Documentation Index
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signMessage
Function Signature
Future<String> signMessage({
required String chainId,
required String message,
})
Description
Signs a personal message using the personal_sign RPC method, which prepends the standard Ethereum message prefix before signing.
Parameters
| Parameter | Type | Required | Description |
|---|
chainId | String | Yes | The chain ID in CAIP-2 format |
message | String | Yes | The message to sign (plain text or hex) |
Returns
String - The signature as a hex string.
Example
import 'package:portal_flutter/portal_flutter.dart';
final portal = Portal();
final signature = await portal.signMessage(
chainId: 'eip155:1',
message: 'Hello, Portal!',
);
print('Signature: $signature');
signTypedData
Function Signature
Future<String> signTypedData({
required String chainId,
required String typedData,
})
Description
Signs typed data according to the EIP-712 standard using the eth_signTypedData_v4 RPC method.
Parameters
| Parameter | Type | Required | Description |
|---|
chainId | String | Yes | The chain ID in CAIP-2 format |
typedData | String | Yes | The typed data as a JSON string |
Returns
String - The signature as a hex string.
Example
import 'package:portal_flutter/portal_flutter.dart';
import 'dart:convert';
final portal = Portal();
final typedData = jsonEncode({
'types': {
'EIP712Domain': [
{'name': 'name', 'type': 'string'},
{'name': 'version', 'type': 'string'},
{'name': 'chainId', 'type': 'uint256'},
],
'Message': [
{'name': 'content', 'type': 'string'},
],
},
'primaryType': 'Message',
'domain': {
'name': 'Example App',
'version': '1',
'chainId': 1,
},
'message': {
'content': 'Hello, Portal!',
},
});
final signature = await portal.signTypedData(
chainId: 'eip155:1',
typedData: typedData,
);
print('EIP-712 Signature: $signature');
Errors
| Code | Description |
|---|
NOT_INITIALIZED | Portal was not initialized |
SIGNING_FAILED | The signing operation failed |
INVALID_TYPED_DATA | The typed data JSON is invalid |
