forks/go-ethereum
1
0
Fork 1
mirror of https://github.com/ethereum/go-ethereum.git synced 2026-08-17 01:13:45 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

crypto/secp256k1: avoid synchronization in S256

Browse source
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
Show stats Download patch file Download diff file Expand all files Collapse all files

16
crypto/secp256k1/curve.go
View file

@ -34,7 +34,6 @@ package secp256k1
import (
"crypto/elliptic"
"math/big"
"sync"
"unsafe"
"github.com/ethereum/go-ethereum/common/math"
@ -285,24 +284,21 @@ func (BitCurve *BitCurve) Unmarshal(data []byte) (x, y *big.Int) {
return
}
var (
initonce sync.Once
theCurve *BitCurve
)
var theCurve = new(BitCurve)
// S256 returns a BitCurve which implements secp256k1 (see SEC 2 section 2.7.1)
func S256() *BitCurve {
initonce.Do(func() {
func init() {
// 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
})
}
// S256 returns a BitCurve which implements secp256k1.
func S256() *BitCurve {
return theCurve
}