sha1 - Calculates the sha1 hash of a string.
sha1(str)
Note: In the followings examples, the _ between the { should be removed to make it work.
res={_{sha1("pierre")}}. return res=ff019a5748a52b5641624af88a54a2f0e46a9fb5.
Written by Pusnei Sergey and Caroline Laplante, <sergey@sednove.com>
1.0 2014-09-09 21:24:14 laplante@sednove.com