diff --git a/irc/commands/crypt.py b/irc/commands/crypt.py
new file mode 100644
index 0000000..29fcd21
--- /dev/null
+++ b/irc/commands/crypt.py
@@ -0,0 +1,43 @@
+# -*- coding: utf-8  -*-
+
+# Cryptography functions (hashing and cyphers).
+
+import hashlib
+
+from irc.base_command import BaseCommand
+
+class Calc(BaseCommand):
+    def get_hooks(self):
+        return ["msg"]
+
+    def get_help(self, command):
+        if command == "hash":
+            return ("Return the hash of a string using a given algorithm, " +
+                    "e.g. '!hash sha512 Hello world!'.")
+        else:
+            return ("{0} a string with a given key using a given algorithm, " +
+                    "e.g. '!{1} blowfish some_key Hello world!'.").format(
+                    command.capitalize(), command)
+
+    def check(self, data):
+        if data.is_command and data.command in ["hash", "encrypt", "decrypt"]:
+            return True
+        return False
+
+    def process(self, data):
+        if not data.args:
+            self.connection.reply(data, "what do you want me to do?")
+            return
+
+        if data.command == "hash":
+            algo = data.args[0]
+            if algo in hashlib.algorithms:
+                string = ' '.join(data.args[1:])
+                result = eval("hashlib.{0}(string)".format(algo)).hexdigest()
+                self.connection.reply(data, result)
+            else:
+                self.connection.reply(data, "unknown algorithm: {0}".format(
+                        algo))
+
+        else:
+            self.connection.reply(data, "not implemented yet!")