> ## Documentation Index
> Fetch the complete documentation index at: https://voltaire.tevm.sh/llms.txt
> Use this file to discover all available pages before exploring further.

# crypto/SHA256

> Auto-generated API documentation

[**@tevm/voltaire**](../index.mdx)

***

[@tevm/voltaire](../index.mdx) / crypto/SHA256

# crypto/SHA256

## Variables

### BLOCK\_SIZE

> `const` **BLOCK\_SIZE**: `64` = `64`

Defined in: [src/crypto/SHA256/constants.js:27](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/crypto/SHA256/constants.js#L27)

SHA256 block size in bytes

#### See

[https://voltaire.tevm.sh/crypto](https://voltaire.tevm.sh/crypto) for crypto documentation

#### Since

0.0.0

#### Throws

#### Example

```javascript theme={null}
import { BLOCK_SIZE } from './crypto/SHA256/index.js';
console.log(BLOCK_SIZE); // 64
```

***

### OUTPUT\_SIZE

> `const` **OUTPUT\_SIZE**: `32` = `32`

Defined in: [src/crypto/SHA256/constants.js:13](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/crypto/SHA256/constants.js#L13)

SHA256 output size in bytes (256 bits / 8)

#### See

[https://voltaire.tevm.sh/crypto](https://voltaire.tevm.sh/crypto) for crypto documentation

#### Since

0.0.0

#### Throws

#### Example

```javascript theme={null}
import { OUTPUT_SIZE } from './crypto/SHA256/index.js';
console.log(OUTPUT_SIZE); // 32
```

***

### ~~SHA256~~

> `const` **SHA256**: (`input`) => [`SHA256Hash`](../index/index.mdx#sha256hash) & `object` = `SHA256Hash`

Defined in: [src/crypto/SHA256/SHA256.js:62](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/crypto/SHA256/SHA256.js#L62)

#### Type Declaration

##### ~~BLOCK\_SIZE~~

> **BLOCK\_SIZE**: `number`

SHA256 block size in bytes

###### See

[https://voltaire.tevm.sh/crypto](https://voltaire.tevm.sh/crypto) for crypto documentation

###### Since

0.0.0

###### Throws

###### Example

```javascript theme={null}
import { BLOCK_SIZE } from './crypto/SHA256/index.js';
console.log(BLOCK_SIZE); // 64
```

##### ~~create()~~

> **create**: () => `object`

Incremental hasher for streaming data

###### Returns

`object`

Hasher instance

###### ~~digest()~~

> **digest**: () => `Uint8Array`

###### Returns

`Uint8Array`

###### ~~update()~~

> **update**: (`data`) => `void`

###### Parameters

###### data

`Uint8Array`

###### Returns

`void`

###### See

[https://voltaire.tevm.sh/crypto](https://voltaire.tevm.sh/crypto) for crypto documentation

###### Since

0.0.0

###### Throws

###### Example

```javascript theme={null}
import { SHA256 } from './crypto/SHA256/index.js';
const hasher = SHA256.create();
hasher.update(new Uint8Array([1, 2, 3]));
hasher.update(new Uint8Array([4, 5, 6]));
const hash = hasher.digest();
```

##### ~~from()~~

> **from**: (`input`) => [`SHA256Hash`](../index/index.mdx#sha256hash)

Hash input with SHA256 (constructor pattern)

Auto-detects input type and hashes accordingly:

* Uint8Array: hash directly
* string starting with 0x: parse as hex
* string: UTF-8 encode then hash

###### Parameters

###### input

Data to hash

`string` | `Uint8Array`\<`ArrayBufferLike`>

###### Returns

[`SHA256Hash`](../index/index.mdx#sha256hash)

32-byte hash

###### See

[https://voltaire.tevm.sh/crypto/sha256](https://voltaire.tevm.sh/crypto/sha256) for crypto documentation

###### Since

0.0.0

###### Throws

###### Example

```javascript theme={null}
import { SHA256Hash } from './crypto/SHA256/index.js';

const hash1 = SHA256Hash.from("0x1234");      // Hex
const hash2 = SHA256Hash.from("hello");       // String
const hash3 = SHA256Hash.from(uint8array);    // Bytes
```

##### ~~fromHex()~~

> **fromHex**: (`hex`) => [`SHA256Hash`](../index/index.mdx#sha256hash) = `hashHex`

Compute SHA256 hash of hex string (without 0x prefix)

###### Parameters

###### hex

`string`

Hex string (with or without 0x prefix)

###### Returns

[`SHA256Hash`](../index/index.mdx#sha256hash)

32-byte hash

###### See

[https://voltaire.tevm.sh/crypto](https://voltaire.tevm.sh/crypto) for crypto documentation

###### Since

0.0.0

###### Throws

###### Example

```javascript theme={null}
import { SHA256 } from './crypto/SHA256/index.js';
const hash = SHA256.hashHex("0xdeadbeef");
console.log(hash.length); // 32
```

##### ~~fromString()~~

> **fromString**: (`str`) => [`SHA256Hash`](../index/index.mdx#sha256hash) = `hashString`

Compute SHA256 hash of UTF-8 string

###### Parameters

###### str

`string`

Input string

###### Returns

[`SHA256Hash`](../index/index.mdx#sha256hash)

32-byte hash

###### See

[https://voltaire.tevm.sh/crypto](https://voltaire.tevm.sh/crypto) for crypto documentation

###### Since

0.0.0

###### Throws

###### Example

```javascript theme={null}
import { SHA256 } from './crypto/SHA256/index.js';
const hash = SHA256.hashString("hello world");
console.log(hash.length); // 32
```

##### ~~hash()~~

> **hash**: (`data`) => [`SHA256Hash`](../index/index.mdx#sha256hash)

Compute SHA256 hash of input data

###### Parameters

###### data

`Uint8Array`\<`ArrayBufferLike`>

Input data as Uint8Array

###### Returns

[`SHA256Hash`](../index/index.mdx#sha256hash)

32-byte hash

###### See

[https://voltaire.tevm.sh/crypto](https://voltaire.tevm.sh/crypto) for crypto documentation

###### Since

0.0.0

###### Throws

###### Example

```javascript theme={null}
import { SHA256Hash } from './crypto/SHA256/index.js';
const hash = SHA256Hash.from(new Uint8Array([1, 2, 3]));
console.log(hash.length); // 32
```

##### ~~hashHex()~~

> **hashHex**: (`hex`) => [`SHA256Hash`](../index/index.mdx#sha256hash)

Compute SHA256 hash of hex string (without 0x prefix)

###### Parameters

###### hex

`string`

Hex string (with or without 0x prefix)

###### Returns

[`SHA256Hash`](../index/index.mdx#sha256hash)

32-byte hash

###### See

[https://voltaire.tevm.sh/crypto](https://voltaire.tevm.sh/crypto) for crypto documentation

###### Since

0.0.0

###### Throws

###### Example

```javascript theme={null}
import { SHA256 } from './crypto/SHA256/index.js';
const hash = SHA256.hashHex("0xdeadbeef");
console.log(hash.length); // 32
```

##### ~~hashString()~~

> **hashString**: (`str`) => [`SHA256Hash`](../index/index.mdx#sha256hash)

Compute SHA256 hash of UTF-8 string

###### Parameters

###### str

`string`

Input string

###### Returns

[`SHA256Hash`](../index/index.mdx#sha256hash)

32-byte hash

###### See

[https://voltaire.tevm.sh/crypto](https://voltaire.tevm.sh/crypto) for crypto documentation

###### Since

0.0.0

###### Throws

###### Example

```javascript theme={null}
import { SHA256 } from './crypto/SHA256/index.js';
const hash = SHA256.hashString("hello world");
console.log(hash.length); // 32
```

##### ~~OUTPUT\_SIZE~~

> **OUTPUT\_SIZE**: `number`

SHA256 output size in bytes (256 bits / 8)

###### See

[https://voltaire.tevm.sh/crypto](https://voltaire.tevm.sh/crypto) for crypto documentation

###### Since

0.0.0

###### Throws

###### Example

```javascript theme={null}
import { OUTPUT_SIZE } from './crypto/SHA256/index.js';
console.log(OUTPUT_SIZE); // 32
```

##### ~~toHex()~~

> **toHex**: (`hash`) => `string`

Convert hash output to hex string

###### Parameters

###### hash

`Uint8Array`\<`ArrayBufferLike`>

Hash bytes

###### Returns

`string`

Hex string with 0x prefix

###### See

[https://voltaire.tevm.sh/crypto](https://voltaire.tevm.sh/crypto) for crypto documentation

###### Since

0.0.0

###### Throws

###### Example

```javascript theme={null}
import { SHA256 } from './crypto/SHA256/index.js';
const hash = SHA256.hash(new Uint8Array([1, 2, 3]));
const hexStr = SHA256.toHex(hash);
console.log(hexStr); // "0x..."
```

#### Deprecated

Use SHA256Hash instead
SHA256 alias maintained for backward compatibility

## Functions

### create()

> **create**(): `object`

Defined in: [src/crypto/SHA256/create.js:19](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/crypto/SHA256/create.js#L19)

Incremental hasher for streaming data

#### Returns

`object`

Hasher instance

##### digest()

> **digest**: () => `Uint8Array`

###### Returns

`Uint8Array`

##### update()

> **update**: (`data`) => `void`

###### Parameters

###### data

`Uint8Array`

###### Returns

`void`

#### See

[https://voltaire.tevm.sh/crypto](https://voltaire.tevm.sh/crypto) for crypto documentation

#### Since

0.0.0

#### Throws

#### Example

```javascript theme={null}
import { SHA256 } from './crypto/SHA256/index.js';
const hasher = SHA256.create();
hasher.update(new Uint8Array([1, 2, 3]));
hasher.update(new Uint8Array([4, 5, 6]));
const hash = hasher.digest();
```

***

### from()

> **from**(`input`): [`SHA256Hash`](../index/index.mdx#sha256hash)

Defined in: [src/crypto/SHA256/from.js:27](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/crypto/SHA256/from.js#L27)

Hash input with SHA256 (constructor pattern)

Auto-detects input type and hashes accordingly:

* Uint8Array: hash directly
* string starting with 0x: parse as hex
* string: UTF-8 encode then hash

#### Parameters

##### input

Data to hash

`string` | `Uint8Array`\<`ArrayBufferLike`>

#### Returns

[`SHA256Hash`](../index/index.mdx#sha256hash)

32-byte hash

#### See

[https://voltaire.tevm.sh/crypto/sha256](https://voltaire.tevm.sh/crypto/sha256) for crypto documentation

#### Since

0.0.0

#### Throws

#### Example

```javascript theme={null}
import { SHA256Hash } from './crypto/SHA256/index.js';

const hash1 = SHA256Hash.from("0x1234");      // Hex
const hash2 = SHA256Hash.from("hello");       // String
const hash3 = SHA256Hash.from(uint8array);    // Bytes
```

***

### hash()

> **hash**(`data`): [`SHA256Hash`](../index/index.mdx#sha256hash)

Defined in: [src/crypto/SHA256/hash.js:18](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/crypto/SHA256/hash.js#L18)

Compute SHA256 hash of input data

#### Parameters

##### data

`Uint8Array`\<`ArrayBufferLike`>

Input data as Uint8Array

#### Returns

[`SHA256Hash`](../index/index.mdx#sha256hash)

32-byte hash

#### See

[https://voltaire.tevm.sh/crypto](https://voltaire.tevm.sh/crypto) for crypto documentation

#### Since

0.0.0

#### Throws

#### Example

```javascript theme={null}
import { SHA256Hash } from './crypto/SHA256/index.js';
const hash = SHA256Hash.from(new Uint8Array([1, 2, 3]));
console.log(hash.length); // 32
```

***

### hashHex()

> **hashHex**(`hex`): [`SHA256Hash`](../index/index.mdx#sha256hash)

Defined in: [src/crypto/SHA256/hashHex.js:18](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/crypto/SHA256/hashHex.js#L18)

Compute SHA256 hash of hex string (without 0x prefix)

#### Parameters

##### hex

`string`

Hex string (with or without 0x prefix)

#### Returns

[`SHA256Hash`](../index/index.mdx#sha256hash)

32-byte hash

#### See

[https://voltaire.tevm.sh/crypto](https://voltaire.tevm.sh/crypto) for crypto documentation

#### Since

0.0.0

#### Throws

#### Example

```javascript theme={null}
import { SHA256 } from './crypto/SHA256/index.js';
const hash = SHA256.hashHex("0xdeadbeef");
console.log(hash.length); // 32
```

***

### hashString()

> **hashString**(`str`): [`SHA256Hash`](../index/index.mdx#sha256hash)

Defined in: [src/crypto/SHA256/hashString.js:18](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/crypto/SHA256/hashString.js#L18)

Compute SHA256 hash of UTF-8 string

#### Parameters

##### str

`string`

Input string

#### Returns

[`SHA256Hash`](../index/index.mdx#sha256hash)

32-byte hash

#### See

[https://voltaire.tevm.sh/crypto](https://voltaire.tevm.sh/crypto) for crypto documentation

#### Since

0.0.0

#### Throws

#### Example

```javascript theme={null}
import { SHA256 } from './crypto/SHA256/index.js';
const hash = SHA256.hashString("hello world");
console.log(hash.length); // 32
```

***

### toHex()

> **toHex**(`hash`): `string`

Defined in: [src/crypto/SHA256/toHex.js:17](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/crypto/SHA256/toHex.js#L17)

Convert hash output to hex string

#### Parameters

##### hash

`Uint8Array`\<`ArrayBufferLike`>

Hash bytes

#### Returns

`string`

Hex string with 0x prefix

#### See

[https://voltaire.tevm.sh/crypto](https://voltaire.tevm.sh/crypto) for crypto documentation

#### Since

0.0.0

#### Throws

#### Example

```javascript theme={null}
import { SHA256 } from './crypto/SHA256/index.js';
const hash = SHA256.hash(new Uint8Array([1, 2, 3]));
const hexStr = SHA256.toHex(hash);
console.log(hexStr); // "0x..."
```

## References

### SHA256Hash

Re-exports [SHA256Hash](../index/index.mdx#sha256hash)