New in version 4.2.


Gets all data encryption keys with the specified keyAltName.

getKeyByAltName() has the following syntax:

keyVault = db.getMongo().getKeyVault()
Returns:Document representing a matching data encryption key.

Returns nothing if no data encryption key has the specified keyAltName.

The mongo 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:

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

Configuring client-side field level encryption for a locally managed key requires specifying a base64-encoded 96-byte string with no line breaks. The following operation generates a key that meets the stated requirements and loads it into the mongo shell:

TEST_LOCAL_KEY=$(echo "$(head -c 96 /dev/urandom | base64 | tr -d '\n')")
mongo --nodb --shell --eval "var TEST_LOCAL_KEY='$TEST_LOCAL_KEY'"

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

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

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

encryptedClient = Mongo(

Retrieve the KeyVault object and use the KeyVault.getKeyByAltName() method to retrieve the data encryption key whose keyAltNames array includes the specified key alternate name:


getKeyByAltName() returns the following data encryption key:

"_id" : UUID("b4b41b33-5c97-412e-a02b-743498346079"),
"keyMaterial" : BinData(0,"PXRsLOAYxhzTS/mFQAI8486da7BwZgqA91UI7NKz/T/AjB0uJZxTvhvmQQsKbCJYsWVS/cp5Rqy/FUX2zZwxJOJmI3rosPhzV0OI5y1cuXhAlLWlj03CnTcOSRzE/YIrsCjMB0/NyiZ7MRWUYzLAEQnE30d947XCiiHIb8a0kt2SD0so8vZvSuP2n0Vtz4NYqnzF0CkhZSWFa2e2yA=="),
"creationDate" : ISODate("2019-08-12T21:21:30.569Z"),
"updateDate" : ISODate("2019-08-12T21:21:30.569Z"),
"status" : 0,
"version" : NumberLong(0),
"masterKey" : {
"provider" : "local"
"keyAltNames" : [
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