92 lines
1.7 KiB
Go
92 lines
1.7 KiB
Go
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package main
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import (
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"crypto/ecdsa"
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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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"fmt"
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"math/big"
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"os"
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"time"
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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 generateCert(crtFile, keyFile string) error {
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priv, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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return err
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}
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template := x509.Certificate{
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SerialNumber: big.NewInt(1),
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Subject: pkix.Name{
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Organization: []string{"Acme Co"},
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},
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NotBefore: time.Now(),
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NotAfter: time.Now().Add(time.Hour * 24 * 180),
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KeyUsage: x509.KeyUsageKeyEncipherment | 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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derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(priv), priv)
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if err != nil {
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return err
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}
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f, err := os.Create(crtFile)
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if err != nil {
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return err
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}
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pem.Encode(f, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
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f.Close()
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f, err = os.Create(keyFile)
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if err != nil {
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return err
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}
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pem.Encode(f, pemBlockForKey(priv))
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f.Close()
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return nil
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}
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