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| -rw-r--r-- | js/crypto.js | 109 |
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; +} + + |