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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | # sha
Check and get file hashes (using any algorithm)
[](https://travis-ci.org/ForbesLindesay/sha)
[](https://gemnasium.com/ForbesLindesay/sha)
[](http://badge.fury.io/js/sha)
## Installation
$ npm install sha
## API
### check(fileName, expected, [options,] cb) / checkSync(filename, expected, [options])
Asynchronously check that `fileName` has a "hash" of `expected`. The callback will be called with either `null` or an error (indicating that they did not match).
Options:
- algorithm: defaults to `sha1` and can be any of the algorithms supported by `crypto.createHash`
### get(fileName, [options,] cb) / getSync(filename, [options])
Asynchronously get the "hash" of `fileName`. The callback will be called with an optional `error` object and the (lower cased) hex digest of the hash.
Options:
- algorithm: defaults to `sha1` and can be any of the algorithms supported by `crypto.createHash`
### stream(expected, [options])
Check the hash of a stream without ever buffering it. This is a pass through stream so you can do things like:
```js
fs.createReadStream('src')
.pipe(sha.stream('expected'))
.pipe(fs.createWriteStream('dest'))
```
`dest` will be a complete copy of `src` and an error will be emitted if the hash did not match `'expected'`.
Options:
- algorithm: defaults to `sha1` and can be any of the algorithms supported by `crypto.createHash`
## License
You may use this software under the BSD or MIT. Take your pick. If you want me to release it under another license, open a pull request.
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