examples/keygen: add a simple key pair generator.

Add examples/keygen for generating public/private key pairs for
authentication.

Signed-off-by: Krisztian Litkey <krisztian.litkey@intel.com>

Author: klihub

examples/keygen/keygen.go

@@ -0,0 +1,34 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package main
+
+import (
+	"fmt"
+
+	"github.com/containerd/nri/pkg/auth"
+)
+
+// Generate and print a new key pair
+func main() {
+	private, public, err := auth.GenerateKeyPair()
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Printf("----- private key -----\n%s\n", private.Encode())
+	fmt.Printf("----- public key -----\n%s\n", public.Encode())
+}