func (k *ecdsaPrivateKey) SKI() (ski []byte) {
	return k.ski
}
SKI returns the subject key identifier of this key.
package pkcs11
import (
	"crypto/ecdsa"
	"crypto/x509"
	"errors"
	"fmt"
	"github.com/inklabsfoundation/inkchain/bccsp"
)
type ecdsaPrivateKey struct {
	ski []byte
	pub ecdsaPublicKey
}
func (k *ecdsaPrivateKey) Bytes() (raw []byte, err error) {
	return nil, errors.New("Not supported.")
}