https://muaythaiontario.org/wp-content/plugins/gravityformssignatu…/includes/super_signature/base64.js?ver=4.2

1var Base64 = {
2 
3	// private property
4	_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
5 
6	// public method for encoding
7	encode : function (input) {
8		var output = "";
9		var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
10		var i = 0;
11 
12		input = Base64._utf8_encode(input);
13 
14		while (i < input.length) {
15 
16			chr1 = input.charCodeAt(i++);
17			chr2 = input.charCodeAt(i++);
18			chr3 = input.charCodeAt(i++);
19 
20			enc1 = chr1 >> 2;
21			enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
22			enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
23			enc4 = chr3 & 63;
24 
25			if (isNaN(chr2)) {
26				enc3 = enc4 = 64;
27			} else if (isNaN(chr3)) {
28				enc4 = 64;
29			}
30 
31			output = output +
32			this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
33			this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
34 
35		}
36 
37		return output;
38	},
39 
40	// public method for decoding
41	decode : function (input) {
42		var output = "";
43		var chr1, chr2, chr3;
44		var enc1, enc2, enc3, enc4;
45		var i = 0;
46 
47		input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
48 
49		while (i < input.length) {
50 
51			enc1 = this._keyStr.indexOf(input.charAt(i++));
52			enc2 = this._keyStr.indexOf(input.charAt(i++));
53			enc3 = this._keyStr.indexOf(input.charAt(i++));
54			enc4 = this._keyStr.indexOf(input.charAt(i++));
55 
56			chr1 = (enc1 << 2) | (enc2 >> 4);
57			chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
58			chr3 = ((enc3 & 3) << 6) | enc4;
59 
60			output = output + String.fromCharCode(chr1);
61 
62			if (enc3 != 64) {
63				output = output + String.fromCharCode(chr2);
64			}
65			if (enc4 != 64) {
66				output = output + String.fromCharCode(chr3);
67			}
68 
69		}
70 
71		output = Base64._utf8_decode(output);
72 
73		return output;
74 
75	},
76 
77	// private method for UTF-8 encoding
78	_utf8_encode : function (string) {
79		string = string.replace(/\r\n/g,"\n");
80		var utftext = "";
81 
82		for (var n = 0; n < string.length; n++) {
83 
84			var c = string.charCodeAt(n);
85 
86			if (c < 128) {
87				utftext += String.fromCharCode(c);
88			}
89			else if((c > 127) && (c < 2048)) {
90				utftext += String.fromCharCode((c >> 6) | 192);
91				utftext += String.fromCharCode((c & 63) | 128);
92			}
93			else {
94				utftext += String.fromCharCode((c >> 12) | 224);
95				utftext += String.fromCharCode(((c >> 6) & 63) | 128);
96				utftext += String.fromCharCode((c & 63) | 128);
97			}
98 
99		}
100 
101		return utftext;
102	},
103 
104	// private method for UTF-8 decoding
105	_utf8_decode : function (utftext) {
106		var string = "";
107		var i = 0;
108		var c = c1 = c2 = 0;
109 
110		while ( i < utftext.length ) {
111 
112			c = utftext.charCodeAt(i);
113 
114			if (c < 128) {
115				string += String.fromCharCode(c);
116				i++;
117			}
118			else if((c > 191) && (c < 224)) {
119				c2 = utftext.charCodeAt(i+1);
120				string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
121				i += 2;
122			}
123			else {
124				c2 = utftext.charCodeAt(i+1);
125				c3 = utftext.charCodeAt(i+2);
126				string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
127				i += 3;
128			}
129 
130		}
131 
132		return string;
133	}
134 
135}