invalid privatekey: [B@39b54f70

def remote = [:]
remote.name = "example-host-name"
remote.host = remote.name
remote.allowAnyHosts = true

withCredentials([sshUserPrivateKey(credentialsId: 'example-key',
            keyFileVariable: 'identity',
            passphraseVariable: 'identityPass',
            usernameVariable: 'userName')]) {
    remote.user = userName
    remote.identityFile = identity
    remote.passphrase = identityPass
    sshCommand(remote: remote, command: "ls -l")
}