JSDoc: Source: encode/base64.js

# Source: encode/base64.js

    //
    // Copyright (c) 2006-2026 Wade Alcorn - wade@bindshell.net
    // Browser Exploitation Framework (BeEF) - https://beefproject.com
    // See the file 'doc/COPYING' for copying permission
    //

    // Base64 code from http://stackoverflow.com/questions/3774622/how-to-base64-encode-inside-of-javascript/3774662#3774662

    beef.encode = {};

    /**
     * Base64 code from http://stackoverflow.com/questions/3774622/how-to-base64-encode-inside-of-javascript/3774662#3774662
     * @namespace beef.encode.base64
     */
    beef.encode.base64 = {

    	keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
        /**
         * @memberof beef.encode.base64
         * @param {string} input
         * @return {string}
         */
        encode : function (input) {
            if (window.btoa) {
               return btoa(unescape(encodeURIComponent(input)));
            }

            var output = "";
            var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
            var i = 0;

            input = beef.encode.base64.utf8_encode(input);

            while (i < input.length) {

                chr1 = input.charCodeAt(i++);
                chr2 = input.charCodeAt(i++);
                chr3 = input.charCodeAt(i++);

                enc1 = chr1 >> 2;
                enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
                enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
                enc4 = chr3 & 63;

                if (isNaN(chr2)) {
                    enc3 = enc4 = 64;
                } else if (isNaN(chr3)) {
                    enc4 = 64;
                }

                output = output +
                this.keyStr.charAt(enc1) + this.keyStr.charAt(enc2) +
                this.keyStr.charAt(enc3) + this.keyStr.charAt(enc4);

            }

            return output;
        },

        /**
         * @memberof beef.encode.base64
         * @param {string} input
         * @return {string}
         */
        decode : function (input) {
            if (window.atob) {
                return escape(atob(input));
            }

            var output = "";
            var chr1, chr2, chr3;
            var enc1, enc2, enc3, enc4;
            var i = 0;

            input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

            while (i < input.length) {

                enc1 = this.keyStr.indexOf(input.charAt(i++));
                enc2 = this.keyStr.indexOf(input.charAt(i++));
                enc3 = this.keyStr.indexOf(input.charAt(i++));
                enc4 = this.keyStr.indexOf(input.charAt(i++));

                chr1 = (enc1 << 2) | (enc2 >> 4);
                chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
                chr3 = ((enc3 & 3) << 6) | enc4;

                output = output + String.fromCharCode(chr1);

                if (enc3 != 64) {
                    output = output + String.fromCharCode(chr2);
                }
                if (enc4 != 64) {
                    output = output + String.fromCharCode(chr3);
                }

            }

            output = beef.encode.base64.utf8_decode(output);

            return output;

        },

        /**
         * @memberof beef.encode.base64
         * @param {string} string
         * @return {string}
         */
        utf8_encode : function (string) {
            string = string.replace(/\r\n/g,"\n");
            var utftext = "";

            for (var n = 0; n < string.length; n++) {

                var c = string.charCodeAt(n);

                if (c < 128) {
                    utftext += String.fromCharCode(c);
                }
                else if((c > 127) && (c < 2048)) {
                    utftext += String.fromCharCode((c >> 6) | 192);
                    utftext += String.fromCharCode((c & 63) | 128);
                }
                else {
                    utftext += String.fromCharCode((c >> 12) | 224);
                    utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                    utftext += String.fromCharCode((c & 63) | 128);
                }

            }

            return utftext;
        },
        /**
         * @memberof beef.encode.base64
         * @param {string} utftext
         * @return {string}
         */
        utf8_decode : function (utftext) {
            var string = "";
            var i = 0;
            var c = c1 = c2 = 0;

            while ( i < utftext.length ) {

                c = utftext.charCodeAt(i);

                if (c < 128) {
                    string += String.fromCharCode(c);
                    i++;
                }
                else if((c > 191) && (c < 224)) {
                    c2 = utftext.charCodeAt(i+1);
                    string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                    i += 2;
                }
                else {
                    c2 = utftext.charCodeAt(i+1);
                    c3 = utftext.charCodeAt(i+2);
                    string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                    i += 3;
                }

            }

            return string;
        }

    };

    beef.regCmp('beef.encode.base64');