Using customer-supplied encryption keys

This page describes how to use your own encryption key, referred to as a customer-supplied encryption key, with Cloud Storage. For details about this feature, including countries where it's available, see Customer-Supplied Encryption Keys. For other encryption options in Cloud Storage, see Data Encryption Options.

Generating your own encryption key

There are many ways to generate a Base64-encoded AES-256 encryption key. Here are several examples:

C++

For more information, see the Cloud Storage C++ API reference documentation . 

// Create a pseudo-random number generator (PRNG), this is included for
// demonstration purposes only. You should consult your security team about
// best practices to initialize PRNG. In particular, you should verify that
// the C++ library and operating system provide enough entropy to meet the
// security policies in your organization.

// Use the Mersenne-Twister Engine in this example:
//   https://en.cppreference.com/w/cpp/numeric/random/mersenne_twister_engine
// Any C++ PRNG can be used below, the choice is arbitrary.
using GeneratorType = std::mt19937_64;

// Create the default random device to fetch entropy.
std::random_device rd;

// Compute how much entropy we need to initialize the GeneratorType:
constexpr auto kRequiredEntropyWords =
    GeneratorType::state_size *
    (GeneratorType::word_size / std::numeric_limits<unsigned int>::digits);

// Capture the entropy bits into a vector.
std::vector<unsigned long> entropy(kRequiredEntropyWords);
std::generate(entropy.begin(), entropy.end(), [&rd] { return rd(); });

// Create the PRNG with the fetched entropy.
std::seed_seq seed(entropy.begin(), entropy.end());

// initialized with enough entropy such that the encryption keys are not
// predictable. Note that the default constructor for all the generators in
// the C++ standard library produce predictable keys.
std::mt19937_64 gen(seed);

namespace gcs = google::cloud::storage;
gcs::EncryptionKeyData data = gcs::CreateKeyFromGenerator(gen);

std::cout << "Base64 encoded key = " << data.key << "\n"
          << "Base64 encoded SHA256 of key = " << data.sha256 << "\n";

C#

For more information, see the Cloud Storage C# API reference documentation . 

void GenerateEncryptionKey()
{
    Console.Write(EncryptionKey.Generate().Base64Key);
}

Node.js

For more information, see the Cloud Storage Node.js API reference documentation . 

const crypto = require('crypto');

/**
 * Generates a 256 bit (32 byte) AES encryption key and prints the base64
 * representation.
 *
 * This is included for demonstration purposes. You should generate your own
 * key. Please remember that encryption keys should be handled with a
 * comprehensive security policy.
 *
 * @returns {string} The encryption key.
 */
function generateEncryptionKey() {
  const buffer = crypto.randomBytes(32);
  const encodedKey = buffer.toString('base64');

  console.log(`Base 64 encoded encryption key: ${encodedKey}`);

  return encodedKey;
}

PHP

For more information, see the Cloud Storage PHP API reference documentation . 


/**
 * Generate a base64 encoded encryption key for Google Cloud Storage.
 *
 * @return void
 */
function generate_encryption_key()
{
    $key = random_bytes(32);
    $encodedKey = base64_encode($key);
    printf('Your encryption key: %s' . PHP_EOL, $encodedKey);
}

Python

For more information, see the Cloud Storage Python API reference documentation . 

import base64
import os


def generate_encryption_key():
    """Generates a 256 bit (32 byte) AES encryption key and prints the
    base64 representation.

    This is included for demonstration purposes. You should generate your own
    key. Please remember that encryption keys should be handled with a
    comprehensive security policy.
    """
    key = os.urandom(32)
    encoded_key = base64.b64encode(key).decode("utf-8")

    print("Base 64 encoded encryption key: {}".format(encoded_key))

Ruby

For more information, see the Cloud Storage Ruby API reference documentation . 

require "base64"
require "openssl"

encryption_key  = OpenSSL::Cipher.new("aes-256-cfb").encrypt.random_key
encoded_enc_key = Base64.encode64 encryption_key

puts "Sample encryption key: #{encoded_enc_key}"

Uploading with your encryption key

To use customer-supplied encryption keys to upload an object:

gsutil

  1. Add the following option to the [GSUtil] section of your boto configuration file:

    encryption_key = [YOUR_ENCRYPTION_KEY]

    where [YOUR_ENCRYPTION_KEY] is the AES-256 encryption key used to encrypt your object.

  2. Use the gsutil cp command:

    gsutil cp [LOCAL_OBJECT_LOCATION] gs://[DESTINATION_BUCKET_NAME]/

    Where:

    • [LOCAL_OBJECT_LOCATION] is the path to the object you are uploading. For example, Desktop/dogs.png.
    • [DESTINATION_BUCKET_NAME] is the name of the bucket to which you are uploading the object. For example, my-bucket.

Code samples

C++

For more information, see the Cloud Storage C++ API reference documentation . 

namespace gcs = google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string bucket_name, std::string object_name,
   std::string base64_aes256_key) {
  StatusOr<gcs::ObjectMetadata> object_metadata = client.InsertObject(
      bucket_name, object_name, "top secret",
      gcs::EncryptionKey::FromBase64Key(base64_aes256_key));

  if (!object_metadata) {
    throw std::runtime_error(object_metadata.status().message());
  }

  std::cout << "The object " << object_metadata->name()
            << " was created in bucket " << object_metadata->bucket()
            << "\nFull metadata: " << *object_metadata << "\n";
}

C#

For more information, see the Cloud Storage C# API reference documentation . 

private void UploadEncryptedFile(string key, string bucketName,
    string localPath, string objectName = null)
{
    var storage = StorageClient.Create();
    using (var f = File.OpenRead(localPath))
    {
        objectName = objectName ?? Path.GetFileName(localPath);
        storage.UploadObject(bucketName, objectName, null, f,
            new UploadObjectOptions()
            {
                EncryptionKey = EncryptionKey.Create(
                Convert.FromBase64String(key))
            });
        Console.WriteLine($"Uploaded {objectName}.");
    }
}

Go

For more information, see the Cloud Storage Go API reference documentation . 

obj := client.Bucket(bucket).Object(object)
// Encrypt the object's contents.
wc := obj.Key(secretKey).NewWriter(ctx)
if _, err := wc.Write([]byte("top secret")); err != nil {
	return err
}
if err := wc.Close(); err != nil {
	return err
}

Java

For more information, see the Cloud Storage Java API reference documentation . 

byte[] data = "Hello, World!".getBytes(UTF_8);

BlobId blobId = BlobId.of(bucketName, blobName);
BlobInfo blobInfo = BlobInfo.newBuilder(blobId).setContentType("text/plain").build();
Blob blob = storage.create(blobInfo, data, BlobTargetOption.encryptionKey(encryptionKey));

Node.js

For more information, see the Cloud Storage Node.js API reference documentation . 

// Imports the Google Cloud client library
const {Storage} = require('@google-cloud/storage');

// Creates a client
const storage = new Storage();

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// const bucketName = 'Name of a bucket, e.g. my-bucket';
// const srcFilename = 'Local file to upload, e.g. ./local/path/to/file.txt';
// const destFilename = 'Remote destination for file, e.g. file_encrypted.txt';

// See the "Generating your own encryption key" section above.
// const key = 'A base64 encoded customer-supplied key';

const options = {
  // The path to which the file should be uploaded, e.g. "file_encrypted.txt"
  destination: destFilename,
  // Encrypt the file with a customer-supplied key.
  // See the "Generating your own encryption key" section above.
  encryptionKey: Buffer.from(key, 'base64'),
};

// Encrypts and uploads a local file, e.g. "./local/path/to/file.txt".
// The file will only be retrievable using the key used to upload it.
await storage.bucket(bucketName).upload(srcFilename, options);

console.log(
  `File ${srcFilename} uploaded to gs://${bucketName}/${destFilename}.`
);

PHP

For more information, see the Cloud Storage PHP API reference documentation . 

use Google\Cloud\Storage\StorageClient;

/**
 * Upload an encrypted file.
 *
 * @param string $bucketName the name of your Google Cloud bucket.
 * @param string $objectName the name of your Google Cloud object.
 * @param resource $source the path to the file to upload.
 * @param string $base64EncryptionKey the base64 encoded encryption key.
 *
 * @return void
 */
function upload_encrypted_object($bucketName, $objectName, $source, $base64EncryptionKey)
{
    $storage = new StorageClient();
    $file = fopen($source, 'r');
    $bucket = $storage->bucket($bucketName);
    $object = $bucket->upload($file, [
        'name' => $objectName,
        'encryptionKey' => $base64EncryptionKey,
    ]);
    printf('Uploaded encrypted %s to gs://%s/%s' . PHP_EOL,
        basename($source), $bucketName, $objectName);
}

Python

For more information, see the Cloud Storage Python API reference documentation . 

from google.cloud import storage
import base64


def upload_encrypted_blob(
    bucket_name,
    source_file_name,
    destination_blob_name,
    base64_encryption_key,
):
    """Uploads a file to a Google Cloud Storage bucket using a custom
    encryption key.

    The file will be encrypted by Google Cloud Storage and only
    retrievable using the provided encryption key.
    """

    storage_client = storage.Client()
    bucket = storage_client.bucket(bucket_name)

    # Encryption key must be an AES256 key represented as a bytestring with
    # 32 bytes. Since it's passed in as a base64 encoded string, it needs
    # to be decoded.
    encryption_key = base64.b64decode(base64_encryption_key)
    blob = bucket.blob(
        destination_blob_name, encryption_key=encryption_key
    )

    blob.upload_from_filename(source_file_name)

    print(
        "File {} uploaded to {}.".format(
            source_file_name, destination_blob_name
        )
    )

Ruby

For more information, see the Cloud Storage Ruby API reference documentation . 

# project_id        = "Your Google Cloud project ID"
# bucket_name       = "Your Google Cloud Storage bucket name"
# local_file_path   = "Path to local file to upload"
# storage_file_path = "Path to store the file in Google Cloud Storage"
# encryption_key    = "AES-256 encryption key"

require "google/cloud/storage"

storage = Google::Cloud::Storage.new project_id: project_id

bucket = storage.bucket bucket_name

file = bucket.create_file local_file_path, storage_file_path,
                          encryption_key: encryption_key

puts "Uploaded #{file.name} with encryption key"

REST APIs

JSON API

  1. Get an authorization access token from the OAuth 2.0 Playground. Configure the playground to use your own OAuth credentials.

  2. Use cURL to call the JSON API with a POST Object request:

    curl -X POST --data-binary @[OBJECT] \
  -H "Authorization: Bearer [OAUTH2_TOKEN]" \
  -H "Content-Type: [OBJECT_CONTENT_TYPE]" \
  -H "x-goog-encryption-algorithm: AES256" \
  -H "x-goog-encryption-key: [YOUR_ENCRYPTION_KEY]" \
  -H "x-goog-encryption-key-sha256: [HASH_OF_YOUR_KEY]" \
  "https://storage.googleapis.com/upload/storage/v1/b/[BUCKET_NAME]/o?uploadType=media&name=[OBJECT_NAME]"

    Where:

    • [OBJECT] is the path to the object you are uploading. For example, Desktop/dogs.png.
    • [OAUTH2_TOKEN] is the access token you generated in Step 1.
    • [OBJECT_CONTENT_TYPE] is the content type of the object. For example, image/png.
    • [YOUR_ENCRYPTION_KEY] is the AES-256 key used for encrypting the uploaded object.
    • [HASH_OF_YOUR_KEY] is the SHA-256 hash for your AES-256 key.
    • [BUCKET_NAME] is the name of the bucket to which you are uploading the object. For example, my-bucket.
    • [OBJECT_NAME] is the name of the object you are uploading. For example, pets/dogs.png.

See Encryption request headers for more information on encryption-specific headers.

XML API

  1. Get an authorization access token from the OAuth 2.0 Playground. Configure the playground to use your own OAuth credentials.

  2. Use cURL to call the XML API with a PUT OBJECT request:

    curl -X -i PUT --data-binary @[OBJECT] \
  -H "Authorization: Bearer [OAUTH2_TOKEN]" \
  -H "Content-Type: [OBJECT_CONTENT_TYPE]" \
  -H "x-goog-encryption-algorithm: AES256" \
  -H "x-goog-encryption-key: [YOUR_ENCRYPTION_KEY]" \
  -H "x-goog-encryption-key-sha256: [HASH_OF_YOUR_KEY]" \
  "https://storage.googleapis.com/[BUCKET_NAME]/[OBJECT_NAME]"

    Where:

    • [OBJECT] is the path to the object you are uploading. For example, Desktop/dogs.png.
    • [OAUTH2_TOKEN] is the access token you generated in Step 1.
    • [OBJECT_CONTENT_TYPE] is the content type of the object. For example, image/png.
    • [YOUR_ENCRYPTION_KEY] is the AES-256 key used for encrypting the uploaded object.
    • [HASH_OF_YOUR_KEY] is the SHA-256 hash for your AES-256 key.
    • [BUCKET_NAME] is the name of the bucket to which you are uploading the object. For example, my-bucket.
    • [OBJECT_NAME] is the name of the object you are uploading. For example, pets/dogs.png.

See Encryption request headers for more information on encryption-specific headers.

Downloading objects you've encrypted

To download an object stored in Cloud Storage that is encrypted with a customer-supplied encryption key:

gsutil

  1. Add the following option to the [GSUtil] section of your boto configuration file:

    decryption_key1 = [YOUR_ENCRYPTION_KEY]

    where [YOUR_ENCRYPTION_KEY] is the key used to encrypt the object when it was uploaded.

  2. Use the gsutil cp command:

    gsutil cp gs://[BUCKET_NAME]/[OBJECT_NAME] [OBJECT_DESTINATION]

    Where:

    • [BUCKET_NAME] is the name of the bucket containing the object you are downloading. For example, my-bucket.
    • [OBJECT_NAME] is the name of the object you are downloading. For example, pets/dog.png.
    • [OBJECT_DESTINATION] is the location where you want to save your object. For example, Desktop.

Code samples

C++

For more information, see the Cloud Storage C++ API reference documentation . 

namespace gcs = google::cloud::storage;
[](gcs::Client client, std::string bucket_name, std::string object_name,
   std::string base64_aes256_key) {
  gcs::ObjectReadStream stream =
      client.ReadObject(bucket_name, object_name,
                        gcs::EncryptionKey::FromBase64Key(base64_aes256_key));

  std::string data(std::istreambuf_iterator<char>{stream}, {});
  std::cout << "The object contents are: " << data << "\n";
}

C#

For more information, see the Cloud Storage C# API reference documentation . 

private void DownloadEncryptedObject(string key, string bucketName,
    string objectName, string localPath = null)
{
    var storage = StorageClient.Create();
    localPath = localPath ?? Path.GetFileName(objectName);
    using (var outputFile = File.OpenWrite(localPath))
    {
        storage.DownloadObject(bucketName, objectName, outputFile,
            new DownloadObjectOptions()
            {
                EncryptionKey = EncryptionKey.Create(
                    Convert.FromBase64String(key))
            });
    }
    Console.WriteLine($"downloaded {objectName} to {localPath}.");
}

Go

For more information, see the Cloud Storage Go API reference documentation . 

obj := client.Bucket(bucket).Object(object)
rc, err := obj.Key(secretKey).NewReader(ctx)
if err != nil {
	return nil, err
}
defer rc.Close()

data, err := ioutil.ReadAll(rc)
if err != nil {
	return nil, err
}

Java

For more information, see the Cloud Storage Java API reference documentation . 

byte[] content =
    storage.readAllBytes(bucketName, blobName, BlobSourceOption.decryptionKey(decryptionKey));

Node.js

For more information, see the Cloud Storage Node.js API reference documentation . 

// Imports the Google Cloud client library
const {Storage} = require('@google-cloud/storage');

// Creates a client
const storage = new Storage();

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// const bucketName = 'Name of a bucket, e.g. my-bucket';
// const srcFilename = 'File to download, e.g. file_encrypted.txt';
// const destFilename = 'Local destination for file, e.g. ./file.txt';

// See the "Generating your own encryption key" section above.
// const key = 'A base64 encoded customer-supplied key';

const options = {
  // The path to which the file should be downloaded, e.g. "./file.txt"
  destination: destFilename,
};

// Descrypts and downloads the file. This can only be done with the key used
// to encrypt and upload the file.
await storage
  .bucket(bucketName)
  .file(srcFilename)
  .setEncryptionKey(Buffer.from(key, 'base64'))
  .download(options);

console.log(`File ${srcFilename} downloaded to ${destFilename}.`);

PHP

For more information, see the Cloud Storage PHP API reference documentation . 

use Google\Cloud\Storage\StorageClient;

/**
 * Download an encrypted file
 *
 * @param string $bucketName the name of your Google Cloud bucket.
 * @param string $objectName the name of your Google Cloud object.
 * @param string $destination the local destination to save the encrypted file.
 * @param string $base64EncryptionKey the base64 encoded encryption key.
 *
 * @return void
 */
function download_encrypted_object($bucketName, $objectName, $destination, $base64EncryptionKey)
{
    $storage = new StorageClient();
    $bucket = $storage->bucket($bucketName);
    $object = $bucket->object($objectName);
    $object->downloadToFile($destination, [
        'encryptionKey' => $base64EncryptionKey,
    ]);
    printf('Encrypted object gs://%s/%s downloaded to %s' . PHP_EOL,
        $bucketName, $objectName, basename($destination));
}

Python

For more information, see the Cloud Storage Python API reference documentation . 

from google.cloud import storage
import base64


def download_encrypted_blob(
    bucket_name,
    source_blob_name,
    destination_file_name,
    base64_encryption_key,
):
    """Downloads a previously-encrypted blob from Google Cloud Storage.

    The encryption key provided must be the same key provided when uploading
    the blob.
    """
    # bucket_name = "your-bucket-name"
    # source_blob_name = "storage-object-name"
    # destination_file_name = "local/path/to/file"
    # base64_encryption_key = "base64-encoded-encryption-key"

    storage_client = storage.Client()

    bucket = storage_client.bucket(bucket_name)

    # Encryption key must be an AES256 key represented as a bytestring with
    # 32 bytes. Since it's passed in as a base64 encoded string, it needs
    # to be decoded.
    encryption_key = base64.b64decode(base64_encryption_key)
    blob = bucket.blob(source_blob_name, encryption_key=encryption_key)

    blob.download_to_filename(destination_file_name)

    print(
        "Blob {} downloaded to {}.".format(
            source_blob_name, destination_file_name
        )
    )

Ruby

For more information, see the Cloud Storage Ruby API reference documentation . 

# project_id     = "Your Google Cloud project ID"
# bucket_name    = "Your Google Cloud Storage bucket name"
# file_name      = "Name of file in Google Cloud Storage to download locally"
# local_path     = "Destination path for downloaded file"
# encryption_key = "AES-256 encryption key"

require "google/cloud/storage"

storage = Google::Cloud::Storage.new project_id: project_id

bucket = storage.bucket bucket_name

file = bucket.file storage_file_path, encryption_key: encryption_key
file.download local_file_path, encryption_key: encryption_key

puts "Downloaded encrypted #{file.name}"

REST APIs

JSON API

  1. Get an authorization access token from the OAuth 2.0 Playground. Configure the playground to use your own OAuth credentials.

  2. Use cURL to call the JSON API with a GET Object request:

    curl -X GET \
  -H "Authorization: Bearer [OAUTH2_TOKEN]" \
  -H "x-goog-encryption-algorithm: AES256" \
  -H "x-goog-encryption-key: [YOUR_ENCRYPTION_KEY]" \
  -H "x-goog-encryption-key-sha256: [HASH_OF_YOUR_KEY]" \
  -o "[SAVE_TO_LOCATION]" \
  "https://storage.googleapis.com/storage/v1/b/[BUCKET_NAME]/o/[OBJECT_NAME]?alt=media"

    Where:

    • [OAUTH2_TOKEN] is the access token you generated in Step 1.
    • [YOUR_ENCRYPTION_KEY] is the AES-256 key you used to encrypt the object.
    • [HASH_OF_YOUR_KEY] is the SHA-256 hash for your AES-256 key.
    • [SAVE_TO_LOCATION] is the location where you want to save your object. For example, Desktop/dog.png.
    • [BUCKET_NAME] is the name of the bucket from which you are downloading the object. For example, my-bucket.
    • [OBJECT_NAME] is the name of the object you are downloading. For example, pets/dogs.png.

See Encryption request headers for more information on encryption-specific headers.

XML API

  1. Get an authorization access token from the OAuth 2.0 Playground. Configure the playground to use your own OAuth credentials.

  2. Use cURL to call the XML API with a GET OBJECT request:

    curl -X GET \
  -H "Authorization: Bearer [OAUTH2_TOKEN]" \
  -H "x-goog-encryption-algorithm: AES256" \
  -H "x-goog-encryption-key: [YOUR_ENCRYPTION_KEY]" \
  -H "x-goog-encryption-key-sha256: [HASH_OF_YOUR_KEY]" \
  -o "[SAVE_TO_LOCATION]" \
  "https://storage.googleapis.com/[BUCKET_NAME]/[OBJECT_NAME]"

    Where:

    • [OAUTH2_TOKEN] is the access token you generated in Step 1.
    • [YOUR_ENCRYPTION_KEY] is the AES-256 key you used to encrypt the object.
    • [HASH_OF_YOUR_KEY] is the SHA-256 hash for your AES-256 key.
    • [SAVE_TO_LOCATION] is the location where you want to save your object. For example, Desktop/dog.png.
    • [BUCKET_NAME] is the name of the bucket from which you are downloading the object. For example, my-bucket.
    • [OBJECT_NAME] is the name of the object you are downloading. For example, pets/dogs.png.

See Encryption request headers for more information on encryption-specific headers.

Rotating your encryption keys

To rotate a customer-supplied encryption key:

gsutil

  1. Add the following options to the [GSUtil] section of your boto configuration file:

    encryption_key = [NEW_ENCRYPTION_KEY]
decryption_key1 = [OLD_ENCRYPTION_KEY]

    Where:

    • [NEW_ENCRYPTION_KEY] is the new encryption key for your object.
    • [OLD_ENCRYPTION_KEY] is the current encryption key for your object.

  2. Use the gsutil rewrite command with the -k flag:

    gsutil rewrite -k gs://[BUCKET_NAME]/[OBJECT_NAME]

    Where:

    • [BUCKET_NAME] is the name of the bucket containing the relevant object. For example, my-bucket.
    • [OBJECT_NAME] is the name of the relevant object. For example, pets/dog.png.

Code samples

C++

For more information, see the Cloud Storage C++ API reference documentation . 

namespace gcs = google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string bucket_name, std::string object_name,
   std::string old_key_base64, std::string new_key_base64) {
  StatusOr<gcs::ObjectMetadata> object_metadata =
      client.RewriteObjectBlocking(
          bucket_name, object_name, bucket_name, object_name,
          gcs::SourceEncryptionKey::FromBase64Key(old_key_base64),
          gcs::EncryptionKey::FromBase64Key(new_key_base64));

  if (!object_metadata) {
    throw std::runtime_error(object_metadata.status().message());
  }

  std::cout << "Rotated key on object " << object_metadata->name()
            << " in bucket " << object_metadata->bucket()
            << "\nFull Metadata: " << *object_metadata << "\n";
}

Go

For more information, see the Cloud Storage Go API reference documentation . 

client, err := storage.NewClient(ctx)
if err != nil {
	return err
}
obj := client.Bucket(bucket).Object(object)
// obj is encrypted with key, we are encrypting it with the newKey.
_, err = obj.Key(newKey).CopierFrom(obj.Key(key)).Run(ctx)
if err != nil {
	return err
}

Java

For more information, see the Cloud Storage Java API reference documentation . 

BlobId blobId = BlobId.of(bucketName, blobName);
CopyRequest request =
    CopyRequest.newBuilder()
        .setSource(blobId)
        .setSourceOptions(BlobSourceOption.decryptionKey(oldEncryptionKey))
        .setTarget(blobId, BlobTargetOption.encryptionKey(newEncryptionKey))
        .build();
Blob blob = storage.copy(request).getResult();

PHP

For more information, see the Cloud Storage PHP API reference documentation . 

use Google\Cloud\Storage\StorageClient;

/**
 * Change the encryption key used to store an existing object.
 *
 * @param string $bucketName the name of your Google Cloud bucket.
 * @param string $objectName the name of your Google Cloud object.
 * @param string $base64EncryptionKey the base64 encoded encryption key.
 * @param string $newBase64EncryptionKey the new base64 encoded encryption key.
 *
 * @return void
 */
function rotate_encryption_key(
    $bucketName,
    $objectName,
    $base64EncryptionKey,
    $newBase64EncryptionKey
) {
    $storage = new StorageClient();
    $object = $storage->bucket($bucketName)->object($objectName);

    $rewrittenObject = $object->rewrite($bucketName, [
        'encryptionKey' => $base64EncryptionKey,
        'destinationEncryptionKey' => $newBase64EncryptionKey,
    ]);

    printf('Rotated encryption key for object gs://%s/%s' . PHP_EOL,
        $bucketName, $objectName);
}

Python

For more information, see the Cloud Storage Python API reference documentation . 

from google.cloud import storage
import base64


def rotate_encryption_key(
    bucket_name, blob_name, base64_encryption_key, base64_new_encryption_key
):
    """Performs a key rotation by re-writing an encrypted blob with a new
    encryption key."""
    storage_client = storage.Client()
    bucket = storage_client.bucket(bucket_name)
    current_encryption_key = base64.b64decode(base64_encryption_key)
    new_encryption_key = base64.b64decode(base64_new_encryption_key)

    # Both source_blob and destination_blob refer to the same storage object,
    # but destination_blob has the new encryption key.
    source_blob = bucket.blob(
        blob_name, encryption_key=current_encryption_key
    )
    destination_blob = bucket.blob(
        blob_name, encryption_key=new_encryption_key
    )

    token = None

    while True:
        token, bytes_rewritten, total_bytes = destination_blob.rewrite(
            source_blob, token=token
        )
        if token is None:
            break

    print("Key rotation complete for Blob {}".format(blob_name))

Ruby

For more information, see the Cloud Storage Ruby API reference documentation . 

# project_id             = "Your Google Cloud project ID"
# bucket_name            = "Your Google Cloud Storage bucket name"
# file_name              = "Name of a file in the Cloud Storage bucket"
# current_encryption_key = "Encryption key currently being used"
# new_encryption_key     = "New encryption key to use"

require "google/cloud/storage"

storage = Google::Cloud::Storage.new project_id: project_id
bucket  = storage.bucket bucket_name
file    = bucket.file file_name, encryption_key: current_encryption_key

file.rotate encryption_key:     current_encryption_key,
            new_encryption_key: new_encryption_key

puts "The encryption key for #{file.name} in #{bucket.name} was rotated."

REST APIs

JSON API

  1. Get an authorization access token from the OAuth 2.0 Playground. Configure the playground to use your own OAuth credentials.

  2. Use cURL to call the JSON API with a POST Object request:

    curl -X POST --data-binary @[OBJECT] \
  -H "Authorization: Bearer [OAUTH2_TOKEN]" \
  -H "Content-Type: [OBJECT_CONTENT_TYPE]" \
  -H "x-goog-encryption-algorithm: AES256" \
  -H "x-goog-encryption-key: [NEW_ENCRYPTION_KEY]" \
  -H "x-goog-encryption-key-sha256: [HASH_OF_NEW_KEY]" \
  -H "x-goog-copy-source-encryption-algorithm: AES256" \
  -H "x-goog-copy-source-encryption-key: [OLD_ENCRYPTION_KEY]" \
  -H "x-goog-copy-source-encryption-key-sha256: [HASH_OF_OLD_KEY]" \
  "https://storage.googleapis.com/storage/v1/b/[BUCKET_NAME]/o/[OBJECT_NAME]/rewriteTo/b/[BUCKET_NAME]/o/[OBJECT_NAME]"

    Where:

    • [OBJECT] is the path to the object you are uploading. For example, Desktop/dogs.png.
    • [OAUTH2_TOKEN] is the access token you generated in Step 1.
    • [OBJECT_CONTENT_TYPE] is the content type of the object. For example, image/png.
    • [NEW_ENCRYPTION_KEY] is the new AES-256 key used for encrypting your object.
    • [HASH_OF_NEW_KEY] is the SHA-256 hash for your new AES-256 key.
    • [OLD_ENCRYPTION_KEY] is the current AES-256 key used to encrypt your object.
    • [HASH_OF_OLD_KEY] is the current SHA-256 hash for your AES-256 key.
    • [BUCKET_NAME] is the name of the bucket containing the relevant object. For example, my-bucket.
    • [OBJECT_NAME] is the name of the object whose keys you are rotating. For example, Desktop/dogs.png.

See Encryption request headers for more information on encryption-specific headers.

XML API

  1. Get an authorization access token from the OAuth 2.0 Playground. Configure the playground to use your own OAuth credentials.

  2. Remove the original object from Cloud Storage. To do so, use cURL to call the XML API with a DELETE OBJECT request:

    curl -X DELETE \
  -H "Authorization: Bearer [OAUTH2_TOKEN]" \
  "https://storage.googleapis.com/[BUCKET_NAME]/[OBJECT_NAME]"

    Where:

    • [OAUTH2_TOKEN] is the access token you generated in Step 1.
    • [BUCKET_NAME] is the name of the bucket from which you are removing the object. For example, my-bucket.
    • [OBJECT_NAME] is the name of the object you are removing. For example, Desktop/dogs.png.

  3. Use cURL to call the XML API with a PUT Object request:

    curl -X -i PUT --data-binary @[OBJECT] \
  -H "Authorization: Bearer [OAUTH2_TOKEN]" \
  -H "Content-Type: [OBJECT_CONTENT_TYPE]" \
  -H "x-goog-encryption-algorithm: AES256" \
  -H "x-goog-encryption-key: [NEW_ENCRYPTION_KEY]" \
  -H "x-goog-encryption-key-sha256: [HASH_OF_NEW_KEY]" \
  "https://storage.googleapis.com/[BUCKET_NAME]/[OBJECT_NAME]"

    Where:

    • [OBJECT] is the path to the object you are uploading. For example, Desktop/dogs.png.
    • [OAUTH2_TOKEN] is the access token you generated in Step 1.
    • [OBJECT_CONTENT_TYPE] is the content type of the object. For example, image/png.
    • [NEW_ENCRYPTION_KEY] is the new AES-256 key used to encrypt your object.
    • [HASH_OF_NEW_KEY] is the SHA-256 key for your new AES-256 key.
    • [BUCKET_NAME] is the name of the bucket to which you are uploading the object. For example, my-bucket.
    • [OBJECT_NAME] is the name of the object you are uploading. For example, Desktop/dogs.png.

See Encryption request headers for more information on encryption-specific headers.

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