serialize() + binHashCode
# Hashes are computed as part of CppBlockUtils::CryptoECDSA methods
##hashToVerify = hash256(toHash)
##hashToVerify = binary_switchEndian(hashToVerify)
# 10. Apply ECDSA signature verification
if senderAddr.verifyDERSignature(toHash, justSig):
return True
else:
return False
def testSimpleAddress(self):
# Execute the tests with Satoshi's public key from the Bitcoin specification page
satoshiPubKeyHex = '04fc9702847840aaf195de8442ebecedf5b095cdbb9bc716bda9110971b28a49e0ead8564ff0db22209e0374782c093bb899692d524e9d6a6956e7c5ecbcd68284'
addrPiece1Hex = '65a4358f4691660849d9f235eb05f11fabbd69fa'
addrPiece1Bin = hex_to_binary(addrPiece1Hex)
satoshiAddrStr = hash160_to_addrStr(addrPiece1Bin)
saddr = PyBtcAddress().createFromPublicKey( hex_to_binary(satoshiPubKeyHex) )
print '\tAddr calc from pubkey: ', saddr.calculateAddrStr()
self.assertTrue(checkAddrStrValid(satoshiAddrStr))
testAddr = PyBtcAddress().createFromPlainKeyData(PRIVATE_KEY, ADDRESS_20, publicKey65=PUBLIC_KEY)
msg = int_to_binary(39029348428)
theHash = hash256(msg)
derSig = testAddr.generateDERSignature(theHash)
# Testing ECDSA signing & verification -- arbitrary binary strings:
self.assertTrue(testAddr.verifyDERSignature( theHash, derSig))
def testSimpleAddress(self):
# Execute the tests with Satoshi's public key from the Bitcoin specification page
satoshiPubKeyHex = '04fc9702847840aaf195de8442ebecedf5b095cdbb9bc716bda9110971b28a49e0ead8564ff0db22209e0374782c093bb899692d524e9d6a6956e7c5ecbcd68284'
addrPiece1Hex = '65a4358f4691660849d9f235eb05f11fabbd69fa'
addrPiece1Bin = hex_to_binary(addrPiece1Hex)
satoshiAddrStr = hash160_to_addrStr(addrPiece1Bin)
saddr = PyBtcAddress().createFromPublicKey(
hex_to_binary(satoshiPubKeyHex))
print '\tAddr calc from pubkey: ', saddr.calculateAddrStr()
self.assertTrue(checkAddrStrValid(satoshiAddrStr))
testAddr = PyBtcAddress().createFromPlainKeyData(
PRIVATE_KEY, ADDRESS_20, publicKey65=PUBLIC_KEY)
msg = int_to_binary(39029348428)
theHash = hash256(msg)
derSig = testAddr.generateDERSignature(theHash)
# Testing ECDSA signing & verification -- arbitrary binary strings:
self.assertTrue(testAddr.verifyDERSignature(theHash, derSig))
