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- 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))
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