Ed25519 class abstract

Ed25519 (RFC 8032) signature algorithm.

By default, DartEd25519 will be used. If you use Flutter, you can enable cryptography_flutter. It can improve performance in many cases.

Things to know

• Private key is any 32 bytes (SimpleKeyPair).
• Public key is 32 bytes (SimplePublicKey).
• Output is 32 bytes.
• RFC 8032 says that the signatures are deterministic, but some widely used implementations such as Apple CryptoKit return non-deterministic signatures.
• You can use package:jwk to encode/decode JSON Web Key (JWK) data.

Example

import 'package:cryptography/cryptography.dart';

Future<void> main() async {
  final algorithm = Ed25519();

  // Generate a key pair
  final keyPair = await algorithm.newKeyPair();

  // Sign a message
  final message = <int>[1,2,3];
  final signature = await algorithm.sign(
    message,
    keyPair: keyPair,
  );
  print('Signature bytes: ${signature.bytes}');
  print('Public key: ${signature.publicKey.bytes}');

  // Anyone can verify the signature
  final isSignatureCorrect = await algorithm.verify(
    message,
    signature: signature,
  );
}

In need of synchronous APIs?

If you need to perform operations synchronously, use DartEd25519 in package:cryptography/dart.dart.