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

# util.rsaSign()

> Public low-code contract, signatures and examples for util.rsaSign.

## `util.rsaSign()`

Signs data with RSA-PSS and SHA-256 asynchronously. PEM import and input conversion can still occupy the event loop.

### Signature

```ts theme={null}
static rsaSign(
      privateKey: string,
      payload: string,
      passphrase?: string,
    ): Promise<string>;
```

### Example

```ts theme={null}
const signature = await util.rsaSign(privateKey, 'hello', passphrase);
```

See [all util methods](https://docs.revoengine.com/low-code/reference/util.md) or [runtime basics](https://docs.revoengine.com/low-code/overview.md).


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