[#93] Remove golang.org/x/crypto dependency

Signed-off-by: Denis Kirillov <denis@nspcc.ru>

eacl/record_test.go

@@ -2,11 +2,10 @@ package eacl
 
 import (
 	"crypto/ecdsa"
-	"crypto/elliptic"
-	"crypto/rand"
 	"fmt"
 	"testing"
 
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	v2acl "github.com/nspcc-dev/neofs-api-go/v2/acl"
 	checksumtest "github.com/nspcc-dev/neofs-sdk-go/checksum/test"
 	cidtest "github.com/nspcc-dev/neofs-sdk-go/container/id/test"
@@ -252,7 +251,7 @@ func TestReservedRecords(t *testing.T) {
 }
 
 func randomPublicKey(t *testing.T) *ecdsa.PublicKey {
-	p, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	p, err := keys.NewPrivateKey()
 	require.NoError(t, err)
-	return &p.PublicKey
+	return &p.PrivateKey.PublicKey
 }

eacl/target.go

@@ -2,8 +2,8 @@ package eacl
 
 import (
 	"crypto/ecdsa"
-	"crypto/elliptic"
 
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	v2acl "github.com/nspcc-dev/neofs-api-go/v2/acl"
 )
 
@@ -51,8 +51,7 @@ func SetTargetECDSAKeys(t *Target, pubs ...*ecdsa.PublicKey) {
 	}
 
 	for i := 0; i < ln; i++ {
-		b := elliptic.MarshalCompressed(pubs[i].Curve, pubs[i].X, pubs[i].Y)
+		binKeys = append(binKeys, (*keys.PublicKey)(pubs[i]).Bytes())
-		binKeys = append(binKeys, b)
 	}
 
 	t.SetBinaryKeys(binKeys)
@@ -68,13 +67,9 @@ func TargetECDSAKeys(t *Target) []*ecdsa.PublicKey {
 	pubs := make([]*ecdsa.PublicKey, ln)
 
 	for i := 0; i < ln; i++ {
-		x, y := elliptic.UnmarshalCompressed(elliptic.P256(), binKeys[i])
+		p := new(keys.PublicKey)
-		if x != nil && y != nil {
+		if p.DecodeBytes(binKeys[i]) == nil {
-			pubs[i] = &ecdsa.PublicKey{
+			pubs[i] = (*ecdsa.PublicKey)(p)
-				Curve: elliptic.P256(),
-				X:     x,
-				Y:     y,
-			}
 		}
 	}
 

eacl/target_test.go

@@ -2,9 +2,9 @@ package eacl
 
 import (
 	"crypto/ecdsa"
-	"crypto/elliptic"
 	"testing"
 
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neofs-api-go/v2/acl"
 	v2acl "github.com/nspcc-dev/neofs-api-go/v2/acl"
 	"github.com/stretchr/testify/require"
@@ -25,8 +25,7 @@ func TestTarget(t *testing.T) {
 	require.Equal(t, v2acl.RoleSystem, v2.GetRole())
 	require.Len(t, v2.GetKeys(), len(pubs))
 	for i, key := range v2.GetKeys() {
-		b := elliptic.MarshalCompressed(pubs[i].Curve, pubs[i].X, pubs[i].Y)
+		require.Equal(t, key, (*keys.PublicKey)(pubs[i]).Bytes())
-		require.Equal(t, key, b)
 	}
 
 	newTarget := NewTargetFromV2(v2)

go.mod

@@ -12,9 +12,7 @@ require (
 	github.com/nspcc-dev/neo-go v0.98.0
 	github.com/nspcc-dev/neofs-api-go/v2 v2.11.0-pre.0.20211201134523-3604d96f3fe1
 	github.com/nspcc-dev/neofs-crypto v0.3.0
-	github.com/nspcc-dev/rfc6979 v0.2.0
 	github.com/stretchr/testify v1.7.0
 	go.uber.org/zap v1.18.1
-	golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97
 	google.golang.org/grpc v1.41.0
 )

object/fmt_test.go

@@ -1,11 +1,10 @@
 package object
 
 import (
-	"crypto/ecdsa"
-	"crypto/elliptic"
 	"crypto/rand"
 	"testing"
 
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/stretchr/testify/require"
 )
 
@@ -18,9 +17,9 @@ func TestVerificationFields(t *testing.T) {
 	obj.SetPayload(payload)
 	obj.SetPayloadSize(uint64(len(payload)))
 
-	p, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	p, err := keys.NewPrivateKey()
 	require.NoError(t, err)
-	require.NoError(t, SetVerificationFields(p, obj))
+	require.NoError(t, SetVerificationFields(&p.PrivateKey, obj))
 
 	require.NoError(t, CheckVerificationFields(obj.Object()))
 

owner/id.go

@@ -6,6 +6,8 @@ import (
 	"fmt"
 
 	"github.com/mr-tron/base58"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
+	"github.com/nspcc-dev/neo-go/pkg/encoding/address"
 	"github.com/nspcc-dev/neofs-api-go/v2/refs"
 )
 
@@ -94,12 +96,12 @@ func valid(rawID []byte) bool {
 	if len(rawID) != NEO3WalletSize {
 		return false
 	}
-	if rawID[0] != addressPrefixN3 {
+	if rawID[0] != address.NEO3Prefix {
 		return false
 	}
 
 	const boundIndex = NEO3WalletSize - 4
-	return bytes.Equal(rawID[boundIndex:], addressChecksum(rawID[:boundIndex]))
+	return bytes.Equal(rawID[boundIndex:], hash.Checksum(rawID[:boundIndex]))
 }
 
 // Marshal marshals ID into a protobuf binary form.

owner/id_test.go

@@ -2,11 +2,11 @@ package owner_test
 
 import (
 	"crypto/ecdsa"
-	"crypto/elliptic"
-	"crypto/rand"
 	"testing"
 
 	"github.com/mr-tron/base58"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/util/slice"
 	"github.com/nspcc-dev/neofs-api-go/v2/refs"
 	. "github.com/nspcc-dev/neofs-sdk-go/owner"
 	ownertest "github.com/nspcc-dev/neofs-sdk-go/owner/test"
@@ -28,11 +28,10 @@ func TestID_Valid(t *testing.T) {
 	val := id.ToV2().GetValue()
 
 	t.Run("invalid prefix", func(t *testing.T) {
-		v := make([]byte, len(val))
+		val := slice.Copy(val)
-		copy(v, val)
+		val[0] ^= 0xFF
-		v[0] ^= 0xFF
 
-		id := ownertest.IDFromBytes(v)
+		id := ownertest.IDFromBytes(val)
 		require.False(t, id.Valid())
 	})
 	t.Run("invalid size", func(t *testing.T) {
@@ -42,20 +41,19 @@ func TestID_Valid(t *testing.T) {
 		require.False(t, id.Valid())
 	})
 	t.Run("invalid checksum", func(t *testing.T) {
-		v := make([]byte, len(val))
+		val := slice.Copy(val)
-		copy(v, val)
+		val[NEO3WalletSize-1] ^= 0xFF
-		v[NEO3WalletSize-1] ^= 0xFF
 
-		id := ownertest.IDFromBytes(v)
+		id := ownertest.IDFromBytes(val)
 		require.False(t, id.Valid())
 	})
 }
 
 func TestNewIDFromNeo3Wallet(t *testing.T) {
-	p, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	p, err := keys.NewPrivateKey()
 	require.NoError(t, err)
 
-	wallet, err := NEO3WalletFromPublicKey(&p.PublicKey)
+	wallet, err := NEO3WalletFromPublicKey((*ecdsa.PublicKey)(p.PublicKey()))
 	require.NoError(t, err)
 
 	id := NewIDFromNeo3Wallet(wallet)
@@ -64,10 +62,10 @@ func TestNewIDFromNeo3Wallet(t *testing.T) {
 
 func TestID_Parse(t *testing.T) {
 	t.Run("should parse successful", func(t *testing.T) {
-		p, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+		p, err := keys.NewPrivateKey()
 		require.NoError(t, err)
 
-		wallet, err := NEO3WalletFromPublicKey(&p.PublicKey)
+		wallet, err := NEO3WalletFromPublicKey((*ecdsa.PublicKey)(p.PublicKey()))
 		require.NoError(t, err)
 
 		eid := NewIDFromNeo3Wallet(wallet)

owner/test/id.go

@@ -1,9 +1,11 @@
 package ownertest
 
 import (
-	"crypto/sha256"
 	"math/rand"
 
+	"github.com/mr-tron/base58"
+	"github.com/nspcc-dev/neo-go/pkg/encoding/address"
+	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/nspcc-dev/neofs-api-go/v2/refs"
 	"github.com/nspcc-dev/neofs-sdk-go/owner"
 )
@@ -11,13 +13,15 @@ import (
 // ID returns owner.ID calculated
 // from a random owner.NEO3Wallet.
 func ID() *owner.ID {
-	u := make([]byte, owner.NEO3WalletSize)
+	u := util.Uint160{}
-	u[0] = 0x35
+	rand.Read(u[:])
-	rand.Read(u[1:21])
+
-	h1 := sha256.Sum256(u[:21])
+	addr := address.Uint160ToString(u)
-	h2 := sha256.Sum256(h1[:])
+	data, err := base58.Decode(addr)
-	copy(u[21:], h2[:4])
+	if err != nil {
-	return IDFromBytes(u)
+		panic(err)
+	}
+	return IDFromBytes(data)
 }
 
 // IDFromBytes returns owner.ID generated

owner/wallet.go

@@ -2,12 +2,11 @@ package owner
 
 import (
 	"crypto/ecdsa"
-	"crypto/elliptic"
-	"crypto/sha256"
 	"errors"
+	"fmt"
 
 	"github.com/mr-tron/base58"
-	"golang.org/x/crypto/ripemd160"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 )
 
 // NEO3Wallet represents NEO3 wallet address.
@@ -16,8 +15,6 @@ type NEO3Wallet [NEO3WalletSize]byte
 // NEO3WalletSize contains size of neo3 wallet.
 const NEO3WalletSize = 25
 
-const addressPrefixN3 = 0x35
-
 // ErrEmptyPublicKey when PK passed to Verify method is nil.
 var ErrEmptyPublicKey = errors.New("empty public key")
 
@@ -27,30 +24,17 @@ func NEO3WalletFromPublicKey(key *ecdsa.PublicKey) (*NEO3Wallet, error) {
 		return nil, ErrEmptyPublicKey
 	}
 
-	b := elliptic.MarshalCompressed(key.Curve, key.X, key.Y)
+	neoPublicKey := (*keys.PublicKey)(key)
-	script := []byte{0x0C /* PUSHDATA1 */, byte(len(b)) /* 33 */}
-	script = append(script, b...)
-	script = append(script, 0x41 /* SYSCALL */)
-	h := sha256.Sum256([]byte("System.Crypto.CheckSig"))
-	script = append(script, h[:4]...)
 
-	h1 := sha256.Sum256(script)
+	d, err := base58.Decode(neoPublicKey.Address())
-	rw := ripemd160.New()
+	if err != nil {
-	rw.Write(h1[:])
+		return nil, fmt.Errorf("can't decode neo3 address from key: %w", err)
-	h160 := rw.Sum(nil)
+	}
 
-	var w NEO3Wallet
+	w := new(NEO3Wallet)
-	w[0] = addressPrefixN3
+	copy(w.Bytes(), d)
-	copy(w[1:21], h160)
-	copy(w[21:], addressChecksum(w[:21]))
 
-	return &w, nil
+	return w, nil
-}
-
-func addressChecksum(data []byte) []byte {
-	h1 := sha256.Sum256(data)
-	h2 := sha256.Sum256(h1[:])
-	return h2[:4]
 }
 
 // String implements fmt.Stringer.

pool/pool.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"crypto/ecdsa"
 	"crypto/sha256"
-	"encoding/hex"
 	"errors"
 	"fmt"
 	"math"
@@ -14,6 +13,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neofs-sdk-go/client"
 	apistatus "github.com/nspcc-dev/neofs-sdk-go/client/status"
 	"github.com/nspcc-dev/neofs-sdk-go/container"
@@ -430,9 +430,8 @@ func (p *pool) OwnerID() *owner.ID {
 }
 
 func formCacheKey(address string, key *ecdsa.PrivateKey) string {
-	buf := make([]byte, 32)
+	k := keys.PrivateKey{PrivateKey: *key}
-	key.D.FillBytes(buf)
+	return address + k.String()
-	return address + hex.EncodeToString(buf)
 }
 
 func (p *pool) conn(ctx context.Context, cfg *callConfig) (*clientPack, []client.CallOption, error) {

pool/pool_test.go

@@ -5,8 +5,6 @@ package pool
 import (
 	"context"
 	"crypto/ecdsa"
-	"crypto/elliptic"
-	crand "crypto/rand"
 	"fmt"
 	"math/rand"
 	"testing"
@@ -14,6 +12,7 @@ import (
 
 	"github.com/golang/mock/gomock"
 	"github.com/google/uuid"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neofs-sdk-go/client"
 	"github.com/nspcc-dev/neofs-sdk-go/netmap"
 	"github.com/nspcc-dev/neofs-sdk-go/session"
@@ -64,9 +63,9 @@ func TestBuildPoolCreateSessionFailed(t *testing.T) {
 }
 
 func newPrivateKey(t *testing.T) *ecdsa.PrivateKey {
-	p, err := ecdsa.GenerateKey(elliptic.P256(), crand.Reader)
+	p, err := keys.NewPrivateKey()
 	require.NoError(t, err)
-	return p
+	return &p.PrivateKey
 }
 
 func TestBuildPoolOneNodeFailed(t *testing.T) {

reputation/test/generate.go

@@ -1,11 +1,9 @@
 package reputationtest
 
 import (
-	"crypto/ecdsa"
-	"crypto/elliptic"
-	"crypto/rand"
 	"testing"
 
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neofs-sdk-go/reputation"
 	"github.com/nspcc-dev/neofs-sdk-go/util/signature"
 	"github.com/stretchr/testify/require"
@@ -14,13 +12,13 @@ import (
 func PeerID() *reputation.PeerID {
 	v := reputation.NewPeerID()
 
-	p, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	p, err := keys.NewPrivateKey()
 	if err != nil {
 		panic(err)
 	}
 
 	key := [signature.PublicKeyCompressedSize]byte{}
-	copy(key[:], elliptic.MarshalCompressed(p.Curve, p.X, p.Y))
+	copy(key[:], p.Bytes())
 	v.SetPublicKey(key)
 
 	return v
@@ -53,9 +51,9 @@ func GlobalTrust() *reputation.GlobalTrust {
 func SignedGlobalTrust(t testing.TB) *reputation.GlobalTrust {
 	gt := GlobalTrust()
 
-	p, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	p, err := keys.NewPrivateKey()
 	require.NoError(t, err)
-	require.NoError(t, gt.Sign(p))
+	require.NoError(t, gt.Sign(&p.PrivateKey))
 
 	return gt
 }

session/test/token.go

@@ -1,22 +1,20 @@
 package sessiontest
 
 import (
-	"crypto/ecdsa"
-	"crypto/elliptic"
-	crand "crypto/rand"
 	"math/rand"
 
 	"github.com/google/uuid"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neofs-sdk-go/owner"
 	"github.com/nspcc-dev/neofs-sdk-go/session"
 )
 
-var p *ecdsa.PrivateKey
+var p *keys.PrivateKey
 
 func init() {
 	var err error
 
-	p, err = ecdsa.GenerateKey(elliptic.P256(), crand.Reader)
+	p, err = keys.NewPrivateKey()
 	if err != nil {
 		panic(err)
 	}
@@ -39,7 +37,7 @@ func Token() *session.Token {
 	ownerID := owner.NewID()
 	ownerID.SetNeo3Wallet(w)
 
-	keyBin := elliptic.MarshalCompressed(p.PublicKey.Curve, p.PublicKey.X, p.PublicKey.Y)
+	keyBin := p.PublicKey().Bytes()
 
 	tok.SetID(uid)
 	tok.SetOwnerID(ownerID)
@@ -57,7 +55,7 @@ func Token() *session.Token {
 func SignedToken() *session.Token {
 	tok := Token()
 
-	err := tok.Sign(p)
+	err := tok.Sign(&p.PrivateKey)
 	if err != nil {
 		panic(err)
 	}

token/bearer.go

@@ -5,6 +5,7 @@ import (
 	"crypto/elliptic"
 	"errors"
 
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neofs-api-go/v2/acl"
 	"github.com/nspcc-dev/neofs-api-go/v2/refs"
 	v2signature "github.com/nspcc-dev/neofs-api-go/v2/signature"
@@ -89,14 +90,8 @@ func (b *BearerToken) SignToken(key *ecdsa.PrivateKey) error {
 // To pass node validation it should be owner of requested container. Returns
 // nil if token is not signed.
 func (b *BearerToken) Issuer() *owner.ID {
-	var pub *ecdsa.PublicKey
+	pub, _ := keys.NewPublicKeyFromBytes(b.token.GetSignature().GetKey(), elliptic.P256())
-
+	wallet, err := owner.NEO3WalletFromPublicKey((*ecdsa.PublicKey)(pub))
-	x, y := elliptic.UnmarshalCompressed(elliptic.P256(), b.token.GetSignature().GetKey())
-	if x != nil && y != nil {
-		pub = &ecdsa.PublicKey{Curve: elliptic.P256(), X: x, Y: y}
-	}
-
-	wallet, err := owner.NEO3WalletFromPublicKey(pub)
 	if err != nil {
 		return nil
 	}

token/bearer_test.go

@@ -2,10 +2,9 @@ package token_test
 
 import (
 	"crypto/ecdsa"
-	"crypto/elliptic"
-	"crypto/rand"
 	"testing"
 
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neofs-sdk-go/eacl"
 	"github.com/nspcc-dev/neofs-sdk-go/owner"
 	"github.com/nspcc-dev/neofs-sdk-go/token"
@@ -21,16 +20,16 @@ func TestBearerToken_Issuer(t *testing.T) {
 	})
 
 	t.Run("signed token", func(t *testing.T) {
-		p, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+		p, err := keys.NewPrivateKey()
 		require.NoError(t, err)
 
-		wallet, err := owner.NEO3WalletFromPublicKey(&p.PublicKey)
+		wallet, err := owner.NEO3WalletFromPublicKey((*ecdsa.PublicKey)(p.PublicKey()))
 		require.NoError(t, err)
 
 		ownerID := owner.NewIDFromNeo3Wallet(wallet)
 
 		bearerToken.SetEACLTable(eacl.NewTable())
-		require.NoError(t, bearerToken.SignToken(p))
+		require.NoError(t, bearerToken.SignToken(&p.PrivateKey))
 		require.True(t, ownerID.Equal(bearerToken.Issuer()))
 	})
 }

token/test/generate.go

@@ -1,10 +1,7 @@
 package tokentest
 
 import (
-	"crypto/ecdsa"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
-	"crypto/elliptic"
-	"crypto/rand"
-
 	eacltest "github.com/nspcc-dev/neofs-sdk-go/eacl/test"
 	ownertest "github.com/nspcc-dev/neofs-sdk-go/owner/test"
 	"github.com/nspcc-dev/neofs-sdk-go/token"
@@ -29,12 +26,12 @@ func BearerToken() *token.BearerToken {
 func SignedBearerToken() *token.BearerToken {
 	tok := BearerToken()
 
-	p, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	p, err := keys.NewPrivateKey()
 	if err != nil {
 		panic(err)
 	}
 
-	err = tok.SignToken(p)
+	err = tok.SignToken(&p.PrivateKey)
 	if err != nil {
 		panic(err)
 	}

util/signature/data.go

@@ -4,6 +4,9 @@ import (
 	"crypto/ecdsa"
 	"crypto/elliptic"
 	"errors"
+	"fmt"
+
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 )
 
 type DataSource interface {
@@ -72,8 +75,8 @@ func SignDataWithHandler(key *ecdsa.PrivateKey, src DataSource, handler KeySigna
 		return err
 	}
 
-	b := elliptic.MarshalCompressed(key.Curve, key.X, key.Y)
+	pub := (*keys.PublicKey)(&key.PublicKey)
-	handler(b, sig)
+	handler(pub.Bytes(), sig)
 
 	return nil
 }
@@ -93,16 +96,19 @@ func VerifyDataWithSource(dataSrc DataSource, sigSrc KeySignatureSource, opts ..
 
 	key, sig := sigSrc()
 
-	var pub *ecdsa.PublicKey
+	var pub *keys.PublicKey
 	if len(key) != 0 {
-		x, y := elliptic.UnmarshalCompressed(elliptic.P256(), key)
+		pub, err = keys.NewPublicKeyFromBytes(key, elliptic.P256())
-		if x == nil || y == nil {
+		if err != nil {
-			return ErrInvalidPublicKey
+			return fmt.Errorf("%w: %v", ErrInvalidPublicKey, err)
 		}
-		pub = &ecdsa.PublicKey{Curve: elliptic.P256(), X: x, Y: y}
 	}
 
-	return cfg.verifyFunc(pub, data, sig)
+	return cfg.verifyFunc(
+		(*ecdsa.PublicKey)(pub),
+		data,
+		sig,
+	)
 }
 
 func SignData(key *ecdsa.PrivateKey, v DataWithSignature, opts ...SignOption) error {

util/signature/options.go

@@ -8,7 +8,7 @@ import (
 	"crypto/sha512"
 	"math/big"
 
-	"github.com/nspcc-dev/rfc6979"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 )
 
 var curve = elliptic.P256()
@@ -77,31 +77,15 @@ func SignWithRFC6979() SignOption {
 }
 
 func signRFC6979(key *ecdsa.PrivateKey, msg []byte) ([]byte, error) {
-	digest := sha256.Sum256(msg)
+	p := &keys.PrivateKey{PrivateKey: *key}
-	r, s := rfc6979.SignECDSA(key, digest[:], sha256.New)
+	return p.Sign(msg), nil
-	return getSignatureSlice(key.Curve, r, s), nil
 }
 
-func verifyRFC6979(pub *ecdsa.PublicKey, msg []byte, sig []byte) error {
+func verifyRFC6979(key *ecdsa.PublicKey, msg []byte, sig []byte) error {
+	p := (*keys.PublicKey)(key)
 	h := sha256.Sum256(msg)
-	if pub.X == nil || pub.Y == nil || len(sig) != 64 {
+	if p.Verify(sig, h[:]) {
-		return ErrInvalidSignature
-	}
-
-	rBytes := new(big.Int).SetBytes(sig[0:32])
-	sBytes := new(big.Int).SetBytes(sig[32:64])
-	if ecdsa.Verify(pub, h[:], rBytes, sBytes) {
 		return nil
 	}
 	return ErrInvalidSignature
 }
-
-func getSignatureSlice(curve elliptic.Curve, r, s *big.Int) []byte {
-	params := curve.Params()
-	curveOrderByteSize := params.P.BitLen() / 8
-	signature := make([]byte, curveOrderByteSize*2)
-	_ = r.FillBytes(signature[:curveOrderByteSize])
-	_ = s.FillBytes(signature[curveOrderByteSize:])
-
-	return signature
-}