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Client-Side Field Level Encryption Methods

KeyVault.rewrapManyDataKey()

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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()
keyVault.rewrapManyDataKey(
  <filter>,
  <options>
)
Parameter
Type
Description
filter
The query filter for the keyvault collection
options
document

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.

Warning

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.

Important

Key Rotation Support

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

Behavior

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

Requires Configuring Client-Side Field Level Encryption on Database Connection

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:

Example

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

1

Start mongosh

Start the mongosh client.

mongosh --nodb
2

Generate Your Key

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")
3

Create the Client-Side Field Level Encryption Options

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)
     }
   }
 }
4

Create Your Encrypted Client

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

encryptedClient = Mongo(
  "mongodb://myMongo.example.net:27017/?replSetName=myMongo",
   autoEncryptionOpts
)

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.

Rewrap Data Keys with the Current masterKey

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

let keyVault = mongo.getKeyVault()
keyVault.rewrapManyDataKey()

Rewrap Data Keys with a New masterKey

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:...'
  }
})

Rewrap Data Keys That Have Not Been Rewrapped Recently

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(Date.now() - 30 * 24 * 60 * 60 * 1000);
keyVault.rewrapManyDataKey({ updateDate: { $lt: thirtyDaysAgo } });

Output

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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KeyVault.getKeyByAltName()

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