SignatureAlgorithm<T extends PublicKey> class abstract

An digital signature algorithm that supports newKeyPair(), sign(), verify().

Available algorithms

• Ecdsa.p256
• Ecdsa.p384
• Ecdsa.p521
• Ed25519
• RsaPss
• RsaSsaPkcs1v15

Example

In this example, we use Ed25519:

import 'package:cryptography/cryptography.dart';

Future<void> main() async {
  final signedMessage = 'Hello, world!';

  final ed25519 = Ed25519();
  final keyPair = await ed25519.newKeyPair();
  final signature = await ed25519.signString(
    signedMessage,
    keyPair: keyPair,
  );

  // ...

  final isRealSignature = await ed25519.verifyString(
    signedMessage,
    signature: signature,
  );

  print('Signature verification result: $isRealSignature');
}

Implementers

• DartSignatureAlgorithmMixin
• DelegatingSignatureAlgorithm
• Ecdsa
• Ed25519
• RsaPss
• RsaSsaPkcs1v15

Constructors

SignatureAlgorithm()

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

keyPairType → KeyPairType<KeyPairData, PublicKey>

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

newKeyPair() → Future<KeyPair>

Generates a new KeyPair for this algorithm.

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

Generates a new KeyPair that uses the seed bytes.

newSignatureWand() → Future<SignatureWand>

Generates a new SignatureWand that has a random KeyPair.

newSignatureWandFromKeyPair(KeyPair keyPair) → Future<SignatureWand>

Generates a new SignatureWand that uses the given KeyPair.

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

Generates a new SignatureWand that uses the given seed bytes.

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.

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

Signs a string.

toString() → String

A string representation of this object.

inherited

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

Verifies whether bytes was signed with signature.

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

Verifies whether a string was signed with signature.

Operators

operator ==(Object other) → bool

The equality operator.

inherited