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

# rawSign

> Sign a raw message without any prefix.

## Function Signature

```dart theme={null}
Future<String> rawSign({
  required String chainId,
  required String message,
  String? signatureApprovalMemo,
})
```

## Description

Signs a raw message without adding any prefix. Unlike `signMessage`, this does not prepend the Ethereum message prefix. Use this for signing raw data or for chains that don't use Ethereum's message prefix.

## Parameters

| Parameter               | Type     | Required | Description                               |
| ----------------------- | -------- | -------- | ----------------------------------------- |
| `chainId`               | `String` | Yes      | The chain ID in CAIP-2 format             |
| `message`               | `String` | Yes      | The message to sign (must be hex-encoded) |
| `signatureApprovalMemo` | `String` | No       | Optional memo for signature approval      |

## Returns

**`String`** - The signature as a hex string.

## Example

```dart theme={null}
import 'package:portal_flutter/portal_flutter.dart';

final portal = Portal();

// Message must be hex-encoded
// "test" in hex is "74657374"
final signature = await portal.rawSign(
  chainId: 'eip155:1',
  message: '74657374',
  signatureApprovalMemo: 'Signing test message',
);

print('Raw signature: $signature');
```

## Chain-Specific Signing

The curve used for signing depends on the chain ID:

| Chain Type | Curve     |
| ---------- | --------- |
| `eip155:*` | SECP256K1 |
| `solana:*` | ED25519   |

```dart theme={null}
// SECP256K1 signing (Ethereum)
final ethSignature = await portal.rawSign(
  chainId: 'eip155:1',
  message: '74657374',
);

// ED25519 signing (Solana)
final solSignature = await portal.rawSign(
  chainId: 'solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp',
  message: '74657374',
);
```

## Errors

| Code              | Description                  |
| ----------------- | ---------------------------- |
| `NOT_INITIALIZED` | Portal was not initialized   |
| `SIGNING_FAILED`  | The signing operation failed |
| `INVALID_HEX`     | The message is not valid hex |

## Related

* [Sign a transaction guide](../guide/sign-a-transaction)
* [signMessage](./signmessage)
* [request](./request)