@cryptoolsorg/bitshiftcipher/js/encrypt.js

A homemade encryption solution

/* ==========================================================================
 *
 *  Use:
 *  "Hello World!".encrypt("key")
 *  => "WzM3NDQyLDUyNDg4LDU1ODc0LDU2MDcyLDU3NDEwLDE3MTYwLDQ1MTIyLDU3NjA4LDU4OTQ2LDU2MDcyLDUxNzc4XQ=="
 *
 * ========================================================================== */

String.prototype.encode = function() {
    let array = [];
    for (let i of this) {
        array.push(i.charCodeAt(0))
    }
    return array
}
String.prototype.encrypt = function(key) {
    const encoded = this.encode();
    const keyEncoded = key.encode();
    // console.log(keyEncoded)
    let array = encoded.map(x => {
        x = parseInt(x)
        for (let i of keyEncoded) {
            x = x + 1 << i % 8
        }
        keyEncoded.reverse()
        return x;
    })
    if (typeof btoa === 'undefined') {
        global.btoa = str => new Buffer(str, 'binary').toString('base64');
    }
    return btoa(JSON.stringify(array))
}

module.exports = (text, key) => text.encrypt(key)