key_helper.go

/*
Copyright © 2024 Keyfactor

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 ejbca

import (
	"crypto/x509"
	"encoding/base64"
	"encoding/pem"
	"fmt"
	"strings"

	"github.com/hashicorp/vault/sdk/helper/certutil"
)

type privateKeyHelper struct {
	keyBundle *certutil.KeyBundle
	warnings  []string
	isInit    bool
}

func (i *privateKeyHelper) Init(csrBundle *certutil.ParsedCSRBundle) *privateKeyHelper {
	i.keyBundle = &certutil.KeyBundle{}
	i.keyBundle.SetParsedPrivateKey(csrBundle.PrivateKey, csrBundle.PrivateKeyType, csrBundle.PrivateKeyBytes)

	i.isInit = true
	return i
}

func (i *privateKeyHelper) GetPrivateKeyType() certutil.PrivateKeyType {
	if !i.isInit {
		return ""
	}
	return i.keyBundle.PrivateKeyType
}

func (i *privateKeyHelper) GetPrivateKeyPemString() string {
	if !i.isInit {
		return ""
	}

	pemString, err := i.keyBundle.ToPrivateKeyPemString()
	if err != nil {
		i.warnings = append(i.warnings, fmt.Sprintf("Error converting private key to PEM string: %s", err.Error()))
		return ""
	}
	return pemString
}

func (i *privateKeyHelper) GetPrivateKeyDerString() string {
	if !i.isInit {
		return ""
	}

	return base64.StdEncoding.EncodeToString(i.keyBundle.PrivateKeyBytes)
}

func (i *privateKeyHelper) GetPKCS8PrivateKey(isPem bool) string {
	if !i.isInit {
		return ""
	}

	key, err := x509.MarshalPKCS8PrivateKey(i.keyBundle.PrivateKey)
	if err != nil {
		i.warnings = append(i.warnings, fmt.Sprintf("Error converting private key to PKCS8: %s", err.Error()))
		return ""
	}

	if isPem {
		return strings.TrimSpace(string(pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: key})))
	}

	return base64.StdEncoding.EncodeToString(key)
}