mirror of
https://github.com/FlipsideCrypto/dcrd.git
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f5dc86e9cc
This removes the ScriptVerifyMinimalData flag from the txscript package, changes the default semantics to always enforce its behavior, and updates all callers in the repository accordingly. This change is being made to simplify the script engine code since the flag has always been active and required by consensus in Decred, so there is no need to require a flag to conditionally toggle it. It should be noted that the tests removed from script_tests.json specifically dealt with ensuring equivalency of different ways to encode the same numbers when the ScriptVerifyMinimalData flag is not set. Therefore, they are no longer necessary. A few tests which dealt with equivalency that did not already have expected failing counterparts were converted to expected failure. Also, several of the tests which dealt with ensuring the specific encoding of numeric opcodes is being used have been converted to use hashes since the minimal data requirements specifically prevent alternate ways of pushing the same encoding which is necessary for directly checking equality of the raw bytes. Finally, the MINIMALDATA indicator to enable the flag in the test data has been retained for now in order to isolate the logic changes as much as possible.
567 lines
14 KiB
Go
567 lines
14 KiB
Go
// Copyright (c) 2013-2017 The btcsuite developers
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// Copyright (c) 2015-2018 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
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import (
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"bytes"
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"fmt"
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"math/rand"
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"strconv"
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"strings"
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"testing"
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"github.com/decred/dcrd/wire"
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)
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// testScriptFlags are the script flags which are used in the tests when
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// executing transaction scripts to enforce additional checks. Note these flags
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// are different than what is required for the consensus rules in that they are
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// more strict.
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const testScriptFlags = ScriptDiscourageUpgradableNops |
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ScriptVerifyCleanStack |
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ScriptVerifyCheckLockTimeVerify |
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ScriptVerifyCheckSequenceVerify |
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ScriptVerifySHA256
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// TestOpcodeDisabled tests the opcodeDisabled function manually because all
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// disabled opcodes result in a script execution failure when executed normally,
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// so the function is not called under normal circumstances.
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func TestOpcodeDisabled(t *testing.T) {
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t.Parallel()
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tests := []byte{OP_CAT, OP_SUBSTR, OP_LEFT, OP_RIGHT, OP_INVERT,
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OP_AND, OP_OR, OP_2MUL, OP_2DIV, OP_MUL, OP_DIV, OP_MOD,
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OP_LSHIFT, OP_RSHIFT,
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}
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for _, opcodeVal := range tests {
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pop := parsedOpcode{opcode: &opcodeArray[opcodeVal], data: nil}
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err := opcodeDisabled(&pop, nil)
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if !IsErrorCode(err, ErrDisabledOpcode) {
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t.Errorf("opcodeDisabled: unexpected error - got %v, "+
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"want %v", err, ErrDisabledOpcode)
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continue
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}
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}
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}
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// TestOpcodeDisasm tests the print function for all opcodes in both the oneline
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// and full modes to ensure it provides the expected disassembly.
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func TestOpcodeDisasm(t *testing.T) {
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t.Parallel()
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// First, test the oneline disassembly.
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// The expected strings for the data push opcodes are replaced in the
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// test loops below since they involve repeating bytes. Also, the
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// OP_NOP# and OP_UNKNOWN# are replaced below too, since it's easier
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// than manually listing them here.
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oneBytes := []byte{0x01}
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oneStr := "01"
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expectedStrings := [256]string{0x00: "0", 0x4f: "-1",
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0x50: "OP_RESERVED", 0x61: "OP_NOP", 0x62: "OP_VER",
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0x63: "OP_IF", 0x64: "OP_NOTIF", 0x65: "OP_VERIF",
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0x66: "OP_VERNOTIF", 0x67: "OP_ELSE", 0x68: "OP_ENDIF",
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0x69: "OP_VERIFY", 0x6a: "OP_RETURN", 0x6b: "OP_TOALTSTACK",
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0x6c: "OP_FROMALTSTACK", 0x6d: "OP_2DROP", 0x6e: "OP_2DUP",
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0x6f: "OP_3DUP", 0x70: "OP_2OVER", 0x71: "OP_2ROT",
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0x72: "OP_2SWAP", 0x73: "OP_IFDUP", 0x74: "OP_DEPTH",
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0x75: "OP_DROP", 0x76: "OP_DUP", 0x77: "OP_NIP",
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0x78: "OP_OVER", 0x79: "OP_PICK", 0x7a: "OP_ROLL",
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0x7b: "OP_ROT", 0x7c: "OP_SWAP", 0x7d: "OP_TUCK",
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0x7e: "OP_CAT", 0x7f: "OP_SUBSTR", 0x80: "OP_LEFT",
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0x81: "OP_RIGHT", 0x82: "OP_SIZE", 0x83: "OP_INVERT",
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0x84: "OP_AND", 0x85: "OP_OR", 0x86: "OP_XOR",
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0x87: "OP_EQUAL", 0x88: "OP_EQUALVERIFY", 0x89: "OP_ROTR",
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0x8a: "OP_ROTL", 0x8b: "OP_1ADD", 0x8c: "OP_1SUB",
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0x8d: "OP_2MUL", 0x8e: "OP_2DIV", 0x8f: "OP_NEGATE",
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0x90: "OP_ABS", 0x91: "OP_NOT", 0x92: "OP_0NOTEQUAL",
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0x93: "OP_ADD", 0x94: "OP_SUB", 0x95: "OP_MUL", 0x96: "OP_DIV",
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0x97: "OP_MOD", 0x98: "OP_LSHIFT", 0x99: "OP_RSHIFT",
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0x9a: "OP_BOOLAND", 0x9b: "OP_BOOLOR", 0x9c: "OP_NUMEQUAL",
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0x9d: "OP_NUMEQUALVERIFY", 0x9e: "OP_NUMNOTEQUAL",
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0x9f: "OP_LESSTHAN", 0xa0: "OP_GREATERTHAN",
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0xa1: "OP_LESSTHANOREQUAL", 0xa2: "OP_GREATERTHANOREQUAL",
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0xa3: "OP_MIN", 0xa4: "OP_MAX", 0xa5: "OP_WITHIN",
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0xa6: "OP_RIPEMD160", 0xa7: "OP_SHA1", 0xa8: "OP_BLAKE256",
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0xa9: "OP_HASH160", 0xaa: "OP_HASH256", 0xab: "OP_CODESEPARATOR",
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0xac: "OP_CHECKSIG", 0xad: "OP_CHECKSIGVERIFY",
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0xae: "OP_CHECKMULTISIG", 0xaf: "OP_CHECKMULTISIGVERIFY",
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0xf9: "OP_INVALID249", 0xfa: "OP_SMALLINTEGER",
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0xfb: "OP_PUBKEYS", 0xfd: "OP_PUBKEYHASH", 0xfe: "OP_PUBKEY",
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0xff: "OP_INVALIDOPCODE", 0xba: "OP_SSTX", 0xbb: "OP_SSGEN",
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0xbc: "OP_SSRTX", 0xbd: "OP_SSTXCHANGE", 0xbe: "OP_CHECKSIGALT",
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0xbf: "OP_CHECKSIGALTVERIFY", 0xc0: "OP_SHA256",
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}
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for opcodeVal, expectedStr := range expectedStrings {
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var data []byte
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switch {
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// OP_DATA_1 through OP_DATA_65 display the pushed data.
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case opcodeVal >= 0x01 && opcodeVal < 0x4c:
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data = bytes.Repeat(oneBytes, opcodeVal)
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expectedStr = strings.Repeat(oneStr, opcodeVal)
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// OP_PUSHDATA1.
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case opcodeVal == 0x4c:
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data = bytes.Repeat(oneBytes, 1)
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expectedStr = strings.Repeat(oneStr, 1)
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// OP_PUSHDATA2.
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case opcodeVal == 0x4d:
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data = bytes.Repeat(oneBytes, 2)
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expectedStr = strings.Repeat(oneStr, 2)
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// OP_PUSHDATA4.
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case opcodeVal == 0x4e:
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data = bytes.Repeat(oneBytes, 3)
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expectedStr = strings.Repeat(oneStr, 3)
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// OP_1 through OP_16 display the numbers themselves.
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case opcodeVal >= 0x51 && opcodeVal <= 0x60:
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val := byte(opcodeVal - (0x51 - 1))
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data = []byte{val}
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expectedStr = strconv.Itoa(int(val))
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// OP_NOP1 through OP_NOP10.
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case opcodeVal >= 0xb0 && opcodeVal <= 0xb9:
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switch opcodeVal {
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case 0xb1:
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// OP_NOP2 is an alias of OP_CHECKLOCKTIMEVERIFY
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expectedStr = "OP_CHECKLOCKTIMEVERIFY"
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case 0xb2:
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// OP_NOP3 is an alias of OP_CHECKSEQUENCEVERIFY
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expectedStr = "OP_CHECKSEQUENCEVERIFY"
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default:
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val := byte(opcodeVal - (0xb0 - 1))
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expectedStr = "OP_NOP" + strconv.Itoa(int(val))
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}
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// OP_UNKNOWN#.
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case opcodeVal >= 0xc1 && opcodeVal <= 0xf8 || opcodeVal == 0xfc:
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expectedStr = "OP_UNKNOWN" + strconv.Itoa(int(opcodeVal))
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}
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pop := parsedOpcode{opcode: &opcodeArray[opcodeVal], data: data}
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gotStr := pop.print(true)
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if gotStr != expectedStr {
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t.Errorf("pop.print (opcode %x): Unexpected disasm "+
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"string - got %v, want %v", opcodeVal, gotStr,
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expectedStr)
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continue
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}
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}
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// Now, replace the relevant fields and test the full disassembly.
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expectedStrings[0x00] = "OP_0"
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expectedStrings[0x4f] = "OP_1NEGATE"
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for opcodeVal, expectedStr := range expectedStrings {
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var data []byte
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switch {
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// OP_DATA_1 through OP_DATA_65 display the opcode followed by
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// the pushed data.
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case opcodeVal >= 0x01 && opcodeVal < 0x4c:
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data = bytes.Repeat(oneBytes, opcodeVal)
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expectedStr = fmt.Sprintf("OP_DATA_%d 0x%s", opcodeVal,
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strings.Repeat(oneStr, opcodeVal))
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// OP_PUSHDATA1.
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case opcodeVal == 0x4c:
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data = bytes.Repeat(oneBytes, 1)
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expectedStr = fmt.Sprintf("OP_PUSHDATA1 0x%02x 0x%s",
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len(data), strings.Repeat(oneStr, 1))
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// OP_PUSHDATA2.
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case opcodeVal == 0x4d:
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data = bytes.Repeat(oneBytes, 2)
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expectedStr = fmt.Sprintf("OP_PUSHDATA2 0x%04x 0x%s",
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len(data), strings.Repeat(oneStr, 2))
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// OP_PUSHDATA4.
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case opcodeVal == 0x4e:
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data = bytes.Repeat(oneBytes, 3)
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expectedStr = fmt.Sprintf("OP_PUSHDATA4 0x%08x 0x%s",
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len(data), strings.Repeat(oneStr, 3))
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// OP_1 through OP_16.
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case opcodeVal >= 0x51 && opcodeVal <= 0x60:
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val := byte(opcodeVal - (0x51 - 1))
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data = []byte{val}
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expectedStr = "OP_" + strconv.Itoa(int(val))
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// OP_NOP1 through OP_NOP10.
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case opcodeVal >= 0xb0 && opcodeVal <= 0xb9:
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switch opcodeVal {
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case 0xb1:
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// OP_NOP2 is an alias of OP_CHECKLOCKTIMEVERIFY
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expectedStr = "OP_CHECKLOCKTIMEVERIFY"
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case 0xb2:
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// OP_NOP3 is an alias of OP_CHECKSEQUENCEVERIFY
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expectedStr = "OP_CHECKSEQUENCEVERIFY"
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default:
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val := byte(opcodeVal - (0xb0 - 1))
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expectedStr = "OP_NOP" + strconv.Itoa(int(val))
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}
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// OP_UNKNOWN#.
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case opcodeVal >= 0xc1 && opcodeVal <= 0xf8 || opcodeVal == 0xfc:
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expectedStr = "OP_UNKNOWN" + strconv.Itoa(int(opcodeVal))
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}
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pop := parsedOpcode{opcode: &opcodeArray[opcodeVal], data: data}
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gotStr := pop.print(false)
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if gotStr != expectedStr {
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t.Errorf("pop.print (opcode %x): Unexpected disasm "+
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"string - got %v, want %v", opcodeVal, gotStr,
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expectedStr)
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continue
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}
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}
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}
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func TestNewlyEnabledOpCodes(t *testing.T) {
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sigScriptMath := []byte{
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0x04,
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0xff, 0xff, 0xff, 0x7f,
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0x04,
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0xee, 0xee, 0xee, 0x6e,
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}
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sigScriptShift := []byte{
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0x04,
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0xff, 0xff, 0xff, 0x7f,
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0x53,
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}
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sigScriptRot := []byte{
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0x04,
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0x21, 0x12, 0x34, 0x56,
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0x53,
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}
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sigScriptInv := []byte{
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0x04,
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0xff, 0x00, 0xf0, 0x0f,
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}
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sigScriptLogic := []byte{
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0x04,
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0x21, 0x12, 0x34, 0x56,
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0x04,
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0x0f, 0xf0, 0x00, 0xff,
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}
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sigScriptCat := []byte{
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0x06,
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0x21, 0x12, 0x34, 0x56, 0x44, 0x55,
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0x06,
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0x0f, 0xf0, 0x00, 0xff, 0x88, 0x99,
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}
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lotsOf01s := bytes.Repeat([]byte{0x01}, 2050)
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builder := NewScriptBuilder()
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builder.AddData(lotsOf01s).AddData(lotsOf01s)
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sigScriptCatOverflow, _ := builder.Script()
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sigScriptSubstr := []byte{
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0x08,
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0x21, 0x12, 0x34, 0x56, 0x59, 0x32, 0x40, 0x21,
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0x56,
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0x52,
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}
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sigScriptLR := []byte{
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0x08,
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0x21, 0x12, 0x34, 0x56, 0x59, 0x32, 0x40, 0x21,
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0x54,
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}
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tests := []struct {
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name string
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pkScript []byte
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sigScript []byte
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expected bool
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}{
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{
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name: "add",
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pkScript: []byte{
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0x93, // OP_ADD
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0x05, // Expected result push
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0xed, 0xee, 0xee, 0xee, 0x00,
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0x87, // OP_EQUAL
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},
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sigScript: sigScriptMath,
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expected: true,
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},
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{
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name: "sub",
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pkScript: []byte{
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0x94, // OP_SUB
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0x04, // Expected result push
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0x11, 0x11, 0x11, 0x11,
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0x87, // OP_EQUAL
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},
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sigScript: sigScriptMath,
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expected: true,
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},
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{
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name: "mul",
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pkScript: []byte{
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0x95, // OP_MUL
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0x04, // Expected result push
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0xee, 0xee, 0xee, 0xee,
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0x87, // OP_EQUAL
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},
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sigScript: sigScriptMath,
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expected: true,
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},
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{
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name: "div",
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pkScript: []byte{
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0x96, // OP_DIV
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0x51, // Expected result push
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0x87, // OP_EQUAL
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},
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sigScript: sigScriptMath,
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expected: true,
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},
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{
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name: "mod",
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pkScript: []byte{
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0x97, // OP_MOD
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0x04, // Expected result push
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0x11, 0x11, 0x11, 0x11,
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0x87, // OP_EQUAL
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},
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sigScript: sigScriptMath,
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expected: true,
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},
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{
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name: "lshift",
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pkScript: []byte{
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0x98, // OP_LSHIFT
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0x01, // Expected result push
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0x88,
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0x87, // OP_EQUAL
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},
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sigScript: sigScriptShift,
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expected: true,
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},
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{
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name: "rshift",
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pkScript: []byte{
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0x99, // OP_RSHIFT
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0x04, // Expected result push
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0xff, 0xff, 0xff, 0x0f,
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0x87, // OP_EQUAL
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},
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sigScript: sigScriptShift,
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expected: true,
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},
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{
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name: "rotr",
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pkScript: []byte{
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0x89, // OP_ROTR
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0x04, // Expected result push
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0x44, 0x82, 0xc6, 0x2a,
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0x87, // OP_EQUAL
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},
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sigScript: sigScriptRot,
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expected: true,
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},
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{
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name: "rotl",
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pkScript: []byte{
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0x8a, // OP_ROTL
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0x04, // Expected result push
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0xf6, 0x6e, 0x5f, 0xce,
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0x87, // OP_EQUAL
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},
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sigScript: sigScriptRot,
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expected: true,
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},
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{
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name: "inv",
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pkScript: []byte{
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0x83, // OP_INV
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0x04, // Expected result push
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0x00, 0x01, 0xf0, 0x8f,
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0x87, // OP_EQUAL
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},
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sigScript: sigScriptInv,
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expected: true,
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},
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{
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name: "and",
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pkScript: []byte{
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0x84, // OP_AND
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0x03, // Expected result push
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0x21, 0x02, 0x34,
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0x87, // OP_EQUAL
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},
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sigScript: sigScriptLogic,
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expected: true,
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},
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{
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name: "or",
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pkScript: []byte{
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0x85, // OP_OR
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0x04, // Expected result push
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0x0f, 0xe0, 0x00, 0xa9,
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0x87, // OP_EQUAL
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},
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sigScript: sigScriptLogic,
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expected: true,
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},
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{
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name: "xor",
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pkScript: []byte{
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0x86, // OP_XOR
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0x04, // Expected result push
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0x30, 0xe2, 0x34, 0xa9,
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0x87, // OP_EQUAL
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},
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sigScript: sigScriptLogic,
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expected: true,
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},
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{
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name: "cat",
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pkScript: []byte{
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0x7e, // OP_CAT
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0x0c, // Expected result push
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0x21, 0x12, 0x34, 0x56, 0x44, 0x55,
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0x0f, 0xf0, 0x00, 0xff, 0x88, 0x99,
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0x87, // OP_EQUAL
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},
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sigScript: sigScriptCat,
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expected: true,
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},
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{
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name: "catoverflow",
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pkScript: []byte{
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0x7e, // OP_CAT
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0x0c, // Expected result push
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0x21, 0x12, 0x34, 0x56, 0x44, 0x55,
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0x0f, 0xf0, 0x00, 0xff, 0x88, 0x99,
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0x87, // OP_EQUAL
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},
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sigScript: sigScriptCatOverflow,
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expected: false,
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},
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{
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name: "substr",
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pkScript: []byte{
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0x7f, // OP_SUBSTR
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0x04, // Expected result push
|
|
0x34, 0x56, 0x59, 0x32,
|
|
0x87, // OP_EQUAL
|
|
},
|
|
sigScript: sigScriptSubstr,
|
|
expected: true,
|
|
},
|
|
{
|
|
name: "left",
|
|
pkScript: []byte{
|
|
0x80, // OP_LEFT
|
|
0x04, // Expected result push
|
|
0x21, 0x12, 0x34, 0x56,
|
|
0x87, // OP_EQUAL
|
|
},
|
|
sigScript: sigScriptLR,
|
|
expected: true,
|
|
},
|
|
{
|
|
name: "right",
|
|
pkScript: []byte{
|
|
0x81, // OP_RIGHT
|
|
0x04, // Expected result push
|
|
0x59, 0x32, 0x40, 0x21,
|
|
0x87, // OP_EQUAL
|
|
},
|
|
sigScript: sigScriptLR,
|
|
expected: true,
|
|
},
|
|
}
|
|
|
|
for _, test := range tests {
|
|
msgTx := new(wire.MsgTx)
|
|
msgTx.AddTxIn(&wire.TxIn{
|
|
PreviousOutPoint: wire.OutPoint{},
|
|
SignatureScript: test.sigScript,
|
|
Sequence: 0xFFFFFFFF,
|
|
})
|
|
msgTx.AddTxOut(&wire.TxOut{
|
|
Value: 0x00FFFFFF00000000,
|
|
PkScript: []byte{0x01},
|
|
})
|
|
engine, err := NewEngine(test.pkScript, msgTx, 0,
|
|
testScriptFlags, 0, nil)
|
|
if err != nil {
|
|
t.Errorf("Bad script result for test %v because of error: %v",
|
|
test.name, err.Error())
|
|
continue
|
|
}
|
|
err = engine.Execute()
|
|
if err != nil && test.expected {
|
|
t.Errorf("Bad script exec for test %v because of error: %v",
|
|
test.name, err.Error())
|
|
}
|
|
}
|
|
}
|
|
|
|
func randByteSliceSlice(i int, maxLen int, src int) [][]byte {
|
|
r := rand.New(rand.NewSource(int64(src)))
|
|
|
|
slices := make([][]byte, i)
|
|
for j := 0; j < i; j++ {
|
|
for {
|
|
sz := r.Intn(maxLen) + 1
|
|
|
|
sl := make([]byte, sz)
|
|
for k := 0; k < sz; k++ {
|
|
randByte := r.Intn(255)
|
|
sl[k] = uint8(randByte)
|
|
}
|
|
|
|
// No duplicates allowed.
|
|
if j > 0 &&
|
|
(bytes.Equal(sl, slices[j-1])) {
|
|
r.Seed(int64(j) + r.Int63n(12345))
|
|
continue
|
|
}
|
|
|
|
slices[j] = sl
|
|
break
|
|
}
|
|
}
|
|
|
|
return slices
|
|
}
|
|
|
|
// TestForVMFailure feeds random scripts to the VMs to check and see if it
|
|
// crashes. Try increasing the number of iterations or the length of the
|
|
// byte string to sample a greater space.
|
|
func TestForVMFailure(t *testing.T) {
|
|
numTests := 2
|
|
bsLength := 11
|
|
|
|
for i := 0; i < numTests; i++ {
|
|
tests := randByteSliceSlice(65536, bsLength, i)
|
|
|
|
for j := range tests {
|
|
if j == 0 {
|
|
continue
|
|
}
|
|
|
|
msgTx := new(wire.MsgTx)
|
|
msgTx.AddTxIn(&wire.TxIn{
|
|
PreviousOutPoint: wire.OutPoint{},
|
|
SignatureScript: tests[j-1],
|
|
Sequence: 0xFFFFFFFF,
|
|
})
|
|
msgTx.AddTxOut(&wire.TxOut{
|
|
Value: 0x00FFFFFF00000000,
|
|
PkScript: []byte{0x01},
|
|
})
|
|
engine, err := NewEngine(tests[j], msgTx, 0,
|
|
testScriptFlags, 0, nil)
|
|
|
|
if err == nil {
|
|
engine.Execute()
|
|
}
|
|
}
|
|
}
|
|
}
|