Skip to content

Instantly share code, notes, and snippets.

@kkrypt0nn
Created Mar 28, 2022
Embed
What would you like to do?
Solution for challenge Magic Words at the Insomni'hack 2022 CTF
// This is copied code from the website
function beautify(input) {
let output = '';
for (let i = 0; i < input.length; i++) {
let pos = input.charCodeAt(i) + i;
if (pos > 'z'.charCodeAt(0)) {
pos = pos - 'z'.charCodeAt(0) + 'A'.charCodeAt(0);
}
output += String.fromCharCode(pos);
}
return output;
}
function uglify(input) {
let output = '';
let key = 'the_key';
for (let i = 0; i < input.length; i++) {
output += input[i] ^ key[i % key.length];
}
return btoa(output);
}
function digitalize(input) {
let output = '';
for (let i = 0; i < input.length; i++) {
output += input.charCodeAt(i).toString(16);
}
return output;
}
function mystifyCycle(x, k) {
var a = x[0],
b = x[1],
c = x[2],
d = x[3];
a = ff(a, b, c, d, k[0], 7, -680876936);
d = ff(d, a, b, c, k[1], 12, -389564586);
c = ff(c, d, a, b, k[2], 17, 606105819);
b = ff(b, c, d, a, k[3], 22, -1044525330);
a = ff(a, b, c, d, k[4], 7, -176418897);
d = ff(d, a, b, c, k[5], 12, 1200080426);
c = ff(c, d, a, b, k[6], 17, -1473231341);
b = ff(b, c, d, a, k[7], 22, -45705983);
a = ff(a, b, c, d, k[8], 7, 1770035416);
d = ff(d, a, b, c, k[9], 12, -1958414417);
c = ff(c, d, a, b, k[10], 17, -42063);
b = ff(b, c, d, a, k[11], 22, -1990404162);
a = ff(a, b, c, d, k[12], 7, 1804603682);
d = ff(d, a, b, c, k[13], 12, -40341101);
c = ff(c, d, a, b, k[14], 17, -1502002290);
b = ff(b, c, d, a, k[15], 22, 1236535329);
a = gg(a, b, c, d, k[1], 5, -165796510);
d = gg(d, a, b, c, k[6], 9, -1069501632);
c = gg(c, d, a, b, k[11], 14, 643717713);
b = gg(b, c, d, a, k[0], 20, -373897302);
a = gg(a, b, c, d, k[5], 5, -701558691);
d = gg(d, a, b, c, k[10], 9, 38016083);
c = gg(c, d, a, b, k[15], 14, -660478335);
b = gg(b, c, d, a, k[4], 20, -405537848);
a = gg(a, b, c, d, k[9], 5, 568446438);
d = gg(d, a, b, c, k[14], 9, -1019803690);
c = gg(c, d, a, b, k[3], 14, -187363961);
b = gg(b, c, d, a, k[8], 20, 1163531501);
a = gg(a, b, c, d, k[13], 5, -1444681467);
d = gg(d, a, b, c, k[2], 9, -51403784);
c = gg(c, d, a, b, k[7], 14, 1735328473);
b = gg(b, c, d, a, k[12], 20, -1926607734);
a = hh(a, b, c, d, k[5], 4, -378558);
d = hh(d, a, b, c, k[8], 11, -2022574463);
c = hh(c, d, a, b, k[11], 16, 1839030562);
b = hh(b, c, d, a, k[14], 23, -35309556);
a = hh(a, b, c, d, k[1], 4, -1530992060);
d = hh(d, a, b, c, k[4], 11, 1272893353);
c = hh(c, d, a, b, k[7], 16, -155497632);
b = hh(b, c, d, a, k[10], 23, -1094730640);
a = hh(a, b, c, d, k[13], 4, 681279174);
d = hh(d, a, b, c, k[0], 11, -358537222);
c = hh(c, d, a, b, k[3], 16, -722521979);
b = hh(b, c, d, a, k[6], 23, 76029189);
a = hh(a, b, c, d, k[9], 4, -640364487);
d = hh(d, a, b, c, k[12], 11, -421815835);
c = hh(c, d, a, b, k[15], 16, 530742520);
b = hh(b, c, d, a, k[2], 23, -995338651);
a = ii(a, b, c, d, k[0], 6, -198630844);
d = ii(d, a, b, c, k[7], 10, 1126891415);
c = ii(c, d, a, b, k[14], 15, -1416354905);
b = ii(b, c, d, a, k[5], 21, -57434055);
a = ii(a, b, c, d, k[12], 6, 1700485571);
d = ii(d, a, b, c, k[3], 10, -1894986606);
c = ii(c, d, a, b, k[10], 15, -1051523);
b = ii(b, c, d, a, k[1], 21, -2054922799);
a = ii(a, b, c, d, k[8], 6, 1873313359);
d = ii(d, a, b, c, k[15], 10, -30611744);
c = ii(c, d, a, b, k[6], 15, -1560198380);
b = ii(b, c, d, a, k[13], 21, 1309151649);
a = ii(a, b, c, d, k[4], 6, -145523070);
d = ii(d, a, b, c, k[11], 10, -1120210379);
c = ii(c, d, a, b, k[2], 15, 718787259);
b = ii(b, c, d, a, k[9], 21, -343485551);
x[0] = add32(a, x[0]);
x[1] = add32(b, x[1]);
x[2] = add32(c, x[2]);
x[3] = add32(d, x[3]);
}
function cmn(q, a, b, x, s, t) {
a = add32(add32(a, q), add32(x, t));
return add32((a << s) | (a >>> (32 - s)), b);
}
function ff(a, b, c, d, x, s, t) {
return cmn((b & c) | (~b & d), a, b, x, s, t);
}
function gg(a, b, c, d, x, s, t) {
return cmn((b & d) | (c & ~d), a, b, x, s, t);
}
function hh(a, b, c, d, x, s, t) {
return cmn(b ^ c ^ d, a, b, x, s, t);
}
function ii(a, b, c, d, x, s, t) {
return cmn(c ^ (b | ~d), a, b, x, s, t);
}
function mystify1(s) {
txt = '';
var n = s.length,
state = [1732584193, -271733879, -1732584194, 271733878],
i;
for (i = 64; i <= s.length; i += 64) {
mystifyCycle(state, mystifyBlk(s.substring(i - 64, i)));
}
s = s.substring(i - 64);
var tail = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
for (i = 0; i < s.length; i++) tail[i >> 2] |= s.charCodeAt(i) << (i % 4 << 3);
tail[i >> 2] |= 0x80 << (i % 4 << 3);
if (i > 55) {
mystifyCycle(state, tail);
for (i = 0; i < 16; i++) tail[i] = 0;
}
tail[14] = n * 8;
mystifyCycle(state, tail);
return state;
}
function mystifyBlk(s) {
/* I figured global was faster. */
var mystifyBlks = [],
i; /* Andy King said do it this way. */
for (i = 0; i < 64; i += 4) {
mystifyBlks[i >> 2] = s.charCodeAt(i) + (s.charCodeAt(i + 1) << 8) + (s.charCodeAt(i + 2) << 16) + (s.charCodeAt(i + 3) << 24);
}
return mystifyBlks;
}
var hex_chr = '0123456789abcdef'.split('');
function rhex(n) {
var s = '',
j = 0;
for (; j < 4; j++) s += hex_chr[(n >> (j * 8 + 4)) & 0x0f] + hex_chr[(n >> (j * 8)) & 0x0f];
return s;
}
function hex(x) {
for (var i = 0; i < x.length; i++) x[i] = rhex(x[i]);
return x.join('');
}
function mystify(s) {
return hex(mystify1(s));
}
function add32(a, b) {
return (a + b) & 0xffffffff;
}
// This is the needed code
p1 = 'Later, on my walk, I wondered why I felt I had to be suspicious of ‘normality’. The striking thing about the normal is that there is nothing normal about it: normality is the gentrification of ordinary madness – ask an Surrealist. In analysis ‘the normal child’ is often synonymous with the obedient good child, the one who only wants to please parents and develops what Winnicott called ‘a false self’';
p2 = 'In the hospital men’s room, as I’m washing my hands, I glance in the mirror. The man I see is not so much me as my father. When did he show up? There is no soap; I rub hand sanitizer into my face–it burns. I nearly drown myself in the sink trying to rinse it off.';
p3 = 'Your only chance of survival, if you are sincerely smitten, lies in hiding this fact from the woman you love, of feigning a casual detachment under all circumstances. What sadness there is in this simple observation! What an accusation against man! However, it had never occurred to me to contest this law, nor to imagine disobeying it: love makes you weak, and the weaker of the two is oppressed, tortured and finally killed by the other, who in his or her turn oppresses, tortures and kills without having evil intentions, without even getting pleasure from it, with complete indifference; that’s what men, normally, call love.';
p4 = 'Looking back on those incidents, he was always appalled by the memory of his passivity, hard though it was to see what else he could have done. He could have refused to pay for such gravy damage to his room, could have refused to change his shoes, could have refused to kneel to supplicate for his B.A.';
p5 = 'The way he went after that plump sister in the lace tucker, was an outrage on the credulity of human nature. Knocking down the fire-irons, tumbling over the chairs, bumping against the piano, smothering himself among the curtains, wherever she went, there went he. He always knew where the plump sister was. He wouldn’t catch anybody else. If you had fallen up against him (as some of them did), on purpose, he would have made a feint of endeavouring to seize you, which would have been an affront to your understanding, and would instantly have sidled off in the direction of the plump sister. She often cried out that it wasn’t fair; and it really was not.';
var response = '';
var words = p1.split(' ');
for (var i = 0; i < words.length; i += 1) {
if (words[i] == 'please') response += words[i];
}
var words = p2.split(' ');
for (var i = 0; i < words.length; i += 1) {
if (beautify(words[i]) == 'siqz') response += ' ' + words[i];
}
var words = p3.split(' ');
for (var i = 0; i < words.length; i += 1) {
if (uglify(words[i]) == 'MDA=') response += ' ' + words[i];
}
var words = p4.split(' ');
for (var i = 0; i < words.length; i += 1) {
if (digitalize(words[i]) == '746865') response += ' ' + words[i];
}
var words = p5.split(' ');
for (var i = 0; i < words.length; i += 1) {
if (mystify(words[i]) == 'c83b72dd001482ce10f0b106c7a0ed0e') response += ' ' + words[i];
}
console.log(response);
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment