add base64 converters which aren't universal across browsers

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;
+}
+
+