driver-core/src/main/com/mongodb/MongoCredential.java
@SuppressWarnings("deprecation")
    @Deprecated
    public static MongoCredential createMongoCRCredential(final String userName, final String database, final char[] password) {
        return new MongoCredential(MONGODB_CR, userName, database, password);
    }
@SuppressWarnings("deprecation")
    @Deprecated
    public static MongoCredential createMongoCRCredential(final String userName, final String database, final char[] password) {
        return new MongoCredential(MONGODB_CR, userName, database, password);
    }
Creates a MongoCredential instance for the MongoDB Challenge Response protocol. Use this method only if you want to ensure that
the driver uses the MONGODB_CR mechanism regardless of whether the server you are connecting to supports a more secure
authentication mechanism.  Otherwise use the {@link #createCredential(String, String, char[])} method to allow the driver to
negotiate the best mechanism based on the server version.

@param userName the user name
@param database the database where the user is defined
@param password the user's password
@return the credential
@see #createCredential(String, String, char[])
@mongodb.driver.manual core/authentication/#mongodb-cr-authentication MONGODB-CR
@deprecated MONGODB-CR was replaced by SCRAM-SHA-1 in MongoDB 3.0, and is now deprecated. Use
the {@link #createCredential(String, String, char[])} factory method instead.