react-native-aes-ecb/decryptor.js

A pure JavaScript implementation of the AES block cipher algorithm with additional features for react-native.

const aesjs = require('aes-js');
import { Buffer } from 'buffer';

module.exports = function decryptor (keyString, input, s) {
    const key = keyString.trim();
    let data;
   
    if (s) {
        const _s = s.trim();
        data = input.split(_s)[1].trim();
    } else {
        data = input.trim();
    }
    const keyBuffer = aesjs.utils.utf8.toBytes(key);
    const escEcb = new aesjs.ModeOfOperation.ecb(keyBuffer);
    const buf = Buffer.from(data, 'base64');
    const decryptedBytes = escEcb.decrypt(buf);
    const decryptedText = aesjs.utils.utf8.fromBytes(decryptedBytes);

    const regex = /[\u{0001}-\u{0010}]/gu ;

    const result = regex.test(decryptedText) ? decryptedText.replace(/[\u{0001}-\u{0010}]/gu, "") : decryptedText;
    return result.trim();
};