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-rw-r--r--js/crypto.js109
1 files changed, 109 insertions, 0 deletions
diff --git a/js/crypto.js b/js/crypto.js
new file mode 100644
index 000000000..4f1570f7e
--- /dev/null
+++ b/js/crypto.js
@@ -0,0 +1,109 @@
+
+function base64_encode (data) {
+ // http://kevin.vanzonneveld.net
+ // + original by: Tyler Akins (http://rumkin.com)
+ // + improved by: Bayron Guevara
+ // + improved by: Thunder.m
+ // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
+ // + bugfixed by: Pellentesque Malesuada
+ // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
+ // + improved by: Rafa? Kukawski (http://kukawski.pl)
+ // * example 1: base64_encode('Kevin van Zonneveld');
+ // * returns 1: 'S2V2aW4gdmFuIFpvbm5ldmVsZA=='
+ // mozilla has this native
+ // - but breaks in 2.0.0.12!
+ //if (typeof this.window['btoa'] === 'function') {
+ // return btoa(data);
+ //}
+ var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
+ var o1, o2, o3, h1, h2, h3, h4, bits, i = 0,
+ ac = 0,
+ enc = "",
+ tmp_arr = [];
+
+ if (!data) {
+ return data;
+ }
+
+ do { // pack three octets into four hexets
+ o1 = data.charCodeAt(i++);
+ o2 = data.charCodeAt(i++);
+ o3 = data.charCodeAt(i++);
+
+ bits = o1 << 16 | o2 << 8 | o3;
+
+ h1 = bits >> 18 & 0x3f;
+ h2 = bits >> 12 & 0x3f;
+ h3 = bits >> 6 & 0x3f;
+ h4 = bits & 0x3f;
+
+ // use hexets to index into b64, and append result to encoded string
+ tmp_arr[ac++] = b64.charAt(h1) + b64.charAt(h2) + b64.charAt(h3) + b64.charAt(h4);
+ } while (i < data.length);
+
+ enc = tmp_arr.join('');
+
+ var r = data.length % 3;
+
+ return (r ? enc.slice(0, r - 3) : enc) + '==='.slice(r || 3);
+
+}
+
+
+function base64_decode (data) {
+ // http://kevin.vanzonneveld.net
+ // + original by: Tyler Akins (http://rumkin.com)
+ // + improved by: Thunder.m
+ // + input by: Aman Gupta
+ // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
+ // + bugfixed by: Onno Marsman
+ // + bugfixed by: Pellentesque Malesuada
+ // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
+ // + input by: Brett Zamir (http://brett-zamir.me)
+ // + bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
+ // * example 1: base64_decode('S2V2aW4gdmFuIFpvbm5ldmVsZA==');
+ // * returns 1: 'Kevin van Zonneveld'
+ // mozilla has this native
+ // - but breaks in 2.0.0.12!
+ //if (typeof this.window['atob'] === 'function') {
+ // return atob(data);
+ //}
+ var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
+ var o1, o2, o3, h1, h2, h3, h4, bits, i = 0,
+ ac = 0,
+ dec = "",
+ tmp_arr = [];
+
+ if (!data) {
+ return data;
+ }
+
+ data += '';
+
+ do { // unpack four hexets into three octets using index points in b64
+ h1 = b64.indexOf(data.charAt(i++));
+ h2 = b64.indexOf(data.charAt(i++));
+ h3 = b64.indexOf(data.charAt(i++));
+ h4 = b64.indexOf(data.charAt(i++));
+
+ bits = h1 << 18 | h2 << 12 | h3 << 6 | h4;
+
+ o1 = bits >> 16 & 0xff;
+ o2 = bits >> 8 & 0xff;
+ o3 = bits & 0xff;
+
+ if (h3 == 64) {
+ tmp_arr[ac++] = String.fromCharCode(o1);
+ } else if (h4 == 64) {
+ tmp_arr[ac++] = String.fromCharCode(o1, o2);
+ } else {
+ tmp_arr[ac++] = String.fromCharCode(o1, o2, o3);
+ }
+ } while (i < data.length);
+
+ dec = tmp_arr.join('');
+
+ return dec;
+}
+
+