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275 lines
8.7 KiB
Go
275 lines
8.7 KiB
Go
// Copyright 2009 The Go Authors, 2015-2016 Jeremy Rand. 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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// This code has been modified from the stock Go code to generate
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// "dehydrated certificates", suitable for inclusion in a Namecoin name.
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package main
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import (
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"bytes"
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"crypto/ecdsa"
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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/base64"
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"encoding/pem"
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"flag"
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"fmt"
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"log"
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"math/big"
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"os"
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"time"
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"github.com/namecoin/ncdns/certdehydrate"
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"github.com/namecoin/ncdns/x509"
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)
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var (
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host = flag.String("host", "", "Hostname to generate a certificate for (only use one)")
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validFrom = flag.String("start-date", "", "Creation date formatted as Jan 1 15:04:05 2011")
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validTo = flag.String("end-date", "", "End date formatted as Jan 1 15:04:05 2011")
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ecdsaCurve = flag.String("ecdsa-curve", "", "ECDSA curve to use to generate a key. Valid values are P224, P256, P384, P521")
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falseHost = flag.String("false-host", "", "(Optional) Generate a false cert for this host; used to test x.509 implementations for safety regarding handling of the CA flag and KeyUsage")
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)
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func publicKey(priv interface{}) interface{} {
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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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default:
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return nil
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}
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}
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func pemBlockForKey(priv interface{}) *pem.Block {
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switch k := priv.(type) {
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case *rsa.PrivateKey:
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return &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(k)}
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case *ecdsa.PrivateKey:
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b, err := x509.MarshalECPrivateKey(k)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Unable to marshal ECDSA private key: %v", err)
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os.Exit(2)
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}
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return &pem.Block{Type: "EC PRIVATE KEY", Bytes: b}
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default:
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return nil
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}
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}
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func main() {
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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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if len(*validFrom) == 0 {
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log.Fatalf("Missing required --start-date parameter")
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}
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if len(*validTo) == 0 {
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log.Fatalf("Missing required --end-date parameter")
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}
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if len(*ecdsaCurve) == 0 {
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log.Fatalf("Missing required --ecdsa-curve parameter")
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}
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var priv interface{}
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var err error
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switch *ecdsaCurve {
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case "P224":
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priv, err = ecdsa.GenerateKey(elliptic.P224(), rand.Reader)
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case "P256":
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priv, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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case "P384":
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priv, err = ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
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case "P521":
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priv, err = ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
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default:
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fmt.Fprintf(os.Stderr, "Unrecognized elliptic curve: %q", *ecdsaCurve)
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os.Exit(1)
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}
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if err != nil {
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log.Fatalf("failed to generate private key: %s", err)
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}
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var notBefore time.Time
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notBefore, err = time.Parse("Jan 2 15:04:05 2006", *validFrom)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Failed to parse creation date: %s\n", err)
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os.Exit(1)
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}
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var notAfter time.Time
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notAfter, err = time.Parse("Jan 2 15:04:05 2006", *validTo)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Failed to parse expiry date: %s\n", err)
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os.Exit(1)
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}
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timestampPrecision := int64(5 * 60)
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notBeforeFloored := time.Unix( ( notBefore.Unix() / timestampPrecision ) * timestampPrecision, 0 )
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notAfterFloored := time.Unix( ( notAfter.Unix() / timestampPrecision ) * timestampPrecision, 0 )
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// Serial components
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pubkeyBytes, err := x509.MarshalPKIXPublicKey(publicKey(priv))
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if err != nil {
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log.Fatalf("failed to marshal public key: %s", err)
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}
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pubkeyB64 := base64.StdEncoding.EncodeToString(pubkeyBytes)
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notBeforeScaled := notBeforeFloored.Unix() / timestampPrecision
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notAfterScaled := notAfterFloored.Unix() / timestampPrecision
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// Calculate serial
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serialDehydrated := certdehydrate.DehydratedCertificate {
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PubkeyB64: pubkeyB64,
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NotBeforeScaled: notBeforeScaled,
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NotAfterScaled: notAfterScaled,
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}
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serialNumber := big.NewInt(1)
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serialNumberBytes, err := serialDehydrated.SerialNumber(*host)
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if err != nil {
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log.Fatalf("Error calculating serial number: %s", err)
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}
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serialNumber.SetBytes(serialNumberBytes)
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template := x509.Certificate{
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SerialNumber: serialNumber,
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Subject: pkix.Name{
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CommonName: *host,
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SerialNumber: "Namecoin TLS Certificate",
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},
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NotBefore: notBeforeFloored,
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NotAfter: notAfterFloored,
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// x509.KeyUsageKeyEncipherment is used for RSA key exchange, but not DHE/ECDHE key exchange. Since everyone should be using ECDHE (due to forward secrecy), we disallow x509.KeyUsageKeyEncipherment in our template.
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//KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
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KeyUsage: x509.KeyUsageDigitalSignature,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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BasicConstraintsValid: true,
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}
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template.DNSNames = append(template.DNSNames, *host)
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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: %s", err)
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}
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certOut, err := os.Create("cert.pem")
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if err != nil {
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log.Fatalf("failed to open cert.pem for writing: %s", err)
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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.OpenFile("key.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 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, pemBlockForKey(priv))
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keyOut.Close()
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log.Print("written key.pem\n")
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parsedResult, err := x509.ParseCertificate(derBytes)
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if err != nil {
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log.Fatal("failed to parse output cert: ", err)
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}
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dehydrated, err := certdehydrate.DehydrateCert(parsedResult)
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if err != nil {
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log.Fatal("failed to dehydrate result cert: ", err)
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}
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rehydrated, err := certdehydrate.RehydrateCert(dehydrated)
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if err != nil {
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log.Fatal("failed to rehydrate result cert: ", err)
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}
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rehydratedDerBytes, err := certdehydrate.FillRehydratedCertTemplate(*rehydrated, *host)
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if err != nil {
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log.Fatal("failed to fill rehydrated result cert: ", err)
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}
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if ! bytes.Equal(derBytes, rehydratedDerBytes) {
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log.Fatal("ERROR: The cert did not rehydrate to an identical form. This is a bug; do not use the generated certificate.")
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}
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log.Print("Your Namecoin cert is: {\"d8\":", dehydrated, "}")
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log.Print("SUCCESS: The cert rehydrated to an identical form. Place the generated files in your HTTPS server, and place the above JSON in the \"tls\" field for your Namecoin name.");
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if len(*falseHost) > 0 {
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var falsePriv interface{}
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switch *ecdsaCurve {
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case "P224":
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falsePriv, err = ecdsa.GenerateKey(elliptic.P224(), rand.Reader)
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case "P256":
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falsePriv, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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case "P384":
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falsePriv, err = ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
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case "P521":
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falsePriv, err = ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
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default:
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fmt.Fprintf(os.Stderr, "Unrecognized elliptic curve: %q", *ecdsaCurve)
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os.Exit(1)
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}
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if err != nil {
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log.Fatalf("failed to generate false private key: %s", err)
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}
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falseSerialNumber := big.NewInt(2)
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falseTemplate := x509.Certificate{
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SerialNumber: falseSerialNumber,
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Subject: pkix.Name{
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CommonName: *falseHost,
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SerialNumber: "Namecoin TLS Certificate",
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},
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NotBefore: notBefore,
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NotAfter: notAfter,
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// x509.KeyUsageKeyEncipherment is used for RSA key exchange, but not DHE/ECDHE key exchange. Since everyone should be using ECDHE (due to forward secrecy), we disallow x509.KeyUsageKeyEncipherment in our template.
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//KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
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KeyUsage: x509.KeyUsageDigitalSignature,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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BasicConstraintsValid: true,
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}
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falseTemplate.DNSNames = append(falseTemplate.DNSNames, *falseHost)
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falseDerBytes, err := x509.CreateCertificate(rand.Reader, &falseTemplate, &template, publicKey(falsePriv), priv)
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if err != nil {
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log.Fatalf("Failed to create false certificate: %s", err)
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}
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falseCertOut, err := os.Create("falseCert.pem")
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if err != nil {
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log.Fatalf("failed to open falseCert.pem for writing: %s", err)
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}
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pem.Encode(falseCertOut, &pem.Block{Type: "CERTIFICATE", Bytes: falseDerBytes})
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falseCertOut.Close()
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log.Print("written falseCert.pem\n")
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falseKeyOut, err := os.OpenFile("falseKey.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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log.Print("failed to open falseKey.pem for writing:", err)
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return
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}
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pem.Encode(falseKeyOut, pemBlockForKey(falsePriv))
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falseKeyOut.Close()
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log.Print("written falseKey.pem\n")
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}
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}
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