mirror of
https://github.com/FlipsideCrypto/dcrd.git
synced 2026-02-06 19:06:51 +00:00
11ae59977a
This modifies the script engine to replace OP_UNKNOWN192 with OP_SHA256 along with a flag named ScriptVerifySHA256 to selectively enable its enforcement. The new opcode consumes the top item from the data stack, computes its SHA-256, and pushes the resulting digest back to the data stack. Since it requires an item on the data stack, execution will terminate with an error when the stack is empty. This behavior differs from OP_UNKNOWN192 which does not consume any elements from the data stack and therefore makes this is hard-forking change when interpreted with the new semantics due to the ScriptVerifySHA256 flag being set. Code to selectively enable the opcode based on the result of an agenda vote will be added in a separate commit. This also includes tests to ensure the opcode works as expected including when used both correctly and incorrectly.
628 lines
16 KiB
Go
628 lines
16 KiB
Go
// Copyright (c) 2013-2015 The btcsuite developers
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// Copyright (c) 2015-2016 The Decred developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package txscript_test
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import (
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"bytes"
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"encoding/hex"
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"reflect"
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"testing"
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"github.com/decred/dcrd/chaincfg/chainhash"
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"github.com/decred/dcrd/txscript"
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"github.com/decred/dcrd/wire"
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)
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// TestPushedData ensured the PushedData function extracts the expected data out
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// of various scripts.
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func TestPushedData(t *testing.T) {
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t.Parallel()
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var tests = []struct {
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script string
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out [][]byte
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valid bool
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}{
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{
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"0 IF 0 ELSE 2 ENDIF",
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[][]byte{nil, nil},
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true,
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},
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{
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"16777216 10000000",
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[][]byte{
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{0x00, 0x00, 0x00, 0x01}, // 16777216
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{0x80, 0x96, 0x98, 0x00}, // 10000000
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},
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true,
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},
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{
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"DUP HASH160 '17VZNX1SN5NtKa8UQFxwQbFeFc3iqRYhem' EQUALVERIFY CHECKSIG",
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[][]byte{
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// 17VZNX1SN5NtKa8UQFxwQbFeFc3iqRYhem
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{
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0x31, 0x37, 0x56, 0x5a, 0x4e, 0x58, 0x31, 0x53, 0x4e, 0x35,
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0x4e, 0x74, 0x4b, 0x61, 0x38, 0x55, 0x51, 0x46, 0x78, 0x77,
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0x51, 0x62, 0x46, 0x65, 0x46, 0x63, 0x33, 0x69, 0x71, 0x52,
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0x59, 0x68, 0x65, 0x6d,
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},
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},
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true,
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},
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{
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"PUSHDATA4 1000 EQUAL",
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nil,
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false,
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},
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}
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for i, test := range tests {
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script := mustParseShortForm(test.script)
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data, err := txscript.PushedData(script)
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if test.valid && err != nil {
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t.Errorf("TestPushedData failed test #%d: %v\n", i, err)
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continue
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} else if !test.valid && err == nil {
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t.Errorf("TestPushedData failed test #%d: test should "+
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"be invalid\n", i)
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continue
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}
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if !reflect.DeepEqual(data, test.out) {
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t.Errorf("TestPushedData failed test #%d: want: %x "+
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"got: %x\n", i, test.out, data)
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}
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}
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}
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// TestHasCanonicalPush ensures the canonicalPush function works as expected.
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func TestHasCanonicalPush(t *testing.T) {
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t.Parallel()
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for i := 0; i < 65535; i++ {
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builder := txscript.NewScriptBuilder()
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builder.AddInt64(int64(i))
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script, err := builder.Script()
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if err != nil {
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t.Errorf("Script: test #%d unexpected error: %v\n", i,
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err)
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continue
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}
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if result := txscript.IsPushOnlyScript(script); !result {
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t.Errorf("IsPushOnlyScript: test #%d failed: %x\n", i,
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script)
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continue
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}
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pops, err := txscript.TstParseScript(script)
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if err != nil {
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t.Errorf("TstParseScript: #%d failed: %v", i, err)
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continue
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}
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for _, pop := range pops {
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if result := txscript.TstHasCanonicalPushes(pop); !result {
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t.Errorf("TstHasCanonicalPushes: test #%d "+
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"failed: %x\n", i, script)
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break
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}
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}
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}
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for i := 0; i <= txscript.MaxScriptElementSize; i++ {
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builder := txscript.NewScriptBuilder()
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builder.AddData(bytes.Repeat([]byte{0x49}, i))
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script, err := builder.Script()
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if err != nil {
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t.Errorf("StandardPushesTests test #%d unexpected error: %v\n", i, err)
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continue
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}
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if result := txscript.IsPushOnlyScript(script); !result {
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t.Errorf("StandardPushesTests IsPushOnlyScript test #%d failed: %x\n", i, script)
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continue
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}
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pops, err := txscript.TstParseScript(script)
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if err != nil {
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t.Errorf("StandardPushesTests #%d failed to TstParseScript: %v", i, err)
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continue
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}
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for _, pop := range pops {
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if result := txscript.TstHasCanonicalPushes(pop); !result {
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t.Errorf("StandardPushesTests TstHasCanonicalPushes test #%d failed: %x\n", i, script)
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break
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}
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}
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}
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}
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// TestGetPreciseSigOps ensures the more precise signature operation counting
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// mechanism which includes signatures in P2SH scripts works as expected.
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func TestGetPreciseSigOps(t *testing.T) {
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t.Parallel()
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tests := []struct {
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name string
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scriptSig []byte
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nSigOps int
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err error
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}{
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{
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name: "scriptSig doesn't parse",
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scriptSig: []byte{txscript.OP_PUSHDATA1, 2},
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err: txscript.ErrStackShortScript,
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},
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{
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name: "scriptSig isn't push only",
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scriptSig: []byte{txscript.OP_1, txscript.OP_DUP},
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nSigOps: 0,
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},
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{
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name: "scriptSig length 0",
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scriptSig: nil,
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nSigOps: 0,
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},
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{
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name: "No script at the end",
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// No script at end but still push only.
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scriptSig: []byte{txscript.OP_1, txscript.OP_1},
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nSigOps: 0,
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},
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{
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name: "pushed script doesn't parse",
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scriptSig: []byte{txscript.OP_DATA_2,
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txscript.OP_PUSHDATA1, 2},
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err: txscript.ErrStackShortScript,
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},
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}
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// The signature in the p2sh script is nonsensical for the tests since
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// this script will never be executed. What matters is that it matches
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// the right pattern.
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pkScript := mustParseShortForm("HASH160 DATA_20 0x433ec2ac1ffa1b7b7d0" +
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"27f564529c57197f9ae88 EQUAL")
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for _, test := range tests {
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count := txscript.GetPreciseSigOpCount(test.scriptSig, pkScript,
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true)
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if count != test.nSigOps {
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t.Errorf("%s: expected count of %d, got %d", test.name,
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test.nSigOps, count)
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}
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}
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}
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// TestRemoveOpcodes ensures that removing opcodes from scripts behaves as
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// expected.
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func TestRemoveOpcodes(t *testing.T) {
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t.Parallel()
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tests := []struct {
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name string
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before string
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remove byte
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err error
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after string
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}{
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{
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// Nothing to remove.
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name: "nothing to remove",
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before: "NOP",
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remove: txscript.OP_CODESEPARATOR,
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after: "NOP",
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},
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{
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// Test basic opcode removal.
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name: "codeseparator 1",
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before: "NOP CODESEPARATOR TRUE",
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remove: txscript.OP_CODESEPARATOR,
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after: "NOP TRUE",
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},
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{
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// The opcode in question is actually part of the data
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// in a previous opcode.
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name: "codeseparator by coincidence",
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before: "NOP DATA_1 CODESEPARATOR TRUE",
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remove: txscript.OP_CODESEPARATOR,
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after: "NOP DATA_1 CODESEPARATOR TRUE",
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},
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{
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name: "invalid opcode",
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before: "CAT",
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remove: txscript.OP_CODESEPARATOR,
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after: "CAT",
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},
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{
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name: "invalid length (insruction)",
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before: "PUSHDATA1",
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remove: txscript.OP_CODESEPARATOR,
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err: txscript.ErrStackShortScript,
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},
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{
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name: "invalid length (data)",
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before: "PUSHDATA1 0xff 0xfe",
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remove: txscript.OP_CODESEPARATOR,
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err: txscript.ErrStackShortScript,
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},
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}
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for _, test := range tests {
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before := mustParseShortForm(test.before)
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after := mustParseShortForm(test.after)
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result, err := txscript.TstRemoveOpcode(before, test.remove)
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if test.err != nil {
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if err != test.err {
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t.Errorf("%s: got unexpected error. exp: \"%v\" "+
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"got: \"%v\"", test.name, test.err, err)
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}
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return
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}
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if err != nil {
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t.Errorf("%s: unexpected failure: \"%v\"", test.name, err)
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return
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}
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if !bytes.Equal(after, result) {
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t.Errorf("%s: value does not equal expected: exp: \"%v\""+
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" got: \"%v\"", test.name, after, result)
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}
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}
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}
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// TestRemoveOpcodeByData ensures that removing data carrying opcodes based on
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// the data they contain works as expected.
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func TestRemoveOpcodeByData(t *testing.T) {
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t.Parallel()
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tests := []struct {
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name string
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before []byte
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remove []byte
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err error
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after []byte
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}{
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{
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name: "nothing to do",
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before: []byte{txscript.OP_NOP},
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remove: []byte{1, 2, 3, 4},
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after: []byte{txscript.OP_NOP},
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},
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{
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name: "simple case",
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before: []byte{txscript.OP_DATA_4, 1, 2, 3, 4},
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remove: []byte{1, 2, 3, 4},
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after: nil,
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},
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{
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name: "simple case (miss)",
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before: []byte{txscript.OP_DATA_4, 1, 2, 3, 4},
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remove: []byte{1, 2, 3, 5},
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after: []byte{txscript.OP_DATA_4, 1, 2, 3, 4},
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},
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// fix to allow for decred tests too
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/*
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{
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name: "stakesubmission",
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scriptclass: txscript.StakeSubmissionTy,
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stringed: "stakesubmission",
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},
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{
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name: "stakegen",
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scriptclass: txscript.StakeGenTy,
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stringed: "stakegen",
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},
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{
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name: "stakerevoke",
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scriptclass: txscript.StakeRevocationTy,
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stringed: "stakerevoke",
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},
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*/
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{
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// padded to keep it canonical.
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name: "simple case (pushdata1)",
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before: append(append([]byte{txscript.OP_PUSHDATA1, 76},
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bytes.Repeat([]byte{0}, 72)...),
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[]byte{1, 2, 3, 4}...),
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remove: []byte{1, 2, 3, 4},
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after: nil,
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},
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{
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name: "simple case (pushdata1 miss)",
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before: append(append([]byte{txscript.OP_PUSHDATA1, 76},
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bytes.Repeat([]byte{0}, 72)...),
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[]byte{1, 2, 3, 4}...),
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remove: []byte{1, 2, 3, 5},
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after: append(append([]byte{txscript.OP_PUSHDATA1, 76},
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bytes.Repeat([]byte{0}, 72)...),
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[]byte{1, 2, 3, 4}...),
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},
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{
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name: "simple case (pushdata1 miss noncanonical)",
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before: []byte{txscript.OP_PUSHDATA1, 4, 1, 2, 3, 4},
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remove: []byte{1, 2, 3, 4},
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after: []byte{txscript.OP_PUSHDATA1, 4, 1, 2, 3, 4},
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},
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{
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name: "simple case (pushdata2)",
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before: append(append([]byte{txscript.OP_PUSHDATA2, 0, 1},
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bytes.Repeat([]byte{0}, 252)...),
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[]byte{1, 2, 3, 4}...),
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remove: []byte{1, 2, 3, 4},
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after: nil,
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},
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{
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name: "simple case (pushdata2 miss)",
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before: append(append([]byte{txscript.OP_PUSHDATA2, 0, 1},
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bytes.Repeat([]byte{0}, 252)...),
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[]byte{1, 2, 3, 4}...),
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remove: []byte{1, 2, 3, 4, 5},
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after: append(append([]byte{txscript.OP_PUSHDATA2, 0, 1},
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bytes.Repeat([]byte{0}, 252)...),
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[]byte{1, 2, 3, 4}...),
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},
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{
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name: "simple case (pushdata2 miss noncanonical)",
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before: []byte{txscript.OP_PUSHDATA2, 4, 0, 1, 2, 3, 4},
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remove: []byte{1, 2, 3, 4},
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after: []byte{txscript.OP_PUSHDATA2, 4, 0, 1, 2, 3, 4},
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},
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{
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// This is padded to make the push canonical.
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name: "simple case (pushdata4)",
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before: append(append([]byte{txscript.OP_PUSHDATA4, 0, 0, 1, 0},
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bytes.Repeat([]byte{0}, 65532)...),
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[]byte{1, 2, 3, 4}...),
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remove: []byte{1, 2, 3, 4},
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after: nil,
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},
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{
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name: "simple case (pushdata4 miss noncanonical)",
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before: []byte{txscript.OP_PUSHDATA4, 4, 0, 0, 0, 1, 2, 3, 4},
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remove: []byte{1, 2, 3, 4},
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after: []byte{txscript.OP_PUSHDATA4, 4, 0, 0, 0, 1, 2, 3, 4},
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},
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{
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// This is padded to make the push canonical.
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name: "simple case (pushdata4 miss)",
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before: append(append([]byte{txscript.OP_PUSHDATA4, 0, 0, 1, 0},
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bytes.Repeat([]byte{0}, 65532)...), []byte{1, 2, 3, 4}...),
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remove: []byte{1, 2, 3, 4, 5},
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after: append(append([]byte{txscript.OP_PUSHDATA4, 0, 0, 1, 0},
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bytes.Repeat([]byte{0}, 65532)...), []byte{1, 2, 3, 4}...),
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},
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{
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name: "invalid opcode ",
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before: []byte{txscript.OP_UNKNOWN193},
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remove: []byte{1, 2, 3, 4},
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after: []byte{txscript.OP_UNKNOWN193},
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},
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{
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name: "invalid length (instruction)",
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before: []byte{txscript.OP_PUSHDATA1},
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remove: []byte{1, 2, 3, 4},
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err: txscript.ErrStackShortScript,
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},
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{
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name: "invalid length (data)",
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before: []byte{txscript.OP_PUSHDATA1, 255, 254},
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remove: []byte{1, 2, 3, 4},
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err: txscript.ErrStackShortScript,
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},
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}
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for _, test := range tests {
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result, err := txscript.TstRemoveOpcodeByData(test.before,
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test.remove)
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if test.err != nil {
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if err != test.err {
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t.Errorf("%s: got unexpected error. exp: \"%v\" "+
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"got: \"%v\"", test.name, test.err, err)
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}
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return
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}
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if err != nil {
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t.Errorf("%s: unexpected failure: \"%v\"", test.name, err)
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return
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}
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if !bytes.Equal(test.after, result) {
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t.Errorf("%s: value does not equal expected: exp: \"%v\""+
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" got: \"%v\"", test.name, test.after, result)
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}
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}
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}
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// TestIsPayToScriptHash ensures the IsPayToScriptHash function returns the
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// expected results for all the scripts in scriptClassTests.
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func TestIsPayToScriptHash(t *testing.T) {
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t.Parallel()
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for _, test := range scriptClassTests {
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script := mustParseShortForm(test.script)
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shouldBe := (test.class == txscript.ScriptHashTy)
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p2sh := txscript.IsPayToScriptHash(script)
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if p2sh != shouldBe {
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t.Errorf("%s: epxected p2sh %v, got %v", test.name,
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shouldBe, p2sh)
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}
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}
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}
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|
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// TestHasCanonicalPushes ensures the canonicalPush function properly determines
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// what is considered a canonical push for the purposes of removeOpcodeByData.
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func TestHasCanonicalPushes(t *testing.T) {
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t.Parallel()
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|
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tests := []struct {
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name string
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script string
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expected bool
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}{
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{
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name: "does not parse",
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script: "0x046708afdb0fe5548271967f1a67130b7105cd6a82" +
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"8e03909a67962e0ea1f61d",
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expected: false,
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},
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{
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name: "non-canonical push",
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script: "PUSHDATA1 0x04 0x01020304",
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expected: false,
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},
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}
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for i, test := range tests {
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script := mustParseShortForm(test.script)
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pops, err := txscript.TstParseScript(script)
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if err != nil {
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if test.expected {
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t.Errorf("TstParseScript #%d failed: %v", i, err)
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}
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continue
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}
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for _, pop := range pops {
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if txscript.TstHasCanonicalPushes(pop) != test.expected {
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t.Errorf("TstHasCanonicalPushes: #%d (%s) "+
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"wrong result\ngot: %v\nwant: %v", i,
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test.name, true, test.expected)
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break
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}
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}
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}
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}
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|
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// TestIsPushOnlyScript ensures the IsPushOnlyScript function returns the
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// expected results.
|
|
func TestIsPushOnlyScript(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
test := struct {
|
|
name string
|
|
script []byte
|
|
expected bool
|
|
}{
|
|
name: "does not parse",
|
|
script: mustParseShortForm("0x046708afdb0fe5548271967f1a67130" +
|
|
"b7105cd6a828e03909a67962e0ea1f61d"),
|
|
expected: false,
|
|
}
|
|
|
|
if txscript.IsPushOnlyScript(test.script) != test.expected {
|
|
t.Errorf("IsPushOnlyScript (%s) wrong result\ngot: %v\nwant: "+
|
|
"%v", test.name, true, test.expected)
|
|
}
|
|
}
|
|
|
|
// TestCalcSignatureHash does some rudimentary testing of msg hash calculation.
|
|
func TestCalcSignatureHash(t *testing.T) {
|
|
tx := new(wire.MsgTx)
|
|
tx.SerType = wire.TxSerializeFull
|
|
tx.Version = 1
|
|
for i := 0; i < 3; i++ {
|
|
txIn := new(wire.TxIn)
|
|
txIn.Sequence = 0xFFFFFFFF
|
|
txIn.PreviousOutPoint.Hash = chainhash.HashH([]byte{byte(i)})
|
|
txIn.PreviousOutPoint.Index = uint32(i)
|
|
txIn.PreviousOutPoint.Tree = int8(0)
|
|
tx.AddTxIn(txIn)
|
|
}
|
|
for i := 0; i < 2; i++ {
|
|
txOut := new(wire.TxOut)
|
|
txOut.PkScript = []byte{0x01, 0x01, 0x02, 0x03}
|
|
txOut.Value = 0x0000FF00FF00FF00
|
|
tx.AddTxOut(txOut)
|
|
}
|
|
|
|
want, _ := hex.DecodeString("d09285b6f60c71329323bc2e76c48" +
|
|
"a462cde4e1032aa8f59c55823f1722c7f4a")
|
|
pops, _ := txscript.TstParseScript([]byte{0x01, 0x01, 0x02, 0x03})
|
|
|
|
// Test prefix caching.
|
|
msg1, err := txscript.CalcSignatureHash(pops, txscript.SigHashAll, tx, 0, nil)
|
|
if err != nil {
|
|
t.Fatalf("unexpected error %v", err.Error())
|
|
}
|
|
|
|
prefixHash := tx.TxHash()
|
|
msg2, err := txscript.CalcSignatureHash(pops, txscript.SigHashAll, tx, 0,
|
|
&prefixHash)
|
|
if err != nil {
|
|
t.Fatalf("unexpected error %v", err.Error())
|
|
}
|
|
|
|
if !bytes.Equal(msg1, want) {
|
|
t.Errorf("for sighash all sig noncached wrong msg %x given, want %x",
|
|
msg1,
|
|
want)
|
|
}
|
|
if !bytes.Equal(msg2, want) {
|
|
t.Errorf("for sighash all sig cached wrong msg %x given, want %x",
|
|
msg1,
|
|
want)
|
|
}
|
|
if !bytes.Equal(msg1, msg2) {
|
|
t.Errorf("for sighash all sig non-equivalent msgs %x and %x were "+
|
|
"returned when using a cached prefix",
|
|
msg1,
|
|
msg2)
|
|
}
|
|
|
|
// Move the index and make sure that we get a whole new hash, despite
|
|
// using the same TxOuts.
|
|
msg3, err := txscript.CalcSignatureHash(pops, txscript.SigHashAll, tx, 1,
|
|
&prefixHash)
|
|
if err != nil {
|
|
t.Fatalf("unexpected error %v", err.Error())
|
|
}
|
|
|
|
if bytes.Equal(msg1, msg3) {
|
|
t.Errorf("for sighash all sig equivalent msgs %x and %x were "+
|
|
"returned when using a cached prefix but different indices",
|
|
msg1,
|
|
msg3)
|
|
}
|
|
}
|
|
|
|
// TestIsUnspendable ensures the IsUnspendable function returns the expected
|
|
// results.
|
|
func TestIsUnspendable(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
tests := []struct {
|
|
name string
|
|
amount int64
|
|
pkScript []byte
|
|
expected bool
|
|
}{
|
|
{
|
|
// Unspendable
|
|
amount: 100,
|
|
pkScript: []byte{0x6a, 0x04, 0x74, 0x65, 0x73, 0x74},
|
|
expected: true,
|
|
},
|
|
{
|
|
// Unspendable
|
|
amount: 0,
|
|
pkScript: []byte{0x76, 0xa9, 0x14, 0x29, 0x95, 0xa0,
|
|
0xfe, 0x68, 0x43, 0xfa, 0x9b, 0x95, 0x45,
|
|
0x97, 0xf0, 0xdc, 0xa7, 0xa4, 0x4d, 0xf6,
|
|
0xfa, 0x0b, 0x5c, 0x88, 0xac},
|
|
expected: true,
|
|
},
|
|
{
|
|
// Spendable
|
|
amount: 100,
|
|
pkScript: []byte{0x76, 0xa9, 0x14, 0x29, 0x95, 0xa0,
|
|
0xfe, 0x68, 0x43, 0xfa, 0x9b, 0x95, 0x45,
|
|
0x97, 0xf0, 0xdc, 0xa7, 0xa4, 0x4d, 0xf6,
|
|
0xfa, 0x0b, 0x5c, 0x88, 0xac},
|
|
expected: false,
|
|
},
|
|
}
|
|
|
|
for i, test := range tests {
|
|
res := txscript.IsUnspendable(test.amount, test.pkScript)
|
|
if res != test.expected {
|
|
t.Errorf("TestIsUnspendable #%d failed: got %v want %v",
|
|
i, res, test.expected)
|
|
continue
|
|
}
|
|
}
|
|
}
|