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package acme
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/base64"
"encoding/pem"
"io"
"io/ioutil"
"os"
"path"
)
func LoadKeyFile(fname string) (*rsa.PrivateKey, error) {
fd, err := os.Open(fname)
if err != nil {
return nil, err
}
defer fd.Close()
return LoadKey(fd)
}
func LoadKey(r io.Reader) (*rsa.PrivateKey, error) {
der, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
block, _ := pem.Decode(der)
return x509.ParsePKCS1PrivateKey(block.Bytes)
}
func NewKey(w io.Writer, size int) (*rsa.PrivateKey, error) {
key, err := rsa.GenerateKey(rand.Reader, size)
if err != nil {
return nil, err
}
return key, SaveKey(w, key)
}
func SaveKey(w io.Writer, key *rsa.PrivateKey) error {
block := &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(key),
}
return pem.Encode(w, block)
}
func NewCSR(altnames []string, key *rsa.PrivateKey) (string, error) {
tmpl := x509.CertificateRequest{
Subject: pkix.Name{
CommonName: altnames[0],
},
}
if len(altnames) > 1 {
tmpl.DNSNames = altnames
}
der, err := x509.CreateCertificateRequest(rand.Reader, &tmpl, key)
if err != nil {
return "", err
}
return base64.RawURLEncoding.EncodeToString(der), nil
}
func SaveCert(w io.Writer, crt []*x509.Certificate) error {
for _, c := range crt {
block := &pem.Block{
Type: "CERTIFICATE",
Bytes: c.Raw,
}
if err := pem.Encode(w, block); err != nil {
return err
}
}
return nil
}
func LoadCertFile(fname string) ([]*x509.Certificate, error) {
fd, err := os.Open(fname)
if err != nil {
return nil, err
}
defer fd.Close()
return LoadCert(fd)
}
func LoadCert(r io.Reader) ([]*x509.Certificate, error) {
der, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
block, _ := pem.Decode(der)
return x509.ParseCertificates(block.Bytes)
}
func CreateKeyFile(fname string) (io.WriteCloser, error) {
return createFile(fname, 0700)
}
func CreateCertFile(fname string) (io.WriteCloser, error) {
return createFile(fname, 0755)
}
func createFile(fname string, mode os.FileMode) (io.WriteCloser, error) {
if err := os.MkdirAll(path.Dir(fname), mode); err != nil {
return nil, err
}
flags := os.O_WRONLY | os.O_CREATE | os.O_TRUNC
return os.OpenFile(fname, flags, mode&0644)
}
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