JavaScript HEX encoding

hex.js

function toHex(s) {
    // utf8 to latin1
    var s = unescape(encodeURIComponent(s))
    var h = ''
    for (var i = 0; i < s.length; i++) {
        h += s.charCodeAt(i).toString(16)
    }
    return h
}

function fromHex(h) {
    var s = ''
    for (var i = 0; i < h.length; i+=2) {
        s += String.fromCharCode(parseInt(h.substr(i, 2), 16))
    }
    return decodeURIComponent(escape(s))
}