Replace old pysha3 with cryptodomex, test on Python 3.10

pysha3 is pretty old and doesn't seem to have any modern Python
wheels, so it requires being compiled on Python 3.7 or newer.

Cryptodome is more modern and maintained, though larger.

.travis.yml

@@ -6,6 +6,7 @@ python:
   - "3.7"
   - "3.8"
   - "3.9"
+  - "3.10"
 matrix:
   allow_failures:
     python: "nightly"

monero/address.py

@@ -1,6 +1,5 @@
 from binascii import hexlify, unhexlify
 import re
-from sha3 import keccak_256
 import six
 import struct
 import warnings
@@ -9,6 +8,7 @@ from . import base58
 from . import const
 from . import ed25519
 from . import numbers
+from .keccak import keccak_256
 
 _ADDR_REGEX = re.compile(r'^[123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz]{95}$')
 _IADDR_REGEX = re.compile(r'^[123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz]{106}$')

monero/keccak.py

@@ -0,0 +1,10 @@
+from Cryptodome.Hash import keccak
+
+
+def keccak_256(data):
+    """
+    Return a hashlib-compatible Keccak 256 object for the given data.
+    """
+    hash = keccak.new(digest_bits=256)
+    hash.update(data)
+    return hash

monero/seed.py

@@ -37,10 +37,10 @@
 
 from binascii import hexlify, unhexlify
 from os import urandom
-from sha3 import keccak_256
 import warnings
 from . import base58, const, ed25519, wordlists
 from .address import address
+from .keccak import keccak_256
 
 class Seed(object):
     """Creates a seed object either from local system randomness or an imported phrase.
@@ -124,9 +124,7 @@ class Seed(object):
         return self.hex
 
     def _hex_seed_keccak(self):
-        h = keccak_256()
-        h.update(unhexlify(self.hex))
-        return h.digest()
+        return keccak_256(unhexlify(self.hex)).digest()
 
     def secret_spend_key(self):
         a = self._hex_seed_keccak() if self.is_mymonero() else unhexlify(self.hex)
@@ -134,9 +132,7 @@ class Seed(object):
 
     def secret_view_key(self):
         b = self._hex_seed_keccak() if self.is_mymonero() else unhexlify(self.secret_spend_key())
-        h = keccak_256()
-        h.update(b)
-        return self.sc_reduce(h.digest())
+        return self.sc_reduce(keccak_256(b).digest())
 
     def public_spend_key(self):
         if self._ed_pub_spend_key:
@@ -164,9 +160,7 @@ class Seed(object):
                 "Invalid net argument '{:s}'. Must be one of monero.const.NET_*".format(net))
         netbyte = (18, 53, 24)[const.NETS.index(net)]
         data = "{:x}{:s}{:s}".format(netbyte, self.public_spend_key(), self.public_view_key())
-        h = keccak_256()
-        h.update(unhexlify(data))
-        checksum = h.hexdigest()
+        checksum = keccak_256(unhexlify(data)).hexdigest()
         return address(base58.encode(data + checksum[0:8]))
 
 

monero/transaction/__init__.py

@@ -2,7 +2,6 @@ import binascii
 import itertools
 import operator
 import re
-import sha3
 import six
 import struct
 import varint
@@ -12,6 +11,7 @@ from ..numbers import from_atomic, PaymentID
 from .. import ed25519
 from .. import exceptions
 from .extra import ExtraParser
+from ..keccak import keccak_256
 
 class Payment(object):
     """
@@ -138,7 +138,7 @@ class Transaction(object):
                         varint.encode(idx),
                     ]
                 )
-                Hs_ur = sha3.keccak_256(hsdata).digest()
+                Hs_ur = keccak_256(hsdata).digest()
 
                 # sc_reduce32:
                 Hsint_ur = ed25519.decodeint(Hs_ur)
@@ -159,7 +159,7 @@ class Transaction(object):
                         timestamp=self.timestamp,
                         transaction=self,
                         local_address=addr)
-                amount_hs = sha3.keccak_256(b"amount" + Hs).digest()
+                amount_hs = keccak_256(b"amount" + Hs).digest()
                 xormask = amount_hs[:len(encamount)]
                 dec_amount = bytearray(a ^ b for a, b in zip(*map(bytearray, (encamount, xormask))))
                 int_amount = struct.unpack("<Q", dec_amount)[0]

monero/wallet.py

@@ -1,5 +1,4 @@
 from binascii import hexlify, unhexlify
-from sha3 import keccak_256
 import struct
 
 from . import address
@@ -9,6 +8,7 @@ from . import const
 from . import ed25519
 from . import numbers
 from .transaction import Payment, PaymentManager
+from .keccak import keccak_256
 
 class Wallet(object):
     """

requirements.txt

@@ -1,4 +1,4 @@
-pysha3
+pycryptodomex
 requests
 six>=1.12.0
 ipaddress