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decryptSymmetric.js
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decryptSymmetric.js
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// Copyright 2020 Google LLC
//
// 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
//
// https://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';
async function main(
projectId = 'my-project',
locationId = 'us-east1',
keyRingId = 'my-key-ring',
keyId = 'my-key',
ciphertext = Buffer.from('...')
) {
// [START kms_decrypt_symmetric]
//
// TODO(developer): Uncomment these variables before running the sample.
//
// const projectId = 'my-project';
// const locationId = 'us-east1';
// const keyRingId = 'my-key-ring';
// const keyId = 'my-key';
// Ciphertext must be either a Buffer object or a base-64 encoded string
// const ciphertext = Buffer.from('...');
// Imports the Cloud KMS library
const {KeyManagementServiceClient} = require('@google-cloud/kms');
// Instantiates a client
const client = new KeyManagementServiceClient();
// Build the key name
const keyName = client.cryptoKeyPath(projectId, locationId, keyRingId, keyId);
// Optional, but recommended: compute ciphertext's CRC32C.
const crc32c = require('fast-crc32c');
const ciphertextCrc32c = crc32c.calculate(ciphertext);
async function decryptSymmetric() {
const [decryptResponse] = await client.decrypt({
name: keyName,
ciphertext: ciphertext,
ciphertextCrc32c: {
value: ciphertextCrc32c,
},
});
// Optional, but recommended: perform integrity verification on decryptResponse.
// For more details on ensuring E2E in-transit integrity to and from Cloud KMS visit:
// https://cloud.google.com/kms/docs/data-integrity-guidelines
if (
crc32c.calculate(decryptResponse.plaintext) !==
Number(decryptResponse.plaintextCrc32c.value)
) {
throw new Error('Decrypt: response corrupted in-transit');
}
const plaintext = decryptResponse.plaintext.toString();
console.log(`Plaintext: ${plaintext}`);
return plaintext;
}
return decryptSymmetric();
// [END kms_decrypt_symmetric]
}
module.exports.main = main;
/* c8 ignore next 10 */
if (require.main === module) {
main(...process.argv.slice(2)).catch(err => {
console.error(err.message);
process.exitCode = 1;
});
process.on('unhandledRejection', err => {
console.error(err.message);
process.exitCode = 1;
});
}