int DB->set_encrypt(DB *db, const char *passwd, u_int32_t flags);
Set the password used by the DB_ENV and DB methods to perform encryption and decryption.
The flags value must be set to 0 or the following value:
Because databases opened within Berkeley DB environments use the password specified to the environment, it is an error to attempt to set a password in a database created within an environment.
The DB->set_encrypt interface may not be called after the DB->open interface is called.
The DB->set_encrypt method returns a non-zero error value on failure and 0 on success.
The DB->set_encrypt method may fail and return a non-zero error for the following conditions:
Called after DB->open was called.
The DB->set_encrypt method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the DB->set_encrypt method may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.
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