127 lines
3.2 KiB
Go
127 lines
3.2 KiB
Go
package kademlia
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// 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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import (
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"crypto/ecdsa"
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"crypto/ed25519"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"flag"
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"log"
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"math/big"
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"net"
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"os"
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"strings"
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"time"
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)
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func publicKey(priv any) any {
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switch k := priv.(type) {
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case *rsa.PrivateKey:
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return &k.PublicKey
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case *ecdsa.PrivateKey:
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return &k.PublicKey
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case ed25519.PrivateKey:
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return k.Public().(ed25519.PublicKey)
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default:
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return nil
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}
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}
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func GenerateCert(host, certOutFile, keyOutFile string) {
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flag.Parse()
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if len(host) == 0 {
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log.Fatalf("Missing required --host parameter")
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}
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var priv any
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var err error
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priv, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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if err != nil {
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log.Fatalf("Failed to generate private key: %v", err)
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}
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// ECDSA, ED25519 and RSA subject keys should have the DigitalSignature
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// KeyUsage bits set in the x509.Certificate template
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keyUsage := x509.KeyUsageDigitalSignature
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var notBefore time.Time
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notBefore = time.Now()
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notAfter := notBefore.Add(365 * 24 * time.Hour)
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
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if err != nil {
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log.Fatalf("Failed to generate serial number: %v", err)
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}
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template := x509.Certificate{
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SerialNumber: serialNumber,
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Subject: pkix.Name{
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Organization: []string{"DHT inc"},
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},
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NotBefore: notBefore,
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NotAfter: notAfter,
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KeyUsage: keyUsage,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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BasicConstraintsValid: true,
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}
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hosts := strings.Split(host, ",")
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for _, h := range hosts {
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if ip := net.ParseIP(h); ip != nil {
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template.IPAddresses = append(template.IPAddresses, ip)
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} else {
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template.DNSNames = append(template.DNSNames, h)
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}
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}
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template.IsCA = true
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template.KeyUsage |= x509.KeyUsageCertSign
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derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(priv), priv)
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if err != nil {
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log.Fatalf("Failed to create certificate: %v", err)
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}
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certOut, err := os.Create(certOutFile)
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if err != nil {
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log.Fatalf("Failed to open %s for writing: %v", certOutFile, err)
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}
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if err := pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes}); err != nil {
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log.Fatalf("Failed to write data to %s: %v", certOutFile, err)
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}
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if err := certOut.Close(); err != nil {
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log.Fatalf("Error closing %s: %v", certOutFile, err)
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}
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keyOut, err := os.OpenFile(keyOutFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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log.Fatalf("Failed to open %s for writing: %v", keyOutFile, err)
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}
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privBytes, err := x509.MarshalPKCS8PrivateKey(priv)
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if err != nil {
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log.Fatalf("Unable to marshal private key: %v", err)
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}
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if err := pem.Encode(keyOut, &pem.Block{Type: "PRIVATE KEY", Bytes: privBytes}); err != nil {
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log.Fatalf("Failed to write data to %s: %v", keyOutFile, err)
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}
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if err := keyOut.Close(); err != nil {
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log.Fatalf("Error closing %s: %v", keyOutFile, err)
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}
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}
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