/
keypair.go
80 lines (73 loc) · 2.16 KB
/
keypair.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package tls
import (
"bytes"
"crypto"
"crypto/ecdsa"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
)
import (
"github.com/pkg/errors"
)
type KeyPair struct {
CertPEM []byte
KeyPEM []byte
}
func ToKeyPair(key crypto.PrivateKey, cert []byte) (*KeyPair, error) {
keyPem, err := pemEncodeKey(key)
if err != nil {
return nil, errors.Wrap(err, "failed to PEM encode a private key")
}
certPem, err := pemEncodeCert(cert)
if err != nil {
return nil, errors.Wrap(err, "failed to PEM encode a certificate")
}
return &KeyPair{
CertPEM: certPem,
KeyPEM: keyPem,
}, nil
}
func pemEncodeKey(priv crypto.PrivateKey) ([]byte, error) {
var block *pem.Block
switch k := priv.(type) {
case *ecdsa.PrivateKey:
bytes, err := x509.MarshalECPrivateKey(k)
if err != nil {
return nil, err
}
block = &pem.Block{Type: "EC PRIVATE KEY", Bytes: bytes}
case *rsa.PrivateKey:
block = &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(k)}
default:
return nil, errors.Errorf("unsupported private key type %T", priv)
}
var keyBuf bytes.Buffer
if err := pem.Encode(&keyBuf, block); err != nil {
return nil, err
}
return keyBuf.Bytes(), nil
}
func pemEncodeCert(derBytes []byte) ([]byte, error) {
var certBuf bytes.Buffer
if err := pem.Encode(&certBuf, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes}); err != nil {
return nil, err
}
return certBuf.Bytes(), nil
}