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|
package sigstore
import (
"errors"
"fmt"
"os"
internalSigner "github.com/containers/image/v5/internal/signer"
"github.com/containers/image/v5/signature/signer"
"github.com/containers/image/v5/signature/sigstore/internal"
"github.com/sigstore/sigstore/pkg/cryptoutils"
)
type Option = internal.Option
func WithPrivateKeyFile(file string, passphrase []byte) Option {
return func(s *internal.SigstoreSigner) error {
if s.PrivateKey != nil {
return fmt.Errorf("multiple private key sources specified when preparing to create sigstore signatures")
}
if passphrase == nil {
return errors.New("private key passphrase not provided")
}
privateKeyPEM, err := os.ReadFile(file)
if err != nil {
return fmt.Errorf("reading private key from %s: %w", file, err)
}
signerVerifier, err := loadPrivateKey(privateKeyPEM, passphrase)
if err != nil {
return fmt.Errorf("initializing private key: %w", err)
}
publicKey, err := signerVerifier.PublicKey()
if err != nil {
return fmt.Errorf("getting public key from private key: %w", err)
}
publicKeyPEM, err := cryptoutils.MarshalPublicKeyToPEM(publicKey)
if err != nil {
return fmt.Errorf("converting public key to PEM: %w", err)
}
s.PrivateKey = signerVerifier
s.SigningKeyOrCert = publicKeyPEM
return nil
}
}
func NewSigner(opts ...Option) (*signer.Signer, error) {
s := internal.SigstoreSigner{}
for _, o := range opts {
if err := o(&s); err != nil {
return nil, err
}
}
if s.PrivateKey == nil {
return nil, errors.New("no private key source provided (neither a private key nor Fulcio) when preparing to create sigstore signatures")
}
return internalSigner.NewSigner(&s), nil
}
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