76 lines
1.9 KiB
Go
76 lines
1.9 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Generate a self-signed X.509 certificate for a TLS server. Outputs to
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// 'cert.pem' and 'key.pem' and will overwrite existing files.
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package main
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import (
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"crypto/rsa"
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"crypto/x509"
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"encoding/pem"
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"flag"
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"log"
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"os"
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"time"
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)
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var hostName *string = flag.String("host", "127.0.0.1", "Hostname to generate a certificate for")
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func main() {
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flag.Parse()
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urandom, err := os.Open("/dev/urandom", os.O_RDONLY, 0)
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if err != nil {
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log.Exitf("failed to open /dev/urandom: %s", err)
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return
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}
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priv, err := rsa.GenerateKey(urandom, 1024)
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if err != nil {
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log.Exitf("failed to generate private key: %s", err)
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return
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}
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now := time.Seconds()
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template := x509.Certificate{
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SerialNumber: []byte{0},
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Subject: x509.Name{
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CommonName: *hostName,
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Organization: []string{"Acme Co"},
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},
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NotBefore: time.SecondsToUTC(now - 300),
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NotAfter: time.SecondsToUTC(now + 60*60*24*365), // valid for 1 year.
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SubjectKeyId: []byte{1, 2, 3, 4},
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KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
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}
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derBytes, err := x509.CreateCertificate(urandom, &template, &template, &priv.PublicKey, priv)
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if err != nil {
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log.Exitf("Failed to create certificate: %s", err)
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return
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}
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certOut, err := os.Open("cert.pem", os.O_WRONLY|os.O_CREAT, 0644)
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if err != nil {
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log.Exitf("failed to open cert.pem for writing: %s", err)
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return
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}
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pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
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certOut.Close()
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log.Print("written cert.pem\n")
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keyOut, err := os.Open("key.pem", os.O_WRONLY|os.O_CREAT, 0600)
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if err != nil {
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log.Print("failed to open key.pem for writing:", err)
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return
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}
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pem.Encode(keyOut, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
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keyOut.Close()
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log.Print("written key.pem\n")
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}
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