> ## 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.

# Keccak

> Auto-generated API documentation

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

***

[@tevm/voltaire](../../index.mdx) / [evm](../index.mdx) / Keccak

# Keccak

## Functions

### sha3()

> **sha3**(`frame`): [`EvmError`](../index.mdx#evmerror) | `null`

Defined in: [src/evm/keccak/0x20\_SHA3.js:25](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/evm/keccak/0x20_SHA3.js#L25)

SHA3 opcode (0x20) - Compute Keccak-256 hash

Pops offset and length from stack, reads data from memory,
computes Keccak-256 hash, and pushes the 32-byte result.

Gas cost: 30 (base) + 6 \* word\_count + memory expansion
where word\_count = ceil(length / 32)

#### Parameters

##### frame

[`BrandedFrame`](../index.mdx#brandedframe)

Frame instance

#### Returns

[`EvmError`](../index.mdx#evmerror) | `null`

Error if any