kubernetes/staging/src/k8s.io/client-go/util/cert/io.go

// CanReadCertAndKey returns true if the certificate and key files already exists,
// otherwise returns false. If lost one of cert and key, returns error.
func CanReadCertAndKey(certPath, keyPath string) (bool, error) { … }

// If the file represented by path exists and
// readable, returns true otherwise returns false.
func canReadFile(path string) bool { … }

// WriteCert writes the pem-encoded certificate data to certPath.
// The certificate file will be created with file mode 0644.
// If the certificate file already exists, it will be overwritten.
// The parent directory of the certPath will be created as needed with file mode 0755.
func WriteCert(certPath string, data []byte) error { … }

// NewPool returns an x509.CertPool containing the certificates in the given PEM-encoded file.
// Returns an error if the file could not be read, a certificate could not be parsed, or if the file does not contain any certificates
func NewPool(filename string) (*x509.CertPool, error) { … }

// NewPoolFromBytes returns an x509.CertPool containing the certificates in the given PEM-encoded bytes.
// Returns an error if the file could not be read, a certificate could not be parsed, or if the file does not contain any certificates
func NewPoolFromBytes(pemBlock []byte) (*x509.CertPool, error) { … }

// CertsFromFile returns the x509.Certificates contained in the given PEM-encoded file.
// Returns an error if the file could not be read, a certificate could not be parsed, or if the file does not contain any certificates
func CertsFromFile(file string) ([]*x509.Certificate, error) { … }