crypto/ecdsa: add a package level example

Change-Id: I4063d5ec4ac45561b94472b528583be564981912 Reviewed-on: https://go-review.googlesource.com/120144 Run-TryBot: Filippo Valsorda <[email protected]> TryBot-Result: Gobot Gobot <[email protected]> Reviewed-by: Filippo Valsorda <[email protected]>
golang · Aug 2, 2018 · db810b6 · db810b6
1 parent 25aaeaa
commit db810b6
Showing 1 changed file with 32 additions and 0 deletions.
diff --git a/src/crypto/ecdsa/example_test.go b/src/crypto/ecdsa/example_test.go
@@ -0,0 +1,32 @@
+// 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))
+
+	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)
+}