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ClientEncryption.decrypt()

ClientEncryption.decrypt(encryptedValue)

ClientEncryption.decrypt() decrypts the encryptionValue if the current database connection was configured with access to the Key Management Service (KMS) and key vault used to encrypt encryptionValue.

Returns:The decrypted value.

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

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

ClientEncryption.decrypt has the following syntax:

clientEncryption = db.getMongo().getClientEncryption()
clientEncryption.decrypt(encryptedValue)

The encryptedValue must be a binary data object with subtype 6 created using client-side field level encryption.

Read operations issued from a database connection configured with access to the correct Key Management Service (KMS) and Key Vault can automatically decrypt field values encrypted using ClientEncryption.encrypt(). Clients only need to use decrypt() to decrypt Binary subtype 6 values not stored within a document field.

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:

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

1
  1. Start mongosh

    Run:

    mongosh --nodb

    --nodb means don't connect to a database.

  2. Generate a Key String

    Generate a base 64 96-byte string:

    const TEST_LOCAL_KEY = require("crypto").randomBytes(96).toString("base64")
  3. Create an Encryption Options Object

    To create a client-side field level encryption options object, use the TEST_LOCAL_KEY string from the previous step:

    var autoEncryptionOpts = {
    "keyVaultNamespace" : "encryption.__dataKeys",
    "kmsProviders" : {
    "local" : {
    "key" : BinData(0, TEST_LOCAL_KEY)
    }
    }
    }
  4. Create an Encrypted Client Object

    To create an encrypted client object, use the Mongo() constructor. Replace the mongodb://myMongo.example.net URI with the connection string URI for the target cluster. For example:

    encryptedClient = Mongo(
    "mongodb://myMongo.example.net:27017/?replSetName=myMongo",
    autoEncryptionOpts
    )
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Retrieve the ClientEncryption object and use the ClientEncryption.decrypt() method to decrypt a value encrypted by ClientEncryption.encrypt().

clientEncryption = encryptedClient.getClientEncryption();
clientEncryption.decrypt(BinData(6,"AmTi2H3xaEk8u9+jlFNaLLkC3Q/+kmwDbbWrq+h9nuv9W+u7A5a0UnpULBNZH+Q21fAztPpU09wpKPrju9dKfpN1Afpj1/ZhFcH6LYZOWSBBOAuUNjPLxMNSYOOuITuuYWo="))

If successful, decrypt() returns the decrypted value:

"123-45-6789"

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