Java equivalent of SecureString

Question

I'm looking for Java's equivalent of .NET's SecureString.aspx. Is there such implementation available in 2018?

OWASP implementation is not exactly the same because it's just a plain char array. While .NET equivalent provides additional features such as the ability to get an instance from/to unmanaged memory and also encryption.

I'm aware of common Java pattern to pass around passwords as char[] and do Arrays.fill() them with zeros after use. But it requires building a trivial utility class around char[] all the time.

Answer 1

Oracle has a GuardedString implementation. It is the closest match to .NET's SecureString solution.

Secure string implementation that solves the problems associated with keeping passwords as java.lang.String. That is, anything represented as a String is kept in memory as a clear text password and stays in memory at least until it is garbage collected.

The GuardedString class alleviates this problem by storing the characters in memory in an encrypted form. The encryption key will be a randomly-generated key.

In their serialized form, GuardedStrings will be encrypted using a known default key. This is to provide a minimum level of protection regardless of the transport. For communications with the Remote Connector Framework it is recommended that deployments enable SSL for true encryption.

Applications may also wish to persist GuardedString. In the case of Identity Manager, it should convert GuardedStrings to EncryptedData so that they can be stored and managed using the Manage Encryption features of Identity Manager. Other applications may wish to serialize APIConfiguration as a whole. These applications are responsible for encrypting the APIConfiguration blob for an additional layer of security (beyond the basic default key encryption provided by GuardedString).