integrity

Integrity.js
===

Integrity.js is a small collection of utilities for checking integrity of a file.

It makes use of the es6-promise polyfill to provide promise functionality.

TODO

- SHA-1, SHA-256, SHA-384, SHA-512
- CRC16

Install
==

Node:

``
npm install integrity
`

Bower:

`
bower install integrity
`

Use
==

Node:

`
var integrity = require('integrity');
`

Bower:

`

`

Supported Inputs
==

All methods support the following inputs:

- Buffer (Node)
- String
- ArrayBuffer
- ReadableStream (Node)
- File (HTML5)

Supported Algorithms
==

- CRC32 (built in)
- MD5 (spark-md5 for browers, crypto for Node)

HTML5 File Example
==

`javascript
document.querySelector('#file').addEventListener('change', function(e) {
var file = e.target.files[0],
reader = new FileReader();

reader.onloadend = function(e) {
// e.target.result is an ArrayBuffer
integrity.crc32(e.target.result).then(function(c) {
console.log(c.toString(16));
});
};

reader.readAsArrayBuffer(file);
});
`

CRC32
==

Example:

`javascript
integrity.crc32('123456789').then(function(crc) {
console.log(crc); // 0xCBF43926
});
integrity.crc32(new Buffer('123456789')).then(function(crc) {
console.log(crc); // 0xCBF43926
});
integrity.crc32(fs.createReadStream('test')).then(function(crc) {
console.log(crc); // CRC32 of file 'test'
});
``