[test] rename SegwitVersion1SignatureHash()

The function implementing segwit v0 signature hash was originally named
SegwitVersion1SignatureHash() (presumably before segwit v0 was named
segwit v0). Rename it to SegwitV0SignatureHash().

Also rename SignatureHash() to LegacySignatureHash() for disambiguation.

Author: jnewbery

test/functional/feature_block.py

@@ -46,7 +46,7 @@
     OP_RETURN,
     OP_TRUE,
     SIGHASH_ALL,
-    SignatureHash,
+    LegacySignatureHash,
     hash160,
 )
 from test_framework.test_framework import BitcoinTestFramework
@@ -532,7 +532,7 @@ def run_test(self):
             # second input is corresponding P2SH output from b39
             tx.vin.append(CTxIn(COutPoint(b39.vtx[i].sha256, 0), b''))
             # Note: must pass the redeem_script (not p2sh_script) to the signature hash function
-            (sighash, err) = SignatureHash(redeem_script, tx, 1, SIGHASH_ALL)
+            (sighash, err) = LegacySignatureHash(redeem_script, tx, 1, SIGHASH_ALL)
             sig = self.coinbase_key.sign_ecdsa(sighash) + bytes(bytearray([SIGHASH_ALL]))
             scriptSig = CScript([sig, redeem_script])
 
@@ -1312,7 +1312,7 @@ def sign_tx(self, tx, spend_tx):
         if (scriptPubKey[0] == OP_TRUE):  # an anyone-can-spend
             tx.vin[0].scriptSig = CScript()
             return
-        (sighash, err) = SignatureHash(spend_tx.vout[0].scriptPubKey, tx, 0, SIGHASH_ALL)
+        (sighash, err) = LegacySignatureHash(spend_tx.vout[0].scriptPubKey, tx, 0, SIGHASH_ALL)
         tx.vin[0].scriptSig = CScript([self.coinbase_key.sign_ecdsa(sighash) + bytes(bytearray([SIGHASH_ALL]))])
 
     def create_and_sign_transaction(self, spend_tx, value, script=CScript([OP_TRUE])):

test/functional/p2p_segwit.py

@@ -67,8 +67,8 @@
     SIGHASH_ANYONECANPAY,
     SIGHASH_NONE,
     SIGHASH_SINGLE,
-    SegwitVersion1SignatureHash,
-    SignatureHash,
+    SegwitV0SignatureHash,
+    LegacySignatureHash,
     hash160,
 )
 from test_framework.test_framework import BitcoinTestFramework
@@ -103,7 +103,7 @@ def get_p2pkh_script(pubkeyhash):
 
 def sign_p2pk_witness_input(script, tx_to, in_idx, hashtype, value, key):
     """Add signature for a P2PK witness program."""
-    tx_hash = SegwitVersion1SignatureHash(script, tx_to, in_idx, hashtype, value)
+    tx_hash = SegwitV0SignatureHash(script, tx_to, in_idx, hashtype, value)
     signature = key.sign_ecdsa(tx_hash) + chr(hashtype).encode('latin-1')
     tx_to.wit.vtxinwit[in_idx].scriptWitness.stack = [signature, script]
     tx_to.rehash()
@@ -1489,7 +1489,7 @@ def test_uncompressed_pubkey(self):
         tx2.vin.append(CTxIn(COutPoint(tx.sha256, 0), b""))
         tx2.vout.append(CTxOut(tx.vout[0].nValue - 1000, script_wsh))
         script = get_p2pkh_script(pubkeyhash)
-        sig_hash = SegwitVersion1SignatureHash(script, tx2, 0, SIGHASH_ALL, tx.vout[0].nValue)
+        sig_hash = SegwitV0SignatureHash(script, tx2, 0, SIGHASH_ALL, tx.vout[0].nValue)
         signature = key.sign_ecdsa(sig_hash) + b'\x01'  # 0x1 is SIGHASH_ALL
         tx2.wit.vtxinwit.append(CTxInWitness())
         tx2.wit.vtxinwit[0].scriptWitness.stack = [signature, pubkey]
@@ -1543,7 +1543,7 @@ def test_uncompressed_pubkey(self):
         tx5 = CTransaction()
         tx5.vin.append(CTxIn(COutPoint(tx4.sha256, 0), b""))
         tx5.vout.append(CTxOut(tx4.vout[0].nValue - 1000, CScript([OP_TRUE])))
-        (sig_hash, err) = SignatureHash(script_pubkey, tx5, 0, SIGHASH_ALL)
+        (sig_hash, err) = LegacySignatureHash(script_pubkey, tx5, 0, SIGHASH_ALL)
         signature = key.sign_ecdsa(sig_hash) + b'\x01'  # 0x1 is SIGHASH_ALL
         tx5.vin[0].scriptSig = CScript([signature, pubkey])
         tx5.rehash()
@@ -1693,7 +1693,7 @@ def test_signature_version_1(self):
         tx2.vout.append(CTxOut(tx.vout[0].nValue, CScript([OP_TRUE])))
 
         script = get_p2pkh_script(pubkeyhash)
-        sig_hash = SegwitVersion1SignatureHash(script, tx2, 0, SIGHASH_ALL, tx.vout[0].nValue)
+        sig_hash = SegwitV0SignatureHash(script, tx2, 0, SIGHASH_ALL, tx.vout[0].nValue)
         signature = key.sign_ecdsa(sig_hash) + b'\x01'  # 0x1 is SIGHASH_ALL
 
         # Check that we can't have a scriptSig

test/functional/test_framework/script.py

@@ -2,7 +2,7 @@
 # Copyright (c) 2015-2019 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
-"""Functionality to build scripts, as well as SignatureHash().
+"""Functionality to build scripts, as well as signature hash functions.
 
 This file is modified from python-bitcoinlib.
 """
@@ -608,7 +608,7 @@ def FindAndDelete(script, sig):
     return CScript(r)
 
 
-def SignatureHash(script, txTo, inIdx, hashtype):
+def LegacySignatureHash(script, txTo, inIdx, hashtype):
     """Consensus-correct SignatureHash
 
     Returns (hash, err) to precisely match the consensus-critical behavior of
@@ -662,7 +662,7 @@ def SignatureHash(script, txTo, inIdx, hashtype):
 # Performance optimization probably not necessary for python tests, however.
 # Note that this corresponds to sigversion == 1 in EvalScript, which is used
 # for version 0 witnesses.
-def SegwitVersion1SignatureHash(script, txTo, inIdx, hashtype, amount):
+def SegwitV0SignatureHash(script, txTo, inIdx, hashtype, amount):
 
     hashPrevouts = 0
     hashSequence = 0