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logDecrypter.html
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logDecrypter.html
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<!DOCTYPE html>
<html>
<head>
<title>Log decrypter</title>
<meta charset="UTF-8"/>
</head>
<body>
<textarea id="secretKey" style="width: 80vw; height: 30vh;">Enter the secret key here</textarea>
<div id="controls" style="position: absolute; right: 10px; top: 10px; content-align: right;">
<button id="parse">Parse</button>
<br/>
<button id="getLogs">Get Logs</button>
<br/>
</div>
<div id="status" style="position: absolute; right: 10px; top: 80px; content-align: right;">
Enter secret key, press "parse".
</div>
<script type="text/javascript" src="jquery-1.11.1.min.js"></script>
<script type="text/javascript" src="forge.min.js"></script>
<script type="text/javascript" src="firebase.js"></script>
<script type="text/javascript" src="BigInt.js"></script>
<script type="text/javascript">
var rsa = (function() {
var p, q, n, e, d, keypair;
//The keypair will be aquired when the parse happens
function decrypt(c) {
return powMod(c, d, n);
}
function encrypt(m, publicKey) {
return powMod(m, publicKey.e, publicKey.n);
}
function encryptStr(str, publicKey) {
//TODO: Pad with randomness
if(str.length > n.length) {
//m must not be greater than n; throw an exception
throw "str.length > n.length; m must never be greater than n.";
}
var bigInt = [str.length];
for(var i = 0; i < str.length; i++) {
bigInt[i] = str.charCodeAt(i);
}
return encrypt(bigInt, publicKey);
}
function decryptStr(c1) {
var c = decrypt(c1);
var str = "";
for(var i = 0; i < c.length - 1; i++) { //-1 because for some reason a random character is appended to the end; TODO: make this not a hack :(
str += String.fromCharCode(c[i]);
}
return str;
}
function encryptAESKey(aesKey, publicKey) {
return {
key: encryptStr(aesKey.key, publicKey),
iv: encryptStr(aesKey.iv, publicKey)
};
}
function decryptAESKey(encrypted) {
return {
key: decryptStr(encrypted.key),
iv: decryptStr(encrypted.iv)
};
}
function unstringifyPublicKey(key) {
if(typeof(key.e) !== "string" || typeof(key.n) !== "string") {
// console.warn("Called unstringifyPublicKey on unstringified public key:", key, "with type", typeof(key.e));
return key;
}
return {
e: str2bigInt(key.e, 10, 17, 2),
n: str2bigInt(key.n, 10, 512, 34)
}
}
function dealWithNewKeypair(kp) {
rsa.keypair = kp;
keypair = kp;
p = keypair.p;
q = keypair.q;
n = keypair.n;
e = keypair.e;
d = keypair.d;
rsa.p = keypair.p;
rsa.q = keypair.q;
rsa.n = keypair.n;
rsa.e = keypair.e;
rsa.d = keypair.d;
}
return {
decrypt: decrypt,
encrypt: encrypt,
encryptStr: encryptStr,
decryptStr: decryptStr,
encryptAESKey: encryptAESKey,
decryptAESKey: decryptAESKey,
unstringifyPublicKey: unstringifyPublicKey,
p: p,
q: q,
n: n,
e: e,
d: d,
keypair: keypair,
dealWithNewKeypair: dealWithNewKeypair
};
})();
//////////////////////////////////////////////////////////////////////////////////////////////
var aes = (function() {
function getKey() {
var key = forge.random.getBytesSync(32);
var iv = forge.random.getBytesSync(32);
return {
key: key,
iv: iv
};
}
function getKeyFromPassphrase(passphrase) {
//The iv is the passphrase reversed.
//Everything is quadruple-sha256'd so the keys are the right length and to protect against brute-force.
return {
key: hash.sha256.multiple(passphrase, 4).data,
iv: hash.sha256.multiple(passphrase.split("").reverse().join(), 4).data
}
}
function encrypt(msgIn, key) {
//Certain types of cryptanalysis rely on the first blocks being predictable.
//So, begin with 128 bytes of randomness.
var msg = msgIn;
var cipher = forge.cipher.createCipher("AES-CBC", key.key);
cipher.start({
iv: key.iv
});
cipher.update(forge.util.createBuffer(msg, "utf8"));
cipher.finish();
return cipher.output;
}
function encryptKeypair(keypair, key) {
return {
p: encrypt(JSON.stringify(keypair.p), key),
q: encrypt(JSON.stringify(keypair.q), key),
n: encrypt(JSON.stringify(keypair.n), key),
e: encrypt(JSON.stringify(keypair.e), key),
d: encrypt(JSON.stringify(keypair.d), key)
};
}
function decryptKeypair(encrypted, key) {
return {
p: JSON.parse(decrypt(encrypted.p, key)),
q: JSON.parse(decrypt(encrypted.q, key)),
n: JSON.parse(decrypt(encrypted.n, key)),
e: JSON.parse(decrypt(encrypted.e, key)),
d: JSON.parse(decrypt(encrypted.d, key)),
};
}
function decrypt(msg, key) {
var decipher = forge.cipher.createDecipher("AES-CBC", key.key);
decipher.start({
iv: key.iv
});
var buffer = forge.util.createBuffer(msg.data, "utf8");
buffer.data = msg.data;
decipher.update(buffer);
decipher.finish();
//.substr(128) to remove the 128 bits of padding (to prevent certain cryptanalyses).
return decipher.output.data;
}
return {
encrypt: encrypt,
decrypt: decrypt,
getKey: getKey,
getPasswordKey: getKeyFromPassphrase,
encryptKeypair: encryptKeypair,
decryptKeypair: decryptKeypair
};
})();
///////////////////////////////////////////////////////////////////////////////////////////////
var hash = {
createHasher: function(hashFunc) {
function hash(str) {
var md = hashFunc.create();
md.update(str);
return md.digest();
}
function hexHash(str) {
return hash(str).toHex();
}
function multiple(str, iterations) {
if(iterations <= 1) {
return hash(str);
}
return multiple(hash(str).data, iterations - 1);
}
function hexMultiple(str, iterations) {
return multiple(str, iterations).toHex();
}
return {
hash: hash,
hexHash: hexHash,
multiple: multiple,
hexMultiple: hexMultiple
};
},
sha1: "This is populated directly below.",
sha256: "This will be populated directly below.",
sha384: "This will be populated directly below.",
sha512: "This will be populated directly below.",
md5: "This will be populated directly below.",
};
hash.sha1 = hash.createHasher(forge.md.sha1);
hash.sha256 = hash.createHasher(forge.md.sha256);
hash.sha384 = hash.createHasher(forge.md.sha384);
hash.sha512 = hash.createHasher(forge.md.sha512);
hash.md5 = hash.createHasher(forge.md.md5);
function sha1(msg) {
return hash.sha1.hexHash(msg);
}
///////////////////////////////////////////////////////////////////////////
var firebase = new Firebase("https://cedi.firebaseio.com/");
$("#parse").on("click", function() {
rsa.dealWithNewKeypair(JSON.parse($("#secretKey")[0].value));
$("#status").html("Click 'Get Logs' to get logs.");
});
var decryptedKeys = {};
$("#getLogs").on("click", function() {
$("#status").html("Downloading...");
firebase.child("logs").once("value", function(snapshot) {
var val = snapshot.val();
$("#status").html("Decrypting titles...");
for(var key in val) {
var log = val[key];
var encryptedComment = forge.util.createBuffer();
encryptedComment.data = log["comment"];
var encryptedKey = log["key"];
var decryptedKey = rsa.decryptAESKey(encryptedKey);
decryptedKeys[key] = decryptedKey;
console.log(aes.decrypt(encryptedComment, decryptedKey));
}
$("#status").html("Done!");
});
});
</script>
</body>
</html>