# File lib/json-schema/uri/uuid.rb, line 77
                def create_sha1 str, namespace
                        sha1 = Digest::SHA1.new
                        sha1.update namespace.raw_bytes
                        sha1.update str
                        sum = sha1.digest
                        raw = mask 5, sum[0..15]
                        ret = new raw
                        ret.freeze
                        ret
                end