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crypto.go
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crypto.go
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package util
import (
"bytes"
"crypto/x509"
"encoding/pem"
"fmt"
"io/ioutil"
"k8s.io/client-go/util/cert"
)
func CertPoolFromFile(filename string) (*x509.CertPool, error) {
pool := x509.NewCertPool()
if len(filename) == 0 {
return pool, nil
}
pemBlock, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
certs, err := cert.ParseCertsPEM(pemBlock)
if err != nil {
return nil, fmt.Errorf("Error reading %s: %s", filename, err)
}
for _, cert := range certs {
pool.AddCert(cert)
}
return pool, nil
}
func CertificatesFromFile(file string) ([]*x509.Certificate, error) {
if len(file) == 0 {
return nil, nil
}
pemBlock, err := ioutil.ReadFile(file)
if err != nil {
return nil, err
}
certs, err := cert.ParseCertsPEM(pemBlock)
if err != nil {
return nil, fmt.Errorf("Error reading %s: %s", file, err)
}
return certs, nil
}
// PrivateKeysFromPEM extracts all blocks recognized as private keys into an output PEM encoded byte array,
// or returns an error. If there are no private keys it will return an empty byte buffer.
func PrivateKeysFromPEM(pemCerts []byte) ([]byte, error) {
buf := &bytes.Buffer{}
for len(pemCerts) > 0 {
var block *pem.Block
block, pemCerts = pem.Decode(pemCerts)
if block == nil {
break
}
if len(block.Headers) != 0 {
continue
}
switch block.Type {
// defined in OpenSSL pem.h
case "RSA PRIVATE KEY", "PRIVATE KEY", "ANY PRIVATE KEY", "DSA PRIVATE KEY", "ENCRYPTED PRIVATE KEY", "EC PRIVATE KEY":
if err := pem.Encode(buf, block); err != nil {
return nil, err
}
}
}
return buf.Bytes(), nil
}