how to encrypt with a string as input,but not a key object

From: wqhdebian (wqhhust1_at_sina.com)
Date: 11/22/03 

Date: 22 Nov 2003 02:02:17 -0800

As far as I know,when encrypt or decrypt ,a key must first be got,and
the key is first generate by a tool or from SecurityRandom,that means
I can not generate the same key with the same input.Does there is a
method which can generate a same with the same input string?

   There is a need to transfer file between to site,and the customer
wish to encrypt these files during transfering,and they want to store
a string into each database at each site,when sending and receiving
files,get the string from the database to encrypt or decrypt the
file,they alse want to have a control of the string,they can change
the string randomly if they wish as long as long keep each string is
equal,how to realize this?

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