Merge bitcoin/bitcoin#28727: test: replace random_bytes with random.randbytes

fe3ac3700d31a6329056fee983d91dd8e4c987c1 test: replace random_bytes with randbytes #28720 (ns-xvrn)

Pull request description:

  With Python upgraded to 3.9 replaced the `random_bytes` function in util of functional tests and replaced it's usage with `random.randbytes`.

  Closes #28720.

ACKs for top commit:
  maflcko:
    lgtm ACK fe3ac3700d31a6329056fee983d91dd8e4c987c1
  BrandonOdiwuor:
    ACK fe3ac3700d31a6329056fee983d91dd8e4c987c1
  stickies-v:
    ACK fe3ac3700d31a6329056fee983d91dd8e4c987c1, thanks for picking this up
  kristapsk:
    utACK fe3ac3700d31a6329056fee983d91dd8e4c987c1

Tree-SHA512: f65a75e73ebd840c2936eb133d42bccd552f25b717c8ca25c18d06e0593e12f292389cfcc0a0b0759004b67a46ea0c8ac237973ef90f246139778230be1e64e1

5 files changed, 35 insertions, 44 deletions

diff --git a/test/functional/feature_taproot.py b/test/functional/feature_taproot.py
index e32319961e..1d8c87feb5 100755
--- a/test/functional/feature_taproot.py
+++ b/test/functional/feature_taproot.py
@@ -95,7 +95,6 @@ from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_raises_rpc_error,
     assert_equal,
-    random_bytes,
 )
 from test_framework.wallet_util import generate_keypair
 from test_framework.key import (
@@ -694,7 +693,7 @@ def spenders_taproot_active():
 
     # Generate an invalid public key
     while True:
-        invalid_pub = random_bytes(32)
+        invalid_pub = random.randbytes(32)
         if not secp256k1.GE.is_valid_x(int.from_bytes(invalid_pub, 'big')):
             break
 
@@ -710,7 +709,7 @@ def spenders_taproot_active():
     # == Tests for signature hashing ==
 
     # Run all tests once with no annex, and once with a valid random annex.
-    for annex in [None, lambda _: bytes([ANNEX_TAG]) + random_bytes(random.randrange(0, 250))]:
+    for annex in [None, lambda _: bytes([ANNEX_TAG]) + random.randbytes(random.randrange(0, 250))]:
         # Non-empty annex is non-standard
         no_annex = annex is None
 
@@ -739,7 +738,7 @@ def spenders_taproot_active():
         scripts = [
             ("pk_codesep", CScript(random_checksig_style(pubs[1]) + bytes([OP_CODESEPARATOR]))),  # codesep after checksig
             ("codesep_pk", CScript(bytes([OP_CODESEPARATOR]) + random_checksig_style(pubs[1]))),  # codesep before checksig
-            ("branched_codesep", CScript([random_bytes(random.randrange(2, 511)), OP_DROP, OP_IF, OP_CODESEPARATOR, pubs[0], OP_ELSE, OP_CODESEPARATOR, pubs[1], OP_ENDIF, OP_CHECKSIG])),  # branch dependent codesep
+            ("branched_codesep", CScript([random.randbytes(random.randrange(2, 511)), OP_DROP, OP_IF, OP_CODESEPARATOR, pubs[0], OP_ELSE, OP_CODESEPARATOR, pubs[1], OP_ENDIF, OP_CHECKSIG])),  # branch dependent codesep
             # Note that the first data push in the "branched_codesep" script has the purpose of
             # randomizing the sighash, both by varying script size and content. In order to
             # avoid MINIMALDATA script verification errors caused by not-minimal-encoded data
@@ -792,8 +791,8 @@ def spenders_taproot_active():
         add_spender(spenders, "siglen/empty_csv", tap=tap, key=secs[2], leaf="csv", hashtype=hashtype, **SINGLE_SIG, failure={"sign": b""}, **ERR_CHECKSIGVERIFY)
         add_spender(spenders, "siglen/empty_cs", tap=tap, key=secs[2], leaf="cs_pos", hashtype=hashtype, **SINGLE_SIG, failure={"sign": b""}, **ERR_NO_SUCCESS)
         add_spender(spenders, "siglen/empty_csa", tap=tap, key=secs[2], leaf="csa_pos", hashtype=hashtype, **SINGLE_SIG, failure={"sign": b""}, **ERR_NO_SUCCESS)
-        add_spender(spenders, "siglen/empty_cs_neg", tap=tap, key=secs[2], leaf="cs_neg", hashtype=hashtype, **SINGLE_SIG, sign=b"", failure={"sign": lambda _: random_bytes(random.randrange(1, 63))}, **ERR_SIG_SIZE)
-        add_spender(spenders, "siglen/empty_csa_neg", tap=tap, key=secs[2], leaf="csa_neg", hashtype=hashtype, **SINGLE_SIG, sign=b"", failure={"sign": lambda _: random_bytes(random.randrange(66, 100))}, **ERR_SIG_SIZE)
+        add_spender(spenders, "siglen/empty_cs_neg", tap=tap, key=secs[2], leaf="cs_neg", hashtype=hashtype, **SINGLE_SIG, sign=b"", failure={"sign": lambda _: random.randbytes(random.randrange(1, 63))}, **ERR_SIG_SIZE)
+        add_spender(spenders, "siglen/empty_csa_neg", tap=tap, key=secs[2], leaf="csa_neg", hashtype=hashtype, **SINGLE_SIG, sign=b"", failure={"sign": lambda _: random.randbytes(random.randrange(66, 100))}, **ERR_SIG_SIZE)
         # Appending a zero byte to signatures invalidates them
         add_spender(spenders, "siglen/padzero_keypath", tap=tap, key=secs[3], hashtype=hashtype, **SIG_ADD_ZERO, **(ERR_SIG_HASHTYPE if hashtype == SIGHASH_DEFAULT else ERR_SIG_SIZE))
         add_spender(spenders, "siglen/padzero_csv", tap=tap, key=secs[2], leaf="csv", hashtype=hashtype, **SINGLE_SIG, **SIG_ADD_ZERO, **(ERR_SIG_HASHTYPE if hashtype == SIGHASH_DEFAULT else ERR_SIG_SIZE))
@@ -874,14 +873,14 @@ def spenders_taproot_active():
     # Test that empty witnesses are invalid.
     add_spender(spenders, "spendpath/emptywit", tap=tap, leaf="128deep", **SINGLE_SIG, key=secs[0], failure={"witness": []}, **ERR_EMPTY_WITNESS)
     # Test that adding garbage to the control block invalidates it.
-    add_spender(spenders, "spendpath/padlongcontrol", tap=tap, leaf="128deep", **SINGLE_SIG, key=secs[0], failure={"controlblock": lambda ctx: default_controlblock(ctx) + random_bytes(random.randrange(1, 32))}, **ERR_CONTROLBLOCK_SIZE)
+    add_spender(spenders, "spendpath/padlongcontrol", tap=tap, leaf="128deep", **SINGLE_SIG, key=secs[0], failure={"controlblock": lambda ctx: default_controlblock(ctx) + random.randbytes(random.randrange(1, 32))}, **ERR_CONTROLBLOCK_SIZE)
     # Test that truncating the control block invalidates it.
     add_spender(spenders, "spendpath/trunclongcontrol", tap=tap, leaf="128deep", **SINGLE_SIG, key=secs[0], failure={"controlblock": lambda ctx: default_merklebranch(ctx)[0:random.randrange(1, 32)]}, **ERR_CONTROLBLOCK_SIZE)
 
     scripts = [("s", CScript([pubs[0], OP_CHECKSIG]))]
     tap = taproot_construct(pubs[1], scripts)
     # Test that adding garbage to the control block invalidates it.
-    add_spender(spenders, "spendpath/padshortcontrol", tap=tap, leaf="s", **SINGLE_SIG, key=secs[0], failure={"controlblock": lambda ctx: default_controlblock(ctx) + random_bytes(random.randrange(1, 32))}, **ERR_CONTROLBLOCK_SIZE)
+    add_spender(spenders, "spendpath/padshortcontrol", tap=tap, leaf="s", **SINGLE_SIG, key=secs[0], failure={"controlblock": lambda ctx: default_controlblock(ctx) + random.randbytes(random.randrange(1, 32))}, **ERR_CONTROLBLOCK_SIZE)
     # Test that truncating the control block invalidates it.
     add_spender(spenders, "spendpath/truncshortcontrol", tap=tap, leaf="s", **SINGLE_SIG, key=secs[0], failure={"controlblock": lambda ctx: default_merklebranch(ctx)[0:random.randrange(1, 32)]}, **ERR_CONTROLBLOCK_SIZE)
     # Test that truncating the control block to 1 byte ("-1 Merkle length") invalidates it
@@ -970,9 +969,9 @@ def spenders_taproot_active():
         # 24) Script that expects an input stack of 1001 elements
         ("t24", CScript([OP_DROP] * 1000 + [pubs[1], OP_CHECKSIG])),
         # 25) Script that pushes a MAX_SCRIPT_ELEMENT_SIZE-bytes element
-        ("t25", CScript([random_bytes(MAX_SCRIPT_ELEMENT_SIZE), OP_DROP, pubs[1], OP_CHECKSIG])),
+        ("t25", CScript([random.randbytes(MAX_SCRIPT_ELEMENT_SIZE), OP_DROP, pubs[1], OP_CHECKSIG])),
         # 26) Script that pushes a (MAX_SCRIPT_ELEMENT_SIZE+1)-bytes element
-        ("t26", CScript([random_bytes(MAX_SCRIPT_ELEMENT_SIZE+1), OP_DROP, pubs[1], OP_CHECKSIG])),
+        ("t26", CScript([random.randbytes(MAX_SCRIPT_ELEMENT_SIZE+1), OP_DROP, pubs[1], OP_CHECKSIG])),
         # 27) CHECKSIGADD that must fail because numeric argument number is >4 bytes
         ("t27", CScript([CScriptNum(OVERSIZE_NUMBER), pubs[1], OP_CHECKSIGADD])),
         # 28) Pushes random CScriptNum value, checks OP_CHECKSIGADD result
@@ -1005,9 +1004,9 @@ def spenders_taproot_active():
         "tap": tap,
     }
     # Test that MAX_SCRIPT_ELEMENT_SIZE byte stack element inputs are valid, but not one more (and 80 bytes is standard but 81 is not).
-    add_spender(spenders, "tapscript/inputmaxlimit", leaf="t0", **common, standard=False, inputs=[getter("sign"), random_bytes(MAX_SCRIPT_ELEMENT_SIZE)], failure={"inputs": [getter("sign"), random_bytes(MAX_SCRIPT_ELEMENT_SIZE+1)]}, **ERR_PUSH_LIMIT)
-    add_spender(spenders, "tapscript/input80limit", leaf="t0", **common, inputs=[getter("sign"), random_bytes(80)])
-    add_spender(spenders, "tapscript/input81limit", leaf="t0", **common, standard=False, inputs=[getter("sign"), random_bytes(81)])
+    add_spender(spenders, "tapscript/inputmaxlimit", leaf="t0", **common, standard=False, inputs=[getter("sign"), random.randbytes(MAX_SCRIPT_ELEMENT_SIZE)], failure={"inputs": [getter("sign"), random.randbytes(MAX_SCRIPT_ELEMENT_SIZE+1)]}, **ERR_PUSH_LIMIT)
+    add_spender(spenders, "tapscript/input80limit", leaf="t0", **common, inputs=[getter("sign"), random.randbytes(80)])
+    add_spender(spenders, "tapscript/input81limit", leaf="t0", **common, standard=False, inputs=[getter("sign"), random.randbytes(81)])
     # Test that OP_CHECKMULTISIG and OP_CHECKMULTISIGVERIFY cause failure, but OP_CHECKSIG and OP_CHECKSIGVERIFY work.
     add_spender(spenders, "tapscript/disabled_checkmultisig", leaf="t1", **common, **SINGLE_SIG, failure={"leaf": "t3"}, **ERR_TAPSCRIPT_CHECKMULTISIG)
     add_spender(spenders, "tapscript/disabled_checkmultisigverify", leaf="t2", **common, **SINGLE_SIG, failure={"leaf": "t4"}, **ERR_TAPSCRIPT_CHECKMULTISIG)
@@ -1062,7 +1061,7 @@ def spenders_taproot_active():
         # n OP_CHECKSIGVERIFYs and 1 OP_CHECKSIGADD, but also one unexecuted OP_CHECKSIGVERIFY.
         lambda n, pk: (CScript([OP_DROP, pk, OP_0, OP_IF, OP_2DUP, OP_CHECKSIGVERIFY, OP_ENDIF] + [OP_2DUP, OP_CHECKSIGVERIFY] * n + [OP_2, OP_SWAP, OP_CHECKSIGADD, OP_3, OP_EQUAL]), n + 1),
         # n OP_CHECKSIGVERIFYs and 1 OP_CHECKSIGADD, but also one unexecuted OP_CHECKSIG.
-        lambda n, pk: (CScript([random_bytes(220), OP_2DROP, pk, OP_1, OP_NOTIF, OP_2DUP, OP_CHECKSIG, OP_VERIFY, OP_ENDIF] + [OP_2DUP, OP_CHECKSIGVERIFY] * n + [OP_4, OP_SWAP, OP_CHECKSIGADD, OP_5, OP_EQUAL]), n + 1),
+        lambda n, pk: (CScript([random.randbytes(220), OP_2DROP, pk, OP_1, OP_NOTIF, OP_2DUP, OP_CHECKSIG, OP_VERIFY, OP_ENDIF] + [OP_2DUP, OP_CHECKSIGVERIFY] * n + [OP_4, OP_SWAP, OP_CHECKSIGADD, OP_5, OP_EQUAL]), n + 1),
         # n OP_CHECKSIGVERIFYs and 1 OP_CHECKSIGADD, but also one unexecuted OP_CHECKSIGADD.
         lambda n, pk: (CScript([OP_DROP, pk, OP_1, OP_IF, OP_ELSE, OP_2DUP, OP_6, OP_SWAP, OP_CHECKSIGADD, OP_7, OP_EQUALVERIFY, OP_ENDIF] + [OP_2DUP, OP_CHECKSIGVERIFY] * n + [OP_8, OP_SWAP, OP_CHECKSIGADD, OP_9, OP_EQUAL]), n + 1),
         # n+1 OP_CHECKSIGs, but also one OP_CHECKSIG with an empty signature.
@@ -1070,9 +1069,9 @@ def spenders_taproot_active():
         # n OP_CHECKSIGADDs and 1 OP_CHECKSIG, but also an OP_CHECKSIGADD with an empty signature.
         lambda n, pk: (CScript([OP_DROP, OP_0, OP_10, pk, OP_CHECKSIGADD, OP_10, OP_EQUALVERIFY, pk] + [OP_2DUP, OP_16, OP_SWAP, OP_CHECKSIGADD, b'\x11', OP_EQUALVERIFY] * n + [OP_CHECKSIG]), n + 1),
     ]
-    for annex in [None, bytes([ANNEX_TAG]) + random_bytes(random.randrange(1000))]:
+    for annex in [None, bytes([ANNEX_TAG]) + random.randbytes(random.randrange(1000))]:
         for hashtype in [SIGHASH_DEFAULT, SIGHASH_ALL]:
-            for pubkey in [pubs[1], random_bytes(random.choice([x for x in range(2, 81) if x != 32]))]:
+            for pubkey in [pubs[1], random.randbytes(random.choice([x for x in range(2, 81) if x != 32]))]:
                 for fn_num, fn in enumerate(SIGOPS_RATIO_SCRIPTS):
                     merkledepth = random.randrange(129)
 
@@ -1109,7 +1108,7 @@ def spenders_taproot_active():
                         scripts = [scripts, random.choice(PARTNER_MERKLE_FN)]
                     tap = taproot_construct(pubs[0], scripts)
                     standard = annex is None and dummylen <= 80 and len(pubkey) == 32
-                    add_spender(spenders, "tapscript/sigopsratio_%i" % fn_num, tap=tap, leaf="s", annex=annex, hashtype=hashtype, key=secs[1], inputs=[getter("sign"), random_bytes(dummylen)], standard=standard, failure={"inputs": [getter("sign"), random_bytes(dummylen - 1)]}, **ERR_SIGOPS_RATIO)
+                    add_spender(spenders, "tapscript/sigopsratio_%i" % fn_num, tap=tap, leaf="s", annex=annex, hashtype=hashtype, key=secs[1], inputs=[getter("sign"), random.randbytes(dummylen)], standard=standard, failure={"inputs": [getter("sign"), random.randbytes(dummylen - 1)]}, **ERR_SIGOPS_RATIO)
 
     # Future leaf versions
     for leafver in range(0, 0x100, 2):
@@ -1123,8 +1122,8 @@ def spenders_taproot_active():
             ("return_unkver", CScript([OP_RETURN]), leafver),
             ("undecodable_c0", CScript([OP_PUSHDATA1])),
             ("undecodable_unkver", CScript([OP_PUSHDATA1]), leafver),
-            ("bigpush_c0", CScript([random_bytes(MAX_SCRIPT_ELEMENT_SIZE+1), OP_DROP])),
-            ("bigpush_unkver", CScript([random_bytes(MAX_SCRIPT_ELEMENT_SIZE+1), OP_DROP]), leafver),
+            ("bigpush_c0", CScript([random.randbytes(MAX_SCRIPT_ELEMENT_SIZE+1), OP_DROP])),
+            ("bigpush_unkver", CScript([random.randbytes(MAX_SCRIPT_ELEMENT_SIZE+1), OP_DROP]), leafver),
             ("1001push_c0", CScript([OP_0] * 1001)),
             ("1001push_unkver", CScript([OP_0] * 1001), leafver),
         ]
@@ -1153,8 +1152,8 @@ def spenders_taproot_active():
             ("undecodable_success", CScript([opcode, OP_PUSHDATA1])),
             ("undecodable_nop", CScript([OP_NOP, OP_PUSHDATA1])),
             ("undecodable_bypassed_success", CScript([OP_PUSHDATA1, OP_2, opcode])),
-            ("bigpush_success", CScript([random_bytes(MAX_SCRIPT_ELEMENT_SIZE+1), OP_DROP, opcode])),
-            ("bigpush_nop", CScript([random_bytes(MAX_SCRIPT_ELEMENT_SIZE+1), OP_DROP, OP_NOP])),
+            ("bigpush_success", CScript([random.randbytes(MAX_SCRIPT_ELEMENT_SIZE+1), OP_DROP, opcode])),
+            ("bigpush_nop", CScript([random.randbytes(MAX_SCRIPT_ELEMENT_SIZE+1), OP_DROP, OP_NOP])),
             ("1001push_success", CScript([OP_0] * 1001 + [opcode])),
             ("1001push_nop", CScript([OP_0] * 1001 + [OP_NOP])),
         ]
diff --git a/test/functional/mempool_datacarrier.py b/test/functional/mempool_datacarrier.py
index 951bf37ae8..2e27aa988e 100755
--- a/test/functional/mempool_datacarrier.py
+++ b/test/functional/mempool_datacarrier.py
@@ -13,12 +13,11 @@ from test_framework.script import (
 )
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.test_node import TestNode
-from test_framework.util import (
-    assert_raises_rpc_error,
-    random_bytes,
-)
+from test_framework.util import assert_raises_rpc_error
 from test_framework.wallet import MiniWallet
 
+from random import randbytes
+
 
 class DataCarrierTest(BitcoinTestFramework):
     def set_test_params(self):
@@ -48,11 +47,11 @@ class DataCarrierTest(BitcoinTestFramework):
         self.wallet = MiniWallet(self.nodes[0])
 
         # By default, only 80 bytes are used for data (+1 for OP_RETURN, +2 for the pushdata opcodes).
-        default_size_data = random_bytes(MAX_OP_RETURN_RELAY - 3)
-        too_long_data = random_bytes(MAX_OP_RETURN_RELAY - 2)
-        small_data = random_bytes(MAX_OP_RETURN_RELAY - 4)
-        one_byte = random_bytes(1)
-        zero_bytes = random_bytes(0)
+        default_size_data = randbytes(MAX_OP_RETURN_RELAY - 3)
+        too_long_data = randbytes(MAX_OP_RETURN_RELAY - 2)
+        small_data = randbytes(MAX_OP_RETURN_RELAY - 4)
+        one_byte = randbytes(1)
+        zero_bytes = randbytes(0)
 
         self.log.info("Testing null data transaction with default -datacarrier and -datacarriersize values.")
         self.test_null_data_transaction(node=self.nodes[0], data=default_size_data, success=True)
diff --git a/test/functional/p2p_net_deadlock.py b/test/functional/p2p_net_deadlock.py
index f69fe52146..1a357b944b 100755
--- a/test/functional/p2p_net_deadlock.py
+++ b/test/functional/p2p_net_deadlock.py
@@ -5,7 +5,7 @@
 
 import threading
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import random_bytes
+from random import randbytes
 
 
 class NetDeadlockTest(BitcoinTestFramework):
@@ -18,7 +18,7 @@ class NetDeadlockTest(BitcoinTestFramework):
         node1 = self.nodes[1]
 
         self.log.info("Simultaneously send a large message on both sides")
-        rand_msg = random_bytes(4000000).hex()
+        rand_msg = randbytes(4000000).hex()
 
         thread0 = threading.Thread(target=node0.sendmsgtopeer, args=(0, "unknown", rand_msg))
         thread1 = threading.Thread(target=node1.sendmsgtopeer, args=(0, "unknown", rand_msg))
diff --git a/test/functional/rpc_psbt.py b/test/functional/rpc_psbt.py
index c92dc7b3c4..1fd938d18a 100755
--- a/test/functional/rpc_psbt.py
+++ b/test/functional/rpc_psbt.py
@@ -6,6 +6,7 @@
 """
 from decimal import Decimal
 from itertools import product
+from random import randbytes
 
 from test_framework.descriptors import descsum_create
 from test_framework.key import H_POINT
@@ -39,7 +40,6 @@ from test_framework.util import (
     assert_greater_than_or_equal,
     assert_raises_rpc_error,
     find_vout_for_address,
-    random_bytes,
 )
 from test_framework.wallet_util import (
     generate_keypair,
@@ -885,10 +885,10 @@ class PSBTTest(BitcoinTestFramework):
 
         self.log.info("Test decoding PSBT with per-input preimage types")
         # note that the decodepsbt RPC doesn't check whether preimages and hashes match
-        hash_ripemd160, preimage_ripemd160 = random_bytes(20), random_bytes(50)
-        hash_sha256, preimage_sha256 = random_bytes(32), random_bytes(50)
-        hash_hash160, preimage_hash160 = random_bytes(20), random_bytes(50)
-        hash_hash256, preimage_hash256 = random_bytes(32), random_bytes(50)
+        hash_ripemd160, preimage_ripemd160 = randbytes(20), randbytes(50)
+        hash_sha256, preimage_sha256 = randbytes(32), randbytes(50)
+        hash_hash160, preimage_hash160 = randbytes(20), randbytes(50)
+        hash_hash256, preimage_hash256 = randbytes(32), randbytes(50)
 
         tx = CTransaction()
         tx.vin = [CTxIn(outpoint=COutPoint(hash=int('aa' * 32, 16), n=0), scriptSig=b""),
diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py
index 51302ae061..104f158d92 100644
--- a/test/functional/test_framework/util.py
+++ b/test/functional/test_framework/util.py
@@ -13,7 +13,6 @@ import json
 import logging
 import os
 import pathlib
-import random
 import re
 import sys
 import time
@@ -287,12 +286,6 @@ def sha256sum_file(filename):
     return h.digest()
 
 
-# TODO: Remove and use random.randbytes(n) directly
-def random_bytes(n):
-    """Return a random bytes object of length n."""
-    return random.randbytes(n)
-
-
 # RPC/P2P connection constants and functions
 ############################################