DockerCLI/vendor/github.com/theupdateframework/notary/cryptoservice/certificate.go

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package cryptoservice
import (
"crypto"
"crypto/rand"
"crypto/x509"
"fmt"
"time"
"github.com/theupdateframework/notary/tuf/data"
"github.com/theupdateframework/notary/tuf/utils"
)
// GenerateCertificate generates an X509 Certificate from a template, given a GUN and validity interval
func GenerateCertificate(rootKey data.PrivateKey, gun data.GUN, startTime, endTime time.Time) (*x509.Certificate, error) {
signer := rootKey.CryptoSigner()
if signer == nil {
return nil, fmt.Errorf("key type not supported for Certificate generation: %s", rootKey.Algorithm())
}
return generateCertificate(signer, gun, startTime, endTime)
}
func generateCertificate(signer crypto.Signer, gun data.GUN, startTime, endTime time.Time) (*x509.Certificate, error) {
template, err := utils.NewCertificate(gun.String(), startTime, endTime)
if err != nil {
return nil, fmt.Errorf("failed to create the certificate template for: %s (%v)", gun, err)
}
derBytes, err := x509.CreateCertificate(rand.Reader, template, template, signer.Public(), signer)
if err != nil {
return nil, fmt.Errorf("failed to create the certificate for: %s (%v)", gun, err)
}
cert, err := x509.ParseCertificate(derBytes)
if err != nil {
return nil, fmt.Errorf("failed to parse the certificate for key: %s (%v)", gun, err)
}
return cert, nil
}