derivekey.dart

Future<void> _deriveKey() async {

//1. Alice's public key
Map<String, dynamic> publicjwk = json.decode(
    '{"kty": "EC", "crv": "P-256", "x": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", "y": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"}');
EcdhPublicKey ecdhPublicKey =
    await EcdhPublicKey.
(publicjwk, EllipticCurve.p256);

//2. Bob's private key
Map<String, dynamic> privatejwk = json.decode(
    '{"kty": "EC", "crv": "P-256", "x": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", "y": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", "d": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"}');
EcdhPrivateKey ecdhPrivateKey =
    await EcdhPrivateKey.
(privatejwk, EllipticCurve.p256);

//3. Generating cryptokey called deriveBits
Uint8List derivedBits = await ecdhPrivateKey.deriveBits(256, ecdhPublicKey);
}