import rsa import hashlib from struct import * #There is another copy of this function in Bitmessagemain.py def convertIntToString(n): a = __builtins__.hex(n) if a[-1:] == 'L': a = a[:-1] if (len(a) % 2) == 0: return a[2:].decode('hex') else: return ('0'+a[2:]).decode('hex') ALPHABET = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz" def encodeBase58(num, alphabet=ALPHABET): """Encode a number in Base X `num`: The number to encode `alphabet`: The alphabet to use for encoding """ if (num == 0): return alphabet[0] arr = [] base = len(alphabet) while num: rem = num % base #print 'num is:', num num = num // base arr.append(alphabet[rem]) arr.reverse() return ''.join(arr) def decodeBase58(string, alphabet=ALPHABET): """Decode a Base X encoded string into the number Arguments: - `string`: The encoded string - `alphabet`: The alphabet to use for encoding """ base = len(alphabet) strlen = len(string) num = 0 try: power = strlen - 1 for char in string: num += alphabet.index(char) * (base ** power) power -= 1 except: #character not found (like a space character or a 0) return 0 return num def encodeVarint(integer): if integer < 0: print 'varint cannot be < 0' raise SystemExit if integer < 253: return pack('>B',integer) if integer >= 253 and integer < 65536: return pack('>B',253) + pack('>H',integer) if integer >= 65536 and integer < 4294967296: return pack('>B',254) + pack('>I',integer) if integer >= 4294967296 and integer < 18446744073709551616: return pack('>B',255) + pack('>Q',integer) if integer >= 18446744073709551616: print 'varint cannot be >= 18446744073709551616' raise SystemExit def decodeVarint(data): if len(data) == 0: return (0,0) firstByte, = unpack('>B',data[0:1]) if firstByte < 253: return (firstByte,1) #the 1 is the length of the varint if firstByte == 253: a, = unpack('>H',data[1:3]) return (a,3) if firstByte == 254: a, = unpack('>I',data[1:5]) return (a,5) if firstByte == 255: a, = unpack('>Q',data[1:9]) return (a,9) def calculateInventoryHash(data): sha = hashlib.new('sha512') sha2 = hashlib.new('sha512') sha.update(data) sha2.update(sha.digest()) return sha2.digest()[0:32] def encodeAddress(version,stream,ripe): a = encodeVarint(version) + encodeVarint(stream) + ripe sha = hashlib.new('sha512') sha.update(a) currentHash = sha.digest() #print 'sha after first hashing: ', sha.hexdigest() sha = hashlib.new('sha512') sha.update(currentHash) #print 'sha after second hashing: ', sha.hexdigest() checksum = sha.digest()[0:4] #print 'len(a) = ', len(a) #print 'checksum = ', checksum.encode('hex') #print 'len(checksum) = ', len(checksum) asInt = int(a.encode('hex') + checksum.encode('hex'),16) #asInt = int(checksum.encode('hex') + a.encode('hex'),16) # print asInt return 'BM-'+ encodeBase58(asInt) def decodeAddress(address): #returns (status, address version number, stream number, data (almost certainly a ripe hash)) #check for the BM- at the front of the address. If it isn't there, this address might be for a different version of Bitmessage if address[:3] != 'BM-': status = 'missingbm' return status,0,0,0 #take off the BM- integer = decodeBase58(address[3:]) if integer == 0: status = 'invalidcharacters' return status,0,0,0 #after converting to hex, the string will be prepended with a 0x and appended with a L hexdata = hex(integer)[2:-1] if len(hexdata) % 2 != 0: hexdata = '0' + hexdata #print 'hexdata', hexdata data = hexdata.decode('hex') checksum = data[-4:] sha = hashlib.new('sha512') sha.update(data[:-4]) currentHash = sha.digest() #print 'sha after first hashing: ', sha.hexdigest() sha = hashlib.new('sha512') sha.update(currentHash) #print 'sha after second hashing: ', sha.hexdigest() if checksum != sha.digest()[0:4]: print 'checksum failed' status = 'checksumfailed' return status,0,0,0 #else: # print 'checksum PASSED' addressVersionNumber, bytesUsedByVersionNumber = decodeVarint(data[:9]) #print 'addressVersionNumber', addressVersionNumber #print 'bytesUsedByVersionNumber', bytesUsedByVersionNumber if addressVersionNumber < 1: print 'cannot decode version address version numbers this high' status = 'versiontoohigh' return status,0,0,0 streamNumber, bytesUsedByStreamNumber = decodeVarint(data[bytesUsedByVersionNumber:10+bytesUsedByVersionNumber]) #print streamNumber status = 'success' return status,addressVersionNumber,streamNumber,data[-24:-4] def addressStream(address): #returns the stream number of an address or False if there is a problem with the address. #check for the BM- at the front of the address. If it isn't there, this address might be for a different version of Bitmessage if address[:3] != 'BM-': status = 'missingbm' return False #here we take off the BM- integer = decodeBase58(address[3:]) #after converting to hex, the string will be prepended with a 0x and appended with a L hexdata = hex(integer)[2:-1] if len(hexdata) % 2 != 0: hexdata = '0' + hexdata #print 'hexdata', hexdata data = hexdata.decode('hex') checksum = data[-4:] sha = hashlib.new('sha512') sha.update(data[:-4]) currentHash = sha.digest() #print 'sha after first hashing: ', sha.hexdigest() sha = hashlib.new('sha512') sha.update(currentHash) #print 'sha after second hashing: ', sha.hexdigest() if checksum != sha.digest()[0:4]: print 'checksum failed' status = 'checksumfailed' return False #else: # print 'checksum PASSED' addressVersionNumber, bytesUsedByVersionNumber = decodeVarint(data[:9]) #print 'addressVersionNumber', addressVersionNumber #print 'bytesUsedByVersionNumber', bytesUsedByVersionNumber if addressVersionNumber < 1: print 'cannot decode version address version numbers this high' status = 'versiontoohigh' return False streamNumber, bytesUsedByStreamNumber = decodeVarint(data[bytesUsedByVersionNumber:9+bytesUsedByVersionNumber]) #print streamNumber status = 'success' return streamNumber if __name__ == "__main__": #Let's make a new Bitmessage address: (pubkey, privkey) = rsa.newkeys(256) print privkey['n'] print privkey['e'] print privkey['d'] print privkey['p'] print privkey['q'] ripe = hashlib.new('ripemd160') sha = hashlib.new('sha512') sha.update(convertIntToString(pubkey.n)+convertIntToString(pubkey.e)) ripe.update(sha.digest()) #print 'sha digest:', sha.digest() #print 'ripe digest:', ripe.digest() #print len(sha.digest()) #print len(ripe.digest()) #prepend the version number and stream number a = '\x05' + '\x08' + ripe.digest() #print 'lengh of a at beginning = ', len(a) print 'This is the data to be encoded in the address: ', a.encode('hex') returnedAddress = encodeAddress(5,8,ripe.digest()) status,addressVersionNumber,streamNumber,data = decodeAddress(returnedAddress) print returnedAddress print 'Status:', status print 'addressVersionNumber', addressVersionNumber print 'streamNumber', streamNumber print 'length of data(the ripe hash):', len(data) print '\n\nNow let us try making an address with given 2048-bit n and e values.' testn = 16691381808213609635656612695328489234826227577985206736118595570304213887605602327717776979169783795560145663031146864154748634207927153095849203939039346778471192284119479329875655789428795925773927040539038073349089996911318012189546542694411685389074592231210678771416758973061752125295462189928432307067746658691146428088703129795340914596189054255127032271420140641112277113597275245807890920656563056790943850440012709593297328230145129809419550219898595770524436575484115680960823105256137731976622290028349172297572826751147335728017861413787053794003722218722212196385625462088929496952843002425059308041193 teste = 65537 ripe = hashlib.new('ripemd160') sha = hashlib.new('sha512') sha.update(convertIntToString(testn)+convertIntToString(teste)) ripe.update(sha.digest()) encodedAddress = encodeAddress(1,1,ripe.digest()) print encodedAddress status,addressVersionNumber,streamNumber,data = decodeAddress(encodedAddress) print 'Status:', status print 'addressVersionNumber', addressVersionNumber print 'streamNumber', streamNumber print 'length of data(the ripe hash):', len(data)