/**
* Base64 operations.
*
* @author n1474335 [n1474335@gmail.com]
* @copyright Crown Copyright 2016
* @license Apache-2.0
*
* @namespace
*/
var Base64 = {
/**
* @constant
* @default
*/
ALPHABET: "A-Za-z0-9+/=",
/**
* @constant
* @default
*/
ALPHABET_OPTIONS: [
{name: "Standard: A-Za-z0-9+/=", value: "A-Za-z0-9+/="},
{name: "URL safe: A-Za-z0-9-_", value: "A-Za-z0-9-_"},
{name: "Filename safe: A-Za-z0-9+-=", value: "A-Za-z0-9+\\-="},
{name: "itoa64: ./0-9A-Za-z=", value: "./0-9A-Za-z="},
{name: "XML: A-Za-z0-9_.", value: "A-Za-z0-9_."},
{name: "y64: A-Za-z0-9._-", value: "A-Za-z0-9._-"},
{name: "z64: 0-9a-zA-Z+/=", value: "0-9a-zA-Z+/="},
{name: "Radix-64: 0-9A-Za-z+/=", value: "0-9A-Za-z+/="},
{name: "Uuencoding: [space]-_", value: " -_"},
{name: "Xxencoding: +-0-9A-Za-z", value: "+\\-0-9A-Za-z"},
{name: "BinHex: !-,-0-689@A-NP-VX-Z[`a-fh-mp-r", value: "!-,-0-689@A-NP-VX-Z[`a-fh-mp-r"},
{name: "ROT13: N-ZA-Mn-za-m0-9+/=", value: "N-ZA-Mn-za-m0-9+/="},
],
/**
* To Base64 operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {string}
*/
run_to: function(input, args) {
var alphabet = args[0] || Base64.ALPHABET;
return Utils.to_base64(input, alphabet);
},
/**
* @constant
* @default
*/
REMOVE_NON_ALPH_CHARS: true,
/**
* From Base64 operation.
*
* @param {string} input
* @param {Object[]} args
* @returns {byte_array}
*/
run_from: function(input, args) {
var alphabet = args[0] || Base64.ALPHABET,
remove_non_alph_chars = args[1];
return Utils.from_base64(input, alphabet, "byte_array", remove_non_alph_chars);
},
/**
* @constant
* @default
*/
BASE32_ALPHABET: "A-Z2-7=",
/**
* To Base32 operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {string}
*/
run_to_32: function(input, args) {
if (!input) return "";
var alphabet = args[0] ?
Utils.expand_alph_range(args[0]).join("") : "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567=",
output = "",
chr1, chr2, chr3, chr4, chr5,
enc1, enc2, enc3, enc4, enc5, enc6, enc7, enc8,
i = 0;
while (i < input.length) {
chr1 = input[i++];
chr2 = input[i++];
chr3 = input[i++];
chr4 = input[i++];
chr5 = input[i++];
enc1 = chr1 >> 3;
enc2 = ((chr1 & 7) << 2) | (chr2 >> 6);
enc3 = (chr2 >> 1) & 31;
enc4 = ((chr2 & 1) << 4) | (chr3 >> 4);
enc5 = ((chr3 & 15) << 1) | (chr4 >> 7);
enc6 = (chr4 >> 2) & 63;
enc7 = ((chr4 & 3) << 3) | (chr5 >> 5);
enc8 = chr5 & 31;
if (isNaN(chr2)) {
enc3 = enc4 = enc5 = enc6 = enc7 = enc8 = 32;
} else if (isNaN(chr3)) {
enc5 = enc6 = enc7 = enc8 = 32;
} else if (isNaN(chr4)) {
enc6 = enc7 = enc8 = 32;
} else if (isNaN(chr5)) {
enc8 = 32;
}
output += alphabet.charAt(enc1) + alphabet.charAt(enc2) + alphabet.charAt(enc3) +
alphabet.charAt(enc4) + alphabet.charAt(enc5) + alphabet.charAt(enc6) +
alphabet.charAt(enc7) + alphabet.charAt(enc8);
}
return output;
},
/**
* From Base32 operation.
*
* @param {string} input
* @param {Object[]} args
* @returns {byte_array}
*/
run_from_32: function(input, args) {
if (!input) return [];
var alphabet = args[0] ?
Utils.expand_alph_range(args[0]).join("") : "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567=",
remove_non_alph_chars = args[0];
var output = [],
chr1, chr2, chr3, chr4, chr5,
enc1, enc2, enc3, enc4, enc5, enc6, enc7, enc8,
i = 0;
if (remove_non_alph_chars) {
var re = new RegExp("[^" + alphabet.replace(/[\]\\\-^]/g, "\\$&") + "]", "g");
input = input.replace(re, "");
}
while (i < input.length) {
enc1 = alphabet.indexOf(input.charAt(i++));
enc2 = alphabet.indexOf(input.charAt(i++) || "=");
enc3 = alphabet.indexOf(input.charAt(i++) || "=");
enc4 = alphabet.indexOf(input.charAt(i++) || "=");
enc5 = alphabet.indexOf(input.charAt(i++) || "=");
enc6 = alphabet.indexOf(input.charAt(i++) || "=");
enc7 = alphabet.indexOf(input.charAt(i++) || "=");
enc8 = alphabet.indexOf(input.charAt(i++) || "=");
chr1 = (enc1 << 3) | (enc2 >> 2);
chr2 = ((enc2 & 3) << 6) | (enc3 << 1) | (enc4 >> 4);
chr3 = ((enc4 & 15) << 4) | (enc5 >> 1);
chr4 = ((enc5 & 1) << 7) | (enc6 << 2) | (enc7 >> 3);
chr5 = ((enc7 & 7) << 5) | enc8;
output.push(chr1);
if (enc2 & 3 !== 0 || enc3 !== 32) output.push(chr2);
if (enc4 & 15 !== 0 || enc5 !== 32) output.push(chr3);
if (enc5 & 1 !== 0 || enc6 !== 32) output.push(chr4);
if (enc7 & 7 !== 0 || enc8 !== 32) output.push(chr5);
}
return output;
},
/**
* @constant
* @default
*/
SHOW_IN_BINARY: false,
/**
* @constant
* @default
*/
OFFSETS_SHOW_VARIABLE: true,
/**
* Show Base64 offsets operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {html}
*/
run_offsets: function(input, args) {
var alphabet = args[0] || Base64.ALPHABET,
show_variable = args[1],
offset0 = Utils.to_base64(input, alphabet),
offset1 = Utils.to_base64([0].concat(input), alphabet),
offset2 = Utils.to_base64([0, 0].concat(input), alphabet),
len0 = offset0.indexOf("="),
len1 = offset1.indexOf("="),
len2 = offset2.indexOf("="),
script = "<script type='application/javascript'>$('[data-toggle=\"tooltip\"]').tooltip()</script>",
static_section = "",
padding = "";
if (input.length < 1) {
return "Please enter a string.";
}
// Highlight offset 0
if (len0 % 4 == 2) {
static_section = offset0.slice(0, -3);
offset0 = "<span data-toggle='tooltip' data-placement='top' title='" +
Utils.from_base64(static_section, alphabet).slice(0, -2) + "'>" +
static_section + "</span>" +
"<span class='hlgreen'>" + offset0.substr(offset0.length - 3, 1) + "</span>" +
"<span class='hlred'>" + offset0.substr(offset0.length - 2) + "</span>";
} else if (len0 % 4 == 3) {
static_section = offset0.slice(0, -2);
offset0 = "<span data-toggle='tooltip' data-placement='top' title='" +
Utils.from_base64(static_section, alphabet).slice(0, -1) + "'>" +
static_section + "</span>" +
"<span class='hlgreen'>" + offset0.substr(offset0.length - 2, 1) + "</span>" +
"<span class='hlred'>" + offset0.substr(offset0.length - 1) + "</span>";
} else {
static_section = offset0;
offset0 = "<span data-toggle='tooltip' data-placement='top' title='" +
Utils.from_base64(static_section, alphabet) + "'>" +
static_section + "</span>";
}
if (!show_variable) {
offset0 = static_section;
}
// Highlight offset 1
padding = "<span class='hlred'>" + offset1.substr(0, 1) + "</span>" +
"<span class='hlgreen'>" + offset1.substr(1, 1) + "</span>";
offset1 = offset1.substr(2);
if (len1 % 4 == 2) {
static_section = offset1.slice(0, -3);
offset1 = padding + "<span data-toggle='tooltip' data-placement='top' title='" +
Utils.from_base64("AA" + static_section, alphabet).slice(1, -2) + "'>" +
static_section + "</span>" +
"<span class='hlgreen'>" + offset1.substr(offset1.length - 3, 1) + "</span>" +
"<span class='hlred'>" + offset1.substr(offset1.length - 2) + "</span>";
} else if (len1 % 4 == 3) {
static_section = offset1.slice(0, -2);
offset1 = padding + "<span data-toggle='tooltip' data-placement='top' title='" +
Utils.from_base64("AA" + static_section, alphabet).slice(1, -1) + "'>" +
static_section + "</span>" +
"<span class='hlgreen'>" + offset1.substr(offset1.length - 2, 1) + "</span>" +
"<span class='hlred'>" + offset1.substr(offset1.length - 1) + "</span>";
} else {
static_section = offset1;
offset1 = padding + "<span data-toggle='tooltip' data-placement='top' title='" +
Utils.from_base64("AA" + static_section, alphabet).slice(1) + "'>" +
static_section + "</span>";
}
if (!show_variable) {
offset1 = static_section;
}
// Highlight offset 2
padding = "<span class='hlred'>" + offset2.substr(0, 2) + "</span>" +
"<span class='hlgreen'>" + offset2.substr(2, 1) + "</span>";
offset2 = offset2.substr(3);
if (len2 % 4 == 2) {
static_section = offset2.slice(0, -3);
offset2 = padding + "<span data-toggle='tooltip' data-placement='top' title='" +
Utils.from_base64("AAA" + static_section, alphabet).slice(2, -2) + "'>" +
static_section + "</span>" +
"<span class='hlgreen'>" + offset2.substr(offset2.length - 3, 1) + "</span>" +
"<span class='hlred'>" + offset2.substr(offset2.length - 2) + "</span>";
} else if (len2 % 4 == 3) {
static_section = offset2.slice(0, -2);
offset2 = padding + "<span data-toggle='tooltip' data-placement='top' title='" +
Utils.from_base64("AAA" + static_section, alphabet).slice(2, -2) + "'>" +
static_section + "</span>" +
"<span class='hlgreen'>" + offset2.substr(offset2.length - 2, 1) + "</span>" +
"<span class='hlred'>" + offset2.substr(offset2.length - 1) + "</span>";
} else {
static_section = offset2;
offset2 = padding + "<span data-toggle='tooltip' data-placement='top' title='" +
Utils.from_base64("AAA" + static_section, alphabet).slice(2) + "'>" +
static_section + "</span>";
}
if (!show_variable) {
offset2 = static_section;
}
return (show_variable ? "Characters highlighted in <span class='hlgreen'>green</span> could change if the input is surrounded by more data." +
"\nCharacters highlighted in <span class='hlred'>red</span> are for padding purposes only." +
"\nUnhighlighted characters are <span data-toggle='tooltip' data-placement='top' title='Tooltip on left'>static</span>." +
"\nHover over the static sections to see what they decode to on their own.\n" +
"\nOffset 0: " + offset0 +
"\nOffset 1: " + offset1 +
"\nOffset 2: " + offset2 +
script :
offset0 + "\n" + offset1 + "\n" + offset2);
},
/**
* Highlight to Base64
*
* @param {Object[]} pos
* @param {number} pos[].start
* @param {number} pos[].end
* @param {Object[]} args
* @returns {Object[]} pos
*/
highlight_to: function(pos, args) {
pos[0].start = Math.floor(pos[0].start / 3 * 4);
pos[0].end = Math.ceil(pos[0].end / 3 * 4);
return pos;
},
/**
* Highlight from Base64
*
* @param {Object[]} pos
* @param {number} pos[].start
* @param {number} pos[].end
* @param {Object[]} args
* @returns {Object[]} pos
*/
highlight_from: function(pos, args) {
pos[0].start = Math.ceil(pos[0].start / 4 * 3);
pos[0].end = Math.floor(pos[0].end / 4 * 3);
return pos;
},
};
CyberChef