* src/encrypt.c (encrypt_setup_keys): Factor some code out to ...
(create_context): new.
(encrypt_string): New.
* src/encrypt.h (ENCRYPT_TO_DATABASE): New.
(ENCRYPT_TO_BACKOFFICE): New.
* src/util.c (bintoasc): New.
(base64_encode): New.
(base64_decode): New.
* src/t-util.c (test_base64_encoding): New.
(main): Calt that.