Generate curve25519 key-pair. Sign messages with the same key-pair by translating the point curves to do ed25519 signing.
dependencies: ... pm_curve25519: any
Important: For iOS, manually update your podfile. Go into iOS folder in terminal and execute the command:
pod install --repo-update
import 'package:pm_curve25519/pm_curve25519.dart'; import 'dart:async'; import 'dart:typed_data'; //Generate curve25519 key-pair PmKeyPair pair = await PmCurve25519.generateIdentityPair(); Uint8List publicKey = pair.publicKey; Uint8List secretKey = pair.secretKey; //on iOS, secret-key is actually an encoded object which is a key-pair. Treat it as if its a secret-key print(publicKey); //very lengthy on iOS(secret-key) print(secretKey); //Calculate signature with input Message and your secret-key String msg = "Hello World"; //Convert msg string into uint8list type Uint8List message = Uint8List.fromList(fakeMessage.codeUnits); Uint8List signature = await PmCurve25519.getSignature(message, secretKey); print(signature); //verify signature bool valid = await PmCurve25519.verifySignature(publicKey, message, signature); assert(valid);
The iOS secret-key is actually a pair itself. The pair is archived on the iOS platform native side and thus the byte array is actually very long compared to a normal 32 byte secret-key. Currently its about on average 355 bytes in output.
This shouldnt be an issue, just treat it as if its an secret-key. Might be an issue storing this key-pair(secretKey) somewhere secure.
Source of the code
I have only just created an API because I couldnt find a package that would fully allow signing a message with your original curve25519 key-pair.
I have these as my sources: