61 lines
1.4 KiB
Go
61 lines
1.4 KiB
Go
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package missinggo
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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/tls"
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"crypto/x509"
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"crypto/x509/pkix"
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"log"
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"math/big"
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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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// Creates a self-signed certificate in memory for use with tls.Config.
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func NewSelfSignedCertificate() (cert tls.Certificate, err error) {
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cert.PrivateKey, err = rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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return
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}
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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: %s", 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{"Acme Co"},
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},
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NotBefore: notBefore,
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NotAfter: notAfter,
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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(cert.PrivateKey), cert.PrivateKey)
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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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cert.Certificate = [][]byte{derBytes}
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return
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}
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