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package acme
import (
"crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"errors"
"io"
"io/ioutil"
"log"
"os"
)
const (
pemRSA = `RSA PRIVATE KEY`
pemEC = `EC PRIVATE KEY`
pemCRT = `CERTIFICATE`
pemCSR = `CERTIFICATE REQUEST`
)
var (
ErrKeyType = errors.New("unknown key type")
ErrKeySize = errors.New("insufficient key size")
)
func SaveCSR(w io.Writer, csr []byte) error {
block := &pem.Block{Type: pemCSR, Bytes: csr}
return pem.Encode(w, block)
}
func SaveKey(w io.Writer, key crypto.PrivateKey) error {
var block *pem.Block
switch k := key.(type) {
case *rsa.PrivateKey:
der := x509.MarshalPKCS1PrivateKey(k)
block = &pem.Block{Type: pemRSA, Bytes: der}
case *ecdsa.PrivateKey:
der, err := x509.MarshalECPrivateKey(k)
if err != nil {
return err
}
block = &pem.Block{Type: pemEC, Bytes: der}
}
return pem.Encode(w, block)
}
func LoadKeyFile(fname string) (crypto.PrivateKey, error) {
fd, err := os.Open(fname)
if err != nil {
return nil, err
}
defer fd.Close()
return LoadKey(fd)
}
func LoadKey(r io.Reader) (crypto.PrivateKey, error) {
der, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
block, _ := pem.Decode(der)
switch block.Type {
case pemRSA:
return x509.ParsePKCS1PrivateKey(block.Bytes)
case pemEC:
return x509.ParseECPrivateKey(block.Bytes)
default:
log.Println("LoadKey")
return nil, ErrKeyType
}
}
func SaveCert(w io.Writer, cert []byte) error {
block := &pem.Block{Type: pemCRT, Bytes: cert}
return pem.Encode(w, block)
}
func LoadCertFile(fname string) ([]*x509.Certificate, error) {
fd, err := os.Open(fname)
if err != nil {
return nil, err
}
defer fd.Close()
return LoadCerts(fd)
}
func LoadCerts(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)
}
// NewKey generates a new private key, supported keysizes are:
// EC keys: 224, 256, 384, 521
// RSA keys: 1024, 1536, 2048, 4096, 8192
// Default key: 2048 RSA (when size of 0 is provided)
func NewKey(size int) (crypto.PrivateKey, error) {
switch size {
case 224:
return ecdsa.GenerateKey(elliptic.P224(), rand.Reader)
case 256:
return ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
case 384:
return ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
case 521:
return ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
case 1024, 1536, 2048, 4096, 8192:
return rsa.GenerateKey(rand.Reader, size)
case 0:
return rsa.GenerateKey(rand.Reader, 2048)
default:
log.Println("NewKey")
return nil, ErrKeySize
}
}
func NewCSR(key crypto.PrivateKey, altnames []string) (string, error) {
tmpl := x509.CertificateRequest{DNSNames: altnames}
der, err := x509.CreateCertificateRequest(rand.Reader, &tmpl, key)
if err != nil {
return "", err
}
return base64.RawURLEncoding.EncodeToString(der), nil
}
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