69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
package main
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha1"
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"crypto/tls"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/base32"
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"encoding/pem"
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"math/big"
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"os"
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"path"
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"time"
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)
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const (
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tlsRSABits = 2048
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tlsName = "syncthing"
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)
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func loadCert(dir string) (tls.Certificate, error) {
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return tls.LoadX509KeyPair(path.Join(dir, "cert.pem"), path.Join(dir, "key.pem"))
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}
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func certId(bs []byte) string {
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hf := sha1.New()
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hf.Write(bs)
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id := hf.Sum(nil)
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return base32.StdEncoding.EncodeToString(id)
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}
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func newCertificate(dir string) {
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priv, err := rsa.GenerateKey(rand.Reader, tlsRSABits)
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fatalErr(err)
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notBefore := time.Now()
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notAfter := time.Date(2049, 12, 31, 23, 59, 59, 0, time.UTC)
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template := x509.Certificate{
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SerialNumber: new(big.Int).SetInt64(0),
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Subject: pkix.Name{
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CommonName: tlsName,
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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, &priv.PublicKey, priv)
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fatalErr(err)
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certOut, err := os.Create(path.Join(dir, "cert.pem"))
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fatalErr(err)
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pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
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certOut.Close()
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okln("wrote cert.pem")
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keyOut, err := os.OpenFile(path.Join(dir, "key.pem"), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
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fatalErr(err)
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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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okln("wrote key.pem")
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}
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