native: implement CryptoLib contract

pkg/compiler/native_test.go

@@ -9,6 +9,7 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/core/interop"
 	"github.com/nspcc-dev/neo-go/pkg/core/interop/interopnames"
 	"github.com/nspcc-dev/neo-go/pkg/core/native"
+	"github.com/nspcc-dev/neo-go/pkg/interop/native/crypto"
 	"github.com/nspcc-dev/neo-go/pkg/interop/native/gas"
 	"github.com/nspcc-dev/neo-go/pkg/interop/native/ledger"
 	"github.com/nspcc-dev/neo-go/pkg/interop/native/management"
@@ -37,6 +38,7 @@ func TestContractHashes(t *testing.T) {
 	require.Equal(t, []byte(ledger.Hash), cs.Ledger.Hash.BytesBE())
 	require.Equal(t, []byte(management.Hash), cs.Management.Hash.BytesBE())
 	require.Equal(t, []byte(notary.Hash), cs.Notary.Hash.BytesBE())
+	require.Equal(t, []byte(crypto.Hash), cs.Crypto.Hash.BytesBE())
 }
 
 // testPrintHash is a helper for updating contract hashes.
@@ -77,6 +79,11 @@ func TestNameServiceRecordType(t *testing.T) {
 	require.EqualValues(t, native.RecordTypeAAAA, nameservice.TypeAAAA)
 }
 
+func TestCryptoLibNamedCurve(t *testing.T) {
+	require.EqualValues(t, native.Secp256k1, crypto.Secp256k1)
+	require.EqualValues(t, native.Secp256r1, crypto.Secp256r1)
+}
+
 type nativeTestCase struct {
 	method string
 	params []string
@@ -88,6 +95,7 @@ func TestNativeHelpersCompile(t *testing.T) {
 	u160 := `interop.Hash160("aaaaaaaaaaaaaaaaaaaa")`
 	u256 := `interop.Hash256("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")`
 	pub := `interop.PublicKey("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")`
+	sig := `interop.Signature("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")`
 	nep17TestCases := []nativeTestCase{
 		{"balanceOf", []string{u160}},
 		{"decimals", nil},
@@ -176,6 +184,11 @@ func TestNativeHelpersCompile(t *testing.T) {
 		{"update", []string{"nil", "nil"}},
 		{"updateWithData", []string{"nil", "nil", "123"}},
 	})
+	runNativeTestCases(t, cs.Crypto.ContractMD, "crypto", []nativeTestCase{
+		{"sha256", []string{"[]byte{1, 2, 3}"}},
+		{"ripemd160", []string{"[]byte{1, 2, 3}"}},
+		{"verifyWithECDsa", []string{"[]byte{1, 2, 3}", pub, sig, "crypto.Secp256k1"}},
+	})
 }
 
 func runNativeTestCases(t *testing.T, ctr interop.ContractMD, name string, testCases []nativeTestCase) {

pkg/compiler/syscall_test.go

@@ -103,8 +103,6 @@ func TestSyscallExecution(t *testing.T) {
 		"crypto.ECDsaSecp256k1Verify":        {interopnames.NeoCryptoVerifyWithECDsaSecp256k1, []string{b, pub, sig}, false},
 		"crypto.ECDSASecp256r1CheckMultisig": {interopnames.NeoCryptoCheckMultisigWithECDsaSecp256r1, []string{b, pubs, sigs}, false},
 		"crypto.ECDSASecp256k1CheckMultisig": {interopnames.NeoCryptoCheckMultisigWithECDsaSecp256k1, []string{b, pubs, sigs}, false},
-		"crypto.SHA256":                      {interopnames.NeoCryptoSHA256, []string{b}, false},
-		"crypto.RIPEMD160":                   {interopnames.NeoCryptoRIPEMD160, []string{b}, false},
 	}
 	ic := &interop.Context{}
 	core.SpawnVM(ic) // set Functions field

pkg/compiler/util_test.go

@@ -1,34 +0,0 @@
-package compiler_test
-
-import (
-	"testing"
-
-	"github.com/nspcc-dev/neo-go/pkg/core/interop"
-	"github.com/nspcc-dev/neo-go/pkg/core/interop/crypto"
-	"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
-	"github.com/stretchr/testify/require"
-)
-
-func TestSHA256(t *testing.T) {
-	src := `
-		package foo
-		 import (
-			"github.com/nspcc-dev/neo-go/pkg/interop/crypto"
-		 )
-		func Main() []byte {
-			src := []byte{0x97}
-			hash := crypto.SHA256(src)
-			return hash
-		}
-	`
-	v := vmAndCompile(t, src)
-	ic := &interop.Context{Trigger: trigger.Verification}
-	ic.VM = v
-	crypto.Register(ic)
-	v.SyscallHandler = ic.SyscallHandler
-	require.NoError(t, v.Run())
-	require.True(t, v.Estack().Len() >= 1)
-
-	h := []byte{0x2a, 0xa, 0xb7, 0x32, 0xb4, 0xe9, 0xd8, 0x5e, 0xf7, 0xdc, 0x25, 0x30, 0x3b, 0x64, 0xab, 0x52, 0x7c, 0x25, 0xa4, 0xd7, 0x78, 0x15, 0xeb, 0xb5, 0x79, 0xf3, 0x96, 0xec, 0x6c, 0xac, 0xca, 0xd3}
-	require.Equal(t, h, v.PopResult())
-}

pkg/core/interop/crypto/hash.go

@@ -1,39 +0,0 @@
-package crypto
-
-import (
-	"github.com/nspcc-dev/neo-go/pkg/core/interop"
-	"github.com/nspcc-dev/neo-go/pkg/crypto"
-	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
-	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
-)
-
-// Sha256 returns sha256 hash of the data.
-func Sha256(ic *interop.Context) error {
-	h, err := getMessageHash(ic, ic.VM.Estack().Pop().Item())
-	if err != nil {
-		return err
-	}
-	ic.VM.Estack().PushVal(h.BytesBE())
-	return nil
-}
-
-// RipeMD160 returns RipeMD160 hash of the data.
-func RipeMD160(ic *interop.Context) error {
-	var msg []byte
-
-	item := ic.VM.Estack().Pop().Item()
-	switch val := item.(type) {
-	case *stackitem.Interop:
-		msg = val.Value().(crypto.Verifiable).GetSignedPart()
-	case stackitem.Null:
-		msg = ic.Container.GetSignedPart()
-	default:
-		var err error
-		if msg, err = val.TryBytes(); err != nil {
-			return err
-		}
-	}
-	h := hash.RipeMD160(msg).BytesBE()
-	ic.VM.Estack().PushVal(h)
-	return nil
-}

pkg/core/interop/crypto/hash_test.go

@@ -1,69 +0,0 @@
-package crypto
-
-import (
-	"encoding/hex"
-	"testing"
-
-	"github.com/nspcc-dev/neo-go/pkg/core/interop"
-	"github.com/nspcc-dev/neo-go/pkg/crypto"
-	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
-	"github.com/nspcc-dev/neo-go/pkg/util"
-	"github.com/nspcc-dev/neo-go/pkg/vm"
-	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
-	"github.com/stretchr/testify/require"
-)
-
-type testVerifiable []byte
-
-var _ crypto.Verifiable = testVerifiable{}
-
-func (v testVerifiable) GetSignedPart() []byte {
-	return v
-}
-func (v testVerifiable) GetSignedHash() util.Uint256 {
-	return hash.Sha256(v)
-}
-
-func testHash0100(t *testing.T, result string, interopFunc func(*interop.Context) error) {
-	t.Run("good", func(t *testing.T) {
-		bs := []byte{1, 0}
-
-		checkGood := func(t *testing.T, ic *interop.Context) {
-			require.NoError(t, interopFunc(ic))
-			require.Equal(t, 1, ic.VM.Estack().Len())
-			require.Equal(t, result, hex.EncodeToString(ic.VM.Estack().Pop().Bytes()))
-		}
-		t.Run("raw bytes", func(t *testing.T) {
-			ic := &interop.Context{VM: vm.New()}
-			ic.VM.Estack().PushVal(bs)
-			checkGood(t, ic)
-		})
-		t.Run("interop", func(t *testing.T) {
-			ic := &interop.Context{VM: vm.New()}
-			ic.VM.Estack().PushVal(stackitem.NewInterop(testVerifiable(bs)))
-			checkGood(t, ic)
-		})
-		t.Run("container", func(t *testing.T) {
-			ic := &interop.Context{VM: vm.New(), Container: testVerifiable(bs)}
-			ic.VM.Estack().PushVal(stackitem.Null{})
-			checkGood(t, ic)
-		})
-	})
-	t.Run("bad message", func(t *testing.T) {
-		ic := &interop.Context{VM: vm.New()}
-		ic.VM.Estack().PushVal(stackitem.NewArray(nil))
-		require.Error(t, interopFunc(ic))
-	})
-}
-
-func TestSHA256(t *testing.T) {
-	// 0x0100 hashes to 47dc540c94ceb704a23875c11273e16bb0b8a87aed84de911f2133568115f254
-	res := "47dc540c94ceb704a23875c11273e16bb0b8a87aed84de911f2133568115f254"
-	testHash0100(t, res, Sha256)
-}
-
-func TestRIPEMD160(t *testing.T) {
-	// 0x0100 hashes to 213492c0c6fc5d61497cf17249dd31cd9964b8a3
-	res := "213492c0c6fc5d61497cf17249dd31cd9964b8a3"
-	testHash0100(t, res, RipeMD160)
-}

pkg/core/interop/crypto/interop.go

@@ -10,8 +10,6 @@ var (
 	ecdsaSecp256k1VerifyID        = interopnames.ToID([]byte(interopnames.NeoCryptoVerifyWithECDsaSecp256k1))
 	ecdsaSecp256r1CheckMultisigID = interopnames.ToID([]byte(interopnames.NeoCryptoCheckMultisigWithECDsaSecp256r1))
 	ecdsaSecp256k1CheckMultisigID = interopnames.ToID([]byte(interopnames.NeoCryptoCheckMultisigWithECDsaSecp256k1))
-	sha256ID                      = interopnames.ToID([]byte(interopnames.NeoCryptoSHA256))
-	ripemd160ID                   = interopnames.ToID([]byte(interopnames.NeoCryptoRIPEMD160))
 )
 
 var cryptoInterops = []interop.Function{
@@ -19,8 +17,6 @@ var cryptoInterops = []interop.Function{
 	{ID: ecdsaSecp256k1VerifyID, Func: ECDSASecp256k1Verify},
 	{ID: ecdsaSecp256r1CheckMultisigID, Func: ECDSASecp256r1CheckMultisig},
 	{ID: ecdsaSecp256k1CheckMultisigID, Func: ECDSASecp256k1CheckMultisig},
-	{ID: sha256ID, Func: Sha256},
-	{ID: ripemd160ID, Func: RipeMD160},
 }
 
 func init() {

pkg/core/interop/interopnames/names.go

@@ -51,8 +51,6 @@ const (
 	NeoCryptoVerifyWithECDsaSecp256k1        = "Neo.Crypto.VerifyWithECDsaSecp256k1"
 	NeoCryptoCheckMultisigWithECDsaSecp256r1 = "Neo.Crypto.CheckMultisigWithECDsaSecp256r1"
 	NeoCryptoCheckMultisigWithECDsaSecp256k1 = "Neo.Crypto.CheckMultisigWithECDsaSecp256k1"
-	NeoCryptoSHA256                          = "Neo.Crypto.SHA256"
-	NeoCryptoRIPEMD160                       = "Neo.Crypto.RIPEMD160"
 )
 
 var names = []string{
@@ -105,6 +103,4 @@ var names = []string{
 	NeoCryptoVerifyWithECDsaSecp256k1,
 	NeoCryptoCheckMultisigWithECDsaSecp256r1,
 	NeoCryptoCheckMultisigWithECDsaSecp256k1,
-	NeoCryptoSHA256,
-	NeoCryptoRIPEMD160,
 }

pkg/core/interops.go

@@ -93,8 +93,6 @@ var neoInterops = []interop.Function{
 		Price: fee.ECDSAVerifyPrice, ParamCount: 3},
 	{Name: interopnames.NeoCryptoCheckMultisigWithECDsaSecp256r1, Func: crypto.ECDSASecp256r1CheckMultisig, Price: 0, ParamCount: 3},
 	{Name: interopnames.NeoCryptoCheckMultisigWithECDsaSecp256k1, Func: crypto.ECDSASecp256k1CheckMultisig, Price: 0, ParamCount: 3},
-	{Name: interopnames.NeoCryptoSHA256, Func: crypto.Sha256, Price: 1 << 15, ParamCount: 1},
-	{Name: interopnames.NeoCryptoRIPEMD160, Func: crypto.RipeMD160, Price: 1 << 15, ParamCount: 1},
 }
 
 // initIDinInteropsSlice initializes IDs from names in one given

pkg/core/native/contract.go

@@ -24,6 +24,7 @@ type Contracts struct {
 	Designate   *Designate
 	NameService *NameService
 	Notary      *Notary
+	Crypto      *Crypto
 	Contracts   []interop.Contract
 	// persistScript is vm script which executes "onPersist" method of every native contract.
 	persistScript []byte
@@ -61,6 +62,10 @@ func NewContracts(p2pSigExtensionsEnabled bool) *Contracts {
 	cs.Management = mgmt
 	cs.Contracts = append(cs.Contracts, mgmt)
 
+	c := newCrypto()
+	cs.Crypto = c
+	cs.Contracts = append(cs.Contracts, c)
+
 	ledger := newLedger()
 	cs.Ledger = ledger
 	cs.Contracts = append(cs.Contracts, ledger)

pkg/core/native/crypto.go

@@ -0,0 +1,138 @@
+package native
+
+import (
+	"crypto/elliptic"
+	"errors"
+	"fmt"
+
+	"github.com/btcsuite/btcd/btcec"
+	"github.com/nspcc-dev/neo-go/pkg/core/interop"
+	"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
+	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
+)
+
+// Crypto represents CryptoLib contract.
+type Crypto struct {
+	interop.ContractMD
+}
+
+// NamedCurve identifies named elliptic curves.
+type NamedCurve byte
+
+// Various named elliptic curves.
+const (
+	Secp256k1 NamedCurve = 22
+	Secp256r1 NamedCurve = 23
+)
+
+const cryptoContractID = -3
+
+func newCrypto() *Crypto {
+	c := &Crypto{ContractMD: *interop.NewContractMD(nativenames.CryptoLib, cryptoContractID)}
+	defer c.UpdateHash()
+
+	desc := newDescriptor("sha256", smartcontract.ByteArrayType,
+		manifest.NewParameter("data", smartcontract.ByteArrayType))
+	md := newMethodAndPrice(c.sha256, 1<<15, callflag.NoneFlag)
+	c.AddMethod(md, desc)
+
+	desc = newDescriptor("ripemd160", smartcontract.ByteArrayType,
+		manifest.NewParameter("data", smartcontract.ByteArrayType))
+	md = newMethodAndPrice(c.ripemd160, 1<<15, callflag.NoneFlag)
+	c.AddMethod(md, desc)
+
+	desc = newDescriptor("verifyWithECDsa", smartcontract.BoolType,
+		manifest.NewParameter("message", smartcontract.ByteArrayType),
+		manifest.NewParameter("pubkey", smartcontract.ByteArrayType),
+		manifest.NewParameter("signature", smartcontract.ByteArrayType),
+		manifest.NewParameter("curve", smartcontract.IntegerType))
+	md = newMethodAndPrice(c.verifyWithECDsa, 1<<15, callflag.NoneFlag)
+	c.AddMethod(md, desc)
+	return c
+}
+
+func (c *Crypto) sha256(_ *interop.Context, args []stackitem.Item) stackitem.Item {
+	bs, err := args[0].TryBytes()
+	if err != nil {
+		panic(err)
+	}
+	return stackitem.NewByteArray(hash.Sha256(bs).BytesBE())
+}
+
+func (c *Crypto) ripemd160(_ *interop.Context, args []stackitem.Item) stackitem.Item {
+	bs, err := args[0].TryBytes()
+	if err != nil {
+		panic(err)
+	}
+	return stackitem.NewByteArray(hash.RipeMD160(bs).BytesBE())
+}
+
+func (c *Crypto) verifyWithECDsa(_ *interop.Context, args []stackitem.Item) stackitem.Item {
+	msg, err := args[0].TryBytes()
+	if err != nil {
+		panic(fmt.Errorf("invalid message stackitem: %w", err))
+	}
+	hashToCheck := hash.Sha256(msg)
+	pubkey, err := args[1].TryBytes()
+	if err != nil {
+		panic(fmt.Errorf("invalid pubkey stackitem: %w", err))
+	}
+	signature, err := args[2].TryBytes()
+	if err != nil {
+		panic(fmt.Errorf("invalid signature stackitem: %w", err))
+	}
+	curve, err := curveFromStackitem(args[3])
+	if err != nil {
+		panic(fmt.Errorf("invalid curve stackitem: %w", err))
+	}
+	pkey, err := keys.NewPublicKeyFromBytes(pubkey, curve)
+	if err != nil {
+		panic(fmt.Errorf("failed to decode pubkey: %w", err))
+	}
+	res := pkey.Verify(signature, hashToCheck.BytesBE())
+	return stackitem.NewBool(res)
+}
+
+func curveFromStackitem(si stackitem.Item) (elliptic.Curve, error) {
+	curve, err := si.TryInteger()
+	if err != nil {
+		return nil, err
+	}
+	if !curve.IsInt64() {
+		return nil, errors.New("not an int64")
+	}
+	c := curve.Int64()
+	switch c {
+	case int64(Secp256k1):
+		return btcec.S256(), nil
+	case int64(Secp256r1):
+		return elliptic.P256(), nil
+	default:
+		return nil, errors.New("unsupported curve type")
+	}
+}
+
+// Metadata implements Contract interface.
+func (c *Crypto) Metadata() *interop.ContractMD {
+	return &c.ContractMD
+}
+
+// Initialize implements Contract interface.
+func (c *Crypto) Initialize(ic *interop.Context) error {
+	return nil
+}
+
+// OnPersist implements Contract interface.
+func (c *Crypto) OnPersist(ic *interop.Context) error {
+	return nil
+}
+
+// PostPersist implements Contract interface.
+func (c *Crypto) PostPersist(ic *interop.Context) error {
+	return nil
+}

pkg/core/native/crypto_test.go

@@ -0,0 +1,41 @@
+package native
+
+import (
+	"encoding/hex"
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/pkg/core/interop"
+	"github.com/nspcc-dev/neo-go/pkg/vm"
+	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSha256(t *testing.T) {
+	c := newCrypto()
+	ic := &interop.Context{VM: vm.New()}
+
+	t.Run("bad arg type", func(t *testing.T) {
+		require.Panics(t, func() {
+			c.sha256(ic, []stackitem.Item{stackitem.NewInterop(nil)})
+		})
+	})
+	t.Run("good", func(t *testing.T) {
+		// 0x0100 hashes to 47dc540c94ceb704a23875c11273e16bb0b8a87aed84de911f2133568115f254
+		require.Equal(t, "47dc540c94ceb704a23875c11273e16bb0b8a87aed84de911f2133568115f254", hex.EncodeToString(c.sha256(ic, []stackitem.Item{stackitem.NewByteArray([]byte{1, 0})}).Value().([]byte)))
+	})
+}
+
+func TestRIPEMD160(t *testing.T) {
+	c := newCrypto()
+	ic := &interop.Context{VM: vm.New()}
+
+	t.Run("bad arg type", func(t *testing.T) {
+		require.Panics(t, func() {
+			c.ripemd160(ic, []stackitem.Item{stackitem.NewInterop(nil)})
+		})
+	})
+	t.Run("good", func(t *testing.T) {
+		// 0x0100 hashes to 213492c0c6fc5d61497cf17249dd31cd9964b8a3
+		require.Equal(t, "213492c0c6fc5d61497cf17249dd31cd9964b8a3", hex.EncodeToString(c.ripemd160(ic, []stackitem.Item{stackitem.NewByteArray([]byte{1, 0})}).Value().([]byte)))
+	})
+}

pkg/core/native/designate.go

@@ -52,7 +52,7 @@ type roleData struct {
 }
 
 const (
-	designateContractID = -6
+	designateContractID = -8
 
 	// maxNodeCount is the maximum number of nodes to set the role for.
 	maxNodeCount = 32

pkg/core/native/ledger.go

@@ -26,7 +26,7 @@ type Ledger struct {
 }
 
 const (
-	ledgerContractID = -2
+	ledgerContractID = -4
 
 	prefixBlockHash    = 9
 	prefixCurrentBlock = 12

pkg/core/native/name_service.go

@@ -54,7 +54,7 @@ const (
 )
 
 const (
-	nameServiceID = -8
+	nameServiceID = -10
 
 	prefixRoots       = 10
 	prefixDomainPrice = 22

pkg/core/native/native_gas.go

@@ -18,7 +18,7 @@ type GAS struct {
 	NEO *NEO
 }
 
-const gasContractID = -4
+const gasContractID = -6
 
 // GASFactor is a divisor for finding GAS integral value.
 const GASFactor = NEOTotalSupply

pkg/core/native/native_neo.go

@@ -50,7 +50,7 @@ type NEO struct {
 }
 
 const (
-	neoContractID = -3
+	neoContractID = -5
 	// NEOTotalSupply is the total amount of NEO in the system.
 	NEOTotalSupply = 100000000
 	// prefixCandidate is a prefix used to store validator's data.

pkg/core/native/nativenames/names.go

@@ -11,4 +11,5 @@ const (
 	Designation = "RoleManagement"
 	Notary      = "Notary"
 	NameService = "NameService"
+	CryptoLib   = "CryptoLib"
 )

pkg/core/native/oracle.go

@@ -47,7 +47,7 @@ type Oracle struct {
 }
 
 const (
-	oracleContractID  = -7
+	oracleContractID  = -9
 	maxURLLength      = 256
 	maxFilterLength   = 128
 	maxCallbackLength = 32

pkg/core/native/policy.go

@@ -19,7 +19,7 @@ import (
 )
 
 const (
-	policyContractID = -5
+	policyContractID = -7
 
 	defaultExecFeeFactor      = interop.DefaultBaseExecFee
 	defaultFeePerByte         = 1000

pkg/interop/crypto/crypto.go

@@ -8,16 +8,6 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/interop/neogointernal"
 )
 
-// SHA256 computes SHA256 hash of b. It uses `Neo.Crypto.SHA256` syscall.
-func SHA256(b []byte) interop.Hash256 {
-	return neogointernal.Syscall1("Neo.Crypto.SHA256", b).(interop.Hash256)
-}
-
-// RIPEMD160 computes RIPEMD160 hash of b. It uses `Neo.Crypto.RIPEMD160` syscall.
-func RIPEMD160(b []byte) interop.Hash160 {
-	return neogointernal.Syscall1("Neo.Crypto.RIPEMD160", b).(interop.Hash160)
-}
-
 // ECDsaSecp256r1Verify checks that sig is correct msg's signature for a given pub
 // (serialized public key). It uses `Neo.Crypto.VerifyWithECDsaSecp256r1` syscall.
 func ECDsaSecp256r1Verify(msg []byte, pub interop.PublicKey, sig interop.Signature) bool {

pkg/interop/native/crypto/crypto.go

@@ -0,0 +1,34 @@
+package crypto
+
+import (
+	"github.com/nspcc-dev/neo-go/pkg/interop"
+	"github.com/nspcc-dev/neo-go/pkg/interop/contract"
+)
+
+// Hash represents CryptoLib contract hash.
+const Hash = "\x1b\xf5\x75\xab\x11\x89\x68\x84\x13\x61\x0a\x35\xa1\x28\x86\xcd\xe0\xb6\x6c\x72"
+
+// NamedCurve represents named elliptic curve.
+type NamedCurve byte
+
+// Various named elliptic curves.
+const (
+	Secp256k1 NamedCurve = 22
+	Secp256r1 NamedCurve = 23
+)
+
+// Sha256 calls `sha256` method of native CryptoLib contract and computes SHA256 hash of b.
+func Sha256(b []byte) interop.Hash256 {
+	return contract.Call(interop.Hash160(Hash), "sha256", contract.NoneFlag, b).(interop.Hash256)
+}
+
+// Ripemd160 calls `ripemd160` method of native CryptoLib contract and computes RIPEMD160 hash of b.
+func Ripemd160(b []byte) interop.Hash160 {
+	return contract.Call(interop.Hash160(Hash), "ripemd160", contract.NoneFlag, b).(interop.Hash160)
+}
+
+// VerifyWithECDsa calls `verifyWithECDsa` method of native CryptoLib contract and checks that sig is
+// correct msg's signature for a given pub (serialized public key on a given curve).
+func VerifyWithECDsa(msg []byte, pub interop.PublicKey, sig interop.Signature, curve NamedCurve) bool {
+	return contract.Call(interop.Hash160(Hash), "verifyWithECDsa", contract.NoneFlag, msg, pub, sig, curve).(bool)
+}

pkg/rpc/server/server_test.go

@@ -183,7 +183,7 @@ var rpcTestCases = map[string][]rpcTestCase{
 			check: func(t *testing.T, e *executor, cs interface{}) {
 				res, ok := cs.(*state.Contract)
 				require.True(t, ok)
-				assert.Equal(t, int32(-5), res.ID)
+				assert.Equal(t, int32(-7), res.ID)
 			},
 		},
 		{