import sys import hashlib import struct import base64 # Python 3.6+, the SHA3 is available in hashlib natively. Else this requires # the pysha3 package (pip install pysha3). if sys.version_info < (3, 6): import sha3 # Test vector to make sure the right sha3 version will be used. pysha3 < 1.0 # used the old Keccak implementation. During the finalization of SHA3, NIST # changed the delimiter suffix from 0x01 to 0x06. The Keccak sponge function # stayed the same. pysha3 1.0 provides the previous Keccak hash, too. TEST_VALUE = "e167f68d6563d75bb25f3aa49c29ef612d41352dc00606de7cbd630bb2665f51" if TEST_VALUE != sha3.sha3_256(b"Hello World").hexdigest(): print("pysha3 version is < 1.0. Please install from:") print("https://github.com/tiran/pysha3https://github.com/tiran/pysha3") sys.exit(1) # Checksum is built like so: # CHECKSUM = SHA3(".onion checksum" || PUBKEY || VERSION) PREFIX = ".onion checksum".encode() # 32 bytes ed25519 pubkey. PUBKEY = ("\x42" * 32).encode() # Version 3 is proposal224 VERSION = 3 data = struct.pack('15s32sb', PREFIX, PUBKEY, VERSION) checksum = hashlib.sha3_256(data).digest() # Onion address is built like so: # onion_address = base32(PUBKEY || CHECKSUM || VERSION) + ".onion" address = struct.pack('!32s2sb', PUBKEY, checksum, VERSION) onion_addr = base64.b32encode(address).decode().lower() print("%s" % (onion_addr))