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Client-Side Field Level Encryption Methods

KeyVault.getKey()

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  • Behavior
  • Example

New in version 4.2.

KeyVault.getKey(UUID)

Gets a data encryption key with the specified UUID. The data encryption key must exist in the key vault associated to the database connection.

getKey() has the following syntax:

keyVault = db.getMongo().getKeyVault()
keyVault.getKey(UUID("<UUID String>"))

The UUID is a BSON binary data object with subtype 4.

Returns:Document representing a matching data encryption key.

If no matching data encryption key is found, KeyVault.getKey() returns an object containing a hint that no key was found.

Behavior

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

The following example uses a locally managed KMS for the client-side field level encryption configuration.

To configure client-side field level encryption for a locally managed key:

  • generate a base64-encoded 96-byte string with no line breaks

  • use mongosh to load the key

export TEST_LOCAL_KEY=$(echo "$(head -c 96 /dev/urandom | base64 | tr -d '\n')")
mongosh --nodb

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

 var autoEncryptionOpts = {
   "keyVaultNamespace" : "encryption.__dataKeys",
   "kmsProviders" : {
     "local" : {
       "key" : BinData(0, process.env["TEST_LOCAL_KEY"])
     }
   }
 }

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.getKey() to retrieve a data encryption key using its UUID:

keyVault = encryptedClient.getKeyVault()
keyVault.getKey(UUID("b4b41b33-5c97-412e-a02b-743498346079"))

getKey() returns the data encryption key, with output similar to the following:

{
  "_id" : UUID("b4b41b33-5c97-412e-a02b-743498346079"),
  "keyMaterial" : BinData(0,"E+0jZKzA4YuE1lGmSVIy2mivqH4JxFo0yFATdxYX/s0YtMFsgVXyu7Bbn4IQ2gn7F/9JAPJFOxdQc5lN3AR+oX33ewVZsd63f3DN1zzcukqdR2Y+EeO7ekRxyRjdzMaNNrBNIv9Gn5LEJgWPSYkG8VczF7cNZnc1YmnR0tuDPNYfm0J7dCZuZUNWW3FCGRcdFx6AlXiCtXKNR97hJ216pQ=="),
  "creationDate" : ISODate("2021-03-16T18:22:43.733Z"),
  "updateDate" : ISODate("2021-03-16T18:22:43.733Z"),
  "status" : 0, "version" : NumberLong(0),
  "masterKey" : {
    "provider" : "local"
  },
  "keyAltNames" : [
     "alpha"
  ]
}

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KeyVault.deleteKey()

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