go-nostr/keys.go
fiatjaf 329b8d44d2
move stuff back from nostr package to top level.
because otherwise the path must be specified as github.com/fiatjaf/go-nostr/nostr, which is annoying.
2022-11-04 08:22:13 -03:00

40 lines
727 B
Go

package nostr
import (
"crypto/rand"
"encoding/hex"
"io"
"math/big"
"github.com/btcsuite/btcd/btcec/v2"
"github.com/btcsuite/btcd/btcec/v2/schnorr"
)
func GeneratePrivateKey() string {
params := btcec.S256().Params()
one := new(big.Int).SetInt64(1)
b := make([]byte, params.BitSize/8+8)
_, err := io.ReadFull(rand.Reader, b)
if err != nil {
return ""
}
k := new(big.Int).SetBytes(b)
n := new(big.Int).Sub(params.N, one)
k.Mod(k, n)
k.Add(k, one)
return hex.EncodeToString(k.Bytes())
}
func GetPublicKey(sk string) (string, error) {
b, err := hex.DecodeString(sk)
if err != nil {
return "", err
}
_, pk := btcec.PrivKeyFromBytes(b)
return hex.EncodeToString(schnorr.SerializePubKey(pk)), nil
}