AES-Bruteforce-Last-Bit.html

<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/rollups/sha256.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/rollups/aes.js"></script>
<script>

function hex2a(hex) {
	var str = '';
	for (var i = 0; i < hex.length; i += 2)
			str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
	return str;
}

for (var i=0; i < 256;i++) {

	var data = "PKhuCrfh3RUw4vie3OMa8z4kcww1i7198ly0Q4rpuyA=";
	var k = CryptoJS.SHA256("\x93\x39\x02\x49\x83\x02\x82\xf3\x23\xf8\xd3\x13"+String.fromCharCode(i));

	var key = k.toString().substr(0,32);
	var iv = k.toString().substr(32,64);

	var plaintextArray = CryptoJS.AES.decrypt(
		{
			ciphertext: CryptoJS.enc.Base64.parse(data),
			salt: ""
		},
		CryptoJS.enc.Hex.parse(key),
		{ iv: CryptoJS.enc.Hex.parse(iv) }
	);
	var result = hex2a(plaintextArray.toString());
	if (result.includes("FLG")) {
		console.log("Result found!\n"+result);
		break
	} else {
		console.log(result);
	}

}
</script>