Initial data commit

Task/Parallel-brute-force/Sidef/parallel-brute-force.sidef

@@ -0,0 +1,29 @@
+func invert_sha256(hash) {
+
+    var letters = @('a'..'z')
+
+    var job = func (prefix, hash) {
+        variations_with_repetition(letters, 4, {|*a|
+            var s = join('', prefix, a...)
+            return s if (s.sha256 == hash)
+        })
+        return nil
+    }
+
+    letters.map {|prefix|
+        job.ffork(prefix, hash)
+    }.each {|f|
+        with (f.wait) { return _ }
+    }
+}
+
+var tests = %w(
+  1115dd800feaacefdf481f1f9070374a2a81e27880f187396db67958b207cbad
+  3a7bd3e2360a3d29eea436fcfb7e44c735d117c42d1c1835420b6b9942dd4f1b
+  74e1bb62f8dabb8125a58852b63bdf6eaef667cb56ac7f7cdba6d7305c50a22f
+)
+
+tests.each {|t|
+    var phrase = invert_sha256(t)
+    say "#{t} : #{phrase}"
+}