134 lines
3.8 KiB
Markdown
134 lines
3.8 KiB
Markdown
<h1 align="center">
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<br>
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<br>
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<br>
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<img width="380" src="media/logo.svg" alt="hasha">
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<br>
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<br>
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<br>
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<br>
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<br>
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</h1>
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> Hashing made simple. Get the hash of a buffer/string/stream/file.
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[](https://travis-ci.org/sindresorhus/hasha)
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Convenience wrapper around the core [`crypto` Hash class](https://nodejs.org/api/crypto.html#crypto_crypto_createhash_algorithm) with simpler API and better defaults.
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## Install
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```
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$ npm install hasha
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```
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## Usage
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```js
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const hasha = require('hasha');
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hasha('unicorn');
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//=> 'e233b19aabc7d5e53826fb734d1222f1f0444c3a3fc67ff4af370a66e7cadd2cb24009f1bc86f0bed12ca5fcb226145ad10fc5f650f6ef0959f8aadc5a594b27'
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```
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```js
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const hasha = require('hasha');
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(async () => {
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console.log(await hasha.async('unicorn'));
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//=> 'e233b19aabc7d5e53826fb734d1222f1f0444c3a3fc67ff4af370a66e7cadd2cb24009f1bc86f0bed12ca5fcb226145ad10fc5f650f6ef0959f8aadc5a594b27'
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})();
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```
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```js
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const hasha = require('hasha');
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// Hash the process input and output the hash sum
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process.stdin.pipe(hasha.stream()).pipe(process.stdout);
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```
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```js
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const hasha = require('hasha');
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(async () => {
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// Get the MD5 hash of an image
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const hash = await hasha.fromFile('unicorn.png', {algorithm: 'md5'});
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console.log(hash);
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//=> '1abcb33beeb811dca15f0ac3e47b88d9'
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})();
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```
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## API
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See the Node.js [`crypto` docs](https://nodejs.org/api/crypto.html#crypto_crypto_createhash_algorithm_options) for more about hashing.
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### hasha(input, [options])
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Returns a hash.
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#### input
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Type: `Buffer | string | Array<Buffer | string>`
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Buffer you want to hash.
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While strings are supported you should prefer buffers as they're faster to hash. Although if you already have a string you should not convert it to a buffer.
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Pass an array instead of concatenating strings and/or buffers. The output is the same, but arrays do not incur the overhead of concatenation.
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#### options
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Type: `object`
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##### encoding
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Type: `string`<br>
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Default: `'hex'`<br>
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Values: `'hex'` `'base64'` `'buffer'` `'latin1'`
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Encoding of the returned hash.
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##### algorithm
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Type: `string`<br>
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Default: `'sha512'`<br>
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Values: `'md5'` `'sha1'` `'sha256'` `'sha512'` *([Platform dependent](https://nodejs.org/api/crypto.html#crypto_crypto_createhash_algorithm_options))*
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*The `md5` algorithm is good for [file revving](https://github.com/sindresorhus/rev-hash), but you should never use `md5` or `sha1` for anything sensitive. [They're insecure.](http://googleonlinesecurity.blogspot.no/2014/09/gradually-sunsetting-sha-1.html)*
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### hasha.async(input, options?)
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In Node.js 12 or later, the operation is executed using `worker_threads`. A thread is lazily spawned on the first operation and lives until the end of the program execution. It's unrefed, so it won't keep the process alive.
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Returns a hash asynchronously.
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### hasha.stream(options?)
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Returns a [hash transform stream](https://nodejs.org/api/crypto.html#crypto_class_hash).
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### hasha.fromStream(stream, options?)
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Returns a `Promise` for the calculated hash.
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### hasha.fromFile(filepath, options?)
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In Node.js 12 or later, the operation is executed using `worker_threads`. A thread is lazily spawned on the first operation and lives until the end of the program execution. It's unrefed, so it won't keep the process alive.
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Returns a `Promise` for the calculated file hash.
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### hasha.fromFileSync(filepath, options?)
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Returns the calculated file hash.
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## Related
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- [hasha-cli](https://github.com/sindresorhus/hasha-cli) - CLI for this module
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- [crypto-hash](https://github.com/sindresorhus/crypto-hash) - Tiny hashing module that uses the native crypto API in Node.js and the browser
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- [hash-obj](https://github.com/sindresorhus/hash-obj) - Get the hash of an object
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- [md5-hex](https://github.com/sindresorhus/md5-hex) - Create a MD5 hash with hex encoding
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