smartcontract: define parameter lengths as constants and use them

pkg/compiler/interop_test.go

@@ -45,7 +45,7 @@ func TestTypeConstantSize(t *testing.T) {
 
 	t.Run("Hash160", func(t *testing.T) {
 		t.Run("good", func(t *testing.T) {
-			a := make(cinterop.Hash160, 20)
+			a := make(cinterop.Hash160, smartcontract.Hash160Len)
 			src := fmt.Sprintf(src, a, a)
 			eval(t, src, []byte(a))
 		})
@@ -58,7 +58,7 @@ func TestTypeConstantSize(t *testing.T) {
 	})
 	t.Run("Hash256", func(t *testing.T) {
 		t.Run("good", func(t *testing.T) {
-			a := make(cinterop.Hash256, 32)
+			a := make(cinterop.Hash256, smartcontract.Hash256Len)
 			src := fmt.Sprintf(src, a, a)
 			eval(t, src, []byte(a))
 		})

pkg/compiler/syscall_test.go

@@ -15,6 +15,7 @@ import (
 	istorage "github.com/nspcc-dev/neo-go/pkg/core/interop/storage"
 	"github.com/nspcc-dev/neo-go/pkg/interop/contract"
 	"github.com/nspcc-dev/neo-go/pkg/interop/storage"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
 	"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
 	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/nspcc-dev/neo-go/pkg/vm"
@@ -488,6 +489,6 @@ func TestInteropTypesComparison(t *testing.T) {
 	}
 	typeCheck(t, "Hash160", util.Uint160Size)
 	typeCheck(t, "Hash256", util.Uint256Size)
-	typeCheck(t, "Signature", 64)
+	typeCheck(t, "Signature", smartcontract.SignatureLen)
-	typeCheck(t, "PublicKey", 33)
+	typeCheck(t, "PublicKey", smartcontract.PublicKeyLen)
 }

pkg/smartcontract/param_type.go

@@ -38,6 +38,14 @@ const (
 	VoidType             ParamType = 0xff
 )
 
+// Lengths (in bytes) of fixed-size types.
+const (
+	Hash160Len   = util.Uint160Size
+	Hash256Len   = util.Uint256Size
+	PublicKeyLen = 33
+	SignatureLen = keys.SignatureLen
+)
+
 // fileBytesParamType is a string representation of `filebytes` parameter type used in cli.
 const fileBytesParamType string = "filebytes"
 
@@ -151,7 +159,7 @@ func (pt *ParamType) DecodeBinary(r *io.BinReader) {
 // public key is represented by 33-byte value while 32 bytes are used for integer
 // and a simple push+convert is used for boolean. Other types produce no code at all.
 func (pt ParamType) EncodeDefaultValue(w *io.BinWriter) {
-	var b [64]byte
+	var b [SignatureLen]byte
 
 	switch pt {
 	case AnyType, SignatureType, StringType, ByteArrayType:
@@ -161,11 +169,11 @@ func (pt ParamType) EncodeDefaultValue(w *io.BinWriter) {
 	case IntegerType:
 		emit.Instruction(w, opcode.PUSHINT256, b[:32])
 	case Hash160Type:
-		emit.Bytes(w, b[:20])
+		emit.Bytes(w, b[:Hash160Len])
 	case Hash256Type:
-		emit.Bytes(w, b[:32])
+		emit.Bytes(w, b[:Hash256Len])
 	case PublicKeyType:
-		emit.Bytes(w, b[:33])
+		emit.Bytes(w, b[:PublicKeyLen])
 	case ArrayType, MapType, InteropInterfaceType, VoidType:
 	}
 }
@@ -198,13 +206,13 @@ func (pt ParamType) Match(v stackitem.Item) bool {
 	case ByteArrayType, StringType:
 		return vt == stackitem.ByteArrayT || vt == stackitem.BufferT || vt == stackitem.AnyT
 	case Hash160Type:
-		return checkBytesWithLen(vt, v, 20)
+		return checkBytesWithLen(vt, v, Hash160Len)
 	case Hash256Type:
-		return checkBytesWithLen(vt, v, 32)
+		return checkBytesWithLen(vt, v, Hash256Len)
 	case PublicKeyType:
-		return checkBytesWithLen(vt, v, 33)
+		return checkBytesWithLen(vt, v, PublicKeyLen)
 	case SignatureType:
-		return checkBytesWithLen(vt, v, 64)
+		return checkBytesWithLen(vt, v, SignatureLen)
 	case ArrayType:
 		return vt == stackitem.AnyT || vt == stackitem.ArrayT || vt == stackitem.StructT
 	case MapType:
@@ -274,7 +282,7 @@ func adjustValToType(typ ParamType, val string) (interface{}, error) {
 		if err != nil {
 			return nil, err
 		}
-		if len(b) != 64 {
+		if len(b) != SignatureLen {
 			return nil, errors.New("not a signature")
 		}
 		return b, nil
@@ -356,11 +364,11 @@ func inferParamType(val string) ParamType {
 	unhexed, err := hex.DecodeString(val)
 	if err == nil {
 		switch len(unhexed) {
-		case 20:
+		case Hash160Len:
 			return Hash160Type
-		case 32:
+		case Hash256Len:
 			return Hash256Type
-		case 64:
+		case SignatureLen:
 			return SignatureType
 		default:
 			return ByteArrayType

pkg/smartcontract/param_type_test.go

@@ -458,9 +458,9 @@ func TestParamTypeMatch(t *testing.T) {
 		stackitem.Make(util.Uint256{}.BytesBE()):   Hash256Type,
 		stackitem.Null{}:                           Hash160Type,
 		stackitem.Null{}:                           Hash256Type,
-		stackitem.Make(make([]byte, 33)):         PublicKeyType,
+		stackitem.Make(make([]byte, PublicKeyLen)): PublicKeyType,
 		stackitem.Null{}:                           PublicKeyType,
-		stackitem.Make(make([]byte, 64)):         SignatureType,
+		stackitem.Make(make([]byte, SignatureLen)): SignatureType,
 		stackitem.Null{}:                           SignatureType,
 		stackitem.Make([]stackitem.Item{}):         ArrayType,
 		stackitem.NewStruct([]stackitem.Item{}):    ArrayType,