Add ECDSA support

pkg/apiserver/authenticator/authn.go

@@ -17,7 +17,6 @@ limitations under the License.
 package authenticator
 
 import (
-	"crypto/rsa"
 	"time"
 
 	"k8s.io/kubernetes/pkg/auth/authenticator"
@@ -183,7 +182,7 @@ func newServiceAccountAuthenticator(keyfile string, lookup bool, serviceAccountG
 		return nil, err
 	}
 
-	tokenAuthenticator := serviceaccount.JWTTokenAuthenticator([]*rsa.PublicKey{publicKey}, lookup, serviceAccountGetter)
+	tokenAuthenticator := serviceaccount.JWTTokenAuthenticator([]interface{}{publicKey}, lookup, serviceAccountGetter)
 	return bearertoken.New(tokenAuthenticator), nil
 }