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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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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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"fmt" |
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"log" |
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"os" |
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"time" |
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) |
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func main() { |
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if len(os.Args) != 2 { |
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fmt.Printf("Usage: %s <hostname of server>\n", os.Args[0]) |
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return |
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} |
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hostName := os.Args[1] |
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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.Crashf("failed to open /dev/urandom: %s\n", err) |
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return |
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} |
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log.Stdoutf("Generating RSA key\n") |
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priv, err := rsa.GenerateKey(urandom, 1024) |
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if err != nil { |
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log.Crashf("failed to generate private key: %s\n", 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: "Acme Co", |
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}, |
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NotBefore: time.SecondsToUTC(now - 300), |
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NotAfter: time.SecondsToUTC(now + 86400*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.Crashf("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.Crashf("failed to open cert.pem for writing: %s\n", 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.Stdoutf("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.Crashf("failed to open key.pem for writing: %s\n", 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.Stdoutf("written key.pem\n") |
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} |