Golang common.Hex2Bytes函數代碼示例

func TestBox(t *testing.T) {
	prv1 := ToECDSA(common.Hex2Bytes("4b50fa71f5c3eeb8fdc452224b2395af2fcc3d125e06c32c82e048c0559db03f"))
	prv2 := ToECDSA(common.Hex2Bytes("d0b043b4c5d657670778242d82d68a29d25d7d711127d17b8e299f156dad361a"))
	pub2 := ToECDSAPub(common.Hex2Bytes("04bd27a63c91fe3233c5777e6d3d7b39204d398c8f92655947eb5a373d46e1688f022a1632d264725cbc7dc43ee1cfebde42fa0a86d08b55d2acfbb5e9b3b48dc5"))

	message := []byte("Hello, world.")
	ct, err := Encrypt(pub2, message)
	if err != nil {
		fmt.Println(err.Error())
		t.FailNow()
	}

	pt, err := Decrypt(prv2, ct)
	if err != nil {
		fmt.Println(err.Error())
		t.FailNow()
	}

	if !bytes.Equal(pt, message) {
		fmt.Println("ecies: plaintext doesn't match message")
		t.FailNow()
	}

	_, err = Decrypt(prv1, pt)
	if err == nil {
		fmt.Println("ecies: encryption should not have succeeded")
		t.FailNow()
	}

}

func TestMultiReturnWithSlice(t *testing.T) {
	const definition = `[
	{ "name" : "multi", "constant" : false, "outputs": [ { "name": "Int", "type": "uint256" }, { "name": "String", "type": "string" } ] }]`

	abi, err := JSON(strings.NewReader(definition))
	if err != nil {
		t.Fatal(err)
	}

	// using buff to make the code readable
	buff := new(bytes.Buffer)
	buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
	buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040"))
	buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000005"))
	stringOut := "hello"
	buff.Write(common.RightPadBytes([]byte(stringOut), 32))

	var inter []interface{}
	err = abi.Unpack(&inter, "multi", buff.Bytes())
	if err != nil {
		t.Error(err)
	}

	if len(inter) != 2 {
		t.Fatal("expected 2 results got", len(inter))
	}

	if num, ok := inter[0].(*big.Int); !ok || num.Cmp(big.NewInt(1)) != 0 {
		t.Error("expected index 0 to be 1 got", num)
	}

	if str, ok := inter[1].(string); !ok || str != stringOut {
		t.Error("expected index 1 to be", stringOut, "got", str)
	}
}

func TestMultiReturnWithStruct(t *testing.T) {
	const definition = `[
	{ "name" : "multi", "constant" : false, "outputs": [ { "name": "Int", "type": "uint256" }, { "name": "String", "type": "string" } ] }]`

	abi, err := JSON(strings.NewReader(definition))
	if err != nil {
		t.Fatal(err)
	}

	// using buff to make the code readable
	buff := new(bytes.Buffer)
	buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
	buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040"))
	buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000005"))
	stringOut := "hello"
	buff.Write(common.RightPadBytes([]byte(stringOut), 32))

	var inter struct {
		Int    *big.Int
		String string
	}
	err = abi.Unpack(&inter, "multi", buff.Bytes())
	if err != nil {
		t.Error(err)
	}

	if inter.Int == nil || inter.Int.Cmp(big.NewInt(1)) != 0 {
		t.Error("expected Int to be 1 got", inter.Int)
	}

	if inter.String != stringOut {
		t.Error("expected String to be", stringOut, "got", inter.String)
	}

	var reversed struct {
		String string
		Int    *big.Int
	}

	err = abi.Unpack(&reversed, "multi", buff.Bytes())
	if err != nil {
		t.Error(err)
	}

	if reversed.Int == nil || reversed.Int.Cmp(big.NewInt(1)) != 0 {
		t.Error("expected Int to be 1 got", reversed.Int)
	}

	if reversed.String != stringOut {
		t.Error("expected String to be", stringOut, "got", reversed.String)
	}
}

func run(ctx *cli.Context) {
	vm.Debug = ctx.GlobalBool(DebugFlag.Name)
	vm.ForceJit = ctx.GlobalBool(ForceJitFlag.Name)
	vm.EnableJit = !ctx.GlobalBool(DisableJitFlag.Name)

	glog.SetToStderr(true)
	glog.SetV(ctx.GlobalInt(VerbosityFlag.Name))

	db, _ := ethdb.NewMemDatabase()
	statedb, _ := state.New(common.Hash{}, db)
	sender := statedb.CreateAccount(common.StringToAddress("sender"))
	receiver := statedb.CreateAccount(common.StringToAddress("receiver"))
	receiver.SetCode(common.Hex2Bytes(ctx.GlobalString(CodeFlag.Name)))

	vmenv := NewEnv(statedb, common.StringToAddress("evmuser"), common.Big(ctx.GlobalString(ValueFlag.Name)))

	tstart := time.Now()
	ret, e := vmenv.Call(
		sender,
		receiver.Address(),
		common.Hex2Bytes(ctx.GlobalString(InputFlag.Name)),
		common.Big(ctx.GlobalString(GasFlag.Name)),
		common.Big(ctx.GlobalString(PriceFlag.Name)),
		common.Big(ctx.GlobalString(ValueFlag.Name)),
	)
	vmdone := time.Since(tstart)

	if ctx.GlobalBool(DumpFlag.Name) {
		fmt.Println(string(statedb.Dump()))
	}
	vm.StdErrFormat(vmenv.StructLogs())

	if ctx.GlobalBool(SysStatFlag.Name) {
		var mem runtime.MemStats
		runtime.ReadMemStats(&mem)
		fmt.Printf("vm took %v\n", vmdone)
		fmt.Printf(`alloc:      %d
tot alloc:  %d
no. malloc: %d
heap alloc: %d
heap objs:  %d
num gc:     %d
`, mem.Alloc, mem.TotalAlloc, mem.Mallocs, mem.HeapAlloc, mem.HeapObjects, mem.NumGC)
	}

	fmt.Printf("OUT: 0x%x", ret)
	if e != nil {
		fmt.Printf(" error: %v", e)
	}
	fmt.Println()
}

// GenesisBlock creates a genesis block with the given nonce.
func GenesisBlock(nonce uint64, db common.Database) *types.Block {
	var accounts map[string]struct {
		Balance string
		Code    string
	}
	err := json.Unmarshal(GenesisAccounts, &accounts)
	if err != nil {
		fmt.Println("unable to decode genesis json data:", err)
		os.Exit(1)
	}
	statedb := state.New(common.Hash{}, db)
	for addr, account := range accounts {
		codedAddr := common.Hex2Bytes(addr)
		accountState := statedb.CreateAccount(common.BytesToAddress(codedAddr))
		accountState.SetBalance(common.Big(account.Balance))
		accountState.SetCode(common.FromHex(account.Code))
		statedb.UpdateStateObject(accountState)
	}
	statedb.Sync()

	block := types.NewBlock(&types.Header{
		Difficulty: params.GenesisDifficulty,
		GasLimit:   params.GenesisGasLimit,
		Nonce:      types.EncodeNonce(nonce),
		Root:       statedb.Root(),
	}, nil, nil, nil)
	block.Td = params.GenesisDifficulty
	return block
}

func (self *UiLib) ImportTx(rlpTx string) {
	tx := types.NewTransactionFromBytes(common.Hex2Bytes(rlpTx))
	err := self.eth.TxPool().Add(tx)
	if err != nil {
		guilogger.Infoln("import tx failed ", err)
	}
}

func (self *UiLib) ToAscii(data string) string {
	start := 0
	if len(data) > 1 && data[0:2] == "0x" {
		start = 2
	}
	return string(common.Hex2Bytes(data[start:]))
}

func Test0Key(t *testing.T) {
	key := common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000000")
	_, err := secp256k1.GeneratePubKey(key)
	if err == nil {
		t.Errorf("expected error due to zero privkey")
	}
}

func RunState(statedb *state.StateDB, env, tx map[string]string) ([]byte, state.Logs, *big.Int, error) {
	var (
		keyPair, _ = crypto.NewKeyPairFromSec([]byte(common.Hex2Bytes(tx["secretKey"])))
		data       = common.FromHex(tx["data"])
		gas        = common.Big(tx["gasLimit"])
		price      = common.Big(tx["gasPrice"])
		value      = common.Big(tx["value"])
		nonce      = common.Big(tx["nonce"]).Uint64()
		caddr      = common.HexToAddress(env["currentCoinbase"])
	)

	var to *common.Address
	if len(tx["to"]) > 2 {
		t := common.HexToAddress(tx["to"])
		to = &t
	}
	// Set pre compiled contracts
	vm.Precompiled = vm.PrecompiledContracts()

	snapshot := statedb.Copy()
	coinbase := statedb.GetOrNewStateObject(caddr)
	coinbase.SetGasLimit(common.Big(env["currentGasLimit"]))

	message := NewMessage(common.BytesToAddress(keyPair.Address()), to, data, value, gas, price, nonce)
	vmenv := NewEnvFromMap(statedb, env, tx)
	vmenv.origin = common.BytesToAddress(keyPair.Address())
	ret, _, err := core.ApplyMessage(vmenv, message, coinbase)
	if core.IsNonceErr(err) || core.IsInvalidTxErr(err) || state.IsGasLimitErr(err) {
		statedb.Set(snapshot)
	}
	statedb.Update()

	return ret, vmenv.state.Logs(), vmenv.Gas, err
}

func (self *Object) StorageString(str string) *common.Value {
	if common.IsHex(str) {
		return self.storage(common.Hex2Bytes(str[2:]))
	} else {
		return self.storage(common.RightPadBytes([]byte(str), 32))
	}
}

func FromHex(h string) []byte {
	if common.IsHex(h) {
		h = h[2:]
	}

	return common.Hex2Bytes(h)
}

func TestDelete(t *testing.T) {
	trie := NewEmpty()

	vals := []struct{ k, v string }{
		{"do", "verb"},
		{"ether", "wookiedoo"},
		{"horse", "stallion"},
		{"shaman", "horse"},
		{"doge", "coin"},
		{"ether", ""},
		{"dog", "puppy"},
		{"shaman", ""},
	}
	for _, val := range vals {
		if val.v != "" {
			trie.UpdateString(val.k, val.v)
		} else {
			trie.DeleteString(val.k)
		}
	}

	hash := trie.Hash()
	exp := common.Hex2Bytes("5991bb8c6514148a29db676a14ac506cd2cd5775ace63c30a4fe457715e9ac84")
	if !bytes.Equal(hash, exp) {
		t.Errorf("expected %x got %x", exp, hash)
	}
}

func TestSecureDelete(t *testing.T) {
	trie := NewEmptySecure()

	vals := []struct{ k, v string }{
		{"do", "verb"},
		{"ether", "wookiedoo"},
		{"horse", "stallion"},
		{"shaman", "horse"},
		{"doge", "coin"},
		{"ether", ""},
		{"dog", "puppy"},
		{"shaman", ""},
	}
	for _, val := range vals {
		if val.v != "" {
			trie.UpdateString(val.k, val.v)
		} else {
			trie.DeleteString(val.k)
		}
	}

	hash := trie.Hash()
	exp := common.Hex2Bytes("29b235a58c3c25ab83010c327d5932bcf05324b7d6b1185e650798034783ca9d")
	if !bytes.Equal(hash, exp) {
		t.Errorf("expected %x got %x", exp, hash)
	}
}

// HashToUrl(contenthash) resolves the url for contenthash using UrlHint
// resolution is costless non-transactional
// implemented as direct retrieval from  db
// if we use content addressed storage, this step is no longer necessary
func (self *Registrar) HashToUrl(chash common.Hash) (uri string, err error) {
	if zero.MatchString(UrlHintAddr) {
		return "", fmt.Errorf("UrlHint address is not set")
	}
	// look up in URL reg
	var str string = " "
	var idx uint32
	for len(str) > 0 {
		mapaddr := storageMapping(storageIdx2Addr(1), chash[:])
		key := storageAddress(storageFixedArray(mapaddr, storageIdx2Addr(idx)))
		hex := self.backend.StorageAt(UrlHintAddr[2:], key)
		str = string(common.Hex2Bytes(hex[2:]))
		l := 0
		for (l < len(str)) && (str[l] == 0) {
			l++
		}

		str = str[l:]
		uri = uri + str
		idx++
	}

	if len(uri) == 0 {
		err = fmt.Errorf("HashToUrl: URL hint not found for '%v'", chash.Hex())
	}
	return
}

func (self Log) Topics() [][]byte {
	t := make([][]byte, len(self.TopicsF))
	for i, topic := range self.TopicsF {
		t[i] = common.Hex2Bytes(topic)
	}
	return t
}