import hashlib # This function expects that pubkey begin with \x04 def calculateBitcoinAddressFromPubkey(pubkey): if len(pubkey) != 65: print 'Could not calculate Bitcoin address from pubkey because function was passed a pubkey that was', len(pubkey), 'bytes long rather than 65.' return "error" ripe = hashlib.new('ripemd160') sha = hashlib.new('sha256') sha.update(pubkey) ripe.update(sha.digest()) ripeWithProdnetPrefix = '\x00' + ripe.digest() checksum = hashlib.sha256(hashlib.sha256( ripeWithProdnetPrefix).digest()).digest()[:4] binaryBitcoinAddress = ripeWithProdnetPrefix + checksum numberOfZeroBytesOnBinaryBitcoinAddress = 0 while binaryBitcoinAddress[0] == '\x00': numberOfZeroBytesOnBinaryBitcoinAddress += 1 binaryBitcoinAddress = binaryBitcoinAddress[1:] base58encoded = arithmetic.changebase(binaryBitcoinAddress, 256, 58) return "1" * numberOfZeroBytesOnBinaryBitcoinAddress + base58encoded def calculateTestnetAddressFromPubkey(pubkey): if len(pubkey) != 65: print 'Could not calculate Bitcoin address from pubkey because function was passed a pubkey that was', len(pubkey), 'bytes long rather than 65.' return "error" ripe = hashlib.new('ripemd160') sha = hashlib.new('sha256') sha.update(pubkey) ripe.update(sha.digest()) ripeWithProdnetPrefix = '\x6F' + ripe.digest() checksum = hashlib.sha256(hashlib.sha256( ripeWithProdnetPrefix).digest()).digest()[:4] binaryBitcoinAddress = ripeWithProdnetPrefix + checksum numberOfZeroBytesOnBinaryBitcoinAddress = 0 while binaryBitcoinAddress[0] == '\x00': numberOfZeroBytesOnBinaryBitcoinAddress += 1 binaryBitcoinAddress = binaryBitcoinAddress[1:] base58encoded = arithmetic.changebase(binaryBitcoinAddress, 256, 58) return "1" * numberOfZeroBytesOnBinaryBitcoinAddress + base58encoded