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selfsigncertgen.go
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/
selfsigncertgen.go
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package main
// Copyright (c) 2018, Arm Limited and affiliates.
// SPDX-License-Identifier: Apache-2.0
//
// 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.
import (
"bytes"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"log"
"math/big"
"os"
"time"
)
func publicKey(priv interface{}) interface{} {
switch k := priv.(type) {
case *rsa.PrivateKey:
return &k.PublicKey
case *ecdsa.PrivateKey:
return &k.PublicKey
default:
return nil
}
}
func pemBlockForKey(priv interface{}) *pem.Block {
switch k := priv.(type) {
case *rsa.PrivateKey:
return &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(k)}
case *ecdsa.PrivateKey:
b, err := x509.MarshalECPrivateKey(k)
if err != nil {
fmt.Fprintf(os.Stderr, "Unable to marshal ECDSA private key: %v", err)
os.Exit(2)
}
return &pem.Block{Type: "EC PRIVATE KEY", Bytes: b}
default:
return nil
}
}
func main() {
// priv, err := rsa.GenerateKey(rand.Reader, *rsaBits)
// priv, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
log.Fatal(err)
}
template := x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
Organization: []string{"012345678901234567890123456789ab"}, // OU is the account ID
CommonName: "012345678901234567890123456789ab", // CN is the device ID
},
NotBefore: time.Now(),
NotAfter: time.Now().Add(time.Hour * 24 * 365 * 35),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
SignatureAlgorithm: x509.ECDSAWithSHA256,
PublicKeyAlgorithm: x509.ECDSA,
}
/*
hosts := strings.Split(*host, ",")
for _, h := range hosts {
if ip := net.ParseIP(h); ip != nil {
template.IPAddresses = append(template.IPAddresses, ip)
} else {
template.DNSNames = append(template.DNSNames, h)
}
}
if *isCA {
template.IsCA = true
template.KeyUsage |= x509.KeyUsageCertSign
}
*/
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(priv), priv)
if err != nil {
log.Fatal("Failed to create certificate: ", err)
}
out := &bytes.Buffer{}
pem.Encode(out, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
fmt.Println(out.String())
out.Reset()
pem.Encode(out, pemBlockForKey(priv))
fmt.Println(out.String())
}