277 lines
9.2 KiB
Python
277 lines
9.2 KiB
Python
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:])"""
|
|
|
|
#changed Bitmessage to accept addresses that lack the "BM-" prefix.
|
|
if address[:3] == 'BM-':
|
|
integer = decodeBase58(address[3:])
|
|
else:
|
|
integer = decodeBase58(address)
|
|
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 addBMIfNotPresent(address):
|
|
if address[:3] != 'BM-':
|
|
return 'BM-'+address
|
|
else:
|
|
return address
|
|
|
|
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 = '\x01' + '\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(1,8,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)
|