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49 lines
1.6 KiB
49 lines
1.6 KiB
# hash-base
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[](https://www.npmjs.org/package/hash-base)
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[](https://travis-ci.org/crypto-browserify/hash-base)
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[](https://david-dm.org/crypto-browserify/hash-base#info=dependencies)
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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]).
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## Example
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```js
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const HashBase = require('hash-base');
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const inherits = require('inherits');
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// our hash function is XOR sum of all bytes
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function MyHash () {
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HashBase.call(this, 1); // in bytes
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this._sum = 0x00;
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};
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inherits(MyHash, HashBase)
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MyHash.prototype._update = function () {
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for (let i = 0; i < this._block.length; ++i) {
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this._sum ^= this._block[i];
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}
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};
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MyHash.prototype._digest = function () {
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return this._sum;
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};
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const data = Buffer.from([0x00, 0x42, 0x01]);
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const hash = new MyHash().update(data).digest();
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console.log(hash); // => 67
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```
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You also can check [source code](index.js) or [crypto-browserify/md5.js][5]
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## LICENSE
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MIT
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[1]: https://nodejs.org/api/crypto.html#crypto_class_hash
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[2]: https://nodejs.org/api/crypto.html#crypto_class_cipher
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[3]: https://nodejs.org/api/crypto.html#crypto_class_decipher
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[4]: https://github.com/crypto-browserify/cipher-base
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[5]: https://github.com/crypto-browserify/md5.js
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