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use package thirty-two for base32 encoding/decoding

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Roman Shtylman 2012-05-31 18:54:35 -04:00
parent 85b2e89fe7
commit 9f68f20826
3 changed files with 5 additions and 236 deletions
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216
lib/external/nibbler.js vendored
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@ -1,216 +0,0 @@
/*
Copyright (c) 2010 Thomas Peri
http://www.tumuski.com/
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*jslint white: true, browser: true, onevar: true, undef: true, nomen: true,
eqeqeq: true, plusplus: true, regexp: true, newcap: true, immed: true */
// (good parts minus bitwise and strict, plus white.)
/**
* Nibbler - Multi-Base Encoder
*
* version 2010-04-07
*
* Options:
* dataBits: The number of bits in each character of unencoded data.
* codeBits: The number of bits in each character of encoded data.
* keyString: The characters that correspond to each value when encoded.
* pad (optional): The character to pad the end of encoded output.
* arrayData (optional): If truthy, unencoded data is an array instead of a string.
*
* Example:
*
* var base64_8bit = new Nibbler({
* dataBits: 8,
* codeBits: 6,
* keyString: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
* pad: '='
* });
* base64_8bit.encode("Hello, World!"); // returns "SGVsbG8sIFdvcmxkIQ=="
* base64_8bit.decode("SGVsbG8sIFdvcmxkIQ=="); // returns "Hello, World!"
*
* var base64_7bit = new Nibbler({
* dataBits: 7,
* codeBits: 6,
* keyString: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
* pad: '='
* });
* base64_7bit.encode("Hello, World!"); // returns "kZdmzesQV9/LZkQg=="
* base64_7bit.decode("kZdmzesQV9/LZkQg=="); // returns "Hello, World!"
*
*/
var Nibbler = function (options) {
var construct,
// options
pad, dataBits, codeBits, keyString, arrayData,
// private instance variables
mask, group, max,
// private methods
gcd, translate,
// public methods
encode, decode;
// pseudo-constructor
construct = function () {
var i, mag, prev;
// options
pad = options.pad || '';
dataBits = options.dataBits;
codeBits = options.codeBits;
keyString = options.keyString;
arrayData = options.arrayData;
// bitmasks
mag = Math.max(dataBits, codeBits);
prev = 0;
mask = [];
for (i = 0; i < mag; i += 1) {
mask.push(prev);
prev += prev + 1;
}
max = prev;
// ouput code characters in multiples of this number
group = dataBits / gcd(dataBits, codeBits);
};
// greatest common divisor
gcd = function (a, b) {
var t;
while (b !== 0) {
t = b;
b = a % b;
a = t;
}
return a;
};
// the re-coder
translate = function (input, bitsIn, bitsOut, decoding) {
var i, len, chr, byteIn,
buffer, size, output,
write;
// append a byte to the output
write = function (n) {
if (!decoding) {
output.push(keyString.charAt(n));
} else if (arrayData) {
output.push(n);
} else {
output.push(String.fromCharCode(n));
}
};
buffer = 0;
size = 0;
output = [];
len = input.length;
for (i = 0; i < len; i += 1) {
// the new size the buffer will be after adding these bits
size += bitsIn;
// read a character
if (decoding) {
// decode it
chr = input.charAt(i);
byteIn = keyString.indexOf(chr);
if (chr === pad) {
break;
} else if (byteIn < 0) {
throw 'the character "' + chr + '" is not a member of ' + keyString;
}
} else {
if (arrayData) {
byteIn = input[i];
} else {
byteIn = input.charCodeAt(i);
}
if ((byteIn | max) !== max) {
throw byteIn + " is outside the range 0-" + max;
}
}
// shift the buffer to the left and add the new bits
buffer = (buffer << bitsIn) | byteIn;
// as long as there's enough in the buffer for another output...
while (size >= bitsOut) {
// the new size the buffer will be after an output
size -= bitsOut;
// output the part that lies to the left of that number of bits
// by shifting the them to the right
write(buffer >> size);
// remove the bits we wrote from the buffer
// by applying a mask with the new size
buffer &= mask[size];
}
}
// If we're encoding and there's input left over, pad the output.
// Otherwise, leave the extra bits off, 'cause they themselves are padding
if (!decoding && size > 0) {
// flush the buffer
write(buffer << (bitsOut - size));
// add padding keyString for the remainder of the group
len = output.length % group;
for (i = 0; i < len; i += 1) {
output.push(pad);
}
}
// string!
return (arrayData && decoding) ? output : output.join('');
};
/**
* Encode. Input and output are strings.
*/
encode = function (input) {
return translate(input, dataBits, codeBits, false);
};
/**
* Decode. Input and output are strings.
*/
decode = function (input) {
return translate(input, codeBits, dataBits, true);
};
this.encode = encode;
this.decode = decode;
construct();
};
// For nodejs
module.exports = Nibbler;

21
lib/notp.js
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@ -1,9 +1,6 @@
/* var crypto = require('crypto');
* Requires var base32 = require('thirty-two');
*/
var crypto = require('crypto'),
base32 = require('./external/nibbler');
/* /*
@ -11,21 +8,7 @@ var crypto = require('crypto'),
*/ */
module.exports = new Notp(); module.exports = new Notp();
/*
* Constructor function.
*
* Builds th base32 object
*/
function Notp() { function Notp() {
base32 = new base32(
{
dataBits: 8,
codeBits: 5,
keyString: 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567',
pad: '='
}
);
} }

4
package.json
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@ -15,7 +15,9 @@
"engines": { "engines": {
"node": "~v0.4.10" "node": "~v0.4.10"
}, },
"dependencies": {}, "dependencies": {
"thirty-two": "0.0.1"
},
"devDependencies": { "devDependencies": {
"expresso" : "0.9.0" "expresso" : "0.9.0"
} }