Source file src/crypto/ecdsa/example_test.go

Documentation: crypto/ecdsa

		 1  // Copyright 2018 The Go Authors. All rights reserved.
		 2  // Use of this source code is governed by a BSD-style
		 3  // license that can be found in the LICENSE file.
		 4  
		 5  package ecdsa_test
		 6  
		 7  import (
		 8  	"crypto/ecdsa"
		 9  	"crypto/elliptic"
		10  	"crypto/rand"
		11  	"crypto/sha256"
		12  	"fmt"
		13  )
		14  
		15  func Example() {
		16  	privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
		17  	if err != nil {
		18  		panic(err)
		19  	}
		20  
		21  	msg := "hello, world"
		22  	hash := sha256.Sum256([]byte(msg))
		23  
		24  	sig, err := ecdsa.SignASN1(rand.Reader, privateKey, hash[:])
		25  	if err != nil {
		26  		panic(err)
		27  	}
		28  	fmt.Printf("signature: %x\n", sig)
		29  
		30  	valid := ecdsa.VerifyASN1(&privateKey.PublicKey, hash[:], sig)
		31  	fmt.Println("signature verified:", valid)
		32  }
		33  

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