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package main
import ( "crypto/ecdsa" "crypto/rand" "crypto/sha256" "crypto/elliptic" "log" "fmt" )
func newKeyPair2() (ecdsa.PrivateKey, []byte) { curve := elliptic.P256() private, err := ecdsa.GenerateKey(curve, rand.Reader) if err != nil { log.Panic(err) } pubKey := append(private.PublicKey.X.Bytes(), private.PublicKey.Y.Bytes()...)
return *private, pubKey }
func main(){ privKey,_ := newKeyPair2()
hash := sha256.Sum256([]byte("hello world\n"))
r, s, err := ecdsa.Sign(rand.Reader, &privKey, hash[:])
if err != nil { log.Panic(err) }
signature := append(r.Bytes(), s.Bytes()...) fmt.Printf("%x\n", signature)
fmt.Printf("%x\n", r.Bytes()) fmt.Printf("%x\n", s.Bytes())
}
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