release winning entries of IOCCC28 under the year 2024

Congratulations to:

* 2024/anders - Prize in sound coding - layered music generator
* 2024/burton - Prize in pentagrammatology - wordle hard mode solver
* 2024/cable1 - Prize in bot talk - LLM inference engine
* 2024/cable2 - Prize in murky waters - salmon recipe
* 2024/carlini - Prize in perfect timing - Intel 4004 emulation
* 2024/codemeow - Prize in tray planting - bonsai generator
* 2024/endoh1 - Prize in patient pointillism - slow ray tracer in CPP
* 2024/endoh2 - Prize in solid body physics - rotating rigid body simulation
* 2024/ferguson1 - Prize in diabolical logistics - Oregon trail pact with the devil
* 2024/ferguson2 - Prize in yil-tas - Navajo code talker translator
* 2024/howe - Nice accent eh-ward - mini vi
* 2024/kramer - Prize in linguistic arithmetic - natural language numerical calculator
* 2024/kurdyukov1 - Prize in phased periodicity - phase of the Moon
* 2024/kurdyukov2 - Prize in art restoration - JPEG artifact removal
* 2024/kurdyukov3 - Prize in virtual quietus - gaming VM and doom
* 2024/kurdyukov4 - Prize in embiggening - encode without literals
* 2024/maffiodo - Prize in creative interpretation - Jav\*script interpreter
* 2024/mills - Prize in ℤ₃ - Infocom v3 story interpreter
* 2024/stedolan - Best one liner - icon from MD5
* 2024/straadt - Prize in imitative rebooting - OpenRISC CPU and Linux
* 2024/tmarrec - Prize in cyclonic coding - 3D tornado simulation
* 2024/tompng - Prize in quasi bijection - vortex encryptor decryptor
* 2024/weaver - Sur prize - rickroll

Ran `make update` to perform the above.
 	new file:   2024/burton/.entry.json

2024/tompng/.entry.json

@@ -0,0 +1,105 @@
+{
+    "no_comment" : "mandatory comment: because comments were removed from the original JSON spec",
+    "entry_JSON_format_version" : "1.2 2024-09-25",
+    "award" : "Prize in quasi bijection",
+    "year" : 2024,
+    "dir" : "tompng",
+    "entry_id" : "2024_tompng",
+    "title" : "vortex",
+    "abstract" : "vortex encryptor decryptor",
+    "author_set" : [
+        {
+            "author_handle" : "Tompng"
+        }
+    ],
+    "manifest" : [
+        {
+            "file_path" : "prog.c",
+            "inventory_order" : 20,
+            "OK_to_edit" : true,
+            "display_as" : "c",
+            "display_via_github" : true,
+            "entry_text" : "entry source code"
+        },
+        {
+            "file_path" : "Makefile",
+            "inventory_order" : 30,
+            "OK_to_edit" : true,
+            "display_as" : "makefile",
+            "display_via_github" : true,
+            "entry_text" : "entry Makefile"
+        },
+        {
+            "file_path" : "prog.orig.c",
+            "inventory_order" : 50,
+            "OK_to_edit" : false,
+            "display_as" : "c",
+            "display_via_github" : true,
+            "entry_text" : "original source code"
+        },
+        {
+            "file_path" : "sample.txt",
+            "inventory_order" : 100,
+            "OK_to_edit" : true,
+            "display_as" : "text",
+            "display_via_github" : true,
+            "entry_text" : "sample IOCCC text"
+        },
+        {
+            "file_path" : "try.sh",
+            "inventory_order" : 100,
+            "OK_to_edit" : true,
+            "display_as" : "shellscript",
+            "display_via_github" : true,
+            "entry_text" : "script to try entry"
+        },
+        {
+            "file_path" : "2024_tompng.tar.bz2",
+            "inventory_order" : 1415926535,
+            "OK_to_edit" : false,
+            "display_as" : "tbz2",
+            "display_via_github" : false,
+            "entry_text" : "download entry tarball"
+        },
+        {
+            "file_path" : ".entry.json",
+            "inventory_order" : 4000000000,
+            "OK_to_edit" : true,
+            "display_as" : "json",
+            "display_via_github" : true,
+            "entry_text" : "entry summary and manifest in JSON"
+        },
+        {
+            "file_path" : ".gitignore",
+            "inventory_order" : 4000000000,
+            "OK_to_edit" : true,
+            "display_as" : "gitignore",
+            "display_via_github" : true,
+            "entry_text" : "list of files that should not be committed under git"
+        },
+        {
+            "file_path" : ".path",
+            "inventory_order" : 4000000000,
+            "OK_to_edit" : false,
+            "display_as" : "path",
+            "display_via_github" : false,
+            "entry_text" : "directory path from top level directory"
+        },
+        {
+            "file_path" : "README.md",
+            "inventory_order" : 4000000000,
+            "OK_to_edit" : true,
+            "display_as" : "markdown",
+            "display_via_github" : true,
+            "entry_text" : "markdown source for this web page"
+        },
+        {
+            "file_path" : "index.html",
+            "inventory_order" : 4294967295,
+            "OK_to_edit" : false,
+            "display_as" : "html",
+            "display_via_github" : false,
+            "entry_text" : "this web page"
+        }
+    ]
+}

2024/tompng/.gitignore

@@ -0,0 +1,4 @@
+prog1.enc.c
+prog2.enc.c
+rand
+rand.c

2024/tompng/.path

@@ -0,0 +1 @@
+2024/tompng

2024/tompng/Makefile

@@ -0,0 +1,212 @@
+#!/usr/bin/env make
+#
+# 2024/tompng
+
+#############################
+# shell used by this Makefile
+#############################
+
+SHELL= bash
+
+
+#######################
+# common tool locations
+#######################
+
+include ../../var.mk
+
+
+#####################
+# C compiler settings
+#####################
+
+# Common C compiler warnings to silence
+#
+# Example: CSILENCE= -Wno-poison-system-directories
+#
+CSILENCE= -Wno-misleading-indentation -Wno-builtin-requires-header -Wno-implicit-function-declaration
+
+# Attempt to silence unknown warning options
+#
+CUNKNOWN= -Wno-unknown-warning-option
+
+# Common C compiler warning flags
+#
+# NOTE: The addition of -pedantic to CWARN is a challenge that
+#       You may wish to avoid if it proves too problematic.
+#       There is NO penalty for removing -pedantic from CWARN.
+#
+CWARN= -Wall -Wextra -pedantic ${CSILENCE} ${CUNKNOWN}
+
+# Compiler standard
+#
+CSTD= -std=gnu17
+
+# Compiler bit architecture
+#
+# Example for 32-bitness: ARCH= -m32
+# Example for 64-bitness: ARCH= -m64
+#
+# NOTE: Normally one should NOT specify a specific architecture.
+#
+ARCH=
+
+# Defines that are needed to compile
+#
+# Example: -Dfoo -Dbar=baz
+#
+CDEFINE=
+
+# Include files that are needed to compile
+#
+# Example: CINCLUDE= -include stdio.h
+#
+CINCLUDE=
+
+# Other flags to pass to the C compiler
+#
+# Example: COTHER= -fno-math-errno
+#
+COTHER=
+
+# Optimization
+#
+# NOTE: Feel free to change the level of compiler optimization.
+#       The "-O3" is just a friendly default you might wish to try.
+#
+# Example: OPT= -O0 -g
+#
+OPT= -O3
+
+# Default flags for ANSI C compilation
+#
+CFLAGS= ${CSTD} ${CWARN} ${ARCH} ${CDEFINE} ${CINCLUDE} ${COTHER} ${OPT}
+
+# Libraries needed to build
+#
+# Example: LDFLAGS= -lncurses -lm
+#
+LDFLAGS=
+
+# C compiler to use
+#
+# NOTE: The IOCCC Judges recommend you leave CC as just "cc"
+#       and NOT set it to clang, or gcc, or something else
+#       unless you have a STRONG reason to do so.
+#
+#       Setting CC to something other than "cc" makes your
+#       code less portable to those who do not have your
+#       particular C compiler.  **hint**
+#
+#       If you want to test your code with a particular C compiler,
+#       use the make command line.  For example:
+#
+#           make all CC=clang
+#           make all CC=gcc
+#
+CC= cc
+
+# Compiler add-ons or replacements for clang only
+#
+ifeq "$(findstring $(CLANG),${CC})" "$(CLANG)"
+#
+# NOTE: This code is only invoked when CC is "clang"
+#       such as when you use the make command line:
+#
+#           make all CC=clang
+#
+CSILENCE+= -Wno-comma -Wno-implicit-int-conversion -Wno-missing-prototypes \
+	-Wno-missing-variable-declarations -Wno-poison-system-directories \
+	-Wno-shorten-64-to-32
+#
+CWARN+= -Weverything
+#
+endif
+
+# Specific add-ons or replacements for gcc only
+#
+ifeq "$(findstring $(GCC),${CC})" "$(GCC)"
+#
+# NOTE: This code is only invoked when CC is "gcc"
+#       such as when you use the make command line:
+#
+#    make all CC=gcc
+#
+CSILENCE+=
+#
+CWARN+=
+#
+endif
+
+
+###########################################
+# Special Makefile variables for this entry
+###########################################
+
+ENTRY= prog
+PROG= ${ENTRY}
+#
+OBJ= ${PROG}.o
+TARGET= ${PROG}
+#
+ALT_OBJ=
+ALT_TARGET=
+
+# list any data files supplied with your submission
+#
+# Example: DATA= curds whey
+#
+DATA=
+
+
+#################
+# build the entry
+#################
+
+all: data ${TARGET}
+	@${TRUE}
+
+.PHONY: all alt data everything clean clobber
+
+# how to compile
+#
+${PROG}: ${PROG}.c
+	${CC} ${CFLAGS} ${PROG}.c -o $@ ${LDFLAGS}
+
+# alternative executable
+#
+alt: data ${ALT_TARGET}
+	@${TRUE}
+
+${PROG}.alt: ${PROG}.alt.c
+	${CC} ${CFLAGS} ${PROG}.alt.c -o $@ ${LDFLAGS}
+
+# data files
+#
+data: ${DATA}
+	@${TRUE}
+
+# both all and alt
+#
+everything: all alt
+	@${TRUE}
+
+
+###############
+# utility rules
+###############
+#
+clean:
+	${RM} -f ${OBJ} ${ALT_OBJ}
+
+clobber: clean
+	${RM} -f ${TARGET} ${ALT_TARGET}
+	${RM} -rf *.dSYM
+	${RM} -f prog1.enc.c prog2.enc.c rand rand.c
+
+
+######################################
+# optional include of 1337 hacker rulz
+######################################
+
+-include 1337.mk ../1337.mk ../../1337.mk

2024/tompng/README.md

@@ -0,0 +1,130 @@
+## To build:
+
+``` <!---sh-->
+    make all
+```
+
+
+## To use:
+
+
+### Encryption
+
+``` <!---sh-->
+    prog < file.txt > file.enc.txt
+```
+
+
+### Decryption
+
+``` <!---sh-->
+    prog < file.enc.txt > file.txt
+```
+
+
+### Command line arguments
+
+You can also specify SIZE of the text-stirring area and a PASSWORD.
+
+``` <!---sh-->
+    ./prog 30 < input > output
+    ./prog PASSWORD < input > output
+    ./prog 40 PASSWORD < input > output
+```
+
+You need to specify the same SIZE and PASSWORD to decrypt correctly.
+
+
+## Try:
+
+``` <!---sh-->
+    ./try.sh
+```
+
+
+## Judges' remarks:
+
+It is well-known that the Enigma cipher was broken due to the fact that a letter could never map to itself.
+Is this algorithm susceptible to a similar cryptanalysis?
+
+
+## Author's remarks:
+
+
+### Vortex Encryptor/Decryptor
+
+Secure encryption/decryption is a black box. It's highly based on difficult mathematics. We just blindly TRUST when using it.
+
+This entry is a visual vortex encryptor/decryptor for a text file.
+You can visually see how this program stirs the text to encrypt/decrypt. It's not a black box at all.
+
+
+### Easter Eggs
+
+
+#### Random Encryptor/Decryptor
+
+Some might dislike vortex-encryption algorithm. Alternately, there is one more visual text mixing algorithm.
+
+``` <!---sh-->
+    ./prog < prog.c > rand.c
+```
+
+This program `rand.c` is NOT A VORTEX encryptor/deryptor. You can see the text `N O /,T  ,A` somewhere in the code. It randomly swaps characters instead of stirring with vortex.
+
+To check the randomness, compile it as an executable `rand` and try `./rand < prog.c` or `./rand < rand.c`.
+You can find that the encrypted text claims to be really RAND/rand-om.
+
+
+#### Important Passwords
+
+"password" is the 1st most used alphabet password in the world. Wait, what's the 0th used password? It might be "ioccc" or "IOCCC".
+Let's encrypt prog.c with these passwords.
+
+``` <!---sh-->
+    ./prog ioccc < prog.c > prog1.enc.c
+    ./prog IOCCC < prog.c > prog2.enc.c
+```
+
+Imagine if you accidentally hit your head hard, forgot the password, lost everything except prog executable and the encrypted prog.c file.
+There's nothing to worry about. Just like important passwords often written on sticky notes, you can find this password in the encrypted text.
+
+
+### Internal
+
+
+#### Encryption/Decryption
+
+This program internally have forward-text-stir and backward-text-stir operation.
+It tries both operation and select the one that makes the output have less entropy.
+This is why this program doesn't need a command line argument such as `--encrypt` or `--decrypt`.
+
+
+#### Seed and Hash
+
+For security reason, vortex used to encrypt/decrypt varies over input text.
+Seed is calculated with vortex-stir-stable hash algorithm. This hash doesn't change over encryption/decryption.
+This is making hard to embed easter eggs into this program.
+
+
+#### Vortex stirring algorithm
+
+Character should not disappear by vortex stirring operation, so the velocity field of the vortex is required to be no divergence.
+Velocity field that has no divergence can be created from a [stream function](https://en.wikipedia.org/wiki/Stream_function).
+In this program, stream function which is a scalar field is made of horizontal, vertical and diagonal periodic waves.
+With a simple mathematics, this vortex stirring operation can be decomposed into horizontal, vertical, and diagonal array rotation which is a reversible operation.
+
+
+<!--
+
+    Copyright © 1984-2025 by Landon Curt Noll and Leonid A. Broukhis.  All Rights Reserved.
+
+    You are free to share and adapt this file under the terms of this license:
+
+        Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+    For more information, see:
+
+        https://creativecommons.org/licenses/by-sa/4.0/
+
+-->

2024/tompng/index.html

@@ -0,0 +1,644 @@
+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+<!-- START: two lines up starts content from: inc/top.default.html -->
+
+<!-- END: this line ends content from: inc/top.default.html -->
+<!-- START: this line starts content from: inc/head.default.html -->
+
+<head>
+<link rel="stylesheet" href="../../ioccc.css">
+<link href="https://fonts.googleapis.com/css2?family=Outfit:wght@100..900&display=swap" rel="stylesheet">
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
+<title>2024/tompng - Prize in quasi bijection</title>
+<link rel="icon" type="image/x-icon" href="../../favicon.ico">
+<meta name="description" content="2024 IOCCC entry tompng - Prize in quasi bijection">
+<meta name="keywords" content="IOCCC, 2024, IOCCC 2024, IOCCC entry, tompng, Prize in quasi bijection">
+</head>
+
+<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
+<!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
+<!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
+<!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
+<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
+
+<!-- END: this line ends content from: inc/head.default.html -->
+
+<!-- -->
+<!-- This web page was formed via the tool: bin/readme2index.sh -->
+<!-- The content of main section of this web page came from: 2024/tompng/README.md -->
+<!-- -->
+
+<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
+<!-- !!! Do not modify this web page, instead modify the file: 2024/tompng/README.md !!! -->
+<!-- !!! Do not modify this web page, instead modify the file: 2024/tompng/README.md !!! -->
+<!-- !!! Do not modify this web page, instead modify the file: 2024/tompng/README.md !!! -->
+<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
+
+<!-- Markdown content was converted into HTML via the tool: bin/md2html.sh -->
+
+<!-- START: this line starts content from: inc/body.default.html -->
+
+<body>
+
+<!-- END: this line ends content from: inc/body.default.html -->
+<!-- START: this line starts content from: inc/topbar.default.html -->
+
+<div class="theader">
+  <nav class="topbar">
+    <div class="container">
+      <div class="logo">
+        <a href="../../index.html" class="logo-link">
+          IOCCC
+       </a>
+      </div>
+
+      <div class="topbar-items">
+        <div class="item">
+          <span class="item-header">
+            Entries
+          </span>
+
+          <div class="sub-item">
+
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+              <a href="../../years.html" class="sub-item-link">
+                Winning entries
+              </a>
+            </div>
+
+            <div class="outfit-font">
+              <a href="../../authors.html" class="sub-item-link">
+                Winning authors
+              </a>
+            </div>
+
+            <div class="outfit-font">
+              <a href="../../location.html" class="sub-item-link">
+                Location of authors
+              </a>
+            </div>
+
+            <div class="outfit-font">
+              <a href="../../bugs.html" class="sub-item-link">
+                Bugs and (mis)features
+              </a>
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+              <a href="../../faq.html#fix_an_entry" class="sub-item-link">
+                Fixing entries
+              </a>
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+
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+              <a href="../../faq.html#fix_author" class="sub-item-link">
+                Updating author info
+              </a>
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+
+          </div>
+        </div>
+
+        <div class="item">
+          <span class="item-header">
+            Status
+          </span>
+
+          <div class="sub-item">
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+            <div class="outfit-font">
+              <a href="../../news.html" class="sub-item-link">
+                News
+              </a>
+            </div>
+
+            <div class="outfit-font">
+              <a href="../../status.html" class="sub-item-link">
+                Contest status
+              </a>
+            </div>
+
+            <div class="outfit-font">
+              <a href="../../next/rules.html" class="sub-item-link">
+                IOCCC rules
+              </a>
+            </div>
+
+            <div class="outfit-font">
+              <a href="../../next/guidelines.html" class="sub-item-link">
+                IOCCC guidelines
+              </a>
+            </div>
+
+            <div class="outfit-font">
+              <a href="../../markdown.html" class="sub-item-link">
+                Markdown guidelines
+              </a>
+            </div>
+
+            <div class="outfit-font">
+              <a href="../../SECURITY.html" class="sub-item-link">
+                Security policy
+              </a>
+            </div>
+
+          </div>
+        </div>
+
+        <div class="item">
+          <span class="item-header">
+            FAQ
+          </span>
+
+          <div class="sub-item">
+
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+              <a href="../../faq.html" class="sub-item-link">
+                Frequently asked questions
+              </a>
+            </div>
+
+            <div class="outfit-font">
+              <a href="../../quick-start.html#enter" class="sub-item-link">
+                Enter the IOCCC
+              </a>
+            </div>
+
+            <div class="outfit-font">
+              <a href="../../faq.html#compiling" class="sub-item-link">
+                Compiling entries
+              </a>
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+
+            <div class="outfit-font">
+              <a href="../../faq.html#running_entries" class="sub-item-link">
+                Running entries
+              </a>
+            </div>
+
+            <div class="outfit-font">
+              <a href="../../faq.html#help" class="sub-item-link">
+                How to help
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+
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+            About
+          </span>
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+              </a>
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+
+            <div class="outfit-font">
+              <a href="../../judges.html" class="sub-item-link">
+                The judges
+              </a>
+            </div>
+
+	    <div class="outfit-font">
+              <a href="../../thanks-for-help.html" class="sub-item-link">
+                Thanks for the help
+              </a>
+            </div>
+
+            <div class="outfit-font">
+              <a href="../../contact.html" class="sub-item-link">
+                Contact us
+              </a>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+  </nav>
+
+  <div class="header-mobile-menu">
+    <noscript>
+      <a href="../../nojs-menu.html" class="topbar-js-label">
+        Please Enable JavaScript
+      </a>
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+        alt="hamburger style menu icon - open state"
+        width=48
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+      <img
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+              Location of authors
+            </a>
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+              Bugs and (mis)features
+            </a>
+
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+
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+
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+<!-- END: this line ends content from: inc/topbar.default.html -->
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+<div class="header">
+  <a href="../../2011/zucker/index.html">
+      <img src="../../png/ioccc.png"
+	   alt="IOCCC image by Matt Zucker"
+	   width=300
+	   height=110>
+  </a>
+  <h1>The International Obfuscated C Code Contest</h1>
+  <h2>2024/tompng - Prize in quasi bijection</h2>
+  <h3>vortex encryptor decryptor</h3>
+</div>
+
+<!-- END: this line ends content from: inc/header.default.html -->
+<!-- START: this line starts content from: inc/navbar.mid.html -->
+
+<div class="navbar">
+  <a class="Left" href="../tmarrec/index.html">&larr; 2024/tmarrec</a>
+  <a class="Left" href="../index.html">&uarr; 2024 &uarr;</a>
+  <a class="Left" href="../weaver/index.html">2024/weaver &rarr;</a>
+  <a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2024/tompng/prog.c">C code</a>
+  <a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2024/tompng/Makefile">Makefile</a>
+  <a class="Right" href="#inventory">Inventory</a>
+  <a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F2024%2Ftompng%2Findex.html">&#x2713;</a>
+</div>
+
+<!-- END: this line ends content from: inc/navbar.mid.html -->
+<!-- START: this line starts content from: inc/before-content.default.html -->
+
+    <div class="content" id="content">
+
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+<!-- START: this line starts content for HTML phase 20 by: bin/output-index-author.sh via bin/md2html.sh -->
+
+<!-- START: this line starts content generated by: bin/output-index-author.sh -->
+
+<h2 id="author">Author:</h2>
+<ul>
+<li>Name: <a href="../../authors.html#Tompng">tompng</a><br>
+Location: <a href="../../location.html#JP">JP</a> - <em>Japan</em></li>
+</ul>
+
+<!-- END: next line ends content generated by: bin/output-index-author.sh -->
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+<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
+
+<!-- BEFORE: 1st line of markdown file: 2024/tompng/README.md -->
+<h2 id="to-build">To build:</h2>
+<pre><code>    make all</code></pre>
+<h2 id="to-use">To use:</h2>
+<h3 id="encryption">Encryption</h3>
+<pre><code>    prog &lt; file.txt &gt; file.enc.txt</code></pre>
+<h3 id="decryption">Decryption</h3>
+<pre><code>    prog &lt; file.enc.txt &gt; file.txt</code></pre>
+<h3 id="command-line-arguments">Command line arguments</h3>
+<p>You can also specify SIZE of the text-stirring area and a PASSWORD.</p>
+<pre><code>    ./prog 30 &lt; input &gt; output
+    ./prog PASSWORD &lt; input &gt; output
+    ./prog 40 PASSWORD &lt; input &gt; output</code></pre>
+<p>You need to specify the same SIZE and PASSWORD to decrypt correctly.</p>
+<h2 id="try">Try:</h2>
+<pre><code>    ./try.sh</code></pre>
+<h2 id="judges-remarks">Judges’ remarks:</h2>
+<p>It is well-known that the Enigma cipher was broken due to the fact that a letter could never map to itself.
+Is this algorithm susceptible to a similar cryptanalysis?</p>
+<h2 id="authors-remarks">Author’s remarks:</h2>
+<h3 id="vortex-encryptordecryptor">Vortex Encryptor/Decryptor</h3>
+<p>Secure encryption/decryption is a black box. It’s highly based on difficult mathematics. We just blindly TRUST when using it.</p>
+<p>This entry is a visual vortex encryptor/decryptor for a text file.
+You can visually see how this program stirs the text to encrypt/decrypt. It’s not a black box at all.</p>
+<h3 id="easter-eggs">Easter Eggs</h3>
+<h4 id="random-encryptordecryptor">Random Encryptor/Decryptor</h4>
+<p>Some might dislike vortex-encryption algorithm. Alternately, there is one more visual text mixing algorithm.</p>
+<pre><code>    ./prog &lt; prog.c &gt; rand.c</code></pre>
+<p>This program <code>rand.c</code> is NOT A VORTEX encryptor/deryptor. You can see the text <code>N O /,T  ,A</code> somewhere in the code. It randomly swaps characters instead of stirring with vortex.</p>
+<p>To check the randomness, compile it as an executable <code>rand</code> and try <code>./rand &lt; prog.c</code> or <code>./rand &lt; rand.c</code>.
+You can find that the encrypted text claims to be really RAND/rand-om.</p>
+<h4 id="important-passwords">Important Passwords</h4>
+<p>“password” is the 1st most used alphabet password in the world. Wait, what’s the 0th used password? It might be “ioccc” or “IOCCC”.
+Let’s encrypt prog.c with these passwords.</p>
+<pre><code>    ./prog ioccc &lt; prog.c &gt; prog1.enc.c
+    ./prog IOCCC &lt; prog.c &gt; prog2.enc.c</code></pre>
+<p>Imagine if you accidentally hit your head hard, forgot the password, lost everything except prog executable and the encrypted prog.c file.
+There’s nothing to worry about. Just like important passwords often written on sticky notes, you can find this password in the encrypted text.</p>
+<h3 id="internal">Internal</h3>
+<h4 id="encryptiondecryption">Encryption/Decryption</h4>
+<p>This program internally have forward-text-stir and backward-text-stir operation.
+It tries both operation and select the one that makes the output have less entropy.
+This is why this program doesn’t need a command line argument such as <code>--encrypt</code> or <code>--decrypt</code>.</p>
+<h4 id="seed-and-hash">Seed and Hash</h4>
+<p>For security reason, vortex used to encrypt/decrypt varies over input text.
+Seed is calculated with vortex-stir-stable hash algorithm. This hash doesn’t change over encryption/decryption.
+This is making hard to embed easter eggs into this program.</p>
+<h4 id="vortex-stirring-algorithm">Vortex stirring algorithm</h4>
+<p>Character should not disappear by vortex stirring operation, so the velocity field of the vortex is required to be no divergence.
+Velocity field that has no divergence can be created from a <a href="https://en.wikipedia.org/wiki/Stream_function">stream function</a>.
+In this program, stream function which is a scalar field is made of horizontal, vertical and diagonal periodic waves.
+With a simple mathematics, this vortex stirring operation can be decomposed into horizontal, vertical, and diagonal array rotation which is a reversible operation.</p>
+<!--
+
+    Copyright © 1984-2025 by Landon Curt Noll and Leonid A. Broukhis.  All Rights Reserved.
+
+    You are free to share and adapt this file under the terms of this license:
+
+        Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+    For more information, see:
+
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+
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+<div id="inventory">
+<h1 id="inventory-for-2024tompng">Inventory for 2024/tompng</h1>
+</div>
+<h2 id="primary-files">Primary files</h2>
+<ul>
+<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/tompng/prog.c">prog.c</a> - entry source code</li>
+<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/tompng/Makefile">Makefile</a> - entry Makefile</li>
+<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/tompng/prog.orig.c">prog.orig.c</a> - original source code</li>
+<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/tompng/sample.txt">sample.txt</a> - sample IOCCC text</li>
+<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/tompng/try.sh">try.sh</a> - script to try entry</li>
+</ul>
+<h2 id="secondary-files">Secondary files</h2>
+<ul>
+<li><a href="2024_tompng.tar.bz2">2024_tompng.tar.bz2</a> - download entry tarball</li>
+<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/tompng/README.md">README.md</a> - markdown source for this web page</li>
+<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/tompng/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
+<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/tompng/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
+<li><a href=".path">.path</a> - directory path from top level directory</li>
+<li><a href="index.html">index.html</a> - this web page</li>
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+
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+
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+	   target="_blank"
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+	  <img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
+	       src="../../png/cc.png"
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+
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+	<p>
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+<!-- END: this line ends content from: inc/bottom.default.html -->

2024/tompng/prog.c

@@ -0,0 +1,57 @@
+
+
+
+                                     /* N/+
+                            + +   /  n /  /  /    +
+                        T/      +k  NXr        /    , /,
+                     /;  t  t/      nt /C   * l    %    d
+                  v     %   +i  =cS*Dc /=/1 /]+k    s o D   0+
+                + A    *;  =     ; / %#3:   i o    C   /OC X*)
+              +     C  ,    >      !3=(s 8  (      *   *     { ,/+
+            +  4t niN  !    o f  */long/*  / n / ** T    +C C 5  , a
+           +          %= * *   */long/*      */N,M,/*a1%(*-,    *   o
+          +(+/  io    5a(M  A */S,T,W/* */,X;char A[/*I      /[   ct 5
+         +k/    i  / /%c1[ds  */9999][9999]={0},B/*        i   d /    +
+        + / *v R*   d*/[/*o*/9999][9999];void Q/*   c     c2 N   W  [  +
+        ;       N;  */(int/**/t,int d){for(int i,j,k=~/*M        C /  o]
+       +  t , v     **/d/2*3+3,l;j=k!=2,k-(3+5*d)/2;k+=d)/*   i         +
+       + ,s / *IO aQ */{long long m=M*N,n=j?M:N,u=(2*k-k/2*3/*b c   S r +
+        / *=   }/     */-k/3*5)*d,x,y,w,s;for(i=m;i--;)B[i%N/**   c *ira
+      d*   / * ]!      */][i/N]=A[i%N][i/N];for(i=n;/* * *, =!n%   i  AA +
+      +D   ^    /-=+     */i--;){s=S+k;for(w=0,l=6;l-=2/*       ]c  ;C R +
+          * D,  c**/;s=(s+T)*W%X,x=l*i+s%W*n*t/W/5+n*(n+/* b /         *
+       +  dr+ =   */s%W)-n*t/10,w+=x%n*(n-x%n)*(x/n%2*2-1/*       I  C  +
+       +   ; ~t   / {*/)*(3+k%3+k/2));w=(w+n*n/(w>0?2:-2)/*0  (  /-A ),N+
+        ,  C=     =  * **/)/n/n;for(l=j?N:M;l--;x=   j*i+u/*/nC    M [A+
+         =*    %+  /      n    */*l+m*4,y=!j*i+d*j/***/*l/*  o/N=   /  +
+         ; N*  i    * C   D  */+m*4,A[y%N][x%M]=B/*rc  %i2/      d   v+
+          8    )ic i   b0 */[(y+d*j*w)/*N*/%N][(/*  /  3*- Anc ; c  Ng
+           + sv ok{  [[>=*/x+u*w)/**  T  */%M])/*  a *  +3 /   /    +
+            + i-d=    c o/       i     */;}}}/*    I o -} ] OA  /r i
+              /5  1/ d+ *g  c /+ a    ( ia2(]   *  O*    /d/ ;   0
+                +ck d  ,,o  vv a/      2+13 k   nd}   C  c     >
+                  / * o> b]  < a     %-       nr o / =    C/ +
+                     N Rn*     /   r     h  a          =  +
+                        + R   C O   O0c s +l*a  R     *v
+                            A;+I   *  N )  n *rW< +%
+                                     o+ +*/
+
+
+
+#include <stdio.h>
+#include <unistd.h>
+
+void      P(int   c){int i   =M*N;for(   ;i--;){A[i%N] [i/N]=(!(c= A[i%N   ][i/N
+])?32     :c);}  }int main(  int u,char  **v){char *s; int x=0,y=0 ,i,j,   n[256
+]={0}     ,a,b, c;W=33331;X= 33333331;N= 40;S=T=0;if(+ --u&&sscanf  (*++v ,"%l"
+"ld",&   N)){-- u;v++;};if(u )for(s=*v++ ;*s;)T=(T*W+* s++)%X;for(  ;(c=getchar
+ ())>=   0;n[c  ]++)c-10?A[y ][x++  ]=c:(    y++,x     =0);M         =2*N;P(0)
+ ;for(i =33;i<  127;i  ++)S= (3331  *S+n[    i])%W     ;for(i=c=0;    128>i;i
+  ++){x=-(6>>   i/32    )%2* 2+1;Q((96+i     *x+~-     x/2)%32,x);     for(j
+  =a=0;i%64==   31&&    j<N* M;b=A[j/M][     j%M]&     95,c+=x*(a|     !b&&(
+   j%M)),a=b    ,j=1+  j);}; for(x=0;32      >=x;x     ++){j=9999;    while(j
+   --){s=A[j    ];while(*s)s ++;while(*      --s==     32)*s         =0;}for(j
+    =x/32,a     =~-9999;~j;j --){;for(;a     &&!*A     [a];)a--;fprintf(stderr,
+    x?"%s":     "%s\033[2J", "\033" "[H")    ;for(     i=0;j?i<=a:  i<y|| i<N;i
+     ++)!j       ?!fprintf(  stderr  ,"%s\033[K\n"     ,A[i]):puts (A[i]   );}P(
+      0);         if(x-32)   c<0?Q    (31-x  ,-1):     Q(x,1);usleep(W<<   1);}}

2024/tompng/prog.orig.c

@@ -0,0 +1,57 @@
+
+
+
+                                     /* N/+
+                            + +   /  n /  /  /    +
+                        T/      +k  NXr        /    , /,
+                     /;  t  t/      nt /C   * l    %    d
+                  v     %   +i  =cS*Dc /=/1 /]+k    s o D   0+
+                + A    *;  =     ; / %#3:   i o    C   /OC X*)
+              +     C  ,    >      !3=(s 8  (      *   *     { ,/+
+            +  4t niN  !    o f  */long/*  / n / ** T    +C C 5  , a
+           +          %= * *   */long/*      */N,M,/*a1%(*-,    *   o
+          +(+/  io    5a(M  A */S,T,W/* */,X;char A[/*I      /[   ct 5
+         +k/    i  / /%c1[ds  */9999][9999]={0},B/*        i   d /    +
+        + / *v R*   d*/[/*o*/9999][9999];void Q/*   c     c2 N   W  [  +
+        ;       N;  */(int/**/t,int d){for(int i,j,k=~/*M        C /  o]
+       +  t , v     **/d/2*3+3,l;j=k!=2,k-(3+5*d)/2;k+=d)/*   i         +
+       + ,s / *IO aQ */{long long m=M*N,n=j?M:N,u=(2*k-k/2*3/*b c   S r +
+        / *=   }/     */-k/3*5)*d,x,y,w,s;for(i=m;i--;)B[i%N/**   c *ira
+      d*   / * ]!      */][i/N]=A[i%N][i/N];for(i=n;/* * *, =!n%   i  AA +
+      +D   ^    /-=+     */i--;){s=S+k;for(w=0,l=6;l-=2/*       ]c  ;C R +
+          * D,  c**/;s=(s+T)*W%X,x=l*i+s%W*n*t/W/5+n*(n+/* b /         *
+       +  dr+ =   */s%W)-n*t/10,w+=x%n*(n-x%n)*(x/n%2*2-1/*       I  C  +
+       +   ; ~t   / {*/)*(3+k%3+k/2));w=(w+n*n/(w>0?2:-2)/*0  (  /-A ),N+
+        ,  C=     =  * **/)/n/n;for(l=j?N:M;l--;x=   j*i+u/*/nC    M [A+
+         =*    %+  /      n    */*l+m*4,y=!j*i+d*j/***/*l/*  o/N=   /  +
+         ; N*  i    * C   D  */+m*4,A[y%N][x%M]=B/*rc  %i2/      d   v+
+          8    )ic i   b0 */[(y+d*j*w)/*N*/%N][(/*  /  3*- Anc ; c  Ng
+           + sv ok{  [[>=*/x+u*w)/**  T  */%M])/*  a *  +3 /   /    +
+            + i-d=    c o/       i     */;}}}/*    I o -} ] OA  /r i
+              /5  1/ d+ *g  c /+ a    ( ia2(]   *  O*    /d/ ;   0
+                +ck d  ,,o  vv a/      2+13 k   nd}   C  c     >
+                  / * o> b]  < a     %-       nr o / =    C/ +
+                     N Rn*     /   r     h  a          =  +
+                        + R   C O   O0c s +l*a  R     *v
+                            A;+I   *  N )  n *rW< +%
+                                     o+ +*/
+
+
+
+#include <stdio.h>
+#include <unistd.h>
+
+void      P(int   c){int i   =M*N;for(   ;i--;){A[i%N] [i/N]=(!(c= A[i%N   ][i/N
+])?32     :c);}  }int main(  int u,char  **v){char *s; int x=0,y=0 ,i,j,   n[256
+]={0}     ,a,b, c;W=33331;X= 33333331;N= 40;S=T=0;if(+ --u&&sscanf  (*++v ,"%l"
+"ld",&   N)){-- u;v++;};if(u )for(s=*v++ ;*s;)T=(T*W+* s++)%X;for(  ;(c=getchar
+ ())>=   0;n[c  ]++)c-10?A[y ][x++  ]=c:(    y++,x     =0);M         =2*N;P(0)
+ ;for(i =33;i<  127;i  ++)S= (3331  *S+n[    i])%W     ;for(i=c=0;    128>i;i
+  ++){x=-(6>>   i/32    )%2* 2+1;Q((96+i     *x+~-     x/2)%32,x);     for(j
+  =a=0;i%64==   31&&    j<N* M;b=A[j/M][     j%M]&     95,c+=x*(a|     !b&&(
+   j%M)),a=b    ,j=1+  j);}; for(x=0;32      >=x;x     ++){j=9999;    while(j
+   --){s=A[j    ];while(*s)s ++;while(*      --s==     32)*s         =0;}for(j
+    =x/32,a     =~-9999;~j;j --){;for(;a     &&!*A     [a];)a--;fprintf(stderr,
+    x?"%s":     "%s\033[2J", "\033" "[H")    ;for(     i=0;j?i<=a:  i<y|| i<N;i
+     ++)!j       ?!fprintf(  stderr  ,"%s\033[K\n"     ,A[i]):puts (A[i]   );}P(
+      0);         if(x-32)   c<0?Q    (31-x  ,-1):     Q(x,1);usleep(W<<   1);}}

2024/tompng/sample.txt

@@ -0,0 +1,17 @@
+       -----------------------------------------------------------------
+     ----------------------------------------------------------------------
+    --SAMPLESA----MPLESAMP-------LESAMPLE--------SAMPLES--------AMPLESA-----
+    --MPLESAMP--LESAMPLESAMP---LESAMPLESAMP---LESAMPLESAMP----LESAMPLESAM---
+    --PLESAMPL-ESAMPLESAMPLES-AMPLESAMPLESAM-PLESAMPLESAMPL--ESAMPLESAMPLE--
+    ----SAMP---LESAMP--LESAMP-LESAMP---LESAM-PLESAM---PLESA-MPLESA---MPLES--
+    ----AMPL---ESAMP----LESAM-PLESA----------MPLES----------AMPLE-----------
+    ----SAMP---LESAM----PLESA-MPLES----------AMPLE----------SAMPL-----------
+    ----ESAM---PLESA----MPLES-AMPLE----------SAMPL----------ESAMP-----------
+    ----LESA---MPLES----AMPLE-SAMPL----------ESAMP----------LESAM-----------
+    ----PLES---AMPLE----SAMPL-ESAMP----------LESAM----------PLESA-----------
+    ----MPLE---SAMPLE--SAMPLE-SAMPLE---SAMPL-ESAMPL---ESAMP-LESAMP---LESAM--
+    --PLESAMPL-ESAMPLESAMPLES-AMPLESAMPLESAM-PLESAMPLESAMPL-ESAMPLESAMPLES--
+    --AMPLESAM--PLESAMPLESAM---PLESAMPLESAM---PLESAMPLESAM---PLESAMPLESAM---
+    --PLESAMPL----ESAMPLES-------AMPLESAM-------PLESAMPL-------ESAMPLES-----
+     ----------------------------------------------------------------------
+       -----------------------------------------------------------------

2024/tompng/try.sh

@@ -0,0 +1,79 @@
+#!/usr/bin/env bash
+#
+# try.sh - demonstrate 2024/tompng
+
+# make sure CC is set so that when we do make CC="$CC" it isn't empty. Doing it
+# this way allows us to have the user specify a different compiler in an easy way.
+#
+if [[ -z "$CC" ]]; then
+    CC="cc"
+fi
+
+# make sure the program has been built
+#
+make CC="$CC" all >/dev/null || exit 1
+
+# clear the screen
+#
+clear
+
+
+read -r -n 1 -p "Press any key to view sample.txt: "
+echo 1>&2
+echo 1>&2
+cat sample.txt
+echo 1>&2
+
+echo "Encrypt sample input file"
+echo 1>&2
+echo "./prog < sample.txt > sample.enc.txt"
+echo 1>&2
+read -r -n 1 -p "Press any key to run: "
+echo 1>&2
+echo 1>&2
+./prog < sample.txt > sample.enc.txt
+echo 1>&2
+
+echo "Decrypt the previously encrypted file"
+echo 1>&2
+echo "./prog < sample.enc.txt"
+echo 1>&2
+read -r -n 1 -p "Press any key to run: "
+echo 1>&2
+echo 1>&2
+./prog < sample.enc.txt
+echo 1>&2
+
+read -r -n 1 -p "Press any key to view prog.c: "
+echo 1>&2
+echo 1>&2
+cat prog.c
+echo 1>&2
+
+echo "Encrypt the program itself"
+echo 1>&2
+echo "./prog < prog.c > prog2.c"
+echo 1>&2
+read -r -n 1 -p "Press any key to run: "
+echo 1>&2
+echo 1>&2
+./prog < prog.c > prog2.c
+echo 1>&2
+
+echo "Encrypt and decrypt sample input file with the encrypted program"
+echo 1>&2
+echo "cc prog2.c -o prog2 && ./prog2 < sample.txt | ./prog2"
+echo 1>&2
+read -r -n 1 -p "Press any key to run: "
+echo 1>&2
+echo 1>&2
+cc prog2.c -o prog2
+./prog2 < sample.txt | ./prog2
+echo 1>&2
+
+read -r -n 1 -p "Press any key to cleanup:"
+echo 1>&2
+echo 1>&2
+echo rm prog2.c prog2 sample.enc.txt
+rm prog2.c prog2 sample.enc.txt
+echo 1>&2