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.

Inheritance

• Object
• SignatureAlgorithm<PublicKey>
• Ed25519

Implementers

• DartEd25519
• DelegatingEd25519

Constructors

Ed25519()

factory

Ed25519.constructor({Random? random})

Constructor for classes that extend this class.

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

keyPairType → KeyPairType<KeyPairData, PublicKey>

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

newKeyPair() → Future<SimpleKeyPair>

Generates a new KeyPair for this algorithm.

override

newKeyPairFromSeed(List<int> seed) → Future<SimpleKeyPair>

Generates a new KeyPair that uses the seed bytes.

override

newSignatureWand() → Future<SignatureWand>

Generates a new SignatureWand that has a random KeyPair.

inherited

newSignatureWandFromKeyPair(KeyPair keyPair) → Future<SignatureWand>

Generates a new SignatureWand that uses the given KeyPair.

inherited

newSignatureWandFromSeed(List<int> seed) → Future<SignatureWand>

Generates a new SignatureWand that uses the given seed bytes.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

sign(List<int> message, {required KeyPair keyPair}) → Future<Signature>

Signs bytes.

inherited

signString(String message, {required KeyPair keyPair}) → Future<Signature>

Signs a string.

inherited

toString() → String

A string representation of this object.

override

verify(List<int> message, {required Signature signature}) → Future<bool>

Verifies whether bytes was signed with signature.

inherited

verifyString(String message, {required Signature signature}) → Future<bool>

Verifies whether a string was signed with signature.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited