Merge bitcoin#27269: test: Support decoding segwit address in address…

…_to_scriptpubkey()

d178082 test: add bech32 decoding support to address_to_scriptpubkey() (ismaelsadeeq)
aac8793 test: test_bech32_decode in address.py (ismaelsadeeq)

Pull request description:

  [rpc_scantxoutset.py](https://github.com/bitcoin/bitcoin/blob/e695d8536e534f1e59de4a62a0d87a93e7a73456/test/functional/rpc_scantxoutset.py#L26)  sendtodestination only sends to legacy addresses and scriptPubkeys because  [wallet.py](https://github.com/bitcoin/bitcoin/blob/e695d8536e534f1e59de4a62a0d87a93e7a73456/test/functional/test_framework/wallet.py#L415) address_to_scriptpubkey does not support conversion of segwit address.

  This update enables address_to_scriptpubkey to support the conversion of testnet segwit addresses to scriptPubkeys.

  This change will enable [rpc_scantxoutset.py](https://github.com/bitcoin/bitcoin/blob/e695d8536e534f1e59de4a62a0d87a93e7a73456/test/functional/rpc_scantxoutset.py#L22) ScantxoutsetTest to have more test coverage by adding more sendtodestination calls with bech32 and bech32m testnet addresses, then test the bech32 and bech32m  derivation subsets UTXO amount in [Test extended key derivation](https://github.com/bitcoin/bitcoin/blob/e695d8536e534f1e59de4a62a0d87a93e7a73456/test/functional/rpc_scantxoutset.py#L84).

  I will add the test coverage in a subsequent Pull request.

ACKs for top commit:
  josibake:
    ACK bitcoin@d178082
  theStack:
    ACK d178082 ✔️
  willcl-ark:
    ACK d178082

Tree-SHA512: 312c20ce192c648faf7dd178622700c9b871d755db56c246250e25508c3c19e7b02c0ae901dda11a1794629b9a9429c877168c05e1c4c1dbf41493316e30e7e9

test/functional/test_framework/address.py

@@ -20,8 +20,11 @@
     sha256,
     taproot_construct,
 )
-from .segwit_addr import encode_segwit_address
 from .util import assert_equal
+from test_framework.segwit_addr import (
+    decode_segwit_address,
+    encode_segwit_address,
+)
 
 ADDRESS_BCRT1_UNSPENDABLE = 'bcrt1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq3xueyj'
 ADDRESS_BCRT1_UNSPENDABLE_DESCRIPTOR = 'addr(bcrt1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq3xueyj)#juyq9d97'
@@ -159,6 +162,16 @@ def check_script(script):
     assert False
 
 
+def bech32_to_bytes(address):
+    hrp = address.split('1')[0]
+    if hrp not in ['bc', 'tb', 'bcrt']:
+        return (None, None)
+    version, payload = decode_segwit_address(hrp, address)
+    if version is None:
+        return (None, None)
+    return version, bytearray(payload)
+
+
 class TestFrameworkScript(unittest.TestCase):
     def test_base58encodedecode(self):
         def check_base58(data, version):
@@ -176,3 +189,18 @@ def check_base58(data, version):
         check_base58(bytes.fromhex('0041c1eaf111802559bad61b60d62b1f897c63928a'), 0)
         check_base58(bytes.fromhex('000041c1eaf111802559bad61b60d62b1f897c63928a'), 0)
         check_base58(bytes.fromhex('00000041c1eaf111802559bad61b60d62b1f897c63928a'), 0)
+
+
+    def test_bech32_decode(self):
+        def check_bech32_decode(payload, version):
+            hrp = "tb"
+            self.assertEqual(bech32_to_bytes(encode_segwit_address(hrp, version, payload)), (version, payload))
+
+        check_bech32_decode(bytes.fromhex('36e3e2a33f328de12e4b43c515a75fba2632ecc3'), 0)
+        check_bech32_decode(bytes.fromhex('823e9790fc1d1782321140d4f4aa61aabd5e045b'), 0)
+        check_bech32_decode(bytes.fromhex('79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798'), 1)
+        check_bech32_decode(bytes.fromhex('39cf8ebd95134f431c39db0220770bd127f5dd3cc103c988b7dcd577ae34e354'), 1)
+        check_bech32_decode(bytes.fromhex('708244006d27c757f6f1fc6f853b6ec26268b727866f7ce632886e34eb5839a3'), 1)
+        check_bech32_decode(bytes.fromhex('616211ab00dffe0adcb6ce258d6d3fd8cbd901e2'), 0)
+        check_bech32_decode(bytes.fromhex('b6a7c98b482d7fb21c9fa8e65692a0890410ff22'), 0)
+        check_bech32_decode(bytes.fromhex('f0c2109cb1008cfa7b5a09cc56f7267cd8e50929'), 0)

test/functional/test_framework/wallet.py

@@ -14,6 +14,7 @@
 )
 from test_framework.address import (
     base58_to_byte,
+    bech32_to_bytes,
     create_deterministic_address_bcrt1_p2tr_op_true,
     key_to_p2pkh,
     key_to_p2sh_p2wpkh,
@@ -49,6 +50,7 @@
     key_to_p2sh_p2wpkh_script,
     key_to_p2wpkh_script,
     keyhash_to_p2pkh_script,
+    program_to_witness_script,
     scripthash_to_p2sh_script,
 )
 from test_framework.util import (
@@ -414,6 +416,9 @@ def getnewdestination(address_type='bech32m'):
 
 def address_to_scriptpubkey(address):
     """Converts a given address to the corresponding output script (scriptPubKey)."""
+    version, payload = bech32_to_bytes(address)
+    if version is not None:
+        return program_to_witness_script(version, payload) # testnet segwit scriptpubkey
     payload, version = base58_to_byte(address)
     if version == 111:  # testnet pubkey hash
         return keyhash_to_p2pkh_script(payload)