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// 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.
// +build gccgo_examples
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))
r, s, err := ecdsa.Sign(rand.Reader, privateKey, hash[:])
if err != nil {
panic(err)
}
fmt.Printf("signature: (0x%x, 0x%x)\n", r, s)
valid := ecdsa.Verify(&privateKey.PublicKey, hash[:], r, s)
fmt.Println("signature verified:", valid)
}
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