91 lines
2.3 KiB
Go
91 lines
2.3 KiB
Go
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package crypto
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"math/big"
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"net"
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"os"
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"time"
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log "github.com/sirupsen/logrus"
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)
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func GenerateKeypair(hosts []string) {
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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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keyUsage := x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment
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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{"BeryJu.org"},
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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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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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derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, 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("cert.pem")
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if err != nil {
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log.Fatalf("Failed to open cert.pem for writing: %v", 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 cert.pem: %v", err)
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}
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if err := certOut.Close(); err != nil {
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log.Fatalf("Error closing cert.pem: %v", err)
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}
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log.Print("wrote 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.Fatalf("Failed to open key.pem for writing: %v", err)
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return
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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 key.pem: %v", err)
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}
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if err := keyOut.Close(); err != nil {
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log.Fatalf("Error closing key.pem: %v", err)
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}
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log.Print("wrote key.pem\n")
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return
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}
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