bcrypt module for eXist-db
module namespace: "http://max.terpstra.ca/ns/exist-bcrypt"
Provides three functions:
bcrypt:hash($password as xs:string) as xs:string
bcrypt:hash($password as xs:string, $work as xs:positiveInteger) as xs:string
bcrypt:matches($hash as xs:string, $plain as xs:string) as xs:boolean