Sandbox::https://github.com/googleapis/google-auth-library-nodejs/blob/main/samples/signBlob.js

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// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

// http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

'use strict';

const {auth} = require('google-auth-library');

/**

* Use the iamcredentials API to sign a blob of data.

async function main() {

const signedData = await auth.sign('some data');

console.log(signedData);

}

main().catch(e => {

console.error(e);

throw e;

});