224 lines
8.1 KiB
JavaScript
224 lines
8.1 KiB
JavaScript
const CryptoJS = require('crypto-js');
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const rc4 = require('arc4');
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class WTVNetworkSecurity {
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initial_shared_key = null;
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current_shared_key = null;
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challenge_key = null;
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challenge_response = null;
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challenge_b64 = null;
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ticket_b64 = null;
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incarnation = 1;
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session_key1 = null;
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session_key2 = null;
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hRC4_Key1 = null;
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hRC4_Key2 = null;
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zdebug = false;
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constructor(wtv_initial_key = CryptoJS.lib.WordArray.random(8), wtv_incarnation = 1) {
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var initial_key = wtv_initial_key;
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this.zdebug = true;
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if (initial_key.sigBytes === 8) {
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this.incarnation = wtv_incarnation;
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this.initial_shared_key = initial_key;
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this.current_shared_key = initial_key;
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} else {
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throw ("Invalid initial key length");
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}
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}
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set_incarnation(wtv_incarnation) {
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this.incarnation = wtv_incarnation;
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}
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increment_incarnation() {
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this.incarnation = this.incarnation + 1;
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}
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PrepareTicket() {
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// store last challenge response in ticket
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var ticket_data = this.challenge_response;
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try {
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var ticket_data_enc = CryptoJS.DES.encrypt(ticket_data, this.current_shared_key, {
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mode: CryptoJS.mode.ECB,
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padding: CryptoJS.pad.NoPadding
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});
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this.ticket_b64 = this.current_shared_key.concat(ticket_data_enc.ciphertext.toString(CryptoJS.enc.Base64));
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} catch (e) {
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console.log("Error encrypting ticket: " + e.toString());
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return null;
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}
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}
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DecodeTicket(ticket_b64) {
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var ticket_hex = CryptoJS.enc.Base64.parse(ticket_b64);
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var ticket_key = CryptoJS.enc.Hex.parse(ticket_hex.substring(0, this.current_shared_key.sigBytes));
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var ticket_dec = CryptoJS.DES.decrypt(
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{
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ciphertext: challenge_enc
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},
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ticket_key,
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{
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mode: CryptoJS.mode.ECB,
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padding: CryptoJS.pad.ZeroPadding
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}
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);
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this.ProcessChallenge(ticket_dec);
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}
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ProcessChallenge(wtv_challenge) {
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var challenge_raw = CryptoJS.enc.Base64.parse(wtv_challenge);
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if (challenge_raw.sigBytes > 8) {
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var challenge_raw_hex = challenge_raw.toString(CryptoJS.enc.Hex);
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var challenge_enc_hex = challenge_raw_hex.substring((8*2));
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var challenge_enc = CryptoJS.enc.Hex.parse(challenge_enc_hex);
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var challenge_decrypted = CryptoJS.DES.decrypt(
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{
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ciphertext: challenge_enc
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},
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this.current_shared_key,
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{
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mode: CryptoJS.mode.ECB,
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padding: CryptoJS.pad.ZeroPadding
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}
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);
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var challenge_dec_hex = challenge_decrypted.toString(CryptoJS.enc.Hex);
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var challenge_md5_challenge = CryptoJS.MD5(CryptoJS.enc.Hex.parse(challenge_dec_hex.substring(0, (80 * 2))));
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if (challenge_dec_hex.substring((80 * 2), (96 * 2)) == challenge_md5_challenge.toString(CryptoJS.enc.Hex)) {
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this.current_shared_key = CryptoJS.enc.Hex.parse(challenge_dec_hex.substring((72*2), (80*2)));
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var challenge_echo = CryptoJS.enc.Hex.parse(challenge_dec_hex.substr(0, (40*2)));
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// RC4 encryption keys.Stored in the wtv-ticket on the server side.
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this.session_key1 = CryptoJS.enc.Hex.parse(challenge_dec_hex.substring((40*2), (56*2)));
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this.session_key2 = CryptoJS.enc.Hex.parse(challenge_dec_hex.substring((56*2), (72*2)));
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var echo_encrypted = CryptoJS.DES.encrypt(CryptoJS.MD5(challenge_echo).concat(challenge_echo), this.current_shared_key, {
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mode: CryptoJS.mode.ECB,
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padding: CryptoJS.pad.NoPadding
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});
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// Last bytes is just extra padding
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var challenge_response = CryptoJS.enc.Hex.parse(challenge_raw_hex.substr(0, (8 * 2))).concat(echo_encrypted.ciphertext.concat(CryptoJS.enc.Utf8.parse("\x00".repeat(8))));
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return challenge_response;
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} else {
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throw ("Couldn't solve challenge");
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return "";
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}
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} else {
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throw ("Invalid challenge length");
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}
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}
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IssueChallenge() {
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/*
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* bytes 0-8: Random id? Just echoed in the response
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* bytes 8 - XX: DES encrypted block.Encrypted with the initial key or subsequent keys from the challenge.
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* bytes 8 - 48: hidden random data we echo back in the response
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* bytes 48 - 64: session key 1 used in RC4 encryption triggered by SECURE ON
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* bytes 64 - 80: session key 2 used in RC4 encryption triggered by SECURE ON
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* bytes 80 - 88: new key for future challenges
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* bytes 88 - 104: MD5 of 8 - 88
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* bytes 104 - 112: padding.not important
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*/
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var random_id_question_mark = CryptoJS.lib.WordArray.random(8);
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var echo_me = CryptoJS.lib.WordArray.random(40);
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this.session_key1 = CryptoJS.lib.WordArray.random(16);
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this.session_key2 = CryptoJS.lib.WordArray.random(16);
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var new_shared_key = CryptoJS.lib.WordArray.random(8);
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var challenge_puzzle = echo_me.concat(this.session_key1.concat(this.session_key2.concat(new_shared_key)));
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var challenge_secret = challenge_puzzle.concat(CryptoJS.MD5(challenge_puzzle).concat(CryptoJS.enc.Hex.parse("\x00".repeat(8))));
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// Shhhh!!
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var challenge_secreted = CryptoJS.DES.encrypt(challenge_secret, this.current_shared_key, {
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mode: CryptoJS.mode.ECB,
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padding: CryptoJS.pad.NoPadding
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});
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var challenge = random_id_question_mark.concat(challenge_secreted.ciphertext);
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var challenge_b64 = challenge.toString(CryptoJS.enc.Base64);
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// get the expected response for when client sends it
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this.challenge_response = this.ProcessChallenge(challenge_b64);
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this.challenge_key = this.current_shared_key;
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this.challenge_b64 = challenge_b64;
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this.current_shared_key = new_shared_key;
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return challenge_b64;
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}
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SecureOn() {
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var buf = Buffer.allocUnsafe(4);
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buf.writeUIntLE(this.incarnation, 0, 4);
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var bigbuf = buf.readUIntBE(0, 4);
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var md5_digest_key1 = CryptoJS.MD5(this.session_key1.concat(CryptoJS.lib.WordArray.create(bigbuf).concat(this.session_key1)));
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buf = Buffer.allocUnsafe(4);
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buf.writeUIntLE(this.incarnation, 0, 4);
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bigbuf = buf.readUIntBE(0, 4);
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var md5_digest_key2 = CryptoJS.MD5(this.session_key2.concat(CryptoJS.lib.WordArray.create(bigbuf).concat(this.session_key2)));
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this.hRC4_Key1 = md5_digest_key1;
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this.hRC4_Key2 = md5_digest_key2;
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}
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EncryptKey1(data) {
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return this.Encrypt(this.hRC4_Key1, data);
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}
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EncryptKey2(data) {
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return this.Encrypt(this.hRC4_Key2, data);
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}
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Encrypt(context, data) {
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if (key != null) {
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return CryptoJS.RC4.encrypt(data, key);
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} else {
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throw ("Invalid RC4 encryption key");
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}
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}
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DecryptKey1(data) {
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return this.Decrypt(this.hRC4_Key1, data);
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}
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DecryptKey2(data) {
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return this.Decrypt(this.hRC4_Key2, data);
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}
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Decrypt(key, data) {
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if (key != null) {
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return CryptoJS.RC4.decrypt(data, key);
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} else {
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throw ("Invalid RC4 encryption key");
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}
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}
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Test() {
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console.log("TEST RUN");
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console.log("Test python challenge");
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this.current_shared_key = CryptoJS.enc.Base64.parse("CC5rWmRUE0o=");
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var current_challenge = "0kjyqIYAu0ziFBbSERN6DGaZ6S0fT+DBUCtpHCJ4lpuM7CbXdAm+x83BIDoJYztd1Z+5KFZ7ghmb3LJCT/6mhWUYkqqKOyfPRW8ZIdbICK/CV+Kxm8EUjRXZSk/97tsmFpH3hcCJ7C2TBw+TX38uQQ==";
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var expected_result = "0kjyqIYAu0zI5QrLhSuEUFgKkoVSxI3zBlUMfhnIYoMy0ExfIX4s/mHvILseDFx+17trk7YO+xG9D2qSY6v9XVUS1OP1m8ee";
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console.log("Expected: " + expected_result);
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console.log("Got: " + this.ProcessChallenge(current_challenge));
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}
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}
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module.exports = WTVNetworkSecurity; |