https://www.fnb.co.za/00Assets/v2.2/js/Base64.js?v=1775959773000

1/**
2*
3*  Base64 encode / decode
4*  http://www.webtoolkit.info/
5*
6**/
7var Base64 = {
8    // private property
9    _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
10    // public method for encoding
11    encode : function (input) {
12        var output = "";
13        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
14        var i = 0;
15        input = Base64._utf8_encode(input);
16        while (i < input.length) {
17            chr1 = input.charCodeAt(i++);
18            chr2 = input.charCodeAt(i++);
19            chr3 = input.charCodeAt(i++);
20            enc1 = chr1 >> 2;
21            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
22            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
23            enc4 = chr3 & 63;
24            if (isNaN(chr2)) {
25                enc3 = enc4 = 64;
26            } else if (isNaN(chr3)) {
27                enc4 = 64;
28            }
29            output = output +
30            this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
31            this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
32        }
33        return output;
34    },
35    // public method for decoding
36    decode : function (input) {
37        var output = "";
38        var chr1, chr2, chr3;
39        var enc1, enc2, enc3, enc4;
40        var i = 0;
41        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
42        while (i < input.length) {
43            enc1 = this._keyStr.indexOf(input.charAt(i++));
44            enc2 = this._keyStr.indexOf(input.charAt(i++));
45            enc3 = this._keyStr.indexOf(input.charAt(i++));
46            enc4 = this._keyStr.indexOf(input.charAt(i++));
47            chr1 = (enc1 << 2) | (enc2 >> 4);
48            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
49            chr3 = ((enc3 & 3) << 6) | enc4;
50            output = output + String.fromCharCode(chr1);
51            if (enc3 != 64) {
52                output = output + String.fromCharCode(chr2);
53            }
54            if (enc4 != 64) {
55                output = output + String.fromCharCode(chr3);
56            }
57        }
58        output = Base64._utf8_decode(output);
59        return output;
60    },
61    // private method for UTF-8 encoding
62    _utf8_encode : function (string) {
63        string = string.replace(/\r\n/g,"\n");
64        var utftext = "";
65        for (var n = 0; n < string.length; n++) {
66            var c = string.charCodeAt(n);
67            if (c < 128) {
68                utftext += String.fromCharCode(c);
69            }
70            else if((c > 127) && (c < 2048)) {
71                utftext += String.fromCharCode((c >> 6) | 192);
72                utftext += String.fromCharCode((c & 63) | 128);
73            }
74            else {
75                utftext += String.fromCharCode((c >> 12) | 224);
76                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
77                utftext += String.fromCharCode((c & 63) | 128);
78            }
79        }
80        return utftext;
81    },
82    // private method for UTF-8 decoding
83    _utf8_decode : function (utftext) {
84        var string = "";
85        var i = 0;
86        var c = c1 = c2 = 0;
87        while ( i < utftext.length ) {
88            c = utftext.charCodeAt(i);
89            if (c < 128) {
90                string += String.fromCharCode(c);
91                i++;
92            }
93            else if((c > 191) && (c < 224)) {
94                c2 = utftext.charCodeAt(i+1);
95                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
96                i += 2;
97            }
98            else {
99                c2 = utftext.charCodeAt(i+1);
100                c3 = utftext.charCodeAt(i+2);
101                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
102                i += 3;
103            }
104        }
105        return string;
106    }
107}