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pem.go
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pem.go
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package certutil
import (
"bytes"
"crypto"
"crypto/ecdsa"
"crypto/ed25519"
"crypto/rsa"
"crypto/x509"
"encoding/asn1"
"encoding/pem"
"fmt"
"io"
"os"
"strings"
"github.com/pkg/errors"
)
// LoadFromPEM returns Certificate loaded from the file
func LoadFromPEM(certFile string) (*x509.Certificate, error) {
bytes, err := os.ReadFile(certFile)
if err != nil {
return nil, errors.WithStack(err)
}
cert, err := ParseFromPEM(bytes)
if err != nil {
return nil, err
}
return cert, nil
}
// ParseFromPEM returns Certificate parsed from PEM
func ParseFromPEM(bytes []byte) (*x509.Certificate, error) {
block, _ := pem.Decode(bytes)
if block == nil || block.Type != "CERTIFICATE" || len(block.Headers) != 0 {
cert, err := x509.ParseCertificate(bytes)
if err == nil {
return cert, nil
}
return nil, errors.Errorf("unable to parse PEM")
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return nil, errors.WithMessagef(err, "unable to parse certificate")
}
return cert, nil
}
// LoadChainFromPEM returns Certificates loaded from the file
func LoadChainFromPEM(certFile string) ([]*x509.Certificate, error) {
bytes, err := os.ReadFile(certFile)
if err != nil {
return nil, errors.WithStack(err)
}
certs, err := ParseChainFromPEM(bytes)
if err != nil {
return nil, err
}
return certs, nil
}
// ParseChainFromPEM returns Certificates parsed from PEM
func ParseChainFromPEM(certificateChainPem []byte) ([]*x509.Certificate, error) {
list := make([]*x509.Certificate, 0)
var block *pem.Block
// trim white space around PEM
rest := []byte(strings.TrimSpace(string(certificateChainPem)))
for len(rest) != 0 {
block, rest = pem.Decode(rest)
if block == nil {
cert, err := x509.ParseCertificate(certificateChainPem)
if err == nil {
list = append(list, cert)
return list, nil
}
return list, errors.Errorf("potentially malformed PEM")
}
if block.Type == "CERTIFICATE" {
x509Certificate, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return nil, errors.WithMessage(err, "failed to parse certificate")
}
list = append(list, x509Certificate)
}
rest = []byte(strings.TrimSpace(string(rest)))
}
return list, nil
}
// encodeToPEM converts certificate to PEM format, with optional comments
func encodeToPEM(out io.Writer, withComments bool, crt *x509.Certificate) error {
if withComments {
fmt.Fprintf(out, "# Issuer: %s", NameToString(&crt.Issuer))
fmt.Fprintf(out, "\n# Subject: %s", NameToString(&crt.Subject))
fmt.Fprint(out, "\n# Validity")
fmt.Fprintf(out, "\n# Not Before: %s", crt.NotBefore.UTC().Format(certTimeFormat))
fmt.Fprintf(out, "\n# Not After : %s", crt.NotAfter.UTC().Format(certTimeFormat))
fmt.Fprint(out, "\n")
}
err := pem.Encode(out, &pem.Block{Type: "CERTIFICATE", Bytes: crt.Raw})
if err != nil {
return errors.WithStack(err)
}
return nil
}
// EncodeToPEM converts certificates to PEM format, with optional comments
func EncodeToPEM(out io.Writer, withComments bool, certs ...*x509.Certificate) error {
for _, crt := range certs {
if crt != nil {
err := encodeToPEM(out, withComments, crt)
if err != nil {
return err
}
}
}
return nil
}
// EncodeToPEMString converts certificates to PEM format, with optional comments
func EncodeToPEMString(withComments bool, certs ...*x509.Certificate) (string, error) {
if len(certs) == 0 || certs[0] == nil {
return "", nil
}
b := bytes.NewBuffer([]byte{})
err := EncodeToPEM(b, withComments, certs...)
if err != nil {
return "", err
}
pem := b.String()
pem = strings.TrimSpace(pem)
pem = strings.Replace(pem, "\n\n", "\n", -1)
return pem, nil
}
// CreatePoolFromPEM returns CertPool from PEM encoded certs
func CreatePoolFromPEM(pemBytes []byte) (*x509.CertPool, error) {
certs, err := ParseChainFromPEM(pemBytes)
if err != nil {
return nil, err
}
pool := x509.NewCertPool()
for _, cert := range certs {
pool.AddCert(cert)
}
return pool, nil
}
// LoadPEMFiles loads and concantenates PEM files into one slice
func LoadPEMFiles(files ...string) ([]byte, error) {
var pem []byte
for _, f := range files {
if f == "" {
continue
}
b, err := os.ReadFile(f)
if err != nil {
return pem, errors.WithMessage(err, "failed to load PEM")
}
s := bytes.TrimSpace(b)
if len(s) == 0 {
continue
}
if len(pem) > 0 {
pem = append(pem, byte('\n'))
pem = append(pem, s...)
} else {
pem = s
}
}
return pem, nil
}
// JoinPEM returns concantenated PEM
func JoinPEM(p1, p2 []byte) []byte {
p1 = bytes.TrimSpace(p1)
if len(p2) > 0 {
if len(p1) > 0 {
p1 = append(p1, '\n')
}
p1 = append(p1, bytes.TrimSpace(p2)...)
}
return p1
}
// ParseRSAPublicKeyFromPEM parses PEM encoded RSA public key
func ParseRSAPublicKeyFromPEM(key []byte) (*rsa.PublicKey, error) {
var err error
// Parse PEM block
block, _ := pem.Decode(key)
if block == nil {
return nil, errors.New("key must be PEM encoded")
}
// Parse the key
parsedKey, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
if _, err = asn1.Unmarshal(block.Bytes, &parsedKey); err != nil {
return nil, errors.New("unable to parse RSA Public Key")
}
}
pkey, ok := parsedKey.(*rsa.PublicKey)
if !ok {
return nil, errors.New("not RSA Public Key")
}
return pkey, nil
}
// EncodePublicKeyToPEM returns PEM encoded public key
func EncodePublicKeyToPEM(pubKey crypto.PublicKey) ([]byte, error) {
asn1Bytes, err := x509.MarshalPKIXPublicKey(pubKey)
if err != nil {
return nil, errors.WithStack(err)
}
var pemkey = &pem.Block{
Type: "PUBLIC KEY",
Bytes: asn1Bytes,
}
b := bytes.NewBuffer([]byte{})
err = pem.Encode(b, pemkey)
if err != nil {
return nil, errors.WithStack(err)
}
return b.Bytes(), nil
}
// EncodePrivateKeyToPEM returns PEM encoded private key
func EncodePrivateKeyToPEM(priv crypto.PrivateKey) (key []byte, err error) {
switch priv := priv.(type) {
case *rsa.PrivateKey:
key = x509.MarshalPKCS1PrivateKey(priv)
block := pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: key,
}
key = pem.EncodeToMemory(&block)
case *ecdsa.PrivateKey:
key, err = x509.MarshalECPrivateKey(priv)
if err != nil {
return nil, errors.WithStack(err)
}
block := pem.Block{
Type: "EC PRIVATE KEY",
Bytes: key,
}
key = pem.EncodeToMemory(&block)
default:
return nil, errors.Errorf("unsupported key: %T", priv)
}
return
}
// ParsePrivateKeyPEM parses and returns a PEM-encoded private
// key. The private key may be either an unencrypted PKCS#8, PKCS#1,
// or elliptic private key.
func ParsePrivateKeyPEM(keyPEM []byte) (key crypto.Signer, err error) {
return ParsePrivateKeyPEMWithPassword(keyPEM, nil)
}
// ParsePrivateKeyPEMWithPassword parses and returns a PEM-encoded private
// key. The private key may be a potentially encrypted PKCS#8, PKCS#1,
// or elliptic private key.
func ParsePrivateKeyPEMWithPassword(keyPEM []byte, password []byte) (key crypto.Signer, err error) {
keyDER, err := GetKeyDERFromPEM(keyPEM, password)
if err != nil {
return nil, err
}
return ParsePrivateKeyDER(keyDER)
}
// GetKeyDERFromPEM parses a PEM-encoded private key and returns DER-format key bytes.
func GetKeyDERFromPEM(in []byte, password []byte) ([]byte, error) {
// Ignore any EC PARAMETERS blocks when looking for a key (openssl includes
// them by default).
var keyDER *pem.Block
for {
keyDER, in = pem.Decode(in)
if keyDER == nil || keyDER.Type != "EC PARAMETERS" {
break
}
}
if keyDER != nil {
if procType, ok := keyDER.Headers["Proc-Type"]; ok {
if strings.Contains(procType, "ENCRYPTED") {
if password != nil {
return x509.DecryptPEMBlock(keyDER, password)
}
return nil, errors.Errorf("encrypted private key")
}
}
return keyDER.Bytes, nil
}
return nil, errors.Errorf("unable to decode private key")
}
// ParsePrivateKeyDER parses a PKCS #1, PKCS #8, ECDSA, or Ed25519 DER-encoded
// private key. The key must not be in PEM format.
func ParsePrivateKeyDER(keyDER []byte) (key crypto.Signer, err error) {
generalKey, err := x509.ParsePKCS8PrivateKey(keyDER)
if err != nil {
generalKey, err = x509.ParsePKCS1PrivateKey(keyDER)
if err != nil {
generalKey, err = x509.ParseECPrivateKey(keyDER)
// TODO:
//generalKey, err = ParseEd25519PrivateKey(keyDER)
if err != nil {
// We don't include the actual error into
// the final error. The reason might be
// we don't want to leak any info about
// the private key.
return nil, errors.Errorf("unable to parse private key")
}
}
}
switch typ := generalKey.(type) {
case *rsa.PrivateKey:
return typ, nil
case *ecdsa.PrivateKey:
return typ, nil
case ed25519.PrivateKey:
return typ, nil
}
// should never reach here
return nil, errors.Errorf("unable to parse private key")
}