# sha256

Calculates the [Sha256](https://en.wikipedia.org/wiki/SHA-256) hash of a byte array or hex value.

This function is a re-export of `sha256` from [`@noble/hashes`](https://github.com/paulmillr/noble-hashes) – an audited & minimal JS hashing library.

## Install

```ts
import { sha256 } from 'viem'
```

## Usage

```ts
import { sha256 } from 'viem'

sha256(new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33])
// 0x7f83b1657ff1fc53b92dc18148a1d65dfc2d4b1fa3d677284addd200126d9069

sha256('0xdeadbeef')
// 0x5f78c33274e43fa9de5659265c1d917e25c03722dcb0b8d27db8d5feaa813953
```

## Returns

`Hex | ByteArray`

The hashed value.

## Parameters

### value

* **Type:** `Hex | ByteArray`

The hex value or byte array to hash.

### to

* **Type:** `"bytes" | "hex"`
* **Default:** `"hex"`

The output type.

```ts
import { sha256 } from 'viem'

sha256(
  new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33],
  'bytes' // [!code focus]
)
// Uint8Array [95, 120, 195, 50, 116, 228, 63, 169, 222, 86, 89, 38, 92, 29, 145, 126, 37, 192, 55, 34, 220, 176, 184, 210, 125, 184, 213, 254, 170, 129, 57, 83] // [!code focus]
```