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1

Mircryption / Re: mircryption for NodeJS

« Last post by McDeffice on May 25, 2020, 02:54 PM »

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2

Mircryption / Re: mircryption for NodeJS

« Last post by McDeffice on April 04, 2020, 01:51 PM »

My test CBC MODE

[Select]

// Blowfish CBC code
const Blowfish = require('egoroof-blowfish');

const ircPrefix = "+OK *";
const IV = '00000000';

function generateIV() {
   const left = Math.random().toString(36).substring(2, 6);
   const right = Math.random().toString(36).substring(2, 6);
   return left + right;
}

function encode(str) {
  const textToEncode = generateIV() + str;
  const encodedString = Buffer.from(blowfish.encode(textToEncode)).toString('base64');
  return ircPrefix + encodedString;
}

function decode(str) {
  const cleanText = str.substring(ircPrefix.length)
  const data = Buffer.from(cleanText, 'base64');
  const decoded = blowfish.decode(data, Blowfish.TYPE.UINT8_ARRAY);
  const decrypt = Buffer.from(decoded).slice(8).toString('utf8');
  return decrypt;
}

var test_key = 'test123';
const blowfish = new Blowfish(test_key, Blowfish.MODE.CBC, Blowfish.PADDING.PKCS5);
blowfish.setIv(IV);

// Testing code

var test_text = 'test';
console.log('text: ' + test_text);
const encoded = encode(test_text);
console.log('encoded: ' + encoded);
console.log('decoded: ' + decode(encoded));

No one is interested in the topic? Any help is welcome ! tks

3

Mircryption / Re: mircryption for NodeJS

« Last post by McDeffice on March 31, 2020, 12:35 PM »

i would like to use to encrypt and decrypt IRC messages via an IRC bot in NodeJS. This message uses CBC or ECB blowfish mircryption using block and base64 encryption.

I find information here:

[Select]

Blowfish plugins for IRC seem to use the MODE_ECB (electronic code book), which is probably the least secure of the blowfish algorithms.

For encryption, they break the plaintext up into 8-byte chunks (the Blowfish ECB blocksize). They then encrypt each 8-byte block separately, and take the output of each encrypted block, and chunk that into (2) 4-byte longs, and base64encode each long, padding them to length of 6 base64 characters.

For decryption, this process is reversed, but because it's somewhat confusing I'll also describe that. Take 12 of the ciphertext bytes, decoding each 6-byte representation as a long ('>L'), so that you now have 8 bytes, which you then pass to the blowfish decryption algo.

Source : IRC blowfish encryption mode?
- Block_cipher_mode_of_operation
- Java Code example

what I found closest to javascript is here:
- javascript-blowfish package
- egoroof-blowfish package

tks!

EDIT :
The data transmitted by FiSH is not standard Base64. It uses a nonstandard encoding table which you'll have to account for.

4

Mircryption / mircryption for NodeJS

« Last post by McDeffice on March 28, 2020, 02:11 PM »

I would like to use mircryption with NodeJS, I did not find anything about it.

Can you help me with my quests? tks