surrealpatch/util/cert/cert.go
2016-07-04 09:08:18 +01:00

96 lines
1.8 KiB
Go

// Copyright © 2016 Abcum Ltd
//
// Licensed 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 cert
import (
"fmt"
"os"
"encoding/pem"
)
func Extract(enc, key, crt string) (err error) {
var file *os.File
data := []byte(enc)
pemk, pemc := extract(data)
if pemk == nil || pemc == nil {
return fmt.Errorf("Can not decode PEM encoded file")
}
file, err = os.Create(key)
if err != nil {
return fmt.Errorf("Can not decode PEM encoded private key into %s", key)
}
file.Write(pemk)
file.Close()
file, err = os.Create(crt)
if err != nil {
return fmt.Errorf("Can not decode PEM encoded certificate into %s", crt)
}
file.Write(pemc)
file.Close()
return
}
func extract(data []byte) (key []byte, crt []byte) {
key = extractKey(data)
crt = extractCrt(data)
return
}
func extractKey(data []byte) (output []byte) {
var block *pem.Block
for len(data) > 0 {
block, data = pem.Decode(data)
if block == nil {
break
}
if block.Type == "RSA PRIVATE KEY" {
output = append(output, pem.EncodeToMemory(block)...)
}
}
return
}
func extractCrt(data []byte) (output []byte) {
var block *pem.Block
for len(data) > 0 {
block, data = pem.Decode(data)
if block == nil {
break
}
if block.Type == "CERTIFICATE" {
output = append(output, pem.EncodeToMemory(block)...)
}
}
return
}