Ecdsa class abstract

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

For more information about ECDSA, read RFC 6090 ("Fundamental Elliptic Curve Cryptography Algorithms").

Secret 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 ECDSA-P256-SHA256
  final algorithm = Ecdsa.p256(Sha256());

  // Generate a random key pair
  final secretKey = await algorithm.newSecretKey();
  final publicKey = await algorithm.publicKey(secretKey);

  // Sign a message
  final message = <int>[1,2,3];
  final signature = await algorithm.sign(
    [1,2,3],
    secretKey: secretKey,
  );

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

Inheritance

• Object
• SignatureAlgorithm
• Ecdsa

Implementers

• DartEcdsa
• DelegatingEcdsa

Constructors

Ecdsa.constructor()

Constructor for classes that extend this class.

const

Ecdsa.p256(HashAlgorithm hashAlgorithm)

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

factory

Ecdsa.p384(HashAlgorithm hashAlgorithm)

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

factory

Ecdsa.p521(HashAlgorithm hashAlgorithm)

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

factory

Properties

hashAlgorithm → HashAlgorithm

Used hash algorithm.

no setter

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

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

Calculates signature for the message.

inherited

toString() → String

A string representation of this object.

override

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

Verifies the signature.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited