#include <db_cxx.h> int DbEnv::set_encrypt(const char *passwd, u_int32_t flags);
Set the password used by the Berkeley DB library to perform encryption and decryption.
         The DbEnv::set_encrypt() method configures a database environment,
         not only operations performed using the specified 
         DbEnv  handle.
    
         The DbEnv::set_encrypt() method may not be called after the 
         DbEnv::open()  method is called.
         If the database environment already exists when 
         DbEnv::open()  is called, the
         information specified to DbEnv::set_encrypt() must be consistent
         with the existing environment or an error will be returned.
    
         The DbEnv::set_encrypt() 
            
            
                method either returns a non-zero error value or throws an
                exception that encapsulates a non-zero error value on
                failure, and returns 0 on success.
            
        
    
                         The DbEnv::set_encrypt() 
            
            
                method may fail and throw a DbException 
                exception, encapsulating one of the following non-zero errors, or return one
                of the following non-zero errors:
            
        
                    
If the method was called after DbEnv::open() was called; or if an invalid flag value or parameter was specified.