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  • Behavior
  • Example
KeyVault.rewrapManyDataKey(filter, options)

Decrypts multiple Data Encryption Keys (DEK) and re-encrypts them with a new Customer Master Key (CMK). Use this method to rotate the CMK that encrypts your DEKs. To learn more about CMKs and DEKs, see Data Encryption Keys and the Customer Master Key.

You specify a CMK through the masterKey parameter. If you do not include a masterKey argument, the method decrypts and encrypts each DEK with the CMK referenced in that DEK's metadata. To learn more about the metadata of DEKs, see Metadata Used for Decryption.

KeyVault.rewrapManyDataKey has the following syntax:

let keyVault = db.getMongo().getKeyVault()
The query filter for the keyvault collection

This document has two fields:

  • provider: A KMS provider (AWS KMS, Azure Key Vault, GCP KMS, the local provider, or KMIP)

  • masterKey: A KMS-specific key used to encrypt the new data key

Returns:A BulkWriteResult object that reports how many data keys were affected.


Back-Up Your Key Vault collection

Before you rotate your Data Encryption Keys, ensure you create a backup of your Key Vault collection. If you lose access to your Data Encryption Keys, you will lose all your encrypted data.

To learn how to create a backup of a collection, see Back Up and Restore with MongoDB Tools.


Key Rotation Support

To view your driver's dependencies for the key rotation API, see Compatibility.

This operation is not atomic and should not be run in parallel with other key management operations.

The mongosh client-side field level encryption methods require a database connection with client-side field level encryption enabled. If the current database connection was not initiated with client-side field level encryption enabled, either:

These examples allow you to rapidly evaluate client-side field level encryption. For specific examples using each supported KMS provider, see Encryption Key Management.


Start the mongosh client.

mongosh --nodb

To configure client-side field level encryption for a locally managed key, generate a base64-encoded 96-byte string with no line breaks.

const TEST_LOCAL_KEY = require("crypto").randomBytes(96).toString("base64")

Create the client-side field level encryption options using the generated local key string:

var autoEncryptionOpts = {
"keyVaultNamespace" : "encryption.__dataKeys",
"kmsProviders" : {
"local" : {
"key" : BinData(0, TEST_LOCAL_KEY)

Use the Mongo() constructor with the client-side field level encryption options configured to create a database connection. Replace the mongodb:// URI with the connection string URI of the target cluster.

encryptedClient = Mongo(

Retrieve the KeyVault object and use the KeyVault.rewrapManyDataKey() method to rewrap the existing keys in a new masterKey. If no new masterKey is given, each data key retains its respective current masterKey.

The following example shows how you can rewrap each data key with its respective current masterKey:

let keyVault = mongo.getKeyVault()

The following example shows how you can rewrap each data key with a new masterKey:

let keyVault = mongo.getKeyVault()
keyVault.rewrapManyDataKey({}, {
provider: 'aws',
masterKey: {
region: 'us-east-2',
key: 'arn:aws:kms:us-east-2:...'

The following example shows how to rewrap data keys that have not been rewrapped in the previous thirty days.

let keyVault = mongo.getKeyVault()
const thirtyDaysAgo = new Date( - 30 * 24 * 60 * 60 * 1000);
keyVault.rewrapManyDataKey({ updateDate: { $lt: thirtyDaysAgo } });

KeyVault.rewrapManyDataKey() returns a BulkWriteResult object detailing how many data keys were affected:

bulkWriteResult: BulkWriteResult {
result: {
ok: 1,
writeErrors: [],
writeConcernErrors: [],
insertedIds: [],
nInserted: 0,
nUpserted: 0,
nMatched: 3,
nModified: 3,
nRemoved: 0,
upserted: [],
opTime: { ts: Timestamp({ t: 1655840760, i: 3 }), t: 23 }





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