export class RC4 {
    public static rc4(data: string, key: string) {
        var seq: number[] = Array(256); //int
        var das = Array(data.length); //code of data
        var i = 0;
        var j = 0;
        for (var i = 0; i < 256; i++) {
            seq[i] = i;
            j = (j + seq[i] + key.charCodeAt(i % key.length)) % 256;
            var temp = seq[i];
            seq[i] = seq[j];
            seq[j] = temp;
        }
        for (var i = 0; i < data.length; i++) {
            das[i] = data.charCodeAt(i)
        }
        for (var x = 0; x < das.length; x++) {
            i = (i + 1) % 256;
            j = (j + seq[i]) % 256;
            var temp = seq[i];
            seq[i] = seq[j];
            seq[j] = temp;
            var k = (seq[i] + (seq[j] % 256)) % 256;
            das[x] = String.fromCharCode(das[x] ^ seq[k]);
        }
        return das.join('');
    }
}