hs_build_address.py (1859B)
1 # Future imports for Python 2.7, mandatory in 3.0 2 from __future__ import division 3 from __future__ import print_function 4 from __future__ import unicode_literals 5 6 import sys 7 import hashlib 8 import struct 9 import base64 10 11 # Python 3.6+, the SHA3 is available in hashlib natively. Else this requires 12 # the pysha3 package (pip install pysha3). 13 TEST_INPUT = b"Hello World" 14 if sys.version_info < (3, 6): 15 import sha3 16 m = sha3.sha3_256(TEST_INPUT) 17 else: 18 m = hashlib.sha3_256(TEST_INPUT) 19 20 # Test vector to make sure the right sha3 version will be used. pysha3 < 1.0 21 # used the old Keccak implementation. During the finalization of SHA3, NIST 22 # changed the delimiter suffix from 0x01 to 0x06. The Keccak sponge function 23 # stayed the same. pysha3 1.0 provides the previous Keccak hash, too. 24 TEST_VALUE = "e167f68d6563d75bb25f3aa49c29ef612d41352dc00606de7cbd630bb2665f51" 25 if TEST_VALUE != m.hexdigest(): 26 print("pysha3 version is < 1.0. Please install from:") 27 print("https://github.com/tiran/pysha3") 28 sys.exit(1) 29 30 # Checksum is built like so: 31 # CHECKSUM = SHA3(".onion checksum" || PUBKEY || VERSION) 32 PREFIX = ".onion checksum".encode() 33 # 32 bytes ed25519 pubkey from first test vector of 34 # https://tools.ietf.org/html/draft-josefsson-eddsa-ed25519-02#section-6 35 PUBKEY_STRING = "d75a980182b10ab7d54bfed3c964073a0ee172f3daa62325af021a68f707511a" 36 if sys.version_info < (3, 0): 37 PUBKEY = PUBKEY_STRING.decode('hex') 38 else: 39 PUBKEY = bytes.fromhex(PUBKEY_STRING) 40 # Version 3 is proposal224 41 VERSION = 3 42 43 data = struct.pack('15s32sb', PREFIX, PUBKEY, VERSION) 44 checksum = hashlib.sha3_256(data).digest() 45 46 # Onion address is built like so: 47 # onion_address = base32(PUBKEY || CHECKSUM || VERSION) + ".onion" 48 address = struct.pack('!32s2sb', PUBKEY, checksum, VERSION) 49 onion_addr = base64.b32encode(address).decode().lower() 50 51 print("%s" % (onion_addr))