RC4 Symmetric Encryption/Decryption

http://0061276.netsolhost.com/tony/rc4doc.html

/* JQuery RC4 encryption/decryption
 * Copyright (c) 2009 by Tony Simek.
 * released under the terms of the Gnu Public License.
 * Email: tony.simek@gmail.com
 */ (function ($) {
    $.fn.rc4 = function (settings) {
        var defaults = {
            key: null,
            method: "encrypt",
            callback: null
        };
        var options = $.extend(defaults, settings);
        if ($.fn.rc4.ctrlrInst == null) {
            $.fn.rc4.ctrlrInst = new $.fn.rc4.ctrlr(options);
        }
        return this.each(function () {
            $.fn.rc4.ctrlrInst.settings = options;
            $.fn.rc4.ctrlrInst.container = this;
            $.fn.rc4.ctrlrInst.initialise(this);
        });
    }
    $.extend({
        hexEncode: function (data) {
            var b16D = '0123456789abcdef';
            var b16M = new Array();
            for (var i = 0; i < 256; i++) {
                b16M[i] = b16D.charAt(i >> 4) + b16D.charAt(i & 15);
            }
            var result = new Array();
            for (var i = 0; i < data.length; i++) {
                result[i] = b16M[data.charCodeAt(i)];
            }
            return result.join('');
        },
        hexDecode: function (data) {
            var b16D = '0123456789abcdef';
            var b16M = new Array();
            for (var i = 0; i < 256; i++) {
                b16M[b16D.charAt(i >> 4) + b16D.charAt(i & 15)] = String.fromCharCode(i);
            }
            if (!data.match(/^[a-f0-9]*$/i)) return false;
            if (data.length % 2) data = '0' + data;
            var result = new Array();
            var j = 0;
            for (var i = 0; i < data.length; i += 2) {
                result[j++] = b16M[data.substr(i, 2)];
            }
            return result.join('');
        },
        rc4Encrypt: function (key, pt) {
            s = new Array();
            for (var i = 0; i < 256; i++) {
                s[i] = i;
            };
            var j = 0;
            var x;
            for (i = 0; i < 256; i++) {
                j = (j + s[i] + key.charCodeAt(i % key.length)) % 256;
                x = s[i];
                s[i] = s[j];
                s[j] = x;
            }
            i = 0;
            j = 0;
            var ct = '';
            for (var y = 0; y < pt.length; y++) {
                i = (i + 1) % 256;
                j = (j + s[i]) % 256;
                x = s[i];
                s[i] = s[j];
                s[j] = x;
                ct += String.fromCharCode(pt.charCodeAt(y) ^ s[(s[i] + s[j]) % 256]);
            }
            return ct;
        },
        rc4Decrypt: function (key, ct) {
            return $.rc4Encrypt(key, ct);
        },
        rc4EncryptStr: function (str, key) {
            return $.hexEncode($.rc4Encrypt(key, unescape(encodeURIComponent(str))));
        },
        rc4DecryptStr: function (hexStr, key) {
            return decodeURIComponent(escape($.rc4Decrypt(key, $.hexDecode(hexStr))));
        }
    });
    $.rc4 = {};
    $.fn.rc4.ctrlrInst = null;
    $.fn.rc4.ctrlr = function (settings) {
        this.settings = settings;
    };
    var ctrlr = $.fn.rc4.ctrlr;
    ctrlr.prototype.initialise = function () {
        if (this.settings.key) {
            if (this.settings.method) {
                if ($.trim(this.settings.method.toUpperCase()) == "ENCRYPT") {
                    this.setObjectValue($.hexEncode($.rc4Encrypt(this.settings.key, this.getObjectValue())))
                }
                if ($.trim(this.settings.method.toUpperCase()) == "DECRYPT") {
                    this.setObjectValue($.rc4Decrypt(this.settings.key, $.hexDecode(this.getObjectValue())));
                }
            }
        };
    }
    ctrlr.prototype.getObjectValue = function () {
        if ($.fn.rc4.ctrlrInst.container.innerHTML) {
            return $.fn.rc4.ctrlrInst.container.innerHTML;
        }
        if ($.fn.rc4.ctrlrInst.container.value) {
            return $.fn.rc4.ctrlrInst.container.value;
        }
    }
    ctrlr.prototype.setObjectValue = function (data) {
        if ($.fn.rc4.ctrlrInst.container.innerHTML) {
            $.fn.rc4.ctrlrInst.container.innerHTML = data;
        }
        if ($.fn.rc4.ctrlrInst.container.value) {
            $.fn.rc4.ctrlrInst.container.value = data;
        }
    }
})(jQuery);

//암호화 (순수값, 암호키)

function encrypt(){
	$('#cipher').val(
		$.rc4EncryptStr(	$('#text').val(),	$('#key').val()	)
	);
}

//복고화 (암호값, 암호키)
function decrypt(){
	$('#text').val(
		$.rc4DecryptStr(	$('#cipher').val(),	$('#key').val()	)
	); 

}