function XOR_hex(a, b) {
    var res = '',
        i = a.length,
        j = b.length
    while (i-- > 0 && j-- > 0)
        res =
            (parseInt(a.charAt(i), 16) ^ parseInt(b.charAt(j), 16)).toString(
                16
            ) + res
    return res
}
function hexEncode(a) {
    let hex
    let result = ''
    for (let i = 0; i < a.length; i++) {
        hex = a.charCodeAt(i).toString(16)
        result += ('000' + hex).slice(-4)
    }
    return result
}
function xor(a, b) {
    return XOR_hex(hexEncode(a), hexEncode(b)).toString('hex')
}
export default xor