lego/acme/crypto.go

package acme

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"crypto/x509/pkix"
	"encoding/pem"
)

func generatePrivateKey(keyLength int) (*rsa.PrivateKey, error) {
	return rsa.GenerateKey(rand.Reader, keyLength)
}

func generateCsr(privateKey *rsa.PrivateKey, domain string) ([]byte, error) {
	template := x509.CertificateRequest{
		Subject: pkix.Name{
			CommonName: domain,
		},
	}

	return x509.CreateCertificateRequest(rand.Reader, &template, privateKey)
}

func pemEncode(data interface{}) []byte {
	var pemBlock *pem.Block
	switch key := data.(type) {
	case *rsa.PrivateKey:
		pemBlock = &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(key)}
	}

	return pem.EncodeToMemory(pemBlock)
}