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July 18, 2023 06:15
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"Drunk Bishop" RandomArt algorithm (from SSH), implemented as Javascript. Only demo code here, but can be trivially changed to give some return value to do something with the randomart.
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<!-- I was recently asked what license this code is under. Since it is fairly trivial code, | |
I don't really feel it "deserves" a "real" license, so I am hereby placing it in the public domain. | |
In countries where this is not posible, I am placing it under Creative Commons CC0 | |
(https://creativecommons.org/publicdomain/zero/1.0/), which is basically just a more formal way of | |
putting it in the public domain for people who like to be sure. | |
If you want to credit me anyway, that is of course fine with me :) --> | |
<html> | |
<body> | |
<div id="renderDiv" style='font-family:"Lucida Console", Monaco, monospace' /> | |
<script type="text/javascript"> | |
// ENTER YOUR FINGERPRINT HERE | |
var fp = "d4:d3:fd:ca:c4:d3:e9:94:97:cc:52:21:3b:e4:ba:e9"; | |
//Useful Functions | |
function checkHex(n){return/^[0-9A-Fa-f]{1,64}$/.test(n)} | |
function pad(s,z){s=""+s;return s.length<z?pad("0"+s,z):s} | |
//Hexadecimal Operations | |
function Hex2Bin(n){if(!checkHex(n))return 0;return parseInt(n,16).toString(2)} | |
function reverse(s) { | |
return s.split("").reverse().join(""); | |
} | |
function isValidMove(x, y) { | |
return (0 <= x && x <= 16 && 0 <= y && y <= 8); | |
} | |
var map = [ | |
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], | |
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], | |
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], | |
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], | |
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], | |
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], | |
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], | |
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], | |
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] | |
]; | |
var x = 8; | |
var y = 4; | |
var arr = fp.split(":"); // Split fingerprint into 8-bit words | |
for (var i = 0; i < 16; i++) { // Iterate through words | |
var bin = reverse(pad(Hex2Bin(arr[i]), 8)); // Convert to binary | |
for (var c = 0; c < 8; c = c + 2) { // Iterate through the bit-pairs in the words | |
var move = reverse(bin.substring(c, c + 2)); // determine the move | |
switch (move) { | |
case "00": | |
if (isValidMove(x - 1, y - 1)) { | |
x--; | |
y--; | |
} else if (isValidMove(x - 1, y)) { | |
x--; | |
} else if (isValidMove(x, y - 1)) { | |
y--; | |
} | |
break; | |
case "01": | |
if (isValidMove(x + 1, y - 1)) { | |
x++; | |
y--; | |
} else if (isValidMove(x + 1, y)) { | |
x++; | |
} else if (isValidMove(x, y - 1)) { | |
y--; | |
} | |
break; | |
case "10": | |
if (isValidMove(x - 1, y + 1)) { | |
x--; | |
y++; | |
} else if (isValidMove(x - 1, y)) { | |
x--; | |
} else if (isValidMove(x, y + 1)) { | |
y++; | |
} | |
break; | |
case "11": | |
if (isValidMove(x + 1, y + 1)) { | |
x++; | |
y++; | |
} else if (isValidMove(x + 1, y)) { | |
x++; | |
} else if (isValidMove(x, y + 1)) { | |
y++; | |
} | |
break; | |
default: | |
alert("WTF!"); | |
} | |
map[y][x]++; // increment the value at the new position | |
} | |
} | |
map[y][x] = -1; // Set end position | |
map[4][8] = 255; // Re-set start position | |
// The following will render the visual fingerprint | |
var div = document.getElementById('renderDiv'); | |
div.innerHTML = "+--[ RSA 2048]----+<br>"; | |
for (var i = 0; i <= 8; i++) { | |
div.innerHTML = div.innerHTML + "|"; | |
for (var j = 0; j <= 16; j++) { | |
var char = " "; | |
switch (map[i][j]) { | |
case 1: | |
char = "."; | |
break; | |
case 2: | |
char = "o"; | |
break; | |
case 3: | |
char = "+"; | |
break; | |
case 4: | |
char = "="; | |
break; | |
case 5: | |
char = "*"; | |
break; | |
case 6: | |
char = "B"; | |
break; | |
case 7: | |
char = "O"; | |
break; | |
case 8: | |
char = "X"; | |
break; | |
case 9: | |
char = "@"; | |
break; | |
case 10: | |
char = "%"; | |
break; | |
case 11: | |
char = "&"; | |
break; | |
case 12: | |
char = "#"; | |
break; | |
case 13: | |
char = "/"; | |
break; | |
case 14: | |
char = "^"; | |
break; | |
case 255: | |
char = "S"; | |
break; | |
case -1: | |
char = "E"; | |
break; | |
default: | |
char = " "; | |
} | |
div.innerHTML = div.innerHTML + char; | |
} | |
div.innerHTML = div.innerHTML + "|<br>"; | |
} | |
div.innerHTML = div.innerHTML + "+-----------------+"; | |
</script> | |
</body> | |
</html> |
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