sha or md5 digest algorithm

hello
i am migrating from mysql to db2 database and my application widely uses
mysq's sha1() function. i searched the web and haven't fount anything
similar yet; there is only encrypt scalar funcrion which hardly may be
used. so my question is: can i achieve the same functionality as mysql's
sha1() or md5() dunctions provide?
thanks in advance
ivan matviyuk