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crypto/secp256k1: avoid synchronization in S256

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This commit is contained in:
Felix Lange 2017-12-07 13:53:37 +01:00
parent 474f849048
commit 516c83d593
1 changed files with 14 additions and 18 deletions
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16
crypto/secp256k1/curve.go
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@ -34,7 +34,6 @@ package secp256k1
import ( import (
"crypto/elliptic" "crypto/elliptic"
"math/big" "math/big"
"sync"
"unsafe" "unsafe"
"github.com/ethereum/go-ethereum/common/math" "github.com/ethereum/go-ethereum/common/math"
@ -285,24 +284,21 @@ func (BitCurve *BitCurve) Unmarshal(data []byte) (x, y *big.Int) {
return return
} }
var ( var theCurve = new(BitCurve)
initonce sync.Once
theCurve *BitCurve
)
// S256 returns a BitCurve which implements secp256k1 (see SEC 2 section 2.7.1) func init() {
func S256() *BitCurve {
initonce.Do(func() {
// See SEC 2 section 2.7.1 // See SEC 2 section 2.7.1
// curve parameters taken from: // curve parameters taken from:
// http://www.secg.org/collateral/sec2_final.pdf // http://www.secg.org/collateral/sec2_final.pdf
theCurve = new(BitCurve)
theCurve.P, _ = new(big.Int).SetString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F", 16) theCurve.P, _ = new(big.Int).SetString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F", 16)
theCurve.N, _ = new(big.Int).SetString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141", 16) theCurve.N, _ = new(big.Int).SetString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141", 16)
theCurve.B, _ = new(big.Int).SetString("0000000000000000000000000000000000000000000000000000000000000007", 16) theCurve.B, _ = new(big.Int).SetString("0000000000000000000000000000000000000000000000000000000000000007", 16)
theCurve.Gx, _ = new(big.Int).SetString("79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798", 16) theCurve.Gx, _ = new(big.Int).SetString("79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798", 16)
theCurve.Gy, _ = new(big.Int).SetString("483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8", 16) theCurve.Gy, _ = new(big.Int).SetString("483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8", 16)
theCurve.BitSize = 256 theCurve.BitSize = 256
}) }
// S256 returns a BitCurve which implements secp256k1.
func S256() *BitCurve {
return theCurve return theCurve
} }