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