// Copyright 2018 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package ecdsa_test import ( "crypto/ecdsa" "crypto/elliptic" "crypto/rand" "crypto/sha256" "fmt" ) func Example() { privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader) if err != nil { panic(err) } msg := "hello, world" hash := sha256.Sum256([]byte(msg)) sig, err := ecdsa.SignASN1(rand.Reader, privateKey, hash[:]) if err != nil { panic(err) } fmt.Printf("signature: %x\n", sig) valid := ecdsa.VerifyASN1(&privateKey.PublicKey, hash[:], sig) fmt.Println("signature verified:", valid) }