[tests] move generate_wif_key to wallet_util.py

generate_wif_key is a wallet utility function. Move
it from the EC key module to the wallet util module.

test/functional/rpc_createmultisig.py

@@ -11,12 +11,13 @@ import os
 
 from test_framework.authproxy import JSONRPCException
 from test_framework.descriptors import descsum_create, drop_origins
-from test_framework.key import ECPubKey, ECKey, bytes_to_wif
+from test_framework.key import ECPubKey, ECKey
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_raises_rpc_error,
     assert_equal,
 )
+from test_framework.wallet_util import bytes_to_wif
 
 class RpcCreateMultiSigTest(BitcoinTestFramework):
     def set_test_params(self):

test/functional/test_framework/key.py

@@ -8,8 +8,6 @@ keys, and is trivially vulnerable to side channel attacks. Do not use for
 anything but tests."""
 import random
 
-from .address import byte_to_base58
-
 def modinv(a, n):
     """Compute the modular inverse of a modulo n
 
@@ -386,14 +384,3 @@ class ECKey():
         rb = r.to_bytes((r.bit_length() + 8) // 8, 'big')
         sb = s.to_bytes((s.bit_length() + 8) // 8, 'big')
         return b'\x30' + bytes([4 + len(rb) + len(sb), 2, len(rb)]) + rb + bytes([2, len(sb)]) + sb
-
-def bytes_to_wif(b, compressed=True):
-    if compressed:
-        b += b'\x01'
-    return byte_to_base58(b, 239)
-
-def generate_wif_key():
-    # Makes a WIF privkey for imports
-    k = ECKey()
-    k.generate()
-    return bytes_to_wif(k.get_bytes(), k.is_compressed)

test/functional/test_framework/wallet_util.py

@@ -6,6 +6,7 @@
 from collections import namedtuple
 
 from test_framework.address import (
+    byte_to_base58,
     key_to_p2pkh,
     key_to_p2sh_p2wpkh,
     key_to_p2wpkh,
@@ -13,10 +14,7 @@ from test_framework.address import (
     script_to_p2sh_p2wsh,
     script_to_p2wsh,
 )
-from test_framework.key import (
+from test_framework.key import ECKey
-    bytes_to_wif,
-    ECKey,
-)
 from test_framework.script import (
     CScript,
     OP_0,
@@ -120,3 +118,14 @@ def test_address(node, address, **kwargs):
                 raise AssertionError("key {} unexpectedly returned in getaddressinfo.".format(key))
         elif addr_info[key] != value:
             raise AssertionError("key {} value {} did not match expected value {}".format(key, addr_info[key], value))
+
+def bytes_to_wif(b, compressed=True):
+    if compressed:
+        b += b'\x01'
+    return byte_to_base58(b, 239)
+
+def generate_wif_key():
+    # Makes a WIF privkey for imports
+    k = ECKey()
+    k.generate()
+    return bytes_to_wif(k.get_bytes(), k.is_compressed)