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const forge = require('node-forge');
const pako = require('pako');
function initCipher(session, keyModulus, keyExponent)
{
session.aesIV = generateIV();
session.publicKey = forge.pki.rsa.setPublicKey(
new forge.jsbn.BigInteger(keyModulus, 16),
new forge.jsbn.BigInteger(keyExponent, 16)
);
}
function cipher(session, data, { key, compress, disableIV } = {})
{
data = forge.util.encodeUtf8('' + data);
if (compress && !session.disableCompress) {
data = deflate(data);
}
const cipher = createCipher(session, key, false, disableIV);
cipher.update(new forge.util.ByteBuffer(data));
return cipher.finish() && cipher.output.toHex();
}
function decipher(session, data, { compress, scrambled, key, asBytes } = {})
{
const cipher = createCipher(session, key, true);
cipher.update(new forge.util.ByteBuffer(forge.util.hexToBytes(data)));
let result = cipher.finish() && cipher.output.bytes();
if (compress && !session.disableCompress) {
result = inflate(result);
}
result = forge.util.decodeUtf8(result);
if (scrambled) {
const unscrambled = new Array(result.length);
for (let i = 0; i < result.length; i += 1) {
if (i % 2 === 0) {
unscrambled.push(result.charAt(i));
}
}
return unscrambled.join('');
}
if (asBytes) {
const buffer = new forge.util.ByteBuffer();
const split = result.split(',');
for (let i = 0; i < split.length; i++) {
buffer.putInt(parseInt(split[i]));
}
return buffer;
}
return result;
}
function createCipher(session, key, decipher, disableIV = false)
{
if (!key) {
key = session.aesKey || new forge.util.ByteBuffer();
}
const cipher = forge.cipher[decipher ? 'createDecipher' : 'createCipher']('AES-CBC', md5(key));
const iv = disableIV ? new forge.util.ByteBuffer() : md5(session.aesIV);
cipher.start({ iv });
return cipher;
}
function md5(buffer)
{
return forge.md.md5.create().update(buffer.bytes()).digest();
}
function deflate(data)
{
return pako.deflateRaw(new forge.util.ByteBuffer(data).toHex(), { level: 6, to: 'string' });
}
function inflate(data)
{
return pako.inflateRaw(data, { to: 'string' });
}
function generateIV()
{
return new forge.util.ByteBuffer(forge.random.generate(16));
}
function getUUID(session, iv)
{
return forge.util.encode64(session.publicKey.encrypt(iv.bytes()), 64);
}
function getLoginKey(username, password, scramble, fromCas)
{
const hash = forge.md.sha256.create().update(scramble || '').update(forge.util.encodeUtf8(password)).digest();
const key = (fromCas ? '' : username.toLowerCase()) + hash.toHex().toUpperCase();
return new forge.util.ByteBuffer(forge.util.encodeUtf8(key));
}
module.exports = {
initCipher,
cipher,
decipher,
getUUID,
getLoginKey
};
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