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/*
* ============LICENSE_START=======================================================
* oom-certservice-k8s-external-provider
* ================================================================================
* Copyright (C) 2020 Nokia. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package x509
import (
"bytes"
"crypto/x509"
"encoding/pem"
"fmt"
)
const (
PemCsrType = "CERTIFICATE REQUEST"
pemPrivateKeyType = "PRIVATE KEY"
)
// decodeCSR decodes a certificate request in PEM format
func DecodeCSR(data []byte) (*x509.CertificateRequest, error) {
block, err := decodePemBlock(data, PemCsrType)
if err != nil {
return nil, fmt.Errorf("error decoding CSR PEM: %v", err)
}
csr, err := x509.ParseCertificateRequest(block.Bytes)
if err != nil {
return nil, fmt.Errorf("error parsing certificate request: %v", err)
}
if err := csr.CheckSignature(); err != nil {
return nil, fmt.Errorf("error checking certificate request signature: %v", err)
}
return csr, nil
}
func DecodePrivateKey(data []byte) (interface{}, error) {
block, err := decodePemBlock(data, pemPrivateKeyType)
if err != nil {
return nil, fmt.Errorf("error decoding Private Key PEM: %v", err)
}
key, err := x509.ParsePKCS8PrivateKey(block.Bytes)
if err != nil {
return nil, fmt.Errorf("error parsing Private Key: %v", err)
}
return key, nil
}
func decodePemBlock(data []byte, pemType string) (*pem.Block, error) {
block, rest := pem.Decode(data)
if block == nil || len(rest) > 0 {
return nil, fmt.Errorf("unexpected PEM")
}
if block.Type != pemType {
return nil, fmt.Errorf("PEM is not: %s", pemType)
}
return block, nil
}
func ParseCertificateArrayToBytes(certificateArray []string) ([]byte, error) {
buffer := bytes.NewBuffer([]byte{})
for _, cert := range certificateArray {
block, _ := pem.Decode([]byte(cert))
err := pem.Encode(buffer, &pem.Block{Type: "CERTIFICATE", Bytes: block.Bytes})
if err != nil {
return nil, err
}
}
return buffer.Bytes(), nil
}
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