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path: root/crypto.go
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package acme

import (
	"crypto"
	"crypto/ecdsa"
	"crypto/rsa"
	"crypto/x509"
	"encoding/pem"
	"errors"
	"io"
	"io/ioutil"
	"os"
	"path"
)

const (
	pemRSA = `RSA PRIVATE KEY`
	pemEC  = `EC PRIVATE KEY`
	pemCRT = `CERTIFICATE`
)

var errKeyType = errors.New("unknown key type")

func LoadKeyFile(fname string) (crypto.PrivateKey, error) {
	fd, err := os.Open(fname)
	if err != nil {
		return nil, err
	}
	defer fd.Close()
	return LoadKey(fd)
}

func LoadKey(r io.Reader) (crypto.PrivateKey, error) {
	der, err := ioutil.ReadAll(r)
	if err != nil {
		return nil, err
	}
	block, _ := pem.Decode(der)
	switch block.Type {
	case pemRSA:
		return x509.ParsePKCS1PrivateKey(block.Bytes)
	case pemEC:
		return x509.ParseECPrivateKey(block.Bytes)
	default:
		return nil, errKeyType
	}
}

func saveKey(w io.Writer, key crypto.PrivateKey) error {
	var block *pem.Block
	switch k := key.(type) {
	case *rsa.PrivateKey:
		der := x509.MarshalPKCS1PrivateKey(k)
		block = &pem.Block{Type: pemRSA, Bytes: der}
	case *ecdsa.PrivateKey:
		der, err := x509.MarshalECPrivateKey(k)
		if err != nil {
			return err
		}
		block = &pem.Block{Type: pemEC, Bytes: der}
	}
	return pem.Encode(w, block)
}

func saveCert(w io.Writer, cert []byte) error {
	block := &pem.Block{
		Type:  pemCRT,
		Bytes: cert,
	}
	return pem.Encode(w, block)
}

func LoadCertFile(fname string) ([]*x509.Certificate, error) {
	fd, err := os.Open(fname)
	if err != nil {
		return nil, err
	}
	defer fd.Close()
	return LoadCerts(fd)
}

func LoadCerts(r io.Reader) ([]*x509.Certificate, error) {
	der, err := ioutil.ReadAll(r)
	if err != nil {
		return nil, err
	}
	block, _ := pem.Decode(der)
	return x509.ParseCertificates(block.Bytes)
}

func CreatePrivFile(fname string) (io.WriteCloser, error) {
	return createFile(fname, 0700)
}

func CreatePubFile(fname string) (io.WriteCloser, error) {
	return createFile(fname, 0755)
}

func createFile(fname string, mode os.FileMode) (io.WriteCloser, error) {
	if err := os.MkdirAll(path.Dir(fname), mode); err != nil {
		return nil, err
	}
	flags := os.O_WRONLY | os.O_CREATE | os.O_TRUNC
	return os.OpenFile(fname, flags, mode&0644)
}