Create island_password_hasher.py

Used for Monkey Island password hash see
https://github.com/guardicore/monkey/wiki/Enabling-Monkey-Island-Password-Protection

monkey/monkey_island/scripts/island_password_hasher.py

@@ -0,0 +1,23 @@
+"""
+Utility script for running a string through SHA3_512 hash.
+Used for Monkey Island password hash, see
+https://github.com/guardicore/monkey/wiki/Enabling-Monkey-Island-Password-Protection
+for more details.
+"""
+
+import argparse
+from Crypto.Hash import SHA3_512
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("string_to_sha", help="The string to do sha for")
+    args = parser.parse_args()
+
+    h = SHA3_512.new()
+    h.update(args.string_to_sha)
+    print(h.hexdigest())
+
+
+if __name__ == '__main__':
+    main()