Ecdh class abstract

ECDH with P-256 / P-384 / P-521 elliptic curve.

Private keys can be instances of EcSecretKey or implementation-specific subclasses of SecretKey.

Example

import 'package:better_cryptography/better_cryptography.dart';

Future<void> main() async {
  // In this example, we use P-256 curve.
  final algorithm = Ecdh.p256();

  // Alice generates a key pair for herself.
  final aliceSecretKey = await algorithm.newSecretKey();
  final alicePublicKey = await algorithm.publicKey(aliceSecretKey);

  // Bob generates a key pair for himself.
  final bobSecretKey = await algorithm.newSecretKey();
  final bobPublicKey = await algorithm.publicKey(bobSecretKey);

  // Each party calculates shared secret.
  // Parties get the same symmetric key as a result.
  final keyForAlice = await algorithm.sharedSecretKey(
    localSecretKey: alicePublicKey,
    remotePublicKey: bobPublicKey,
  );
  final keyForBob = await algorithm.sharedSecretKey(
    localSecretKey: bobSecretKey,
    remotePublicKey: alicePublicKey,
  );
}

Inheritance

• Object
• KeyExchangeAlgorithm
• Ecdh

Implementers

• DartEcdh
• DelegatingEcdh

Constructors

Ecdh.constructor()

Constructor for classes that extend this class.

const

Ecdh.p256({required int length})

ECDH using P-256 (secp256r1 / prime256v1) elliptic curve.

factory

Ecdh.p384({required int length})

ECDH using P-384 (secp384r1 / prime384v1) elliptic curve.

factory

Ecdh.p521({required int length})

ECDH using P-521 (secp521r1 / prime521v1) elliptic curve.

factory

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<EcKeyPair>

Generates a new KeyPair for this algorithm.

override

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

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

sharedSecretKey({required KeyPair keyPair, required PublicKey remotePublicKey}) → Future<SecretKey>

Calculates a shared SecretKey.

inherited

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited