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+# hash-base
+
+[![NPM Package](https://img.shields.io/npm/v/hash-base.svg?style=flat-square)](https://www.npmjs.org/package/hash-base)
+[![Build Status](https://img.shields.io/travis/crypto-browserify/hash-base.svg?branch=master&style=flat-square)](https://travis-ci.org/crypto-browserify/hash-base)
+[![Dependency status](https://img.shields.io/david/crypto-browserify/hash-base.svg?style=flat-square)](https://david-dm.org/crypto-browserify/hash-base#info=dependencies)
+
+[![js-standard-style](https://cdn.rawgit.com/feross/standard/master/badge.svg)](https://github.com/feross/standard)
+
+Abstract base class to inherit from if you want to create streams implementing the same API as node crypto [Hash][1] (for [Cipher][2] / [Decipher][3] check [crypto-browserify/cipher-base][4]).
+
+## Example
+
+```js
+const HashBase = require('hash-base')
+const inherits = require('inherits')
+
+// our hash function is XOR sum of all bytes
+function MyHash () {
+  HashBase.call(this, 1) // in bytes
+
+  this._sum = 0x00
+}
+
+inherits(MyHash, HashBase)
+
+MyHash.prototype._update = function () {
+  for (let i = 0; i < this._block.length; ++i) this._sum ^= this._block[i]
+}
+
+MyHash.prototype._digest = function () {
+  return this._sum
+}
+
+const data = Buffer.from([ 0x00, 0x42, 0x01 ])
+const hash = new MyHash().update(data).digest()
+console.log(hash) // => 67
+```
+You also can check [source code](index.js) or [crypto-browserify/md5.js][5]
+
+## LICENSE
+
+MIT
+
+[1]: https://nodejs.org/api/crypto.html#crypto_class_hash
+[2]: https://nodejs.org/api/crypto.html#crypto_class_cipher
+[3]: https://nodejs.org/api/crypto.html#crypto_class_decipher
+[4]: https://github.com/crypto-browserify/cipher-base
+[5]: https://github.com/crypto-browserify/md5.js