forks/go-ethereum
1
0
Fork 1
mirror of https://github.com/ethereum/go-ethereum.git synced 2026-08-17 09:23:48 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

crypto/secp256k1: use ReadBits in Marshal

Browse source
This commit is contained in:
Felix Lange 2017-12-07 13:26:29 +01:00
parent 689c7d630a
commit 474f849048
1 changed files with 3 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
crypto/secp256k1/curve.go
View file

@ -263,14 +263,10 @@ func (BitCurve *BitCurve) ScalarBaseMult(k []byte) (*big.Int, *big.Int) {
// X9.62. // X9.62.
func (BitCurve *BitCurve) Marshal(x, y *big.Int) []byte { func (BitCurve *BitCurve) Marshal(x, y *big.Int) []byte {
byteLen := (BitCurve.BitSize + 7) >> 3 byteLen := (BitCurve.BitSize + 7) >> 3
ret := make([]byte, 1+2*byteLen) ret := make([]byte, 1+2*byteLen)
ret[0] = 4 // uncompressed point ret[0] = 4 // uncompressed point flag
math.ReadBits(x, ret[1:1+byteLen])
xBytes := x.Bytes() math.ReadBits(y, ret[1+byteLen:])
copy(ret[1+byteLen-len(xBytes):], xBytes)
yBytes := y.Bytes()
copy(ret[1+2*byteLen-len(yBytes):], yBytes)
return ret return ret
} }