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builder.go
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/
builder.go
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// Copyright 2022 Dimitrij Drus <dadrus@gmx.de>
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0
package pemx
import (
"bytes"
"crypto/ecdsa"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
)
type (
BlockOption func(*pem.Block)
EntryOption func(*pem.Block) error
)
func WithHeader(key, value string) BlockOption {
return func(block *pem.Block) {
block.Headers[key] = value
}
}
func WithX509Certificate(cert *x509.Certificate, opts ...BlockOption) EntryOption {
return func(block *pem.Block) error {
block.Type = "CERTIFICATE"
block.Bytes = cert.Raw
for _, opt := range opts {
opt(block)
}
return nil
}
}
func WithECDSAPublicKey(key *ecdsa.PublicKey, opts ...BlockOption) EntryOption {
return func(block *pem.Block) error {
raw, err := x509.MarshalPKIXPublicKey(key)
if err != nil {
return err
}
block.Type = "ECDSA PUBLIC KEY"
block.Bytes = raw
for _, opt := range opts {
opt(block)
}
return nil
}
}
func WithECDSAPrivateKey(key *ecdsa.PrivateKey, opts ...BlockOption) EntryOption {
return func(block *pem.Block) error {
raw, err := x509.MarshalECPrivateKey(key)
if err != nil {
return err
}
block.Type = "EC PRIVATE KEY"
block.Bytes = raw
for _, opt := range opts {
opt(block)
}
return nil
}
}
func WithRSAPrivateKey(key *rsa.PrivateKey, opts ...BlockOption) EntryOption {
return func(block *pem.Block) error {
block.Type = "RSA PRIVATE KEY"
block.Bytes = x509.MarshalPKCS1PrivateKey(key)
for _, opt := range opts {
opt(block)
}
return nil
}
}
func BuildPEM(opts ...EntryOption) ([]byte, error) {
buf := new(bytes.Buffer)
for _, opt := range opts {
block := &pem.Block{Headers: make(map[string]string)}
err := opt(block)
if err != nil {
return nil, err
}
if err = pem.Encode(buf, block); err != nil {
return nil, err
}
}
return buf.Bytes(), nil
}