ClientEncryption.encrypt()

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Compatibility

Syntax
Behavior
Example

MongoDB 5.0 is end of life as of October 2024. This version of the documentation is no longer supported. To upgrade your 5.0 deployment, see the MongoDB 6.0 upgrade procedures.

ClientEncryption.encrypt(encryptionKeyId, value, encryptionAlgorithm)

ClientEncryption.encrypt() encrypts the value using the specified encryptionKeyId and encryptionAlgorithm. encrypt() supports explicit (manual) encryption of field values.

Returns:	A `binary data` object with subtype 6.

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

clientEncryption = db.getMongo().getClientEncryption()
clientEncryption.encrypt(
  encryptionKeyId,
  value,
  encryptionAlgorithm
)

Parameter	Type	Description
`encryptionKeyId`	`UUID`	The data encryption key to use for encrypting the `value`. The UUID is a BSON `binary data` object with subtype `4` that identifies a specific data encryption key. If the data encryption key does not exist in the key vault configured for the database connection, `encrypt()` returns an error. See Encryption Key Vault for more information on key vaults and data encryption keys.
`value`	See Unsupported BSON Types.	The value to encrypt.
`encryptionAlgorithm`	string	The encryption algorithm to use for encrypting the `value`. `AEAD_AES_256_CBC_HMAC_SHA_512-Deterministic` `AEAD_AES_256_CBC_HMAC_SHA_512-Random` For complete documentation on the supported encryption algorithms, see Encryption Algorithms.

Behavior

Enable 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:

Use the Mongo() constructor from the mongo shell to establish a connection with the required client-side field level encryption options. The Mongo() method supports the following Key Management Service (KMS) providers for Customer Master Key (CMK) management:
or
Use the mongo shell command line options to establish a connection with the required options. The command line options only support the Amazon Web Services KMS provider for CMK management.

Unsupported BSON Types

encrypt() does not supports encrypting values with the following BSON types:

minKey
maxKey
null
undefined

If encrypting a field using AEAD_AES_256_CBC_HMAC_SHA_512-Deterministic, encrypt() does not support the following BSON types:

double
decimal128
bool
object
array

Example

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')")
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 ClientEncryption object and use the ClientEncryption.encrypt() method to encrypt a value using a specific data encryption key UUID and encryption algorithm:

clientEncryption = encryptedClient.getClientEncryption();
clientEncryption.encrypt(
  UUID("64e2d87d-f168-493c-bbdf-a394535a2cb9"),
  "123-45-6789",
  "AEAD_AES_256_CBC_HMAC_SHA_512-Random"
)

If sucessful, encrypt() returns the encrypted value:

BinData(6,"AmTi2H3xaEk8u9+jlFNaLLkC3Q/+kmwDbbWrq+h9nuv9W+u7A5a0UnpULBNZH+Q21fAztPpU09wpKPrju9dKfpN1Afpj1/ZhFcH6LYZOWSBBOAuUNjPLxMNSYOOuITuuYWo=")

For complete documentation on initiating MongoDB connections with client-side field level encryption enabled, see Mongo().

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Client-Side Field Level Encryption

ClientEncryption.decrypt