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Client-Side Field Level Encryption

KeyVault.removeKeyAlternateName()

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  • Compatibility
  • Syntax
  • Behavior
  • Example
KeyVault.removeKeyAlternateName(UUID, keyAltName)

Removes the specified keyAltName from the data encryption key with the specified UUID. The data encryption key must exist in the key vault associated to the database connection.

Returns:The data encryption key prior to updating the keyAltName.

Returns null if no data encryption key has the specified UUID().

Compatibility

This command is available in deployments hosted in the following environments:

  • MongoDB Atlas: The fully managed service for MongoDB deployments in the cloud

  • MongoDB Enterprise: The subscription-based, self-managed version of MongoDB

  • MongoDB Community: The source-available, free-to-use, and self-managed version of MongoDB

Syntax

removeKeyAlternateName() has the following syntax:

keyVault = db.getMongo().getKeyVault()
keyVault.removeKeyAlternateName(
   UUID("<UUID string>"),
   "keyAltName"
)

Behavior

Requires Configuring Client-Side Field Level Encryption on Database Connection

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:

Example

The following example is intended for rapid evaluation of client-side field level encryption. For specific examples of using KeyVault.removeKeyAlternateName() with each supported KMS provider, see Manage a Data Encryption Key's Alternate Name.

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')")
mongosh --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://myMongo.example.net URI with the connection string URI of the target cluster.

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

Retrieve the keyVault object and use the KeyVault.removeKeyAlternateName() method to remove the specified key alternate name from the data encryption key with matching UUID:

keyVault = encryptedClient.getKeyVault()
keyVault.removeKeyAlternateName(UUID("b4b41b33-5c97-412e-a02b-743498346079"),"Other-Data-Encryption-Key")

If successful, removeKeyAlternateName() returns the data encryption key prior to updating the keyAltName.

{
    "_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" : [
        "ssn-encryption-key"
    ]
}

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