aboutsummaryrefslogtreecommitdiffstats
path: root/crypto
diff options
context:
space:
mode:
Diffstat (limited to 'crypto')
-rw-r--r--crypto/crypto.go26
-rw-r--r--crypto/crypto_test.go8
-rw-r--r--crypto/ecies/asn1.go7
-rw-r--r--crypto/ecies/ecies.go1
-rw-r--r--crypto/ecies/ecies_test.go121
-rw-r--r--crypto/ecies/params.go14
-rw-r--r--crypto/key.go5
-rw-r--r--crypto/secp256k1/curve.go (renamed from crypto/curve.go)168
-rw-r--r--crypto/secp256k1/curve_test.go39
-rw-r--r--crypto/secp256k1/pubkey_scalar_mul.h56
-rw-r--r--crypto/secp256k1/secp256.go28
-rw-r--r--crypto/secp256k1/secp256_test.go2
12 files changed, 311 insertions, 164 deletions
diff --git a/crypto/crypto.go b/crypto/crypto.go
index 8685d62d3..7d7623753 100644
--- a/crypto/crypto.go
+++ b/crypto/crypto.go
@@ -43,14 +43,6 @@ import (
"golang.org/x/crypto/ripemd160"
)
-var secp256k1n *big.Int
-
-func init() {
- // specify the params for the s256 curve
- ecies.AddParamsForCurve(S256(), ecies.ECIES_AES128_SHA256)
- secp256k1n = common.String2Big("0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141")
-}
-
func Sha3(data ...[]byte) []byte {
d := sha3.NewKeccak256()
for _, b := range data {
@@ -99,9 +91,9 @@ func ToECDSA(prv []byte) *ecdsa.PrivateKey {
}
priv := new(ecdsa.PrivateKey)
- priv.PublicKey.Curve = S256()
+ priv.PublicKey.Curve = secp256k1.S256()
priv.D = common.BigD(prv)
- priv.PublicKey.X, priv.PublicKey.Y = S256().ScalarBaseMult(prv)
+ priv.PublicKey.X, priv.PublicKey.Y = secp256k1.S256().ScalarBaseMult(prv)
return priv
}
@@ -116,15 +108,15 @@ func ToECDSAPub(pub []byte) *ecdsa.PublicKey {
if len(pub) == 0 {
return nil
}
- x, y := elliptic.Unmarshal(S256(), pub)
- return &ecdsa.PublicKey{S256(), x, y}
+ x, y := elliptic.Unmarshal(secp256k1.S256(), pub)
+ return &ecdsa.PublicKey{secp256k1.S256(), x, y}
}
func FromECDSAPub(pub *ecdsa.PublicKey) []byte {
if pub == nil || pub.X == nil || pub.Y == nil {
return nil
}
- return elliptic.Marshal(S256(), pub.X, pub.Y)
+ return elliptic.Marshal(secp256k1.S256(), pub.X, pub.Y)
}
// HexToECDSA parses a secp256k1 private key.
@@ -168,7 +160,7 @@ func SaveECDSA(file string, key *ecdsa.PrivateKey) error {
}
func GenerateKey() (*ecdsa.PrivateKey, error) {
- return ecdsa.GenerateKey(S256(), rand.Reader)
+ return ecdsa.GenerateKey(secp256k1.S256(), rand.Reader)
}
func ValidateSignatureValues(v byte, r, s *big.Int) bool {
@@ -176,7 +168,7 @@ func ValidateSignatureValues(v byte, r, s *big.Int) bool {
return false
}
vint := uint32(v)
- if r.Cmp(secp256k1n) < 0 && s.Cmp(secp256k1n) < 0 && (vint == 27 || vint == 28) {
+ if r.Cmp(secp256k1.N) < 0 && s.Cmp(secp256k1.N) < 0 && (vint == 27 || vint == 28) {
return true
} else {
return false
@@ -189,8 +181,8 @@ func SigToPub(hash, sig []byte) (*ecdsa.PublicKey, error) {
return nil, err
}
- x, y := elliptic.Unmarshal(S256(), s)
- return &ecdsa.PublicKey{S256(), x, y}, nil
+ x, y := elliptic.Unmarshal(secp256k1.S256(), s)
+ return &ecdsa.PublicKey{secp256k1.S256(), x, y}, nil
}
func Sign(hash []byte, prv *ecdsa.PrivateKey) (sig []byte, err error) {
diff --git a/crypto/crypto_test.go b/crypto/crypto_test.go
index fdd9c1ee8..d5e19a4bb 100644
--- a/crypto/crypto_test.go
+++ b/crypto/crypto_test.go
@@ -181,7 +181,7 @@ func TestValidateSignatureValues(t *testing.T) {
minusOne := big.NewInt(-1)
one := common.Big1
zero := common.Big0
- secp256k1nMinus1 := new(big.Int).Sub(secp256k1n, common.Big1)
+ secp256k1nMinus1 := new(big.Int).Sub(secp256k1.N, common.Big1)
// correct v,r,s
check(true, 27, one, one)
@@ -208,9 +208,9 @@ func TestValidateSignatureValues(t *testing.T) {
// correct sig with max r,s
check(true, 27, secp256k1nMinus1, secp256k1nMinus1)
// correct v, combinations of incorrect r,s at upper limit
- check(false, 27, secp256k1n, secp256k1nMinus1)
- check(false, 27, secp256k1nMinus1, secp256k1n)
- check(false, 27, secp256k1n, secp256k1n)
+ check(false, 27, secp256k1.N, secp256k1nMinus1)
+ check(false, 27, secp256k1nMinus1, secp256k1.N)
+ check(false, 27, secp256k1.N, secp256k1.N)
// current callers ensures r,s cannot be negative, but let's test for that too
// as crypto package could be used stand-alone
diff --git a/crypto/ecies/asn1.go b/crypto/ecies/asn1.go
index 6eaf3d2ca..40dabd329 100644
--- a/crypto/ecies/asn1.go
+++ b/crypto/ecies/asn1.go
@@ -41,6 +41,8 @@ import (
"fmt"
"hash"
"math/big"
+
+ "github.com/ethereum/go-ethereum/crypto/secp256k1"
)
var (
@@ -81,6 +83,7 @@ func doScheme(base, v []int) asn1.ObjectIdentifier {
type secgNamedCurve asn1.ObjectIdentifier
var (
+ secgNamedCurveS256 = secgNamedCurve{1, 3, 132, 0, 10}
secgNamedCurveP256 = secgNamedCurve{1, 2, 840, 10045, 3, 1, 7}
secgNamedCurveP384 = secgNamedCurve{1, 3, 132, 0, 34}
secgNamedCurveP521 = secgNamedCurve{1, 3, 132, 0, 35}
@@ -116,6 +119,8 @@ func (curve secgNamedCurve) Equal(curve2 secgNamedCurve) bool {
func namedCurveFromOID(curve secgNamedCurve) elliptic.Curve {
switch {
+ case curve.Equal(secgNamedCurveS256):
+ return secp256k1.S256()
case curve.Equal(secgNamedCurveP256):
return elliptic.P256()
case curve.Equal(secgNamedCurveP384):
@@ -134,6 +139,8 @@ func oidFromNamedCurve(curve elliptic.Curve) (secgNamedCurve, bool) {
return secgNamedCurveP384, true
case elliptic.P521():
return secgNamedCurveP521, true
+ case secp256k1.S256():
+ return secgNamedCurveS256, true
}
return nil, false
diff --git a/crypto/ecies/ecies.go b/crypto/ecies/ecies.go
index a3b520dd5..65dc5b38b 100644
--- a/crypto/ecies/ecies.go
+++ b/crypto/ecies/ecies.go
@@ -125,6 +125,7 @@ func (prv *PrivateKey) GenerateShared(pub *PublicKey, skLen, macLen int) (sk []b
if skLen+macLen > MaxSharedKeyLength(pub) {
return nil, ErrSharedKeyTooBig
}
+
x, _ := pub.Curve.ScalarMult(pub.X, pub.Y, prv.D.Bytes())
if x == nil {
return nil, ErrSharedKeyIsPointAtInfinity
diff --git a/crypto/ecies/ecies_test.go b/crypto/ecies/ecies_test.go
index 1c391f938..6a0ea3f02 100644
--- a/crypto/ecies/ecies_test.go
+++ b/crypto/ecies/ecies_test.go
@@ -31,13 +31,18 @@ package ecies
import (
"bytes"
+ "crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/sha256"
+ "encoding/hex"
"flag"
"fmt"
"io/ioutil"
+ "math/big"
"testing"
+
+ "github.com/ethereum/go-ethereum/crypto/secp256k1"
)
var dumpEnc bool
@@ -65,7 +70,6 @@ func TestKDF(t *testing.T) {
}
}
-var skLen int
var ErrBadSharedKeys = fmt.Errorf("ecies: shared keys don't match")
// cmpParams compares a set of ECIES parameters. We assume, as per the
@@ -117,7 +121,7 @@ func TestSharedKey(t *testing.T) {
fmt.Println(err.Error())
t.FailNow()
}
- skLen = MaxSharedKeyLength(&prv1.PublicKey) / 2
+ skLen := MaxSharedKeyLength(&prv1.PublicKey) / 2
prv2, err := GenerateKey(rand.Reader, DefaultCurve, nil)
if err != nil {
@@ -143,6 +147,44 @@ func TestSharedKey(t *testing.T) {
}
}
+func TestSharedKeyPadding(t *testing.T) {
+ // sanity checks
+ prv0 := hexKey("1adf5c18167d96a1f9a0b1ef63be8aa27eaf6032c233b2b38f7850cf5b859fd9")
+ prv1 := hexKey("97a076fc7fcd9208240668e31c9abee952cbb6e375d1b8febc7499d6e16f1a")
+ x0, _ := new(big.Int).SetString("1a8ed022ff7aec59dc1b440446bdda5ff6bcb3509a8b109077282b361efffbd8", 16)
+ x1, _ := new(big.Int).SetString("6ab3ac374251f638d0abb3ef596d1dc67955b507c104e5f2009724812dc027b8", 16)
+ y0, _ := new(big.Int).SetString("e040bd480b1deccc3bc40bd5b1fdcb7bfd352500b477cb9471366dbd4493f923", 16)
+ y1, _ := new(big.Int).SetString("8ad915f2b503a8be6facab6588731fefeb584fd2dfa9a77a5e0bba1ec439e4fa", 16)
+
+ if prv0.PublicKey.X.Cmp(x0) != 0 {
+ t.Errorf("mismatched prv0.X:\nhave: %x\nwant: %x\n", prv0.PublicKey.X.Bytes(), x0.Bytes())
+ }
+ if prv0.PublicKey.Y.Cmp(y0) != 0 {
+ t.Errorf("mismatched prv0.Y:\nhave: %x\nwant: %x\n", prv0.PublicKey.Y.Bytes(), y0.Bytes())
+ }
+ if prv1.PublicKey.X.Cmp(x1) != 0 {
+ t.Errorf("mismatched prv1.X:\nhave: %x\nwant: %x\n", prv1.PublicKey.X.Bytes(), x1.Bytes())
+ }
+ if prv1.PublicKey.Y.Cmp(y1) != 0 {
+ t.Errorf("mismatched prv1.Y:\nhave: %x\nwant: %x\n", prv1.PublicKey.Y.Bytes(), y1.Bytes())
+ }
+
+ // test shared secret generation
+ sk1, err := prv0.GenerateShared(&prv1.PublicKey, 16, 16)
+ if err != nil {
+ fmt.Println(err.Error())
+ }
+
+ sk2, err := prv1.GenerateShared(&prv0.PublicKey, 16, 16)
+ if err != nil {
+ t.Fatal(err.Error())
+ }
+
+ if !bytes.Equal(sk1, sk2) {
+ t.Fatal(ErrBadSharedKeys.Error())
+ }
+}
+
// Verify that the key generation code fails when too much key data is
// requested.
func TestTooBigSharedKey(t *testing.T) {
@@ -158,13 +200,13 @@ func TestTooBigSharedKey(t *testing.T) {
t.FailNow()
}
- _, err = prv1.GenerateShared(&prv2.PublicKey, skLen*2, skLen*2)
+ _, err = prv1.GenerateShared(&prv2.PublicKey, 32, 32)
if err != ErrSharedKeyTooBig {
fmt.Println("ecdh: shared key should be too large for curve")
t.FailNow()
}
- _, err = prv2.GenerateShared(&prv1.PublicKey, skLen*2, skLen*2)
+ _, err = prv2.GenerateShared(&prv1.PublicKey, 32, 32)
if err != ErrSharedKeyTooBig {
fmt.Println("ecdh: shared key should be too large for curve")
t.FailNow()
@@ -176,25 +218,21 @@ func TestTooBigSharedKey(t *testing.T) {
func TestMarshalPublic(t *testing.T) {
prv, err := GenerateKey(rand.Reader, DefaultCurve, nil)
if err != nil {
- fmt.Println(err.Error())
- t.FailNow()
+ t.Fatalf("GenerateKey error: %s", err)
}
out, err := MarshalPublic(&prv.PublicKey)
if err != nil {
- fmt.Println(err.Error())
- t.FailNow()
+ t.Fatalf("MarshalPublic error: %s", err)
}
pub, err := UnmarshalPublic(out)
if err != nil {
- fmt.Println(err.Error())
- t.FailNow()
+ t.Fatalf("UnmarshalPublic error: %s", err)
}
if !cmpPublic(prv.PublicKey, *pub) {
- fmt.Println("ecies: failed to unmarshal public key")
- t.FailNow()
+ t.Fatal("ecies: failed to unmarshal public key")
}
}
@@ -304,9 +342,26 @@ func BenchmarkGenSharedKeyP256(b *testing.B) {
fmt.Println(err.Error())
b.FailNow()
}
+ b.ResetTimer()
+ for i := 0; i < b.N; i++ {
+ _, err := prv.GenerateShared(&prv.PublicKey, 16, 16)
+ if err != nil {
+ fmt.Println(err.Error())
+ b.FailNow()
+ }
+ }
+}
+// Benchmark the generation of S256 shared keys.
+func BenchmarkGenSharedKeyS256(b *testing.B) {
+ prv, err := GenerateKey(rand.Reader, secp256k1.S256(), nil)
+ if err != nil {
+ fmt.Println(err.Error())
+ b.FailNow()
+ }
+ b.ResetTimer()
for i := 0; i < b.N; i++ {
- _, err := prv.GenerateShared(&prv.PublicKey, skLen, skLen)
+ _, err := prv.GenerateShared(&prv.PublicKey, 16, 16)
if err != nil {
fmt.Println(err.Error())
b.FailNow()
@@ -511,3 +566,43 @@ func TestBasicKeyValidation(t *testing.T) {
}
}
}
+
+// Verify GenerateShared against static values - useful when
+// debugging changes in underlying libs
+func TestSharedKeyStatic(t *testing.T) {
+ prv1 := hexKey("7ebbc6a8358bc76dd73ebc557056702c8cfc34e5cfcd90eb83af0347575fd2ad")
+ prv2 := hexKey("6a3d6396903245bba5837752b9e0348874e72db0c4e11e9c485a81b4ea4353b9")
+
+ skLen := MaxSharedKeyLength(&prv1.PublicKey) / 2
+
+ sk1, err := prv1.GenerateShared(&prv2.PublicKey, skLen, skLen)
+ if err != nil {
+ fmt.Println(err.Error())
+ t.FailNow()
+ }
+
+ sk2, err := prv2.GenerateShared(&prv1.PublicKey, skLen, skLen)
+ if err != nil {
+ fmt.Println(err.Error())
+ t.FailNow()
+ }
+
+ if !bytes.Equal(sk1, sk2) {
+ fmt.Println(ErrBadSharedKeys.Error())
+ t.FailNow()
+ }
+
+ sk, _ := hex.DecodeString("167ccc13ac5e8a26b131c3446030c60fbfac6aa8e31149d0869f93626a4cdf62")
+ if !bytes.Equal(sk1, sk) {
+ t.Fatalf("shared secret mismatch: want: %x have: %x", sk, sk1)
+ }
+}
+
+// TODO: remove after refactoring packages crypto and crypto/ecies
+func hexKey(prv string) *PrivateKey {
+ priv := new(ecdsa.PrivateKey)
+ priv.PublicKey.Curve = secp256k1.S256()
+ priv.D, _ = new(big.Int).SetString(prv, 16)
+ priv.PublicKey.X, priv.PublicKey.Y = secp256k1.S256().ScalarBaseMult(priv.D.Bytes())
+ return ImportECDSA(priv)
+}
diff --git a/crypto/ecies/params.go b/crypto/ecies/params.go
index 97ddb0973..511c53ebc 100644
--- a/crypto/ecies/params.go
+++ b/crypto/ecies/params.go
@@ -41,13 +41,12 @@ import (
"crypto/sha512"
"fmt"
"hash"
-)
-// The default curve for this package is the NIST P256 curve, which
-// provides security equivalent to AES-128.
-var DefaultCurve = elliptic.P256()
+ "github.com/ethereum/go-ethereum/crypto/secp256k1"
+)
var (
+ DefaultCurve = secp256k1.S256()
ErrUnsupportedECDHAlgorithm = fmt.Errorf("ecies: unsupported ECDH algorithm")
ErrUnsupportedECIESParameters = fmt.Errorf("ecies: unsupported ECIES parameters")
)
@@ -101,9 +100,10 @@ var (
)
var paramsFromCurve = map[elliptic.Curve]*ECIESParams{
- elliptic.P256(): ECIES_AES128_SHA256,
- elliptic.P384(): ECIES_AES256_SHA384,
- elliptic.P521(): ECIES_AES256_SHA512,
+ secp256k1.S256(): ECIES_AES128_SHA256,
+ elliptic.P256(): ECIES_AES128_SHA256,
+ elliptic.P384(): ECIES_AES256_SHA384,
+ elliptic.P521(): ECIES_AES256_SHA512,
}
func AddParamsForCurve(curve elliptic.Curve, params *ECIESParams) {
diff --git a/crypto/key.go b/crypto/key.go
index 4ec43dfd7..ccf284ad8 100644
--- a/crypto/key.go
+++ b/crypto/key.go
@@ -25,6 +25,7 @@ import (
"strings"
"github.com/ethereum/go-ethereum/common"
+ "github.com/ethereum/go-ethereum/crypto/secp256k1"
"github.com/pborman/uuid"
)
@@ -137,7 +138,7 @@ func NewKey(rand io.Reader) *Key {
panic("key generation: could not read from random source: " + err.Error())
}
reader := bytes.NewReader(randBytes)
- privateKeyECDSA, err := ecdsa.GenerateKey(S256(), reader)
+ privateKeyECDSA, err := ecdsa.GenerateKey(secp256k1.S256(), reader)
if err != nil {
panic("key generation: ecdsa.GenerateKey failed: " + err.Error())
}
@@ -155,7 +156,7 @@ func NewKeyForDirectICAP(rand io.Reader) *Key {
panic("key generation: could not read from random source: " + err.Error())
}
reader := bytes.NewReader(randBytes)
- privateKeyECDSA, err := ecdsa.GenerateKey(S256(), reader)
+ privateKeyECDSA, err := ecdsa.GenerateKey(secp256k1.S256(), reader)
if err != nil {
panic("key generation: ecdsa.GenerateKey failed: " + err.Error())
}
diff --git a/crypto/curve.go b/crypto/secp256k1/curve.go
index 48f3f5e9c..6e44a6771 100644
--- a/crypto/curve.go
+++ b/crypto/secp256k1/curve.go
@@ -29,15 +29,22 @@
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-package crypto
+package secp256k1
import (
"crypto/elliptic"
"io"
"math/big"
"sync"
+ "unsafe"
)
+/*
+#include "libsecp256k1/include/secp256k1.h"
+extern int secp256k1_pubkey_scalar_mul(const secp256k1_context* ctx, const unsigned char *point, const unsigned char *scalar);
+*/
+import "C"
+
// This code is from https://github.com/ThePiachu/GoBit and implements
// several Koblitz elliptic curves over prime fields.
//
@@ -211,44 +218,37 @@ func (BitCurve *BitCurve) doubleJacobian(x, y, z *big.Int) (*big.Int, *big.Int,
return x3, y3, z3
}
-//TODO: double check if it is okay
-// ScalarMult returns k*(Bx,By) where k is a number in big-endian form.
-func (BitCurve *BitCurve) ScalarMult(Bx, By *big.Int, k []byte) (*big.Int, *big.Int) {
- // We have a slight problem in that the identity of the group (the
- // point at infinity) cannot be represented in (x, y) form on a finite
- // machine. Thus the standard add/double algorithm has to be tweaked
- // slightly: our initial state is not the identity, but x, and we
- // ignore the first true bit in |k|. If we don't find any true bits in
- // |k|, then we return nil, nil, because we cannot return the identity
- // element.
-
- Bz := new(big.Int).SetInt64(1)
- x := Bx
- y := By
- z := Bz
-
- seenFirstTrue := false
- for _, byte := range k {
- for bitNum := 0; bitNum < 8; bitNum++ {
- if seenFirstTrue {
- x, y, z = BitCurve.doubleJacobian(x, y, z)
- }
- if byte&0x80 == 0x80 {
- if !seenFirstTrue {
- seenFirstTrue = true
- } else {
- x, y, z = BitCurve.addJacobian(Bx, By, Bz, x, y, z)
- }
- }
- byte <<= 1
- }
+func (BitCurve *BitCurve) ScalarMult(Bx, By *big.Int, scalar []byte) (*big.Int, *big.Int) {
+ // Ensure scalar is exactly 32 bytes. We pad always, even if
+ // scalar is 32 bytes long, to avoid a timing side channel.
+ if len(scalar) > 32 {
+ panic("can't handle scalars > 256 bits")
}
-
- if !seenFirstTrue {
+ padded := make([]byte, 32)
+ copy(padded[32-len(scalar):], scalar)
+ scalar = padded
+
+ // Do the multiplication in C, updating point.
+ point := make([]byte, 64)
+ readBits(point[:32], Bx)
+ readBits(point[32:], By)
+ pointPtr := (*C.uchar)(unsafe.Pointer(&point[0]))
+ scalarPtr := (*C.uchar)(unsafe.Pointer(&scalar[0]))
+ res := C.secp256k1_pubkey_scalar_mul(context, pointPtr, scalarPtr)
+
+ // Unpack the result and clear temporaries.
+ x := new(big.Int).SetBytes(point[:32])
+ y := new(big.Int).SetBytes(point[32:])
+ for i := range point {
+ point[i] = 0
+ }
+ for i := range padded {
+ scalar[i] = 0
+ }
+ if res != 1 {
return nil, nil
}
-
- return BitCurve.affineFromJacobian(x, y, z)
+ return x, y
}
// ScalarBaseMult returns k*G, where G is the base point of the group and k is
@@ -312,86 +312,24 @@ func (BitCurve *BitCurve) Unmarshal(data []byte) (x, y *big.Int) {
return
}
-//curve parameters taken from:
-//http://www.secg.org/collateral/sec2_final.pdf
-
-var initonce sync.Once
-var ecp160k1 *BitCurve
-var ecp192k1 *BitCurve
-var ecp224k1 *BitCurve
-var ecp256k1 *BitCurve
-
-func initAll() {
- initS160()
- initS192()
- initS224()
- initS256()
-}
-
-func initS160() {
- // See SEC 2 section 2.4.1
- ecp160k1 = new(BitCurve)
- ecp160k1.P, _ = new(big.Int).SetString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFAC73", 16)
- ecp160k1.N, _ = new(big.Int).SetString("0100000000000000000001B8FA16DFAB9ACA16B6B3", 16)
- ecp160k1.B, _ = new(big.Int).SetString("0000000000000000000000000000000000000007", 16)
- ecp160k1.Gx, _ = new(big.Int).SetString("3B4C382CE37AA192A4019E763036F4F5DD4D7EBB", 16)
- ecp160k1.Gy, _ = new(big.Int).SetString("938CF935318FDCED6BC28286531733C3F03C4FEE", 16)
- ecp160k1.BitSize = 160
-}
-
-func initS192() {
- // See SEC 2 section 2.5.1
- ecp192k1 = new(BitCurve)
- ecp192k1.P, _ = new(big.Int).SetString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFEE37", 16)
- ecp192k1.N, _ = new(big.Int).SetString("FFFFFFFFFFFFFFFFFFFFFFFE26F2FC170F69466A74DEFD8D", 16)
- ecp192k1.B, _ = new(big.Int).SetString("000000000000000000000000000000000000000000000003", 16)
- ecp192k1.Gx, _ = new(big.Int).SetString("DB4FF10EC057E9AE26B07D0280B7F4341DA5D1B1EAE06C7D", 16)
- ecp192k1.Gy, _ = new(big.Int).SetString("9B2F2F6D9C5628A7844163D015BE86344082AA88D95E2F9D", 16)
- ecp192k1.BitSize = 192
-}
-
-func initS224() {
- // See SEC 2 section 2.6.1
- ecp224k1 = new(BitCurve)
- ecp224k1.P, _ = new(big.Int).SetString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFE56D", 16)
- ecp224k1.N, _ = new(big.Int).SetString("010000000000000000000000000001DCE8D2EC6184CAF0A971769FB1F7", 16)
- ecp224k1.B, _ = new(big.Int).SetString("00000000000000000000000000000000000000000000000000000005", 16)
- ecp224k1.Gx, _ = new(big.Int).SetString("A1455B334DF099DF30FC28A169A467E9E47075A90F7E650EB6B7A45C", 16)
- ecp224k1.Gy, _ = new(big.Int).SetString("7E089FED7FBA344282CAFBD6F7E319F7C0B0BD59E2CA4BDB556D61A5", 16)
- ecp224k1.BitSize = 224
-}
-
-func initS256() {
- // See SEC 2 section 2.7.1
- ecp256k1 = new(BitCurve)
- ecp256k1.P, _ = new(big.Int).SetString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F", 16)
- ecp256k1.N, _ = new(big.Int).SetString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141", 16)
- ecp256k1.B, _ = new(big.Int).SetString("0000000000000000000000000000000000000000000000000000000000000007", 16)
- ecp256k1.Gx, _ = new(big.Int).SetString("79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798", 16)
- ecp256k1.Gy, _ = new(big.Int).SetString("483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8", 16)
- ecp256k1.BitSize = 256
-}
-
-// S160 returns a BitCurve which implements secp160k1 (see SEC 2 section 2.4.1)
-func S160() *BitCurve {
- initonce.Do(initAll)
- return ecp160k1
-}
-
-// S192 returns a BitCurve which implements secp192k1 (see SEC 2 section 2.5.1)
-func S192() *BitCurve {
- initonce.Do(initAll)
- return ecp192k1
-}
-
-// S224 returns a BitCurve which implements secp224k1 (see SEC 2 section 2.6.1)
-func S224() *BitCurve {
- initonce.Do(initAll)
- return ecp224k1
-}
+var (
+ initonce sync.Once
+ theCurve *BitCurve
+)
// S256 returns a BitCurve which implements secp256k1 (see SEC 2 section 2.7.1)
func S256() *BitCurve {
- initonce.Do(initAll)
- return ecp256k1
+ initonce.Do(func() {
+ // See SEC 2 section 2.7.1
+ // curve parameters taken from:
+ // http://www.secg.org/collateral/sec2_final.pdf
+ theCurve = new(BitCurve)
+ theCurve.P, _ = new(big.Int).SetString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F", 16)
+ theCurve.N, _ = new(big.Int).SetString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141", 16)
+ theCurve.B, _ = new(big.Int).SetString("0000000000000000000000000000000000000000000000000000000000000007", 16)
+ theCurve.Gx, _ = new(big.Int).SetString("79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798", 16)
+ theCurve.Gy, _ = new(big.Int).SetString("483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8", 16)
+ theCurve.BitSize = 256
+ })
+ return theCurve
}
diff --git a/crypto/secp256k1/curve_test.go b/crypto/secp256k1/curve_test.go
new file mode 100644
index 000000000..d915ee852
--- /dev/null
+++ b/crypto/secp256k1/curve_test.go
@@ -0,0 +1,39 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package secp256k1
+
+import (
+ "bytes"
+ "encoding/hex"
+ "math/big"
+ "testing"
+)
+
+func TestReadBits(t *testing.T) {
+ check := func(input string) {
+ want, _ := hex.DecodeString(input)
+ int, _ := new(big.Int).SetString(input, 16)
+ buf := make([]byte, len(want))
+ readBits(buf, int)
+ if !bytes.Equal(buf, want) {
+ t.Errorf("have: %x\nwant: %x", buf, want)
+ }
+ }
+ check("000000000000000000000000000000000000000000000000000000FEFCF3F8F0")
+ check("0000000000012345000000000000000000000000000000000000FEFCF3F8F0")
+ check("18F8F8F1000111000110011100222004330052300000000000000000FEFCF3F8F0")
+}
diff --git a/crypto/secp256k1/pubkey_scalar_mul.h b/crypto/secp256k1/pubkey_scalar_mul.h
new file mode 100644
index 000000000..0511545ec
--- /dev/null
+++ b/crypto/secp256k1/pubkey_scalar_mul.h
@@ -0,0 +1,56 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+/** Multiply point by scalar in constant time.
+ * Returns: 1: multiplication was successful
+ * 0: scalar was invalid (zero or overflow)
+ * Args: ctx: pointer to a context object (cannot be NULL)
+ * Out: point: the multiplied point (usually secret)
+ * In: point: pointer to a 64-byte bytepublic point,
+ encoded as two 256bit big-endian numbers.
+ * scalar: a 32-byte scalar with which to multiply the point
+ */
+int secp256k1_pubkey_scalar_mul(const secp256k1_context* ctx, unsigned char *point, const unsigned char *scalar) {
+ int ret = 0;
+ int overflow = 0;
+ secp256k1_fe feX, feY;
+ secp256k1_gej res;
+ secp256k1_ge ge;
+ secp256k1_scalar s;
+ ARG_CHECK(point != NULL);
+ ARG_CHECK(scalar != NULL);
+ (void)ctx;
+
+ secp256k1_fe_set_b32(&feX, point);
+ secp256k1_fe_set_b32(&feY, point+32);
+ secp256k1_ge_set_xy(&ge, &feX, &feY);
+ secp256k1_scalar_set_b32(&s, scalar, &overflow);
+ if (overflow || secp256k1_scalar_is_zero(&s)) {
+ ret = 0;
+ } else {
+ secp256k1_ecmult_const(&res, &ge, &s);
+ secp256k1_ge_set_gej(&ge, &res);
+ /* Note: can't use secp256k1_pubkey_save here because it is not constant time. */
+ secp256k1_fe_normalize(&ge.x);
+ secp256k1_fe_normalize(&ge.y);
+ secp256k1_fe_get_b32(point, &ge.x);
+ secp256k1_fe_get_b32(point+32, &ge.y);
+ ret = 1;
+ }
+ secp256k1_scalar_clear(&s);
+ return ret;
+}
+
diff --git a/crypto/secp256k1/secp256.go b/crypto/secp256k1/secp256.go
index 7f26f307c..8dc248145 100644
--- a/crypto/secp256k1/secp256.go
+++ b/crypto/secp256k1/secp256.go
@@ -20,6 +20,7 @@ package secp256k1
/*
#cgo CFLAGS: -I./libsecp256k1
+#cgo CFLAGS: -I./libsecp256k1/src/
#cgo darwin CFLAGS: -I/usr/local/include
#cgo freebsd CFLAGS: -I/usr/local/include
#cgo linux,arm CFLAGS: -I/usr/local/arm/include
@@ -35,6 +36,7 @@ package secp256k1
#define NDEBUG
#include "./libsecp256k1/src/secp256k1.c"
#include "./libsecp256k1/src/modules/recovery/main_impl.h"
+#include "pubkey_scalar_mul.h"
typedef void (*callbackFunc) (const char* msg, void* data);
extern void secp256k1GoPanicIllegal(const char* msg, void* data);
@@ -44,6 +46,7 @@ import "C"
import (
"errors"
+ "math/big"
"unsafe"
"github.com/ethereum/go-ethereum/crypto/randentropy"
@@ -56,13 +59,16 @@ import (
> store private keys in buffer and shuffle (deters persistance on swap disc)
> byte permutation (changing)
> xor with chaning random block (to deter scanning memory for 0x63) (stream cipher?)
- > on disk: store keys in wallets
*/
// holds ptr to secp256k1_context_struct (see secp256k1/include/secp256k1.h)
-var context *C.secp256k1_context
+var (
+ context *C.secp256k1_context
+ N *big.Int
+)
func init() {
+ N, _ = new(big.Int).SetString("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141", 16)
// around 20 ms on a modern CPU.
context = C.secp256k1_context_create(3) // SECP256K1_START_SIGN | SECP256K1_START_VERIFY
C.secp256k1_context_set_illegal_callback(context, C.callbackFunc(C.secp256k1GoPanicIllegal), nil)
@@ -78,7 +84,6 @@ var (
func GenerateKeyPair() ([]byte, []byte) {
var seckey []byte = randentropy.GetEntropyCSPRNG(32)
var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))
-
var pubkey64 []byte = make([]byte, 64) // secp256k1_pubkey
var pubkey65 []byte = make([]byte, 65) // 65 byte uncompressed pubkey
pubkey64_ptr := (*C.secp256k1_pubkey)(unsafe.Pointer(&pubkey64[0]))
@@ -96,7 +101,7 @@ func GenerateKeyPair() ([]byte, []byte) {
var output_len C.size_t
- _ = C.secp256k1_ec_pubkey_serialize( // always returns 1
+ C.secp256k1_ec_pubkey_serialize( // always returns 1
context,
pubkey65_ptr,
&output_len,
@@ -163,7 +168,7 @@ func Sign(msg []byte, seckey []byte) ([]byte, error) {
sig_serialized_ptr := (*C.uchar)(unsafe.Pointer(&sig_serialized[0]))
var recid C.int
- _ = C.secp256k1_ecdsa_recoverable_signature_serialize_compact(
+ C.secp256k1_ecdsa_recoverable_signature_serialize_compact(
context,
sig_serialized_ptr, // 64 byte compact signature
&recid,
@@ -254,3 +259,16 @@ func checkSignature(sig []byte) error {
}
return nil
}
+
+// reads num into buf as big-endian bytes.
+func readBits(buf []byte, num *big.Int) {
+ const wordLen = int(unsafe.Sizeof(big.Word(0)))
+ i := len(buf)
+ for _, d := range num.Bits() {
+ for j := 0; j < wordLen && i > 0; j++ {
+ i--
+ buf[i] = byte(d)
+ d >>= 8
+ }
+ }
+}
diff --git a/crypto/secp256k1/secp256_test.go b/crypto/secp256k1/secp256_test.go
index d3ff2223d..fc6fc9b32 100644
--- a/crypto/secp256k1/secp256_test.go
+++ b/crypto/secp256k1/secp256_test.go
@@ -24,7 +24,7 @@ import (
"github.com/ethereum/go-ethereum/crypto/randentropy"
)
-const TestCount = 10000
+const TestCount = 1000
func TestPrivkeyGenerate(t *testing.T) {
_, seckey := GenerateKeyPair()
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-16 12:44:40 +0800