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Chalarangelo
2021-10-13 20:09:28 +03:00
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snippets/hashBrowser.md
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title: hashBrowser
tags: browser,promise,advanced
firstSeen: 2018-01-17T14:09:01+02:00
lastUpdated: 2020-10-22T20:23:47+03:00
lastUpdated: 2021-10-13T19:29:39+02:00
---
Creates a hash for a value using the [SHA-256](https://en.wikipedia.org/wiki/SHA-2) algorithm.
Returns a promise.
- Use the [SubtleCrypto](https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto) API to create a hash for the given value.
- Create a new `TextEncoder` and use it to encode `val`, passing its value to `SubtleCrypto.digest()` to generate a digest of the given data.
- Create a new `TextEncoder` and use it to encode `val`. Pass its value to `SubtleCrypto.digest()` to generate a digest of the given data.
- Use `DataView.prototype.getUint32()` to read data from the resolved `ArrayBuffer`.
- Add the data to an array using `Array.prototype.push()` after converting it to its hexadecimal representation using `Number.prototype.toString(16)`.
- Convert the data to it hexadecimal representation using `Number.prototype.toString(16)`. Add the data to an array using `Array.prototype.push()`.
- Finally, use `Array.prototype.join()` to combine values in the array of `hexes` into a string.
```js