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pkcs12.go
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pkcs12.go
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/*
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 template
import (
"bytes"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"fmt"
"golang.org/x/crypto/pkcs12"
gopkcs12 "software.sslmate.com/src/go-pkcs12"
)
func pkcs12keyPass(pass, input string) (string, error) {
blocks, err := pkcs12.ToPEM([]byte(input), pass)
if err != nil {
return "", fmt.Errorf(errDecodePKCS12WithPass, err)
}
var pemData []byte
for _, block := range blocks {
// remove bag attributes like localKeyID, friendlyName
block.Headers = nil
if block.Type == pemTypeCertificate {
continue
}
key, err := parsePrivateKey(block.Bytes)
if err != nil {
return "", err
}
// we use pkcs8 because it supports more key types (ecdsa, ed25519), not just RSA
block.Bytes, err = x509.MarshalPKCS8PrivateKey(key)
if err != nil {
return "", err
}
// report error if encode fails
var buf bytes.Buffer
if err := pem.Encode(&buf, block); err != nil {
return "", err
}
pemData = append(pemData, buf.Bytes()...)
}
return string(pemData), nil
}
func parsePrivateKey(block []byte) (any, error) {
if k, err := x509.ParsePKCS1PrivateKey(block); err == nil {
return k, nil
}
if k, err := x509.ParsePKCS8PrivateKey(block); err == nil {
return k, nil
}
if k, err := x509.ParseECPrivateKey(block); err == nil {
return k, nil
}
return nil, fmt.Errorf(errParsePrivKey)
}
func pkcs12key(input string) (string, error) {
return pkcs12keyPass("", input)
}
func pkcs12certPass(pass, input string) (string, error) {
blocks, err := pkcs12.ToPEM([]byte(input), pass)
if err != nil {
return "", fmt.Errorf(errDecodeCertWithPass, err)
}
var pemData []byte
for _, block := range blocks {
if block.Type != pemTypeCertificate {
continue
}
// remove bag attributes like localKeyID, friendlyName
block.Headers = nil
// report error if encode fails
var buf bytes.Buffer
if err := pem.Encode(&buf, block); err != nil {
return "", err
}
pemData = append(pemData, buf.Bytes()...)
}
// try to order certificate chain. If it fails we return
// the unordered raw pem data.
// This fails if multiple leaf or disjunct certs are provided.
ordered, err := fetchCertChains(pemData)
if err != nil {
return string(pemData), nil
}
return string(ordered), nil
}
func pkcs12cert(input string) (string, error) {
return pkcs12certPass("", input)
}
func pemToPkcs12(cert, key string) (string, error) {
return pemToPkcs12Pass(cert, key, "")
}
func pemToPkcs12Pass(cert, key, pass string) (string, error) {
certPem, _ := pem.Decode([]byte(cert))
keyPem, _ := pem.Decode([]byte(key))
parsedCert, err := x509.ParseCertificate(certPem.Bytes)
if err != nil {
return "", err
}
parsedKey, err := parsePrivateKey(keyPem.Bytes)
if err != nil {
return "", err
}
pfx, err := gopkcs12.Modern.Encode(parsedKey, parsedCert, nil, pass)
if err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(pfx), nil
}